Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
ocw:
With the talk of True-RMS validity and accuracy I considered a good way to verify that feature. I thought that the simple way with a known result would be to measure the RMS voltage of a square wave. I chose a 3 volt peak-peak square wave. It has a computed RMS value of 2.1213203 volts. My measurements were:
V % Error
Agilent 34401A 2.12037 -0.04
Keithley 2015 2.1197 -0.08
Keysight U1252B 2.1208 -0.02
Aneng AN8008 2.112 -0.44
Uni-T UT210E 2.112 -0.44
Uni-T UT61E 2.1233 0.09
Mastech MS8218 2.1216 0.01
Fluke 96B 2.120 -0.06
Fluke 77 2.331 9.88
Circuit Sp CSI2010 2.35 10.78
RShack 22-186A 2.373 11.86
Triplett 60 2.14 0.88
I think that I can spot the meters without True-RMS. But, check out the reliable old Triplett 60 analog meter. Not bad!
Based on the readings above, is the Aneng AN8008 using the same IC as the UT210E?
Shorting the input jacks produces the following readings:
0.000 mV DC with a rare jump to 0.005 mV (nothing in-between)
0.000 mV AC
00.00 ohms
00.00 to 00.01 uA DC
00.00 uA AC
The above is with a 2 cm wire between the input jacks.
ocw:
--- Quote ---I'd like to see the accuracy comparison with a high end bench or hand held multimeter at the microvolts level.
--- End quote ---
The AN8008 uV accuracy is limited due to it just having 1 uV resolution. I can easily make mV comparisons:
34401A AN8008
2.4689 mV 2.477 mV (2.476 - 2.478)
4.9503 4.957
7.4172 7.423
9.8978 9.902
Those are actually uV readings with the most resolution possible--not bad.
Additional tests later.
RedSky:
--- Quote from: ocw on July 13, 2017, 03:13:42 am ---Shorting the input jacks produces the following readings:
0.000 mV DC with a rare jump to 0.005 mV (nothing in-between)
--- End quote ---
Thanks for doing those tests, much appreciated.
I believe this is the first meter that I know of that can read down to the 1uV level less than around $100, apart from the Holdpeak HP-770d (which there isn't much information about around and dubious on the quality front) for $20 it's a bargain. Mind you those meters up around the $100 range are of course 50,000 count as well, which this isn't.
0.33% off your 34401A at worst on the mV level to 3 decimal places is impressive for a meter this cheap.
Looking forward to seeing if my unit (still on it's way) is this accurate, could be a very useful little meter.
ocw:
I give the AN8008 an A+ for its low DC current readings. It had the same 0.01 uA resolution as my 34401A and U1252B have and the 0.25, 0.5, 0.75 and 1.0 uA readings were almost identical between the three. The AN8008 had the same stability for the 0.25 uA reading as the U1252B had. Both had a little better stability there compared to my 34401A.
I made a quick DC voltage reading comparison between the three and saw 5.00378V from my 34401A, 5.0043 from the U1252B and 5.001 V from the AN8008. <<< Corrected!
While it is rated to measure the frequency up to 10 MHz I had problems above 5 MHz. After getting a reading at 6 MHz with a bit larger signal level I stopped trying. The frequency measurement accuracy was good. I really liked the 1 mHz resolution below 10 Hz and 10 mHz resolution from there up to just below 100 Hz. Frequency readings below 1 Hz were difficult to make and only intermittently appeared. I didn't see much of a sensitivity change between sine and square waves.
Its low value capacitance measurement was limited by just having a nF scale as its lowest with the lack of a zeroing control.
It has passed my tests for good performance from a low cost meter.
I'll probably do a complete accuracy verification test over the weekend but that generally amounts to a lot of numbers which won't reveal much more.
deflicted:
--- Quote from: ocw on July 14, 2017, 01:18:18 am ---... 5.00378V from my 34401A, 5.0043 from the U1252B and 5.001 V from the U1252B.
--- End quote ---
I'm guessing one of those U1252Bs was supposed to be AN8008? :)
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