Calibration
Series N6700 User’s Guide
133
Calibration
Refer to the “Equipment Required” section in this appendix for a list
of the equipment required for calibration. A general outline of the
procedure is as follows:
Enter the calibration mode by providing the correct password.
The password is set at the factory to 0 (zero). You can change the
password once calibration mode is entered. The password must
be numeric, and can be up to 15 digits in length. lf the password
is incorrect, an error occurs. If the active password is lost, the
calibration function can be recovered by setting an internal
switch that resets the password to 0. If the message “Calibration
is inhibited by switch setting” appears, the internal switch is set
to prevent the calibration from being changed.
Calibrate only ONE channel at a time. The calibration commands
accept only a single channel number for the channel parameter.
When calibrating the unit using SCPI commands, most steps
involve sending a *OPC? query to synchronize with the power
system’s command completion before proceeding. The response
from the instrument must be read each time *OPC? is given.
You do not have to do a complete calibration. You may calibrate
only the voltage or current portion and then save the constants.
However,
the voltage or current calibration sequence must be
performed in the order shown in this appendix in its entirety.
As each calibration sequence is completed, the instrument
calculates new calibration constants and begins using them.
However, these constants are not saved in nonvolatile memory
until a SAVE command is explicitly given.
Exit the calibration mode. Any channels that were calibrated but
not saved revert to their previous calibration constants. Note that
an *RST command also sets the calibration state to OFF.
Calibration Switches
Two switches control the access to calibration commands. The
switches are on the carrier board and are accessible by removing the
top cover. Refer to the Disassembly Instructions in Appendix D.
Switches 1 and 2 set the calibration configuration as follows:
Sw 1
Sw 2
Description
Normal
ON
ON
This is the default or as-shipped switch setting. The calibration
functions are accessible after entering a numeric password. The
default password is 0 (zero).
Clear
password
OFF
ON
The calibration password is reset to 0 when the instrument is first
powered on. Use this setting if you have forgotten the password.
Inhibit
calibration
OFF
OFF
All calibration commands are disabled. This is useful where
calibration access is guarded by instrument seals.
