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.
Accessing the Calibration Switch
1. Remove the instrument covers as described under Disassembly.
2. To change the calibration switch settings, use a small screwdriver to move the switches. As
shipped, all switches are set toward the ON position (refer to the ON label on the switch).
The red arrow shows which
way to slide switch 2 to turn it off.
Do not use a pencil to move the switches. Any graphite dust that gets on the
switches will conduct electricity.
3. Replace the top cover when finished.
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 calibration password is reset to 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 instru-
ment seals.
Keysight MP4300 Series Operating and Service Guide 187
7 Service and Maintenance
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