Keithley 2182, Руководство по обслуживанию, Страница: 35 / 120

Remote calibration
Follow the steps in this section to perform calibration via remote. See Appendix B for a
detailed list and description of SCPI calibration commands.
When sending calibration commands, be sure that the Model 2182 completes each step before
sending the next command. You can do so either by observing the front panel CALIBRATING
message, or by detecting the completion of each step over the bus. Be sure to include a space
character between each command and parameter.
The procedures for calibrating the Model 2182 using SCPI commands include:
• Preparing the Model 2182 for calibration
• Front panel short and open calibration
• DC volts calibration
• Programming calibration dates
• Saving calibration constants
• Locking out calibration
Preparing the Model 2182 for calibration
1. Connect the Model 2182 to the IEEE-488 bus of the computer using a shielded
IEEE-488 cable, such as the Keithley Model 7007, or connect the unit to a computer
through the RS-232 port using a straight-through 9-pin to 9-pin cable (use a 9 to 25-pin
adapter if necessary).
2. Turn on the Model 2182, and allow it to warm up for 2-1/2 hours before performing
calibration.
3. Select the DCV1 function.
4. Make sure the primary address of the Model 2182 is the same as the address specified in
the program that you will be using to send commands. (Use the GPIB key.)
5. Unlock the calibration function by sending this command:
:CAL:PROT:CODE 'KI002182'
(The above command shows the default code, KI002182. Substitute the correct code if
changed.)
6. Send the following command to initiate calibration:
:CAL:PROT:INIT
Short and open calibration
1. Connect the Model 2188 low-thermal shorting plug to the instrument input jack, as
shown in
Figure 2-1 . Wait at least two minutes before proceeding to allow for thermal
equilibrium.
2-10 Calibration