I recently repaired one of these (289) at work where the IR LED that did the probe detection on the amps ranges had gone out. Looking on the EEVblog forums, other people have had a similar issue. Replacing the diode was easy and I appreciated the polarity marking on the PCB. Despite not having been calibrated since new, it was at most 2 counts off on all ranges. I was amazed at how much better than spec this was, with all the "normal" ranges being less than 1 count off. The low 50 ohms range gets a lot of use, many people reach for the 289 instead of any of the other meters.
This is my 'go to' multimeter at work, the AC bandwidth is excellent and apart from the slow boot-up they are reliable and accurate. We have many of these in our office and we had a problem with one of them where the current probe input detection circuit didn't work correctly. It turned out to be a problem with the IR optics that are used to detect if the socket is occupied. I did a RUclips video showing what I found and from the comments it would appear that it is not uncommon to have problems in this circuit.
I've got the same meter at work, the kickstand always falls off it. I'd also guess the inner case is transparent so they could mold the case, display cover and IR port in the one part and remove two o-rings from the BOM and some assembly steps.
We have one of these at work and I always get stuck with it. 90% of the time I prefer a simpler meter like the the 87V. The seven segment LCD has better legibility in indirect light and the fact that this 287 takes so long to boot is just annoying.
I'm much the same. I got one for cheap and don't really like it. It's crazy that this is Fluke's top of the line hand held meter when the foreign manufacturers are getting so good nowadays.
@@EEVblogI can't actually view your comment until I select 'Newest', rather than top. It seems RUclips is shadowbanning your comments on your own channel... Insane.
I own a 187 series I and it's the best of both worlds: more accurate than the 87V, dual measurements/dual displays, 7 segments, and when you turn it on... it's on! (No "booting" like the 287/289...) It's possibly second only to the 189 series I which only adds logging (and is much different from the 189 II, which the 287/289 are derived from).
@@daniloxyz I have both the 187 and 289, and the 187 is always my go-to multimeter unless I need logging (or the temperature probe that I only have in my 289 bag). Also, not having logging in the 187 means that is doesn't have a supercap that'll go bad.
Keep mentioning the "how to replace screws into plastic" comments. I often find that there are multiple paths "offered" as I reverse turn the screws where others (before me) have forced a new set of threads. I select the one the feels biggest, or I will try all paths and select the one that makes the first half-turn with the lease resistance. Keep up the good work!
I bought the 289 brother for work for the extremely low burden voltage. This is, for the moment, not used to its potential. I still love the functions. We primarily use Fluke 179's for testing and diagnose. This meter is used for those special projects to impress customers!
This is quite an old design dating back to early 2000s. I was involved in a contemporary job for them on the Fluke Biomed side and a bit of preferred tech came our way. I'm not surprised to see an MSP on the Meter side. I'm unclear about the ~28 pin Fluke chip, but recognize the LTC196x. It's a good part as long as you do your cals and understand its LF performance. What's that 6Hz lowpass? Could they not do that in firmware? I heard about a big-ass processor on the UI side which caused them pain ("all your engineer are belong to us"). But they got it done and made the product they wanted. I still like my 289. I also like my 189. I guess the transparent inner is for the IR port. The Fluke IR dongle looks weird but works fine. This was before Bluetooth took off. Fluke were very hot on electrical shielding. They have A LOT of experience across industries and use it well.
The MSP430F dates from 2002 so 20 years is about right. Freescale became NXP in 2015. But they have done corrections to the PCB - REV15. There are a LOT of small parts on that PCB which I would be itching to remove if designed now. Also the board is awash with tantalum caps that can be replaced by ceramics.
I always advise on sheet metal or plastic thread screws to reverse it until it drops into the original thread also. No sense cutting new threads that will destroy the plastic over time.
Hi EEV, nice to see You, so long from not give You notice, from Europe repair, they never repair my Fluke 289 with that problem of Loz function where show without probes connected on display, more than 8.4volts on AC voltage without any reason of course and even You know it's these 3.7 kohms between Voltage connectors of Probes. It's perfect correct about when we repositioning again the screw on plastics anywhere on devices to unscrew a little until the screw come easy on the hole and after that positioning we can insert the screw with the scredriver perfect perpendicular on screw. Nice to see You again.
It's a great meter from a resolution, precision and functionality perspective, but i find i have to use the backlight all the time to be able to see the screen clearly.........
Me too. The weird thing is that we got 60 287's at the place where I work. For such a high end meter, I expect them to be equal. But there's one meter that is definitely darker than the rest. I (of course) first thought the contrast setting was to blame, but adjusting contrast does not help and when comparing with another meter, both show up to be on the same contrast setting. Besides the boot-time (seriously, why?) I also dislike the weird extra buttons you need to press to get it to do extra function that only require a shift-press on the 187.
I’ve had mine for 9 years now, coming up on 10 in about 4 months. Still dead on with the original calibration. Has that jack detections also. I think it helps that the LCD times out and turns off after a few minutes for that 200 hours for logging battery life.
@@aspork42 Maybe it's time to check the stand-by current. High stand-by currents can indicate a problem with the goldcap/supercap in the thing that keeps track of date and time. When it starts to become defective it goes leaky (both electrically and mechanically) and starts to draw high current in stand-by mode. (I've read reports by people who mentioned a whopping 36 mA when in standby).
