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Voltage Standard Ref Tests - Digital Multimeter reference / accuracy check
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- เผยแพร่เมื่อ 10 ก.พ. 2012
- I demonstrate the DMMCheck and PentaRef from VoltageStandard (www.voltagestandard.com).
These are Low cost Voltage References and multimeter checks for voltage, current and resistance.
I then run through some tests to compare the accuracy of the following multimeters:
Fluke 287
Brymen TBM867 / BM867
Major Tech MT1887 / Extech EX530
Major Tech MT22
ISO-Tech IDM207
I also introduce the Fluke 87 V which I will review soon.
A list of my multimeters can be purchased here:
astore.amazon.com/m0711-20?_en...
I just ordered some for my bench. The DMMCheck Plus is now being made in North Carolina and I ordered it with the additional capacitor reference board. Very much looking forward to using them to test my new Fluke 87-V.
@samgab Thanks and my pleasure. I did do some quick checks on the 87 and what a surprise....will post soon. I will probably redo the resistance tests....zero the meter to account for leads (which I forgot..) and use a short pair of croc clips with thick conductors.
@Films4You You make a good point about the volts jumping and I have read something about that in a Fluke manual. I'll do some more investigation and feedback. I'll also redo the resistance tests and zero...my mistake. Thanks for watching...will take a look at the VC99 review now.
I fully vouch for the service of Doug at "voltage.com". Due to my work, quite often I have to carry the PentaRef with me on assignment. However, I broke the battery terminals when I had to take the batteries out to clear security at the airport. Not the PentaRef's fault, but rather my own fault. I didn't have any tools at the time, and I just force the issue and broke the terminals. Told Doug about it, and he said to send it back for repair, which is free. I got it back within 3 days and not only was it fully repair, but the PentaRef's voltage reference was re-calibrated. Now that's a 1st class service. This day and age, getting these kind of support is remarkable.
@TheSurvivalSecrets Thanks. There is a follow-up video resolves most of the issues with the 287....but I do plan to get it calibrated as well. Thanks for watching.
@keenantims Yes...I forgot....this is covered in the follow-up video....thanks for watching and posting.
@keenantims Yes, very good point, I might do a follow-up and account for that to see what effect it has.
@samgab Yes...calibration will happen soon...watch the follow-up video which will cover the 87V and a few issues.
@bkupiec You highlighted some critical issues....thanks for picking them up...most of them covered in the follow-up video uploading now. Cheers, Martin.
@DanFrederiksen LOL!! Yes...but there were some issues...watch the follow-up video being uploaded now....
@DanFrederiksen Yup...still on my list!
@electrodacus LOL!! Yes...but watch the follow-up video which is being uploaded now...there were a few issues...
@mjlorton Glad that you found the root cause. Keep those multimeter videos coming, they are fun to watch!
@ihatecrooks Just posting a video on what you have highlighted. Thanks for bringing it to my attention.
Excellent video again Martin, I thoroughly enjoyed this and it certainly made for some interesting results. I would be intrigued to see the results of the 287 after a recalibration and service by a certified agent.
@ihatecrooks You raise an interesting point, I'll check it out and feedback. Thanks for posting.
Nice toys you have Martin
Very good job
mjlorton Martin, when you do videos relating to calibration or accuracy would you please state the temperature in your lab at the time of the test and how that compares to the calibration temp of your references? And, for the benefit of viewers who may not know please explain the impact of temperature to the tests done.
petty
Thanks for an other interesting video !
Would you please check your 287/9 how it behaves. My one with mVdc short shows about 0.016mV constantly. Another suspicious action is that with V input short to COM, selector on Vdc or mVdc when I go PEAK record, I am getting peak max= 0.020V and peak min= -0.020V instantly. Input short with about 100mm long croc clips. Even with 9V battery connected, I'm getting instantly peak min and max with 20mV offset. Strange to me.
Didn't see you zero the leads on ohms - that'd probably account for 1-2 counts on the 1k reading.
These products are great, hadn't heard of them, but for the price I don't think you could beat it even building something on a breadboard. Might have to pick one up...
The way the Brymen handles the last, "hidden" digit is wrong. In short, it simply drops it when displaying 50,000 counts, rather than rounding. If the 500,000 count reading is 1.99999V, you would want the 50,000 count display to show 2.0000V. The Brymen would display 1.9999V.
I don't get it. You could choose your own reference voltages and the description says they let it run for a minimum of 200 hours to get accurate voltage references. So how could he ship the item the same day you ordered? It should have taken 8 days at least.
After they are build they are burned-in for 250 hours (aged). The aged units are standing by ready for someone to order at which point they are calibrated and shipping. Cheers, Mark
Fluke 287 mA test:
Note on your "open" mA reading you are showing -0.005. Where is this small negative current coming from? These are the 5 LSD you are short at the 0.995 reading. If the initial value was zero, then the reading should have be 1.000mA.
Fluke 287 Ohms test:
Note that your open reading on ohms was 4-5 Mohms. Should be near 0L. There is some leakage happening. iex:Your hands, leads, meter case, or your charger. 5Mohm + 9.997k = 9.977k which is closer to your 9.970 reading.
Boa noite
defective megohm limit for fluke 287
3:00
Man thanks a million. Saves my time
I'm finalizing putting together components for a radio club activity, that would do what the DMMcheck does, and I'm no learning about that product. Not that it really matters. While I can't say the DMMcheck is too expensive, it's fair to say that it's unaffordable for me at this time. Facts are facts.
if you dotnt have at least cardboard cutout multi meters in background you are not qualified for YT electrician
did the top of the line fluke just get beaten by a majortech? : )
Dave Jones will be most unhappy that you criticize his deity : )
don't forget the UT61E. I'd love to see it humiliate the Flukes as well : )
deep merciless jabs to the kidney : )
Excuse me AlainH. What a stupid name!!!