16
CAUTION
Do not force the connection beyond the elastic limits
of the connectors. Great force is not required. If
making the connection seems difficult, withdraw
and examine the connector and socket for damage.
3.2.3 Power Up
During shipping and storage, it is likely that batteries
have become discharged. Allow the AC adaptor to charge
the batteries for at least 5 minutes before turning the
power meter slide switch to
1
or
B
. Low batteries can
cause non-fatal logic errors during turn on sequence.
Turn on the instrument by sliding the switch on the side
of the instrument to the
1
position. At power-up the
Model 840-C first performs a display segment-test. All
segments and annunciators of the liquid crystal display
(LCD) are momentarily turned on (approx. 3 sec.) for
visual confirmation by the user (See Figure 4). If the
display is blank, then turn 840-C off. Press the reset
switch located in the back of the 840-C, using a non-
conductive tool. Turn the 840-C on.
B
1
0
AUTO
RECALL
n
µ
mW
dBm
S
M
F
P-P
nm
S/N
H
+
Figure 4 LCD Display
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