When you checked the bug zapper, I wondered if the output was around the supply frequency or if they upped he frequency ? The specs refer to 50/60 Hz. I wonder how it performs at high frequencies. CRT Drive circuits used to work at 15.625 kHz on the AC side and produce up to 25 kV on color TV sets. Keep frequency in mind as this could be an issue with the probe.
Yes, good point. HV probes like this one and the Fluke 80K40 are no go at measuring high frequency AC. There are special HV oscilloscope probes that are used for those specific applications (very pricy) 🙂 These things work best for HV DC and of course nominal line voltage frequencies. Also the DDM will play a roll in that as it would have to be true RMS (which the 17B is not), and most true RMS meters that I've played around with over the years start dropping AC voltage accuracy over 1kHz but I know it all depends on the meter and I have no idea what the actual frequency limitation of these types of probes are? My guess is they can certainly work beyond 50-60 Hz into the hundreds of Hertz, but they put that value in the specs since many will be using them with non true RMS DMM's and they are calibrated at line frequency. Even the Fluke 80K40 is pretty specific that the stated +/- 5% AC accuracy is specifically obtained at 60 Hz. As for this specific bug zapper, it uses a standard step up transformer so the secondary is also at line frequency. Upon inspection the culprit was easily found: The high voltage wire from the transformer that fed the lower potential grid side was actually pinched under the transformer during assembly. Unreal! It wasn't pinched bad enough to short to ground through the insulation, but it was obviously leaking voltage. After rerouting that pinched wire correctly, voltage on both sides was even so it was an easy fix. 👍
@Rchelicopterfun Thanks for your reply. Yes, I have a Fluke High voltage probe. They come in handy when checking the anode voltage on HF Linear Amps. The one in the video seems quite well constructed and reasonably priced. Thanks.
Thanks for the review. The resistor value in the probe should be 1000 - 1 M ohm or 999 M ohms for a proper divider. But, since the 10 Meg input impedance is in parallel with the 1 M Ohm they would increase the 1 Meg to 1,111,111.1 Ohms to make the 10 Megs in parallel work out to exactly 1 M Ohm, or as close to that value as they can find (probably 1.11 M Ohm). In parallel: Rt = (R1*R2)/(R1+R2).
You mentioned that your electronic air cleaner crapped out. Mine has too. Were you able to figure out what failed? Mine has some strange components that I can't find on the internet, so I'm having to guess what they are and what their specifications might be.
The failure to our air cleaner happened before I got this HV probe, so I was unable to test it (just one reason I've been wanting one). Anyway, to get ours working again, I ordered a new board.
@@Rchelicopterfun Mine was built in 1985 and I can't find a replacement power supply for it, so it's fix it or switch to media filters. It's easier to switch to media, but I really want the high of fixing it (without electrocuting myself in the process).
@@garygilbreath2218 if it's a honeywell electronic Air cleaner, I've had to do all the searching on the internet for instructions etc. and then bought replacement power supplies (yes, 2) off ebay. mine was ancient F50A, and it's still possible to get the replacements.
@@ronlamb-strategy2execution110 I also have a Honeywell F50A and was able to fix it by replacing the power supply. The one I'm having trouble with is a Carrier 31MP420110. It's got 8 passive components, so it's pretty simple. I'm considering buying another Honeywell PS and just using that in there instead.
@@garygilbreath2218 you’re fortunate that the new power supply fixed it. I’ve bought two new power supplies or differing versions but neither will light up the neon light, so can’t figure out what’s going on that none of the new boards fixes it.
I didn't think those bug zapper transformers were actually midpoint grounded transformers, mi e were always a direct output line to line of the transformer with no ground on the core. Odd. Very nice vid.
@@Rchelicopterfun thank you very much for responding. I figured it would work for discharging a cap with a voltage range between 3500-5000VDC. I saw another video that used one of these to discharge an anode on a crt but never received a reply.
