Keithley 6220 Reference Manual page 383

Model 6220/6221 Reference Manual
Step 2: Calibrate current source
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Select the DMM DC current function with auto range enabled.
From normal display, select the Model 6220/6221 100mA current source
range. (See Section 3 for details on setting current source range.)
Press the MENU key, select CAL, and press ENTER.
From the main calibration menu, select EXECUTE, and press ENTER. The
instrument will display:
CALIBRATION
SOURCE COMPLIANCE GUARD WAVE
Select SOURCE, then press ENTER. The unit will display:
I-CAL
Press ENTER to Output +100.00mA
Press ENTER to output the positive full-range current value for the pres-
ently selected range. The instrument will prompt as follows:
DMM RDG=+100.0000mA
Use , , , , ENTER, or EXIT
Note the DMM reading, then adjust the Model 6220/6221 display to agree
with that value.
Press ENTER. The display will prompt:
I-CAL
Press ENTER to Output +000.00mA
Press ENTER to output the zero value for the present range. The following
prompt will be displayed:
DMM RDG=+000.0000mA
Use , , , , ENTER, or EXIT
Note the DMM reading, then adjust the Model 6220/6221 display to agree
with that value.
Press ENTER. The display will prompt:
I-CAL
Press ENTER to Output -100.00mA
Press ENTER to output the negative full range value for the present range.
The following prompt will be displayed:
DMM RDG=-100.0000mA
Use , , , , ENTER, or EXIT
Note the DMM reading, adjust the Model 6220/6221 display to agree with
that value, then press ENTER to complete calibration for the present range.
Repeat steps 2 through 13 above for each current range (see
page 17-8). For the 2nA and 20nA ranges, connect the Model 6220/6221 to
the picoammeter input, and use the picoammeter reading at the DMM read-
ing prompt (Figure 17-2).
Return to
(WAVE displayed only for 6221)
Section 17 topics
Calibration 17-7
Table 17-3,