The 287 is indeed a very pretty meter, especially on the inside, but it ought to be for the retail price it has. You indeed get extra quality for the considerable extra money. I still have and use daily the Fluke 8060A which I bought back in 1983. It went back to Fluke in the late 1980s for an LCD board update and calibration. I just checked the calibration against my 6.5 digit Keysight bench meter and the Fluke is still spot on. I am not sure I would still trust the 41 year old plastic of the 8060A for high voltage withstand, but I rarely deal with any voltage greater than 240 volt mains.
The tilt stand indeed is kinda crappy and could've been better. I just rest the meter against a surface. I'm surprised you didn't take the front panel off or talked about the optical jack sensing. The case is actually transparent and the grey frontpanel is what makes it either a 287 or 289. The 287 front panel limits the movement of the range switch as the 289 has two extra positions. Of course the firmware is different. But other than the front panel and insert surrounding the lcd, the cases are identical.
I was lucky and got a new 289 for pennies, ladies husband died and not long had it and she sold it to me for the price of a cheap multimeter. I did try to tell her it’s worth a lot but she let me have it for pennies in the end. Great meter and my go to meter.
You kept missing the LT2415-1 24bit ADC (to the left and just above the MSP430 in the schematic). Also, the voltage reference is not the LM4041 but U42, a 2.5V LTC6652 (last page of schematics). At first sight the ADC reference inputs look to be wrong with Ref+ connected to AGND and Ref- to AVSS (cct gnd) - until you realise that AGND is actually driven to the 2.5V reference voltage relative to AVSS. Also confusing at first sight is that the LTC2415-1 +Vin is connected to reference +ve (AGND) and the input signal is fed into V-. However the ADC has a differential input so it's not a problem.
Great catch, but actually the schematic and layout show U42 (LTC6652) double-footprinted (in parallel) with U15 (LT1019). On the actual device pcb, U42 is not populated and U15 is populated. U15's part marking "19A125" matches LT1019AIS8-2.5 specified in datasheet with a rated 10ppm/C tcr.
I repaired a few of the 289's with high voltage AC abuse in industrial test cage (likely about 4 kV 50 Hz) due to user error. Why did the management chose to use a fine instrument like that to test basic voltages in a cage baffles me. Opportunity for me to get them cheap. I had 3 of those at one point - sold one. Putting one back together I forgot to tighten the screws and wasted quite some time finding the culprit. Once tightened I have not had problems over the years. 289 has two PTCs. Upstream there is the transistor clamp array protecting the very input to the ADC. In one of the 289's a cople of the transistors were damaged. The input protection is battle tested - in one of the meters the big input resistor had blown to pieces so violently that part of the inner case was evaporated (the clear part). Replaced the MOVs, PTCs and resistors and it was fine. GOAT meter!
C145 probably doesn't have a replacement. From the research i did on my Fluke 189 (on your forum), it's there just to store your memory when batter power isn't present. Many other 189 owners have, and suggest, removing the super cap entirely so it doesn't leak out and ruin the board. I've had mine removed for several months now and use my meter every day at work with no issues.
The clear plastic casing under the rubber is a genius touch: you can have a display port that is totally waterproof without any kind of joint with the casing itself… Would the loktite interfere with the conductivity? I do think so…
A thing of beauty indeed. I wonder if these ethernet jacks were ever a feature of any model, or if they were there as a production-time only interface. It shouldn't be that hard for Fluke to release an upgraded battery compartment and stand. It's one of the higher end meters after all...
@@mattmurphy7030 You don't want 1KV in the meter to leak into ethernet. That's why good meters always have wireless of some sort for data logging, IE IR in this.
The transparent case appears to be Ultem plastic. Ultem is very resistant to heat. It's transparent only as a default attribute of Ultem. No functional reason for transparency.
Oh a teardown with the full Schematic! Now THIS I like! MORE (please)!!! After b!tching about Flukes being overpriced, i can now see they ARE kinda Class - at a good used price, of course ;)
Have owned one for 10 years. My only wish would be Fluke updating the display for better viewing. Ditch the backlight and go to a OLED display for my tired old eyes.
At my workplace, power electronics designer in EV, I have a bunch of Flukes with rechargable batteries. They have a dedicated charger which plugs into the bananna plugs. I don't remember exactly which of them, usually it's written on the front.
If some schmoo interferes with the IR-lead-sense, use compressed air to clean it. Chemicals can stain the plastic & the IR-emitter-lens, making the DMM think there's always a probe in the ammeter-hole.
I know what an ENET2 and ENET3 are. They are terminals used to connect certain Fluke Multimeters to lithium plasma solar panels attached to the backpacks of school children in the Netherlands. These panels, designed by native Americans to look like a porpoise dorsal fin, captures the Sun's energy and stores it directly into our children as they walk to school. By building schools next door to Green Energy Distribution Communes (GEDC), the kiddies become living 'batteries' that shares power with the GEDC. The special ENET connectors are required because the power GEDC power is so emotionally pure. We learned some years ago from Whitney Houston that "Children are our future", now we know that she meant that "Children are our Energy future".
