Maintenance—DM 5010
Input
Switch Assembly
For
access
to the
input
switch,
remove the ADC board
(A17)
from the
instrument. Then, remove the input connec
tor
assembly mounting nut and screw, and remove the
guard
shield. Refer to Fig. 7-4. Unsolder the wires to the
switch.
Next, remove the two screws in the back of the
input
connector
assembly and remove the plate. The switch
can
now be removed. Be careful not to lose the actuator
and
spring located
inside the
input connector assembly.
Reinstall
the
guard switch and input connector assembly in
reverse
order.
Adjusting
C1301 and
C1404
If the transformer
is replaced,
the adjustment of C1301
and C1404 should
be checked. To accomplish this, place
the Isolation
board (A15) on
an extender board and connect
the plug-in
to the power module via
a flexible extender ca
ble. The recommended equipment is listed below:
Oscilloscope
TEKTRONIX
7603
Dual Trace Amplifier
TEKTRONIX 7A18
Time Base
TEKTRONIX
7B50A
a. Connect
the DM 5010 HIGH input connector to the
LOW connector. Connect the oscilloscope as shown in Fig.
7-5.
Apply power to the power
module.
b. ADJUST
—C1301
for minimum amplitude of the dis
played
square
wave
(=33 µS period). Refer to Fig. 7-6.
c.
Add
a
connection from the DM 5010 GUARD connec
tor
to
the DM 5010
chassis
ground.
d. ADJUST—C1404 for minimum
amplitude of the dis
played
square
wave.
e. Remove all connections to the DM 5010
and turn off
the
power
module. Reinstall the Isolation
board
in the plug
in.
Battery Replacement
The recommended interval for battery replacement is ap
proximately
two years.
NOTE
Disconnecting
the
battery causes the loss of calibra
tion factors
stored in memory. Battery replacement
must be followed
by a 24-hour
period
of operation and
then
performance of the Adjustment
Procedure.
For access to the
battery,
unplug the ribbon cable con
nector
from
the Front
Panel
Driver board and remove the
CPU
board (A14). The battery is located
in the rear, bottom
corner
of the board. Unsolder the battery ears from the
wires
attached
to the circuit board. Use diagonal pliers to
cut
the two plastic straps
holding the battery in position.
Place
the
new battery in the circuit
board cutout with correct
polarity. Fasten
new plastic straps around the
battery
and
through
the circuit board holes. Solder the battery ears to
the
circuit board wires.
Power
up the
instrument for about 24 hours to properly
charge
the battery. Then, perform the Adjustment Proce
dure
to
restore calibration factors to
instrument memory.
2994-35
Fig.
7-5, Setup
tor C1301
and C1404 adjustment.
7-4
Summary of Contents for DM 5010
Page 14: ...DM 5010 2994 00 DM 5010 Programmable Digital Multimeter xii ADD JUL 1986...
Page 27: ...Operating Instructions DM 5010 2994 03 Fig 2 3 DM 5010 front panel controls and connectors 2 3...
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Page 251: ...Section 8 DM 5010 OPTIONS No options are available 8 1...
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