Maximum Input current for 6210 /-10V Range

[@dave@]

What is the input current spec for the NI USB 6210 when making a single ended (i.e one of its 16 channels) reading in the +/-10V range? I need to quantify the error in a voltage divider I am using to measure a 200VAC ground referenced signal, since part of the current through the voltage divider is splitting off to drive the ADC input on the 6210.

[AnalogKid2DigitalMan · Accepted solution]

From the specs document:

Input impedance

Device on

AI+ to AI GND ......................>10 G

with 100 pF

AI– to AI GND.......................>10 G

with 100 pF

Device off

AI+ to AI GND..................1200

Ω in parallelΩ in parallelΩ

AI– to AI GND ..................1200

Ω

Input bias current.............................±100 pA

I presume the +/-100pA is from 10V/10Gohms. I doubt that the 6210 will load down the divider.

-AK2DM