I've got two 289's here. Fits my needs just fine. The only things i don't like about em, is the screen isn't always easy to read, and how fast they chew through those 6 x AA batteries.
Change the supercapacitor, and your batteries will last 3x longer. You can tell it is bad if it loses the date/time when the batteries are disconnected for a couple of minutes. I also use two AA-sized 3.7V Li-Ion rechargeable batteries with three dummy cells.
I have 2 289's also. I bough one for my Father who has since passed on, so I got his back. They look practically brand new and his still has the protective plastic sheet on the display window. I agree about battery life... that is the BIGGEST complaint about these meters.. and the super cap going short. What I would like to know is where can I find the schematic?
I don't know if I want a multimeter like that (because of its features AND that datalogging is useful) or not (the battery consumption thing, that bootup time and that plain garbage stand) but if one of those comes by cheap I would. Lightyears ahead of the Aneng I got!
@@EEVblog Shame in the country I'm in (the freaking Philippines), it will be a miracle for a package to get to me without paying atrocious fees. I can only dream...
Was a bit of a surprise to see an Intel module in there. I was aware that they made nand flash chips, I have an old sata ssd from them, but I figured that other manufacturers would have been preferred by Fluke.
My daily meter for the last 12 years is a 289. Good but...battery life is terrible. Boot up time is irritating. 87 is usually better. But, i do like the Min Max avg all on the screen at the same time with the current value. Very useful. So, i keep using it.
That was bugging me also, followed the trace from the XBT2 pad to R77 on the board, in the schematics that is connected to the debug pin on the processor. So, probably only used at the factory, not for a different battery pack.
I have a 289 and the tilting thingy is more a breaking thingy...annoying...plus if it drops a bit to hard the photo diode at the amp inlet tumbles off the pcb. It's very tiny but you can solder it.
When will the next generation be released? Meaning Fluke 389 to follow the 289 which followed the 189. The 289 has been sold for over 20 years - how long was the 189 sold for by comparison? Improvements for next generation (389?):- -Make that near useless rear stand stonger and stop it falling off -OLED display -Battery life improvement OR Rechargeable Li-Poly battery pack (with Wireless Charging like a Mobile Phone) that fits in place of AA Alkaline battery holder -Faster boot up time
The first plastic is to allow the IR interface and maintain a single piece for sealing. If they used a separate window it could develop leaks over time.
Could you explain the LOW Z and LOW V modes of the 289, I know what the manual says, but you have such a better understanding of these inner workings I would appreciate it.
I do know what LOW Z and LOW v are, also not just for a capacitive coupled voltage but for unloaded circuits that don’t drop voltage. I’m asking for an insider look of how it changes the meter design and the implementation of it schematically. Appreciate the reply.
is there any serial eprom? in meter information is fields that by default say 'Use Fluke ViewForms to edit fields' .. it is for setting Company name, Site name, Contact information. As a private user, I can't justify FVF, and they told me its the only way.. I wonder if I can set it manually if its in an eprom. but I guess its in the flash?
Loctite works as an insulator, not really optimal for the input jacks. Did some work for the military and using loctite on the screws for the earth cable was a no go, never seen so much paperwork with instructions on how to mount a single screw.
Got 2 289 and a 189. Brilliant meters. 289 does get annoying waiting for it to boot compared to the 189. Fluke Forms and dumping trend data to it is really good too.
Buenos días mi fluke 289 al encender el contraste de pantalla es oscura y cuando le doy a regular el contrastes más es el lado contraste alto q el de bajo contrastes q puede ser ya q acá en Perú la empresa q distribuye estoy equipos no los arreglan si la compra no se hizo en sus tiendas
Recently score 289 for 300$)) Disadvantages: 1) Big and havy. 2) Tilding bay. 3) Start up time is not bad but usually when you use multimeter preferred scheme switch and go in fluke 28x case is switch wait and go. 4) Strange software solution at resistance mode they dedicated F3 button to switch between continuity and resistance mode ok it need, but in capacity and diode you need messing with menu F3 button doesn't used. 5) Doesn't remember las used mode after switch rotation. 6) Expensive Ir cable I made myself for 5~10$. 7) other minor thing like price, battery consumption, leaking ionistor, not so crisp display. Overall is good multimeter with lot of good features but are it the best is opened questions.
I never have expected a damn multimeter to have 2 cpus. First of all the msp430, pretty awesome chip no complaints at all! But secondly you got a full blown Arm cpu for the UI and stuff and even ethernet port layouts, thats crazy! Also because that freescale jobby is 100% running Embedded Linux which in itself is fine, although the boot time is too long. A multimeter has to turn on in max 3 seconds and most of them do because its just a mcu, this one breaks those rules and boots a full blown os and UI app. No thanks id rather stick with my regular multimeter which does have a lot of features but not all the bells and whistles this one has and also it boots in 2 seconds. Also imo an Arm cpu with full embedded linux is too overpowered for a non color display also
Just had a question. How would you know that the input resistor is fusable? My understanding is that a fusable resistor has a white band before the tolerance band.
