Keithley 2500, Руководство по обслуживанию

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2-22 Calibration Model 2500 Service Manual
Step 2. Channel 1 input offset voltage calibration
1. Install a triax shielding cap on the channel 1 INPUT jack.
2. Send this command to calibrate channel 1 input offset voltage:
:CAL:PROT:SOUR1:OFFS
Step 3. Channel 1 voltage source calibration
Follow these steps to calibrate the channel 1 voltage bias source. Table 2-8 summarizes
channel 1 calibration voltages and commands.
1. Connect the DMM to the Model 2500 channel 1 OUTPUT and INPUT LO termi-
nals, as shown in
Figure 2-1 .
2. Select the DMM DC voltage function and enable auto-range.
3. Send this command to turn on the channel 1 output:
:OUTP1 ON
4. Send the following command to select the channel 1 10V voltage bias range:
:SOUR1:VOLT:RANG 10
5. Send the following command to 10V:
:SOUR1:VOLT 10
6. Note and record the DMM reading, and send that value as the parameter for the fol-
lowing command:
:CAL:PROT:SOUR1 <DMM_Reading>
For example, if the DMM reading is 9.95V, the correct command is:
:CAL:PROT:SOUR1 9.95
7. Send the following command to output 0V:
:SOUR1:VOLT 0
8. Note and record the DMM reading, and send that value as the parameter for the fol-
lowing command:
:CAL:PROT:SOUR1 <DMM_Reading>
9. Send the following command to output -10V:
:SOUR1:VOLT -10
10. Note and record the DMM reading, and send that value as the parameter for the fol-
lowing command:
:CAL:PROT:SOUR1 <DMM_Reading>
11. Repeat steps 4 through 10 for the 100V range using Table 2-8 as a guide. Be sure
to:
• Select the 100V range using the :SOUR1:VOLT:RANG 100 command.
• Send the ±100V source values where appropriate.
12. Send this command to turn off the channel 1 output:
:OUTP1 OFF