58452 VXIbus Universal Power Meter
5-2
Publication 21555, Rev. E, September 2002
5.3
Lithium Battery
The power meter contains a 3.6 V lithium battery to maintain the test setups and calibration data when
the unit is turned off. This battery should last in excess of five years. To check the battery, connect a
voltmeter between A2TP1 and the frame of the instrument.
Battery replacement is recommended every three years or sooner if the battery voltage drops below
3.1 V. The lithium battery should be removed if the instrument is to be placed in long-term storage of
two years or more.
The battery can be replaced without losing the data stored in RAM if the old battery is removed and the
new battery installed in less than 10 seconds with main power off, or if power is left on while changing
the batteries.
Since this procedure requires removing the cover from the in-
strument and restoring power before removing the battery, it
should be performed only by qualified personnel.
Lithium batteries can supply substantial current and depending on factors such as the state of charge,
can overheat when shorted.
The following replacement procedure is intended for users knowledgeable in the use and care of
equipment using non-rechargeable lithium batteries.
Recommended Replacement Battery: Tadiran Type TL-5242, Giga-tronics P/N 21212.
5.3.1
Replacement Procedure: D
1.
Turn OFF the 58542.
2.
Remove the cover.
3.
Note the orientation of the battery, which is located on the side of the analog input cover. The
battery is held in place with a hook and loop fastener. Peel the battery free of the PC board.
4.
Turn the 58542 on to maintain memory power while replacing the battery. The 58542 can be
turned off while changing the battery, but install the new battery within ten seconds to avoid
losing RAM data.
5.
Disconnect the battery wires. The connector is polarized so it can be inserted only one way,
with the red wire toward the rear of the instrument.
6.
Install the new battery and connect the wires.
7.
Turn the 58542 off and measure the battery voltage between TP13 (common) and TP17 (bat).
It must be at least 3.6 V.
8.
Connect a voltmeter between A2TP1 & TP2. The voltage must settle to <3 mV. If above this
level, the battery life will be shortened. The only load on the battery is the static RAM. It
might be necessary to find out which chip is drawing too much current, and replace it if the
current is excessive.
9.
Replace the cover and secure.
CAUTION
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