Products > Test Equipment
Calibration of an ANENG AN870
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floobydust:
It's not just the reference voltage that affects a function's calibration.
Most of the DMM functions include the reference voltage plus additional divider or shunt resistors, so the CAL values end up covering for all of these parts.
You can try do a manual CAL with the multimeter, or read/modify the external EEPROM if it has one.

OP was trying to super-calibrate his DMM, which I think is a poor idea because plain 1% resistors are not 0.01% resistors afterwards.
ialbert:
just for info.

my an870 suddenly gives bad value. DC and Resistance.
I shorted a jumper inside to activate CAL.
Turn on the DMM. Set it to res/diode.
Press the Select to SKIP those hex value.
then for ex. you want to calibrate DC. set the knob there.
then get a supply like for AN870. on DC set external supply to 1v, put the probe then it will show the reading. you can press the hold button to calibrate it for the right value.
same with resistance.
after that you can remove the jumper inside.
and it works. now my an870 gives right value again.
ivo:

--- Quote from: ialbert on November 25, 2022, 05:03:33 pm ---just for info.

my an870 suddenly gives bad value. DC and Resistance.
I shorted a jumper inside to activate CAL.
Turn on the DMM. Set it to res/diode.
Press the Select to SKIP those hex value.
then for ex. you want to calibrate DC. set the knob there.
then get a supply like for AN870. on DC set external supply to 1v, put the probe then it will show the reading. you can press the hold button to calibrate it for the right value.
same with resistance.
after that you can remove the jumper inside.
and it works. now my an870 gives right value again.

--- End quote ---

Thanks for this, now my AN870 reads 5.000V on my standard instead of 5.005V! Although the 'menus' were a bit f***y. Operator beware, it wants exact 1 x 10n values only (I think)! I tried to get it to cal 5V (thinking maybe the hold let you move the cal offset value around somehow) and almost stuffed my main voltage reading! It thought everything was half its value (5 is half of 10 I guess), and it really struggled to hold and take a 10V back exactly as a new cal reading. Got there in the end though.
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