Keithley 6220

Model 6220/6221 Reference Manual Calibration 17-19
Return to Section 17 topics
Step 4: Calibrate guard circuit
1. Connect the digital multimeter to the Model 6220/6221 GUARD and LO
jacks as shown in Figure 17-4. 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 200μA.
SOUR:CURR 2e-5 ‘ Set current source to 20μA.
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.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com