That's the range where these HV probes that are used with DMM's are designed to be the most accurate with the multimeter in the AC scale. You could certainly use them at frequencies outside that range, but then they would not be within their designed +/-5% allowed accuracy tolerance.
@@TitofBee I missed this follow up question but NO, NEVER EVER USE A REGULAR high voltage DMM probe with an o-scope or at high frequency. There are special HV probes for O-scopes to be used at higher frequencies. They cost much more and there is lots more to them in terms of filtering.
If you have to ask ⚠ However, clamp the ground lead to ground and touch the capacitor leads (one at a time) with the probe end for several seconds which will slowly discharge the caps through the resistor to ground.
@@Rchelicopterfun your caution is noted and welcome. I only knew how to discharge them by using a high value resistor. Somehow I had never heard of or seen one of these probes in action. Very cool, thanks for answering.
Good eye, but the value is actually 2.974 so 2974V just before the probe end made full contact with the terminal and the reading stabilized. The decimal actually dropped one place of resolution before the value changed (autoranging 4000 count meter).
Neither. It was the display reaction time delay (DMM & LCD refresh rates) from when it reached its 4000 count limit (this is a 4000 count DMM) and dropped a decimal place of resolution before the value refreshed momentarily showing 4 places of resolution and the 29.74V value instead of 3 places of resolution @ 2.97V. If it was an 8000 or higher count meter, that decimal drop wouldn't have occurred and the meter would still indicated 4 places of resolution instead of 3 as the reading stabilized to it's final value of 7.80. You'll notice right after that 29.74 value was show is when the meter dropped to 3 places of resolution. If you are not familiar what DMM meter count is and how it affects resolution of readings, there is lots of info online. In short, DDM meters need to stabilize before you take a reading; no useful values are obtained as they jump around when first probe contact is made, especially when used in autoranging in combination with a high voltage probe where voltage potential will be read even before the probe makes contact due to the air molecules in the near vicinity of the HV source being ionized (conductive).
I'm researching discharging crt monitors to perform some maintenance. I've see people using screwdrivers with wires attached, a hv probe seems more legit. Ive also heard claims crts can go 30kv easy, so this still would be insuficient for crts?
Hi,fluke 80k-40 model HV probe used for measure 5kv in DC measure 1kv output 1v but in AC its measure value is 1kv output 0.53v. Can u reply me what is conversion in DC and AC
I'm so very confused! On DK's voltage divider calculator, you put in 10,000,000,000R / 10,000,000R which does give you your 1000:1 ratio.....HOWEVER 1,000 megaohms is NOT 10 billion ohms, it's only 1 billion ohms. Mega = 10^6th. So 1,000 megaohms = 1,000,000,000. That paired with a 10Mohm meter would result in a 100:1 ratio. What am I missing here? Your test obviously showed it was working.
I guess the most (only) logical explanation is the probe's internal resistance is not a thousand M-ohms as stated, but ten thousand mega ohms (10 billion Ohms) to give the 1:1000 attenuation ratio because we know for a fact the meter's impedance is 10 M-ohms. Perhaps the one thousand number is the resistance in the probe end only and then that other variable resistor in the handle is what makes up the difference? No idea as I didn't design the thing; at the end of the day all I care about is that it works safely and gives the correct value at the meter. 🙂
@@Rchelicopterfun I really appreciate the video! I have a HiPot tester at my job and I am going to buy one of these so that I can calibrate the HiPot to make sure that the voltage is coming out at 8kV. Being a perfectionist I wanted to run the math to make sure before I purchased it, and I got very confused when I started doing research! If you go to Fluke's datasheets, they also say their probes are a 1000Mohm resistance paired with a 10Mohm DMM makes for a 1000:1 ratio, so it's quite confusing! If I find out why this is I'll make sure to drop a comment here. I'm sure there's some logical explanation!