I'm convinced nobody makes a good multimeter kickstand. It's actually the only thing I don't like about my BM235 meter, too. The floppy kickstand attachment area drives me nuts.
in reference to my earlier post I just want to know why use self tapping screws , to me that is not quality , that just says can`t be bothered to use metal inserts or we don`t care if the screw gets cross threaded , blow a fuse unscrew back , replace battery and again play with screws The multimeter I bought from Radio Shack back in early 1982 has metal inserts Fluke isn`t the only one I`ve seen Dave here do tear down/ review of other meters same thing self tapping ....Just Why Is it to save a buck
That C145 supercap is just too bad! Rusty on every Fluke 28x, eventually malfunctioning and drawning the batteries and unable to keep date and time at all.
Looks like the 287 supercap (made by Elna) is EOL'd - anyone know if there is an equivalent? I looked at mine and its leaking too :(. Had no idea until I saw this video :).
Purchased a brand new 289 FVF on ebay for a reasonable price. Found out that the included USB-adapter had a production-fail known to Fluke. Applied for a swap to which Fluke confirmed as my unit was affected. I then send them the defective cable. Fluke then suddenly changed their stand-point and denied to swap the cable because I had purchased the product from what appears to be a liquidation seller and not thru a Fluke-blessed-supply-chain. 🙄 Fluke could easily verify the original reseller via the serial number ( if they worried about the unit being stolen ) but instead they just turned me down. 👎 I own several Fluke Products the most expensive being a 196 scopemeter, but I will never buy a Fluke product again.
Especially considering he made a video a little while ago on these bots at the time this video releases, no less. Reporting doesn't work considering new ones are going to be created anyway. How much longer will these be a problem until RUclips wakes up and does something about them by banning them and preventing new ones from being created (and also adding new/stricter guidelines regarding channels' profile pictures, banners, and whatever websites they link to)
"Worth every cent from a design and build quality POV", and yet you had to tech us how to screw self-tappers into plastic. I am surprised, they did not put self-tappers on terminals' posts.
Re: that clear inner skeleton: I'll bet it's polycarbonate, designed to give the ABS outer shell some beefy impact resistance. Seems odd, because usually the protective case goes on the outside. Perhaps Fluke cannot get BASF PC in the trademarked yellow color they need.
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
I recently repaired one of these (289) at work where the IR LED that did the probe detection on the amps ranges had gone out. Looking on the EEVblog forums, other people have had a similar issue. Replacing the diode was easy and I appreciated the polarity marking on the PCB. Despite not having been calibrated since new, it was at most 2 counts off on all ranges. I was amazed at how much better than spec this was, with all the "normal" ranges being less than 1 count off.
The low 50 ohms range gets a lot of use, many people reach for the 289 instead of any of the other meters.
What are they using the low ohms range for mostly?
This is my 'go to' multimeter at work, the AC bandwidth is excellent and apart from the slow boot-up they are reliable and accurate. We have many of these in our office and we had a problem with one of them where the current probe input detection circuit didn't work correctly. It turned out to be a problem with the IR optics that are used to detect if the socket is occupied. I did a RUclips video showing what I found and from the comments it would appear that it is not uncommon to have problems in this circuit.
I've got the same meter at work, the kickstand always falls off it.
I'd also guess the inner case is transparent so they could mold the case, display cover and IR port in the one part and remove two o-rings from the BOM and some assembly steps.
Quite likely.
Same, I use the same one on streams, and yeah, that kickstand falls off.
I have the 289 and the stand is crap. It doesn't even snap close correctly, including in this video. I thought I was the only one
Magnet strap attachment for the win
The clear plastic case is so that the IR port works without needing a cut-out in the case.
Input probe optical detection as well.
I think I first heard about doing a quick counter-clockwise turn on the self tapping screws from Franlab. Definitely been making sure to do it since!
We have one of these at work and I always get stuck with it. 90% of the time I prefer a simpler meter like the the 87V. The seven segment LCD has better legibility in indirect light and the fact that this 287 takes so long to boot is just annoying.
I'm much the same. I got one for cheap and don't really like it. It's crazy that this is Fluke's top of the line hand held meter when the foreign manufacturers are getting so good nowadays.
Yes, this would be complete overkill for most jobs.
@@EEVblogI can't actually view your comment until I select 'Newest', rather than top. It seems RUclips is shadowbanning your comments on your own channel... Insane.
I own a 187 series I and it's the best of both worlds: more accurate than the 87V, dual measurements/dual displays, 7 segments, and when you turn it on... it's on! (No "booting" like the 287/289...)
It's possibly second only to the 189 series I which only adds logging (and is much different from the 189 II, which the 287/289 are derived from).
@@daniloxyz I have both the 187 and 289, and the 187 is always my go-to multimeter unless I need logging (or the temperature probe that I only have in my 289 bag). Also, not having logging in the 187 means that is doesn't have a supercap that'll go bad.
bought one of these in 2009, new, for 285usd on ebay and it still works great. I've been really happy with this multimeter
yes that tilt stand is crap. this is the most annoying thing on my 289. plus the "supercrap" that needs replacing
Keep mentioning the "how to replace screws into plastic" comments. I often find that there are multiple paths "offered" as I reverse turn the screws where others (before me) have forced a new set of threads. I select the one the feels biggest, or I will try all paths and select the one that makes the first half-turn with the lease resistance. Keep up the good work!
