Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
EEVblog:
--- Quote from: Mark Hennessy on July 15, 2017, 12:17:18 am ---However, what about the AN8008? Nothing happens when you short it.
--- End quote ---
Not that I could see.
ocw:
--- Quote ---has anybody tested the burden voltage on the low current ranges?
--- End quote ---
The burden voltage is dependent on the current.
The shunt resistance of the AN8008 was 100.561 ohms when the meter was in the uA position and 0.0301 ohms when the meter was in the mA/A position.
ocw:
As somewhat referred to previously, the AN8008 is a poor meter to use between 1 - 100 mA. I just completed my detailed accuracy verification of the lower current readings. For an approximately 1 mA current reading I had the choice of 989.8 uA (1.01% low due to the 100.561 meter insertion resistance) or 1.0 mA. Yes, that's two digits, 10% error represented by the least significant digit. That's the best resolution possible just above 1 mA. The -1% uA error continued down to around 200 uA. When the reading was corrected for the added resistance, the uA accuracy was typically below 0.1%.
The DC voltage reading accuracy was typically 0.06% The resistance reading accuracy was typically below 0.3%. Most of my resistors used for accuracy verification were rated at 0.01% accuracy.
More tests tomorrow.
floobydust:
Experimenting with DCV using a homemade precision DC reference, I find the readings are a bit quirky.
-ve input always reads a few counts less than flipping the leads.
I see the (long-term) averaging algorithm has hysteresis of at least +/- one count, and you can get it to "stick" either way. (If you've ever written code to average A/D readings, you know how hard it is to react to fast changes and also filter out noise).
The meter seems to jump to a reading based on the first (fast) voltage sample, then after 2-4 seconds the long-term average adjusts the reading. Since the long-term average has hysteresis, it may or may not correct. It seems to depend on the difference between the samples, or if the sign changed.
What I am saying is if the meter reads 5.000V right away, it stays there.
If the meter reads 4.997V initially, it may slowly move to 4.998V or 4.999V.
If the meter reads 4.964V initially, after 2 seconds it corrects to 4.998V
You can try making glitches- connect/disconnect the leads quickly and notice the readings are inconsistent by about 3 counts. Not a big deal, I 'm used to getting the same number regardless.
matura713:
what I don't understand - considering any DMM based on DTM0660L chipset can be hacked just with changing few bytes in the EEPROM from 6000 to 9999 counts and that is widely known, is there any real difference in accuracy between AN8008 (ZT109) and for example AN8002 (ZT102) hacked to 9999 counts? or hacked HoldPeak HP890CN (the OEM revision of HoldPeak HP-770HC)?
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