Keithley 2790, Reference Manual

Page: 435 / 568

17-16 Model 2790 SourceMeter
®
Switch System Reference Manual
DC volts calibration
After the front panel short and open steps, do the following:
1. Connect the calibrator to the Model 2790 as shown in Figure 17-2 . Allow three
minutes for thermal equilibrium.
klqb
Although 4-wire connections are shown, the sense leads are connected and dis-
connected at various points in this procedure by turning calibrator external
sense on or off as appropriate. If your calibrator does not have provisions for
turning external sense on and off, disconnect the sense leads when external sens-
ing is to be turned off and connect the sense leads when external sensing is to be
turned on.
2. Perform the calibration steps summarized in Table 17-8 . For each step:
• Set the calibrator to the indicated voltage and make sure the unit is in operate.
(Use the recommended voltage if possible.)
• Send the indicated programming command. (Change the voltage parameter if
you are using a different calibration voltage.)
• Wait until the Model 2790 completes each step before continuing.
klqb
Ensure the calibrator has settled to the final value. You can do so by verifying
that the “Settled” indicator is off or by using the *OPC? (operation complete)
query.
Table 17-8
DC voltage calibration programming steps
Calibration
step
Calibrator
voltage Calibration command*
Parameter
range
+10V
-10V
100V +10.00000V
-10.00000V
100.0000V :CAL:PROT:DC:STEP3 10
:CAL:PROT:DC:STEP4 -10
:CAL:PROT:DC:STEP5 100 9 to 11
-9 to -11
90 to 110
*Use recommended value where possible. Change parameter accordingly if using a different
calibrator voltage.