Battery Replacement
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.
The internal battery powers the real-time clock. The primary function of the clock it to provide a time
stamp for the internal file system. If the battery fails, the clock and time stamp function will not be
available. No other instrument functions are affected.
Under normal use at room temperature, the lithium battery has a life expectancy between seven and
ten years. Note that battery life will be reduced if the instrument is stored for a prolonged period at
temperatures above 40 degrees C.
The part number of the battery is Panasonic CR 2032.
Installing the Instrument
1. Remove the instrument cover as described under Disassembly.
2. The battery is located near the calibration switches, under two ribbon cables.
3. To access the battery, release the ribbon cables by pulling up on the locking tab.
8 Service and Maintenance
350 Keysight N6900/N7900 Series Operating and Service Guide
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