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