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Measuring VFD's with Clamp Meters
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- Опубликовано: 1 апр 2017
- This video shows why some Clamp Meters have trouble measuring Variable Frequency Drives (VFD's). I take 9 clamp meters, and compare how they measure Voltage, Current, and Frequency on a 1 HP VFD.
Clamp Meters used in this video are:
Fluke 375 - amzn.to/32sKRz7
Amprobe ACD-54Nav - amzn.to/30q0Qey
Fieldpiece SC660 - amzn.to/30kzgiV
UEI 429 - amzn.to/2ZAFdJk
Fluke 324 - amzn.to/3eLRCPf
Klein Tools CL330 - amzn.to/30fNnWM
Ideal 61-736 - amzn.to/3jgtabR
Klein Tools CL110 - amzn.to/2WvFDyH
Commercial Electric MS2002 - www.homedepot.com/p/Commercia...
This is the link to the Resolution and Accuracy video mentioned in this video.
• Meter Accuracy And Dis...
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Thank you for a great video about VFDs and measuring with clamp meters! This was just what I wanted, and a bit more! :)
Loved the throughout explanation about how VFD works, seeing the scope helped a lot. Interesting how some meters were just all over the place with voltages... I'm happy with my new Brymen BM079 so far, although haven't done any VFD measurements with it yet. Thanks again for taking the time & effort!
+kuvittelija
I'm glad it showed the information you were looking for. I don't like my videos to be over 8 minutes long because people lose interest too fast on long videos. So, a lot of stuff went "on the editing room floor", and didn't make the cut. For example, I cur how the drive was drawing 0.5 Amps at 3 Hz (1/20th speed, 1/3 current), and drawing 1.5 Amps at only 20 Hz. I'm thinking I should have just done 1 video on VFD's, then separate videos for each Clamp. That way, people could just watch the Clamp they were interested in. Then, I could have done more testing to figure out why expensive Meters like the UEI were having trouble with some measurements.
I don't own any Brymen Meters yet. Not too popular in the US. I think Greenlee Meters are made by Brymen, and I have one of their DMM's, but no Clamps.
I'm always trying to think of topics that would interest people with Meters. If you think of something else you would like to see, just let me know.
I've done this test on my videos. The Amprobe Navigator-52 needs a minimum of 5 or 6 amps to properly measure frequency through the amp clamp. If people are looking for a meter that can do it all they need to go with the Fluke 376. Not only can it do it without the probes, it can also do it with the iflex probe. Or the alternative reliable Fluke 87-5 with low pass filter on.
Great video. For me, the Fluke 376 is my go-to meter. I've used the Fluke line of meters and equipment for decades, and uninentionaly subjected them to multiple water and heat tortures, but they refuse to die. As with any meter, use only premium grade batteries that do not leak and replace them as needed. A leaking battery will destroy your battery terminals and good luck trying to get the battery manufacturer to replace your meter.
Also, getting a stable accurate amp reading on any meter involves aligning the wire directly in between the two horizontal dashed lines on the face of your clamp meter. If you look closely, there is a horizontal dashed line on either side of the clamp meter jaws and that's where you want to locate your wire. If the wire is situated too high or too low within the clamp, the reading will be different vs centering the wire in the clamp area.
For last 10 -15 years have used the VFD display to read frequency. Seldom used frequency output while troubleshooting numerous 6 & 18 pulse drives.
The scope helped seeing that frequency. Awesome
wish i could afford that Fluke. Love the videos man. Great work.
Perfeito o teste. Fazia tempo que buscava um conteúdo desses. Pra quem trabalha na área industrial, um bom medidor é essencial para afirmar avarias. Como sempre FLUKE se sai superior as demais quanto a isso pois mesmo no mercado possuir vários modelos de qualidade, para atuação no campo os mesmos ainda faltam detalhes. Infelizmente os preços não ajuam muito aqui no Brasil mas, para quem quer garantir uma boa informação vale a pena o investimento!!!!
Great video. With all the VFDs and inverters, a high frequency clamp meter is the way to go. Bluetooth is also a great feature for remote monitoring. 😎 Thank you. Nice video.
wish there was a table at the end to see the results of everything and compare. otherwise, great testing!
Great test!!! THANKS, I enjoyed it!
great video, i personally use a fluke 376fc.... best meter for personal / industrial hands down
Great video!, thank you for posting it
Please make an video for how to measure power for machine tools ( Milling, Turning) using these current clamps. I couldn't find this video on whole youtube. Its really important.
Very interesting video, I subscribed
Great experiment. Thanks
Greeeeat video! Thank you!
I must say great video. Thanks.
Stock just dropped off for some! Great demo
Excellent info
Excelente video y muy práctico komparativs una pre cual amperimetro e recomiendas trurums y ke cheke capacitó res Hz mili amperes y mili voltios y temperatura gracias por información
Awesome video man!
Can u test the Southwire 21050t ... for AC DC current and AC DC voltage and resistance?
Brilliant video thankyou.
So in Pwm signals of a VFD current will be showing higher in a true rms ? And voltage too?
If there's a load on the motor would the frequency change?
I like your oscilloscope!
Can you tell what make & model it is ??? Thanks Ken
Hey bud which hert clamp meter do you recommend for motors under 1 horse power
I need a new meter- for industrial mains I use flukes but £££ so for the job of 12/24v control systems I was looking for a clamp meter with the lowest Amp / mA /uA range that can do DC if any can go that low.
