Keithley 2010, Service Manual

Page: 42 / 134

DC volts calibration
After front panel short and open steps, perform the following:
1. Connect the calibrator to the Model 2010 as shown in Figure 2-2 . Allow three minutes
for thermal equilibrium.
NOTE Although 4-wire connections are shown, the sense leads are connected and
disconnected 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 sensing is to be
turned off, and connect the sense leads when external sensing is to be turned on.
Disconnect sense leads when calibrating and verifying AC volts.
NOTE Disconnect sense leads when calibrating and verifying AC volts.
2. Perform the calibration steps summarized in Table 2-8 . 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 2010 completes each step before continuing.
Table 2-8
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
* Change parameter accordingly if using a different calibrator voltage.
Calibration 2-15