17-12 Calibration
Model 6220/6221 Reference Manual
Return to
3.
Select GUARD, then press ENTER. The unit will display:
POSITIVE GUARD CAL
Press ENTER to 020.00uA
4.
Press ENTER to 20
μ
A for positive guard calibration. The instru-
ment will prompt as follows:
DMM RDG=+22.00000mV
Use , , , ,
ENTER,
or
EXIT
5.
Note the DMM reading, then adjust the Model 6220/6221 display to agree
with that value.
6.
Press ENTER. The display will prompt:
NEGATIVE GUARD CAL
Press ENTER to Output -020.00uA
7.
Press ENTER to output -20
μ
A for negative guard calibration. The instru-
ment will prompt as follows:
DMM RDG=-22.00000mV
Use , , , ,
ENTER,
or
EXIT
8.
Note the DMM reading, then adjust the Model 6220/6221 display to agree
with that value, and then press ENTER.
Figure 17-4
Connections for guard calibration
Output
6220/6221
Digital Multimeter
(Measure DC Voltage)
Input
High
Low
Guard
Low
Connect
High and Low
of Output
Together
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