@AJ Robinson - much apricated if you can comment back if you figure out the reason. None of my my DMM's can measure super high resistances so I can't confirm what the probe's resistance actually is. I was only only going off the specs of the probe, but the more I think about it (while I should actually be working - lol), I'm guessing the big resistor/s in the probe tip is/are 1000 M-Ohm as stated. Going by the current draw table in the Fluke manual, that number holds correct at the various voltages they list. That variable resistor in the handle is the key I think. I'm not at home right now to check, but going by what I can see in the video, it looks to be in parallel across the two leads going back to the meter. If that's the case, it would be dropping value of the meter's 10M-ohm impedance down to... 1M-Ohm?
@@Rchelicopterfun got it! If you check the manual one more time, you'll see that there is a resistor "RB" [~1.11Mohm listed in another fluke manual (80K-15) in parallel with the multimeter. That brings the total resistance of the meter down to 1 megahohm giving us our 1000:1 ratio!
RC helicopters are largely what got me into both mechanics (former auto mech as well), and electronics (took several electronic tech courses in college and worked at a semiconductor manufacturing facility in the test & QC department post college). Yep, heli's messed me up - in a good way 🙂
![Blox Fruits Dragon Rework Update [Full Stream]](http://i.ytimg.com/vi/EqDAp8udhm0/mqdefault.jpg)
Pintech HPV-40 High Voltage Probe @ Banggood:
www.banggood.com/custlink/mGvDu3N9Ku
Having a pacemaker in my chest, I kept my hands away from the mouser and keyboard for the whole video. Nice looking probe.
Good call.
When you checked the bug zapper, I wondered if the output was around the supply frequency or if they upped he frequency ? The specs refer to 50/60 Hz. I wonder how it performs at high frequencies. CRT Drive circuits used to work at 15.625 kHz on the AC side and produce up to 25 kV on color TV sets. Keep frequency in mind as this could be an issue with the probe.
Yes, good point. HV probes like this one and the Fluke 80K40 are no go at measuring high frequency AC. There are special HV oscilloscope probes that are used for those specific applications (very pricy) 🙂
These things work best for HV DC and of course nominal line voltage frequencies. Also the DDM will play a roll in that as it would have to be true RMS (which the 17B is not), and most true RMS meters that I've played around with over the years start dropping AC voltage accuracy over 1kHz but I know it all depends on the meter and I have no idea what the actual frequency limitation of these types of probes are? My guess is they can certainly work beyond 50-60 Hz into the hundreds of Hertz, but they put that value in the specs since many will be using them with non true RMS DMM's and they are calibrated at line frequency. Even the Fluke 80K40 is pretty specific that the stated +/- 5% AC accuracy is specifically obtained at 60 Hz.
As for this specific bug zapper, it uses a standard step up transformer so the secondary is also at line frequency. Upon inspection the culprit was easily found: The high voltage wire from the transformer that fed the lower potential grid side was actually pinched under the transformer during assembly. Unreal! It wasn't pinched bad enough to short to ground through the insulation, but it was obviously leaking voltage. After rerouting that pinched wire correctly, voltage on both sides was even so it was an easy fix. 👍
@Rchelicopterfun Thanks for your reply. Yes, I have a Fluke High voltage probe.
They come in handy when checking the anode voltage on HF Linear Amps.
The one in the video seems quite well constructed and reasonably priced. Thanks.
Thanks for the review. The resistor value in the probe should be 1000 - 1 M ohm or 999 M ohms for a proper divider. But, since the 10 Meg input impedance is in parallel with the 1 M Ohm they would increase the 1 Meg to 1,111,111.1 Ohms to make the 10 Megs in parallel work out to exactly 1 M Ohm, or as close to that value as they can find (probably 1.11 M Ohm). In parallel: Rt = (R1*R2)/(R1+R2).
Got one myself recently, need to test it's performance at high frequency.
You went from melting fillings in your teeth to melting out brain cells. Sounds like my kind of day, only I have no more brain cells
Thank you for this video. Is it possible to teach microwave trans testing with this probe?