A scope BCN fit clamp probe could be good. Also what about the Testo 770-3 or one of the peak meter range ? Good video & I like the splitter so simple but effective x10.
Can you tell me the exact model number you were using for the Amprobe brand.? it looks to be the Nav series. If that is the case the meter has a low pass filter that needs to be turned on in order to read a freq drive. Can you tell me if you had that turned on? If not can you retest and post the results. I just purchase that meter and am waiting for it to arrive.
it is in the description
MULTIMETERCHANNEL, to measure the motors voltage and frequency you need a VFD filter? why does VFD cause noises and interference?
Whats the model # of the splitter?
Nice video. I was looking to see frequency of amp clamps that aren’t trms
If a drive is set up to output a specific frequency is there a way to tell if the motor is being overloaded at that frequency. I do not think that the motor nameplate full load amps would be accurate at a lower frequency. Many times we cannot run the motor at rated frequency as it could damage the equipment. P. S. Thanks for the knowledge sharing.
Hai sir,
It's very useful video.
Could you please also share the information.
Which is the correct location to measure the motor current in vfd.
Motor in cable or vfd in cable.
Thank you!
I have an question for you if you have a time to answer...
I am about to buy one of this clamp meters:
used perfect condition Fluke 376 (missing iFlex adapter)
or
unused Amprobe ACDC-52NAV.
Both at the same price range. I have trouble to decide which one is bether choice.
Fluke is trusted brand but it seems to me Amprobe have more features and I like it more. I need clamp meter that have inrush feature and both of this instruments satisfies this reqierments.
I know it's an complex question, but based on your experience, what would be your objective choice?
Thanks a lot in advance...
Yo miraria también Hioki, es superior a todas...
So what was the overall average?
Im curious if you turned on the low pass filter on the amprobe? It has an option you have to manually turn on for LPF, not sure about the other meters
Good morning, I have a VFD in which three phase induction motor is attached to and I have a capacitor bank to correct power factor lag. I want to know if it's a good idea to implement both power factor correction and a VFD? Thanks for your good work.
You can, on the line side.
sir, can i know number of voltage if we set different vsd frequency such as 20 Hz , 30 hz, 40 hz, or 50 hz on the display?
at the video at fullspeed frequency vsd we see voltage are +-229 volt
The hundred if drives that I PM'ED, tested & troubleshoot had a linear scale. If a 240 volt 60 Hertz drivecwas at 120 volts frequency would be 30 Hertz. At 180 volts would be 45 Hertz. Might be off at extremely low speed of say 4 Hertz. We never ran fans below 20 % and 25% for pumps. Great vid. I would never purchase or use test or safety equipment made in cheating lying lack of quality control china.
It should generally scale linearly with Hz, and I suspect that's even mostly true when the drive is set to vector control mode.
I'm curious how well the UNI-T UT210E clamp meter does on these.
Probably the least expensive clamp meter with a V.F.C. function and DC amperage measurement.
Aurthor Thing
Sorry, I don't have a UT210E, or I would give it a try for you
I wish I could donate one to ya.
The Tacklife CM02A is another low cost meter that may be able to make accurate measurements.
It blows my mind to see a meter under 20$ that can do all this stuff.
I have several UT Meters, I just don’t have the 210E. You have to be careful with UT sometimes. They can build a quality meter when they want to, but sometimes they build for a low price point, and it shows up in poor functionality.
What is V.F.C. function? Is it frequency clamp measuring?
Does anyone here know how to test the frequency of a 3 phase alternating current generator, is it as simple as placing the + and - probe of the multimer on any of the 2 out of 3 wires?
What brand is that line splitter ?
That was a CEM splitter. But, a line splitter is just a loop of wire, and all brands work well.
so we can't trust the reading oon any meter no matter how expensive.
+WV591
That high frequency noise creates a lot of problems for the meter. Some of the high end Meters can measure them very well. You just need to decide what you want to measure, and select a meter that can handle those readings.
You plug it in backwards the first time!
What’s the best clamp meter for Hvac?
Travis Whitlow
I can’t answer that question without a LOT of additional information. For example,
What price range are you looking in?
What is the maximum voltage and current you want to measure?
Do you want to measure temperature with your clamp, or do you have a separate meter for that?
If you do want to measure temperature, do you have a need for differential temperature?
Do you want to measure capacitance with your clamp, or do you have a separate meter for that?
Do you want storage capabilities?
What is the maximum resistance range you measure to?
Check out the amprobe nav50. It will do everything those two flukes will do also.
@@gl9500
Looks like it can do most of that but doesn't look like it can do DC current.
www.amazon.com/dp/B005409SGI/ref=cm_sw_r_cp_apa_fabc_QsQTFbHNCV501?_encoding=UTF8&psc=1
@@gl9500 that is a good deal. Might pick that combo up also.
Why were you hiding the leads when u tested the H reading on the amprobe??
last time i checked we didn’t measure volunteer fire departments
Avarie H.
Well, you should😉
Analog still batter then digital ... because they are true RMS ....I still prefer analog meter
Where can I get a decent price analog meter under a hundred bucks
I too love analogue meters but don't know of any good ones made today and you do get some looks when out pops the Avo so I use the fluke for easy quick readings others jump about to much. Good video thanks. meters should read right or not at all.
1111
Not being Picky, I don't like cheap meters.
I like to show a range of Meters. Most people searching RUclips about how to use a meter, are not running out and buying a $300 Fluke meter.
That fieldpiece is the ugliest meter ive ever seen