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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 output +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

Keithley 2500 Service Manual

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