The ground lead is not only for safety, without it connected it will not work as the ground lead is also the bottom of the potential divider resistor
You mentioned that your electronic air cleaner crapped out. Mine has too. Were you able to figure out what failed? Mine has some strange components that I can't find on the internet, so I'm having to guess what they are and what their specifications might be.
The failure to our air cleaner happened before I got this HV probe, so I was unable to test it (just one reason I've been wanting one). Anyway, to get ours working again, I ordered a new board.
@@Rchelicopterfun Mine was built in 1985 and I can't find a replacement power supply for it, so it's fix it or switch to media filters. It's easier to switch to media, but I really want the high of fixing it (without electrocuting myself in the process).
@@garygilbreath2218 if it's a honeywell electronic Air cleaner, I've had to do all the searching on the internet for instructions etc. and then bought replacement power supplies (yes, 2) off ebay. mine was ancient F50A, and it's still possible to get the replacements.
@@ronlamb-strategy2execution110 I also have a Honeywell F50A and was able to fix it by replacing the power supply. The one I'm having trouble with is a Carrier 31MP420110. It's got 8 passive components, so it's pretty simple. I'm considering buying another Honeywell PS and just using that in there instead.
@@garygilbreath2218 you’re fortunate that the new power supply fixed it. I’ve bought two new power supplies or differing versions but neither will light up the neon light, so can’t figure out what’s going on that none of the new boards fixes it.
I didn't think those bug zapper transformers were actually midpoint grounded transformers, mi e were always a direct output line to line of the transformer with no ground on the core. Odd. Very nice vid.
Thanks for sharing
Could this probe be used to discharge a HV capacitor that is on a microwave unit?
@@RyanReszczynski Absolutely
@@Rchelicopterfun thank you very much for responding. I figured it would work for discharging a cap with a voltage range between 3500-5000VDC. I saw another video that used one of these to discharge an anode on a crt but never received a reply.
Thank you.
Welcome
Thanks for another great video. Looks like a nice product but why is it restricted to 50/60 Hz?
That's the range where these HV probes that are used with DMM's are designed to be the most accurate with the multimeter in the AC scale. You could certainly use them at frequencies outside that range, but then they would not be within their designed +/-5% allowed accuracy tolerance.
@@Rchelicopterfun Hi John, let's say 100khz, do you think it should work with 90% accuracy ? for exemple on a scope?..
@@TitofBee I missed this follow up question but NO, NEVER EVER USE A REGULAR high voltage DMM probe with an o-scope or at high frequency. There are special HV probes for O-scopes to be used at higher frequencies. They cost much more and there is lots more to them in terms of filtering.
How would I discharge a microwave capacitor with this?
If you have to ask ⚠ However, clamp the ground lead to ground and touch the capacitor leads (one at a time) with the probe end for several seconds which will slowly discharge the caps through the resistor to ground.
@@Rchelicopterfun your caution is noted and welcome. I only knew how to discharge them by using a high value resistor.
Somehow I had never heard of or seen one of these probes in action. Very cool, thanks for answering.
17:54 - 29,740 Volts
Good eye, but the value is actually 2.974 so 2974V just before the probe end made full contact with the terminal and the reading stabilized. The decimal actually dropped one place of resolution before the value changed (autoranging 4000 count meter).
@@Rchelicopterfun Ok, so, that very high voltage is not a peak, but a bad first contact or a wrong DMM first reading?
Neither. It was the display reaction time delay (DMM & LCD refresh rates) from when it reached its 4000 count limit (this is a 4000 count DMM) and dropped a decimal place of resolution before the value refreshed momentarily showing 4 places of resolution and the 29.74V value instead of 3 places of resolution @ 2.97V.
If it was an 8000 or higher count meter, that decimal drop wouldn't have occurred and the meter would still indicated 4 places of resolution instead of 3 as the reading stabilized to it's final value of 7.80. You'll notice right after that 29.74 value was show is when the meter dropped to 3 places of resolution.
