Keithley 2700, Service Manual

Page: 61 / 174

Calibration 2-13
Remote calibration
Follow the steps in this section to perform comprehensive procedures via remote. See
Appendix B for a detailed list and description of remote calibration commands.
When sending calibration commands, be sure that the Model 2700 completes each step
before sending the next command. You can do so either by observing the front panel CALI-
BRATING message, or by detecting the completion of each step over the bus. (See “Detecting
calibration step completion” in Appendix B.)
The procedures for calibrating the Model 2700 via remote include:
• Preparing the Model 2700 for calibration
• Front panel short and open calibration
• DC volts calibration
• Resistance calibration
• DC current calibration
• AC volts calibration
• AC current calibration
• Programming calibration dates
• Saving calibration constants
• Locking out calibration
NOTE As with front panel calibration, you can choose to perform comprehensive, DC-only,
or AC-only calibration. Be sure to include a space character between each command
and parameter.
Preparing the Model 2700 for calibration
1. Connect the Model 2700 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 9-25-pin
adapter if necessary).
2. Turn on the Model 2700, and allow it to warm up for at least two hours before perform-
ing calibration.
3. Make sure the primary address of the Model 2700 is the same as the address specified
in the program that you will be using to send commands. (Use the GPIB key.)
4. Unlock the calibration function by sending this command:
:CAL:PROT:CODE 'KI002700'
(The above command shows the default code, KI002700. Substitute the correct code if
changed.)
5. Send the following command to initiate calibration:
:CAL:PROT:INIT