Keithley 2790, Reference Manual

Page: 434 / 568

Model 2790 SourceMeter
®
Switch System Reference Manual 17-15
4. Unlock the calibration function by sending this command:
:CAL:PROT:CODE 'KI002790'
(The above command shows the default code, KI002790. Substitute the correct
code if changed.)
5. Send the following command to initiate calibration:
:CAL:PROT:INIT
Short and open calibration
1. Connect the Model 8610 low-thermal short to the instrument INPUT and SENSE
terminals as shown in
Figure 17-1 . Make sure the INPUTS button is not pressed in
so that the front inputs are active. Wait at least three minutes before proceeding to
allow for thermal equilibrium.
klqb
Be sure to connect the low-thermal short properly to the HI, LO, and SENSE ter-
minals. Keep drafts away from low-thermal connections to avoid thermal drift,
which could affect calibration accuracy.
2. Send the following command:
:CAL:PROT:DC:STEP1
3. After the Model 2790 completes this step, remove the low-thermal short and then
send this command:
:CAL:PROT:DC:STEP2
klqb
Be sure to minimize movement near front input terminals. Excessive movements
can cause capacitive coupling errors, which could affect calibration accuracy.