Calibration Switches
SHOCK HAZARD Only qualified, service-trained personnel who are aware of the
hazards involved should remove instrument covers. Always disconnect the power
cable and any external circuits before removing the instrument cover.Some circuits
are active and have power for a short time even when the power switch is turned off.
Two switches control the access to calibration commands. The switches are on the interface board
and are accessible by removing the top cover. To access the calibration switches:
Accessing the Calibration Switch
1. Remove the instrument cover as described under Disassembly.
2. The calibration switch is on the interface board near the ribbon cable. To change the calibration
switch settings, use a small screwdriver to move the switches. As shipped, all switches are set
toward the ON position (see below).
3. Replace the top cover when finished.
Do not use a pencil to move the switches. Any graphite dust that gets on the
switches will conduct electricity.
Switch Functions
Switches 1 and 2 set the calibration configuration as follows. Switches 3 and 4 are not used.
Switch 1 Switch 2 Description
Normal ON ON This is the 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 admin/calibration password is resetto 0 when the instrument is first powered
on. Use this setting if you have forgotten the password.
Inhibit
Calibration
ON OFF All calibration commands are disabled. This is useful where access is guarded by
instrument seals.
Keysight N6900/N7900 Series Operating and Service Guide 349
8 Service and Maintenance
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