Fluke 540B - Battery Installation and Removal; Battery Check Calibration

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540B
4- 3. The
calibration procedures outlined under Peri-
odic Maintenance should be performed annually or
oftener to provide the most satisfactory service from
your Model 540B. The recommended test equipment is
listed in Figure 4-1.
4-4. BATTERY INSTALLATION AND RE· MOVAL
4- 5. Other tha .n the battery condition checks (para -
graph 2- 11) and recharging, routine power pack main -
tenance is limited to battery replacement . Due to the
advantage of being able to recharge the major battery
sections , routine maintenance is further limited to re-
placement of the me rcury reference battery, as re-
quired. Should it become necessa ry to replace any of
the recharg eable batteries, the following instructions
shoul d be used .
a. Remove the six screws indicated on the front panel
of the battery pack in Figure 3-4.
b. Sli de the angle bracket assembly to one side.
c. Carefully lift off one of the formed plastic battery
holders to allow access to the batter ies.
d. Re-assemble after battery replacement.
CAUTION!
Non-rechargeable batteries should always
be removed from the 540B if they fail the
battery check, if the instrument is to be
shipped,
or if the instrument is to be stored
for extended periods of time.
4-6. BATTERY CH ECK CALIBRATION
4-7. Each battery section of the Model 540B (REFER-
ENCE, GALV, and SEARCH)
has a correspo nding cir-
cuit t hat allows th e PERCE NT INPUT METER to indi-
cate the condition of each battery section. Calibra tion
of these circuits constitutes the setting of th ei r adjust-
ments, such that a low battery condition indication is
esta blished on the PERCENT INPUT m eter scale, at the
lower end of the green BAT OK band. These adjust -
ments are set at the factory and should normally never
have to be adjusted. Should a situation arise in which
you feel
that these circuits should be re -c alibrated, use
the following procedure for Model 540B ' s containing
mercury battery packs. Should your Model 540B contain
the Model 540B-110 Rechargeable Battery Pack, refer
to paragraph 4-8.
a. Model 540B POWER switch to OFF.
b. Remove the battery pack from the rear of the Model
540B.
c. Remove the battery hold down clamps and take out
all of the batteries .
d. Conn
ect 1. 0 volt (±10 mv) de between pin s 7(- ) and
5(+) on
the battery pack printed circ uit board.
4-2
e. POWER switch to REFERENCE.
f. Adjust R462 (see Figure 4- 2) for a PERCENT IN-
PUT
meter indication at the lower limit of the BAT
OK band.
g. POWER
switch to OFF. Remove connections.
h. Connect
11.5 volts (±100 mv) de between pins 2(-)
and 1(+).
i. POWER switch to GALV.
j . Adjust R461 (see Figure 4-2) for a PERCE NT IN-
PUT
meter indication at the lower limit of the BAT
OK band.
k.
POWER switch to O FF . Remove connections.
l. Connect 11.5 volts (±100 mv) de between pins 3(-)
and 4(+).
m . POWER
switch to SEARCH.
n. Adjust R460
(see Figure 4- 2) for a PERCE NT IN-
PUT meter indication at the lower limit of the BAT
OK band.
o. POW ER switch to OFF. Remove connections.
p. Install batter ies and remount the battery pack in
the Model 540B. (For the rechargeable battery
pack, re-solder the corresponding wires to pins 1
and 4, install the 1. 35 volt battery, and remount
the battery pack. )
4-8. If your Model 540B contains the recharg eable
battery pack, use the procedure of paragraph 4-7, sub-
stituting the following steps for step c of the calibration
procedure.
a. Remove the 1. 35 volt battery.
b. Unsolder the wire from the Model 540B wire har-
ness at p in 1 of the rechargeable battery pa ck's
printed circuit board . Trea t thi s wir e as pin 1 in
th e following calibra tion proce dure.
c. Unsolder the wire from the Model 540B wire har -
ness at pin 4 of the rechargeable battery pack's
printed circu it board. Treat this wir e as pin 4 in
the following calibratio n procedur e.
Figure 4-2. BATTERY CHECK CALIBRATION ADJUSTMENTS
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