If you are not familiar what DMM meter count is and how it affects resolution of readings, there is lots of info online. In short, DDM meters need to stabilize before you take a reading; no useful values are obtained as they jump around when first probe contact is made, especially when used in autoranging in combination with a high voltage probe where voltage potential will be read even before the probe makes contact due to the air molecules in the near vicinity of the HV source being ionized (conductive).
@@Rchelicopterfun WOW, thank you for the explanation. Do more videos about High Voltage !!! Regards.
I'm researching discharging crt monitors to perform some maintenance. I've see people using screwdrivers with wires attached, a hv probe seems more legit. Ive also heard claims crts can go 30kv easy, so this still would be insuficient for crts?
Hi, is there a way to chech that hv-probe is working and it does it job right without the hv source?
Not that I know of.
You could use It on a lower voltage that the meter is able to measure without the probe. Just do the math for the readings.
Hi,fluke 80k-40 model HV probe used for measure 5kv in DC measure 1kv output 1v but in AC its measure value is 1kv output 0.53v.
Can u reply me what is conversion in DC and AC
I'm so very confused! On DK's voltage divider calculator, you put in 10,000,000,000R / 10,000,000R which does give you your 1000:1 ratio.....HOWEVER 1,000 megaohms is NOT 10 billion ohms, it's only 1 billion ohms. Mega = 10^6th. So 1,000 megaohms = 1,000,000,000. That paired with a 10Mohm meter would result in a 100:1 ratio. What am I missing here? Your test obviously showed it was working.
I guess the most (only) logical explanation is the probe's internal resistance is not a thousand M-ohms as stated, but ten thousand mega ohms (10 billion Ohms) to give the 1:1000 attenuation ratio because we know for a fact the meter's impedance is 10 M-ohms. Perhaps the one thousand number is the resistance in the probe end only and then that other variable resistor in the handle is what makes up the difference? No idea as I didn't design the thing; at the end of the day all I care about is that it works safely and gives the correct value at the meter. 🙂
@@Rchelicopterfun I really appreciate the video! I have a HiPot tester at my job and I am going to buy one of these so that I can calibrate the HiPot to make sure that the voltage is coming out at 8kV. Being a perfectionist I wanted to run the math to make sure before I purchased it, and I got very confused when I started doing research! If you go to Fluke's datasheets, they also say their probes are a 1000Mohm resistance paired with a 10Mohm DMM makes for a 1000:1 ratio, so it's quite confusing! If I find out why this is I'll make sure to drop a comment here. I'm sure there's some logical explanation!
@AJ Robinson - much apricated if you can comment back if you figure out the reason. None of my my DMM's can measure super high resistances so I can't confirm what the probe's resistance actually is. I was only only going off the specs of the probe, but the more I think about it (while I should actually be working - lol), I'm guessing the big resistor/s in the probe tip is/are 1000 M-Ohm as stated. Going by the current draw table in the Fluke manual, that number holds correct at the various voltages they list. That variable resistor in the handle is the key I think. I'm not at home right now to check, but going by what I can see in the video, it looks to be in parallel across the two leads going back to the meter. If that's the case, it would be dropping value of the meter's 10M-ohm impedance down to... 1M-Ohm?
@@Rchelicopterfun got it! If you check the manual one more time, you'll see that there is a resistor "RB" [~1.11Mohm listed in another fluke manual (80K-15) in parallel with the multimeter. That brings the total resistance of the meter down to 1 megahohm giving us our 1000:1 ratio!
Cool !!!
just curious how a rcheli guy knows about this stuff? I am an auto mechanic tech but did never see this stuff
RC helicopters are largely what got me into both mechanics (former auto mech as well), and electronics (took several electronic tech courses in college and worked at a semiconductor manufacturing facility in the test & QC department post college). Yep, heli's messed me up - in a good way 🙂
you never did check to see if there was a ground ring in the black flange as you mentioned in the beginning.
I most certainly did. Re-watch it 8:30
I will like to see this probe on the microwave magnetron or the transformer if you can,
Thanks 🙏🏻
It is like a wand
Low current needs high voltage to kill.