Keithley KUSB-3100, User Manual

Page: 97 / 129

Calibration
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Note: At any time, you can click Restore Factory Settings to reset
the A/D calibration values to their original factory settings. This
process will undo any auto or manual calibration settings.
Using the Manual Calibration Procedure
If you want to manually calibrate the analog input circuitry instead of
auto-calibrating it, perform the following steps:
1. Adjust the offset by performing the following steps:
a. Verify that 0V is applied to AD Ch0, and that A/D Channel
Select is set to Channel 0.
The current voltage reading for this channel is displayed in the A/D
Value window.
b. Adjust the offset by entering values between 0 and 63 in the
Offset edit box, or by clicking the up/down buttons until the
A/D Value is 0 V.
2. Adjust the gain by performing the following steps:
a. Verify that 9.375V is applied to AD Ch0, and that A/D
Channel Select is set to Channel 0.
The current voltage reading for this channel is displayed in the A/D
Value window.
b. Adjust the gain by entering values between 0 and 63 in the
Gain edit box, or by clicking the up/down buttons until the
A/D Value is 9.3750.