Glad that getting that service manual by luck was helpful in one of your videos - BlackPhoenix from the EEVBlog Forum here.
Nice work, thanks!
I bought the 289 brother for work for the extremely low burden voltage. This is, for the moment, not used to its potential. I still love the functions. We primarily use Fluke 179's for testing and diagnose. This meter is used for those special projects to impress customers!
❤
This is quite an old design dating back to early 2000s. I was involved in a contemporary job for them on the Fluke Biomed side and a bit of preferred tech came our way. I'm not surprised to see an MSP on the Meter side. I'm unclear about the ~28 pin Fluke chip, but recognize the LTC196x. It's a good part as long as you do your cals and understand its LF performance. What's that 6Hz lowpass? Could they not do that in firmware? I heard about a big-ass processor on the UI side which caused them pain ("all your engineer are belong to us"). But they got it done and made the product they wanted. I still like my 289. I also like my 189.
I guess the transparent inner is for the IR port. The Fluke IR dongle looks weird but works fine. This was before Bluetooth took off.
Fluke were very hot on electrical shielding. They have A LOT of experience across industries and use it well.
The MSP430F dates from 2002 so 20 years is about right. Freescale became NXP in 2015. But they have done corrections to the PCB - REV15. There are a LOT of small parts on that PCB which I would be itching to remove if designed now. Also the board is awash with tantalum caps that can be replaced by ceramics.
For my line of work I love the magnetic clip on adapters as it makes it handy for switchboard applications to take measurements for a period of time.
I always advise on sheet metal or plastic thread screws to reverse it until it drops into the original thread also. No sense cutting new threads that will destroy the plastic over time.
Good trick
It is a good technique for ANY screws.
16:30 I learned this technique 30 years ago after bodging a couple plastic screw holes. ❤
Hi EEV, nice to see You, so long from not give You notice, from Europe repair, they never repair my Fluke 289 with that problem of Loz function where show without probes connected on display, more than 8.4volts on AC voltage without any reason of course and even You know it's these 3.7 kohms between Voltage connectors of Probes. It's perfect correct about when we repositioning again the screw on plastics anywhere on devices to unscrew a little until the screw come easy on the hole and after that positioning we can insert the screw with the scredriver perfect perpendicular on screw. Nice to see You again.
It's a great meter from a resolution, precision and functionality perspective, but i find i have to use the backlight all the time to be able to see the screen clearly.........
👍
Me too. The weird thing is that we got 60 287's at the place where I work. For such a high end meter, I expect them to be equal. But there's one meter that is definitely darker than the rest. I (of course) first thought the contrast setting was to blame, but adjusting contrast does not help and when comparing with another meter, both show up to be on the same contrast setting.
Besides the boot-time (seriously, why?) I also dislike the weird extra buttons you need to press to get it to do extra function that only require a shift-press on the 187.
Very nice video i am using fluke since 1987 8060A. Model still working condition
I’ve had mine for 9 years now, coming up on 10 in about 4 months. Still dead on with the original calibration. Has that jack detections also. I think it helps that the LCD times out and turns off after a few minutes for that 200 hours for logging battery life.
I have had one for well over a decade. Best meter ive ever bought. I just use the magnetic hanger instead of kickstand.
Great meter, been using them for years, main downside is they can eat batteries when used daily
❤
same! mine uses them up like nothing and i barely use it.
@@aspork42 Maybe it's time to check the stand-by current. High stand-by currents can indicate a problem with the goldcap/supercap in the thing that keeps track of date and time. When it starts to become defective it goes leaky (both electrically and mechanically) and starts to draw high current in stand-by mode. (I've read reports by people who mentioned a whopping 36 mA when in standby).
The 287 is indeed a very pretty meter, especially on the inside, but it ought to be for the retail price it has. You indeed get extra quality for the considerable extra money. I still have and use daily the Fluke 8060A which I bought back in 1983. It went back to Fluke in the late 1980s for an LCD board update and calibration. I just checked the calibration against my 6.5 digit Keysight bench meter and the Fluke is still spot on. I am not sure I would still trust the 41 year old plastic of the 8060A for high voltage withstand, but I rarely deal with any voltage greater than 240 volt mains.
Nothing flapping in the breeze?
Nothing how you doing?
Nothing to play along with at home?
What an earth is going on Dave ????
It's 2024 ?
The tilt stand indeed is kinda crappy and could've been better. I just rest the meter against a surface.
I'm surprised you didn't take the front panel off or talked about the optical jack sensing. The case is actually transparent and the grey frontpanel is what makes it either a 287 or 289. The 287 front panel limits the movement of the range switch as the 289 has two extra positions. Of course the firmware is different. But other than the front panel and insert surrounding the lcd, the cases are identical.
Great teardown. It's an amazing DMM, almost as good as my Aneng AN870.
AN8009 for my DIY hobby.
I was lucky and got a new 289 for pennies, ladies husband died and not long had it and she sold it to me for the price of a cheap multimeter. I did try to tell her it’s worth a lot but she let me have it for pennies in the end. Great meter and my go to meter.
