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Reference PCB for Calibrating DMM's

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dophuc:
I usually use LB02A as a device to calibrate DMM or power supply, the accuracy of LB02A is about 0.025% and many functions like: V (1-11V), mA (0-24mA) Ohm (0-2200 Ohm) , ... especially simulates various types of thermoelectric signals Type T, J, K, ...PT100, PT1000...
Not extremely accurate but versatile and under $100 (I bought it on Aliexpress for $74 on sale  ;D)

robert.rozee:
i believe the original poster, JenniferG, was just after doing a sanity check on her two meters (one 5½ digits benchtop, the other 4½ digits handheld). i'm picking that the Instek GDM-8251A (benchtop) is far more likely to be reading true.

for this sort of check one doesn't need anything too fancy, and a 0.01% resistor of known value and a 5v MAX6350 or similar would be fine. no need to go overboard buying a "DMMCheck Plus" or similar. indeed, for the average electronics hobbyist, a 2% accuracy 3½ digit multimeter is mostly fine!


cheers,
rob   :-)

JenniferG:

--- Quote from: robert.rozee on November 26, 2022, 01:45:41 pm ---i believe the original poster, JenniferG, was just after doing a sanity check on her two meters (one 5½ digits benchtop, the other 4½ digits handheld). i'm picking that the Instek GDM-8251A (benchtop) is far more likely to be reading true.

for this sort of check one doesn't need anything too fancy, and a 0.01% resistor of known value and a 5v MAX6350 or similar would be fine. no need to go overboard buying a "DMMCheck Plus" or similar. indeed, for the average electronics hobbyist, a 2% accuracy 3½ digit multimeter is mostly fine!


cheers,
rob   :-)

--- End quote ---

Yeah the UT61E seems a bit off compared to the GW.  But also I've never tested my Gwinstek to see how close it is to be accurate.  I bought it used in 2017 off ebay and it's been sitting here; just finally now I've really gotten interested in electronics.  It came from the big sale of ITT equipment when they shut down.  It doesn't have a calibration sticker on it.

bdunham7:

--- Quote from: JenniferG on November 26, 2022, 06:52:05 pm ---Yeah the UT61E seems a bit off compared to the GW.  But also I've never tested my Gwinstek to see how close it is to be accurate.

--- End quote ---

How much off? By the specs, at the UT61E has an uncertainty of +/- 51mV, while the GDM8251A is +/- 1.7mV, or 30X better.  In real life, I'd expect the UT61E to be better than its specs by quite a bit, the GDM8251A not so much, so maybe 5-10X better.  The expectation would be that any small discrepancy (<50mV @ 10V) would be likely mostly due to the error of the UT61E, but a large discrepancy is equally likely to be either one since that would indicate a gross failure on the part of one or the other.

mawyatt:
Here's something the OP & others may find interesting.

https://www.eevblog.com/forum/testgear/ac-rms-dmm-tests/msg3940957/#msg3940957

Been running continuously for a couple years and still producing good results.

Edit: Update just checked last night and the device had failed, just completed update & repair on the mentioned thread.

Best,

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