Keithley 6220 Reference Manual page 395

Model 6220/6221 Reference Manual
Step 4: Calibrate guard circuit
1.
2.
Step 5: Send dates, save calibration, and lock output calibration
Send these command to send dates, save calibration constants and dates, and
then finally lock out calibration:
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Connect the digital multimeter to the Model 6220/6221 GUARD and LO
jacks as shown in Figure
of the Model 6220/6221 OUTPUT jack together as shown. Select the DMM
DC voltage function with auto range enabled.
Send these commands in order to calibrate the guard circuit using the
<DMM_Reading> parameter (actual digital multimeter reading) for each
step:
SOUR:CURR:RANG 2e-4
SOUR:CURR 2e-5
OUTP ON
CAL:PROT:GUAR:STEP1:INIT
CAL:PROT:GUAR:STEP1 <DMM_Reading> ' Cal step 1 with reading.
CAL:PROT:GUAR:STEP2:INIT
CAL:PROT:GUAR:STEP2 <DMM_Reading> ' Cal step 2 with reading.
OUTP OFF
CAL:PROT:DATE 2004,05,15
CAL:PROT:NDUE 2005,05,15
CAL:PROT:SAVE
CAL:PROT:LOCK
Return to
17-4. Be sure to connect the HI and LO terminals
' Set current range to 200μA.
' Set current source to 20μA.
' Turn on output.
' Set up for step 1 guard cal.
' Set up for step 2 guard cal.
' Turn off output.
' Send cal date (5/15/2004).
' Send cal due date (5/15/2005).
' Save cal constants and dates.
' Lock out calibration.
Section 17 topics
Calibration 17-19