You kept missing the LT2415-1 24bit ADC (to the left and just above the MSP430 in the schematic). Also, the voltage reference is not the LM4041 but U42, a 2.5V LTC6652 (last page of schematics).
At first sight the ADC reference inputs look to be wrong with Ref+ connected to AGND and Ref- to AVSS (cct gnd) - until you realise that AGND is actually driven to the 2.5V reference voltage relative to AVSS. Also confusing at first sight is that the LTC2415-1 +Vin is connected to reference +ve (AGND) and the input signal is fed into V-. However the ADC has a differential input so it's not a problem.
Great catch, but actually the schematic and layout show U42 (LTC6652) double-footprinted (in parallel) with U15 (LT1019).
On the actual device pcb, U42 is not populated and U15 is populated. U15's part marking "19A125" matches LT1019AIS8-2.5 specified in datasheet with a rated 10ppm/C tcr.
I repaired a few of the 289's with high voltage AC abuse in industrial test cage (likely about 4 kV 50 Hz) due to user error.
Why did the management chose to use a fine instrument like that to test basic voltages in a cage baffles me.
Opportunity for me to get them cheap. I had 3 of those at one point - sold one.
Putting one back together I forgot to tighten the screws and wasted quite some time finding the culprit. Once tightened I have not had problems over the years.
289 has two PTCs.
Upstream there is the transistor clamp array protecting the very input to the ADC. In one of the 289's a cople of the transistors were damaged.
The input protection is battle tested - in one of the meters the big input resistor had blown to pieces so violently that part of the inner case was evaporated (the clear part).
Replaced the MOVs, PTCs and resistors and it was fine.
GOAT meter!
Dave is really good a circuit board analysis. the guy hasn't worked in commercial design is years, how does he keep up
Clear plastic might be polycarbonate for higher impact resistance with the standard PA6 plastic over-moulding. Also provides the IR LED window.
C145 probably doesn't have a replacement. From the research i did on my Fluke 189 (on your forum), it's there just to store your memory when batter power isn't present. Many other 189 owners have, and suggest, removing the super cap entirely so it doesn't leak out and ruin the board. I've had mine removed for several months now and use my meter every day at work with no issues.
Bob is your uncle 😅 I love this guy and his educational shows❤
The first multi-meter teardown of the year.
The clear plastic casing under the rubber is a genius touch: you can have a display port that is totally waterproof without any kind of joint with the casing itself…
Would the loktite interfere with the conductivity? I do think so…
The rusty capacitor is a known issue for fluke 289 and 287
Jesus that's ridiculous and especially more so at that price point.
@@yeet1337 IIRC, it was revised in later units. I think mjlorton addressed it in one of his videos.
A thing of beauty indeed. I wonder if these ethernet jacks were ever a feature of any model, or if they were there as a production-time only interface.
It shouldn't be that hard for Fluke to release an upgraded battery compartment and stand. It's one of the higher end meters after all...
Says development only on the schematic. Doesn't make sense on a production model from a safety standpoint.
@@EEVblogwhy is it a safety concern?
@@mattmurphy7030 You don't want 1KV in the meter to leak into ethernet. That's why good meters always have wireless of some sort for data logging, IE IR in this.
Sad to hear right away that the stand just pops right off, given how much Fluke meters cost
👍
The transparent case appears to be Ultem plastic. Ultem is very resistant to heat. It's transparent only as a default attribute of Ultem. No functional reason for transparency.
Oh a teardown with the full Schematic! Now THIS I like! MORE (please)!!!
After b!tching about Flukes being overpriced, i can now see they ARE kinda Class - at a good used price, of course ;)
Hey Dave, you mention the miliamp jack (13:55), it's actually the IR port. Cheers, Stu
Nope, it's the mA jack. It's optical and it says so on the net as well.
Have owned one for 10 years. My only wish would be Fluke updating the display for better viewing. Ditch the backlight and go to a OLED display for my tired old eyes.
... and external power supply!
At my workplace, power electronics designer in EV, I have a bunch of Flukes with rechargable batteries. They have a dedicated charger which plugs into the bananna plugs. I don't remember exactly which of them, usually it's written on the front.
Thanks, love my 289.
❤
If some schmoo interferes with the IR-lead-sense, use compressed air to clean it. Chemicals can stain the plastic & the IR-emitter-lens, making the DMM think there's always a probe in the ammeter-hole.
I know what an ENET2 and ENET3 are.
They are terminals used to connect certain Fluke Multimeters to lithium plasma solar panels attached to the backpacks of school children in the Netherlands. These panels, designed by native Americans to look like a porpoise dorsal fin, captures the Sun's energy and stores it directly into our children as they walk to school. By building schools next door to Green Energy Distribution Communes (GEDC), the kiddies become living 'batteries' that shares power with the GEDC. The special ENET connectors are required because the power GEDC power is so emotionally pure.
We learned some years ago from Whitney Houston that "Children are our future", now we know that she meant that "Children are our Energy future".
I've got two 289's here. Fits my needs just fine.
The only things i don't like about em, is the screen isn't always easy to read, and how fast they chew through those 6 x AA batteries.
Change the supercapacitor, and your batteries will last 3x longer.
You can tell it is bad if it loses the date/time when the batteries are disconnected for a couple of minutes.
I also use two AA-sized 3.7V Li-Ion rechargeable batteries with three dummy cells.
I have 2 289's also. I bough one for my Father who has since passed on, so I got his back.
They look practically brand new and his still has the protective plastic sheet on the display window.
I agree about battery life... that is the BIGGEST complaint about these meters.. and the super cap going short.
What I would like to know is where can I find the schematic?
I don't know if I want a multimeter like that (because of its features AND that datalogging is useful) or not (the battery consumption thing, that bootup time and that plain garbage stand) but if one of those comes by cheap I would. Lightyears ahead of the Aneng I got!
Put on an ebay alert watch list.
@@EEVblog Shame in the country I'm in (the freaking Philippines), it will be a miracle for a package to get to me without paying atrocious fees. I can only dream...
Was a bit of a surprise to see an Intel module in there. I was aware that they made nand flash chips, I have an old sata ssd from them, but I figured that other manufacturers would have been preferred by Fluke.
Я в своём 289 заменил supercap на EECS0HD224H. Заводской был в таком же состоянии как на видео.
My daily meter for the last 12 years is a 289. Good but...battery life is terrible. Boot up time is irritating. 87 is usually better.
But, i do like the Min Max avg all on the screen at the same time with the current value. Very useful. So, i keep using it.
Damn, i thought for aure the 3rd terminal would get more treatment. Left me hanging 😢
That was bugging me also, followed the trace from the XBT2 pad to R77 on the board, in the schematics that is connected to the debug pin on the processor.
So, probably only used at the factory, not for a different battery pack.
@@MartysRandomStuff I just checked my ~5 year old 289 and it does not have that third pad or contact on the battery holder
Clear plastic is probably stronger due to lack of filler for colouring.
Dad used to have something like that! He was an electrical engineer 👍
I have a 289 and the tilting thingy is more a breaking thingy...annoying...plus if it drops a bit to hard the photo diode at the amp inlet tumbles off the pcb. It's very tiny but you can solder it.
Every time I hear someone say "decade old" the first thing I think of is 80s technology
😂
When will the next generation be released? Meaning Fluke 389 to follow the 289 which followed the 189.
The 289 has been sold for over 20 years - how long was the 189 sold for by comparison?
Improvements for next generation (389?):-
-Make that near useless rear stand stonger and stop it falling off
-OLED display
-Battery life improvement OR Rechargeable Li-Poly battery pack (with Wireless Charging like a Mobile Phone) that fits in place of AA Alkaline battery holder
-Faster boot up time
The first plastic is to allow the IR interface and maintain a single piece for sealing. If they used a separate window it could develop leaks over time.
Could you explain the LOW Z and LOW V modes of the 289, I know what the manual says, but you have such a better understanding of these inner workings I would appreciate it.
Low Z, is low input impedance to remove capacitively coupled voltages from the reading. Most meters have 10MΩ impedance, LoZ is generally a few KΩ.
I do know what LOW Z and LOW v are, also not just for a capacitive coupled voltage but for unloaded circuits that don’t drop voltage. I’m asking for an insider look of how it changes the meter design and the implementation of it schematically. Appreciate the reply.
@@waynecostanza2280 It's basically a PTC resistor of a few Kohm across the input. The rest of the ADC path is the same as normal volts.
I have a 289 at home. The kickstand is crap. Would also have liked to see an option for external power brick because it eats batteries for breakfast.
I assume they made it clear so that it was one single part and they didn't need a separate part for the IR window?
I have a feeling that it was a styling cue. Some people prefer transparent cases as they like to see what's inside the unit.
hello dave love your channel did you ever get the part from Germany for that gun ?
Those ethernet headers are external MII interfaces to an external PHY. Interesting.
Terminal screw @7:49 is already loose. Unless you previously loosened it off camera.
Yeah, previous take I restarted.
Cool a fluke teardown right on.
is there any serial eprom? in meter information is fields that by default say 'Use Fluke ViewForms to edit fields' .. it is for setting Company name, Site name, Contact information. As a private user, I can't justify FVF, and they told me its the only way.. I wonder if I can set it manually if its in an eprom. but I guess its in the flash?
Loctite works as an insulator, not really optimal for the input jacks.
Did some work for the military and using loctite on the screws for the earth cable was a no go, never seen so much paperwork with instructions on how to mount a single screw.
Doesn't seem like that would be much concern in this case given how the jacks are designed.
Now if the 287 and 289 weren't so big and heavy, I might drag out mine more often.
Thank you 🙏
My company had things in a kit with a Bluetooth module and you can set the real time graph up on your phone or computer
Got 2 289 and a 189. Brilliant meters. 289 does get annoying waiting for it to boot compared to the 189. Fluke Forms and dumping trend data to it is really good too.
Brasil. Tenho um multímetro desse modelo, porém não acende o display. Gostaria de saber onde encontro esse esquema eletrico desse multímetro
Buenos días mi fluke 289 al encender el contraste de pantalla es oscura y cuando le doy a regular el contrastes más es el lado contraste alto q el de bajo contrastes q puede ser ya q acá en Perú la empresa q distribuye estoy equipos no los arreglan si la compra no se hizo en sus tiendas
Awesome review!! Where can I get that schematic diagram?
Nice meter,looks repairable,which is nice, as you say you can get a new LCD display for it.
Is loctite a non-conductive risk?
ENET1 and ENET2 have the correct pin counts for an RMII ethernet interface.
The white range switch reminds me of a 45 to 33 rpm adapter. Dating myself!
Recently score 289 for 300$))
Disadvantages:
1) Big and havy.
2) Tilding bay.
3) Start up time is not bad but usually when you use multimeter preferred scheme switch and go in fluke 28x case is switch wait and go.
4) Strange software solution at resistance mode they dedicated F3 button to switch between continuity and resistance mode ok it need, but in capacity and diode you need messing with menu F3 button doesn't used.
5) Doesn't remember las used mode after switch rotation.
6) Expensive Ir cable I made myself for 5~10$.
7) other minor thing like price, battery consumption, leaking ionistor, not so crisp display.
Overall is good multimeter with lot of good features but are it the best is opened questions.
I never have expected a damn multimeter to have 2 cpus. First of all the msp430, pretty awesome chip no complaints at all! But secondly you got a full blown Arm cpu for the UI and stuff and even ethernet port layouts, thats crazy! Also because that freescale jobby is 100% running Embedded Linux which in itself is fine, although the boot time is too long. A multimeter has to turn on in max 3 seconds and most of them do because its just a mcu, this one breaks those rules and boots a full blown os and UI app.
No thanks id rather stick with my regular multimeter which does have a lot of features but not all the bells and whistles this one has and also it boots in 2 seconds.
Also imo an Arm cpu with full embedded linux is too overpowered for a non color display also
It makes me wonder how you guys get access to schematic?
Just had a question. How would you know that the input resistor is fusable? My understanding is that a fusable resistor has a white band before the tolerance band.
Fluke ones traditionally are. But just a guess.
4:02 Can I assume the plastic shielding is *conductive* to help block electromagnetic interference ?
It seems every high voltage technician has one of these. I've never seen one get used for anything that you couldn't do with a basic multimeter.
everything screams quality cept self tapping screws Just why?
I'm convinced nobody makes a good multimeter kickstand. It's actually the only thing I don't like about my BM235 meter, too. The floppy kickstand attachment area drives me nuts.
Yeah, the BM235 could certainly have a better stand.
in reference to my earlier post I just want to know why use self tapping screws , to me that is not quality , that just says can`t be bothered to use metal inserts or we don`t care if the screw gets cross threaded , blow a fuse unscrew back , replace battery and again play with screws
The multimeter I bought from Radio Shack back in early 1982 has metal inserts
Fluke isn`t the only one I`ve seen Dave here do tear down/ review of other meters same thing self tapping ....Just Why Is it to save a buck
Wow, is that an Intel flash chip? Haven't seen one of those in years!😂
Buenas tardes saludos de Perú tengo un fluke 289 y el contraste está fallando por q no quiere aclararse la pantalla está un poco oscura
I wonder if the reading at the beginning was from radio waves.
E net, Ethernet 1 and 2?
schematic link pleaseeeeeee
Excelente 😊
Doesn't the screen turn off in long-term logging mode?
Yes.. ( I've got 289)
That C145 supercap is just too bad! Rusty on every Fluke 28x, eventually malfunctioning and drawning the batteries and unable to keep date and time at all.
Looks like the 287 supercap (made by Elna) is EOL'd - anyone know if there is an equivalent? I looked at mine and its leaking too :(. Had no idea until I saw this video :).
You can just remove it if you don't mind losing the time and date every time you replace batteries. Could also bodge in a modern supercap.
digikey #rscsk2043r3d01004t
Did you try the Linus tech tips screw thing?
Purchased a brand new 289 FVF on ebay for a reasonable price.
Found out that the included USB-adapter had a production-fail known to Fluke.
Applied for a swap to which Fluke confirmed as my unit was affected. I then send them the defective cable.
Fluke then suddenly changed their stand-point and denied to swap the cable because I had purchased the product from what appears to be a liquidation seller and not thru a Fluke-blessed-supply-chain. 🙄
Fluke could easily verify the original reseller via the serial number ( if they worried about the unit being stolen ) but instead they just turned me down. 👎
I own several Fluke Products the most expensive being a 196 scopemeter, but I will never buy a Fluke product again.
Fenomenal!!
The pr0n bots are at it again, seconds after upload!
Especially considering he made a video a little while ago on these bots at the time this video releases, no less.
Reporting doesn't work considering new ones are going to be created anyway.
How much longer will these be a problem until RUclips wakes up and does something about them by banning them and preventing new ones from being created (and also adding new/stricter guidelines regarding channels' profile pictures, banners, and whatever websites they link to)
"Worth every cent from a design and build quality POV", and yet you had to tech us how to screw self-tappers into plastic. I am surprised, they did not put self-tappers on terminals' posts.
Re: that clear inner skeleton: I'll bet it's polycarbonate, designed to give the ABS outer shell some beefy impact resistance. Seems odd, because usually the protective case goes on the outside. Perhaps Fluke cannot get BASF PC in the trademarked yellow color they need.