Ludlum Measurements 177, Руководство пользователя

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Model 177
Technical Manual
Section 4
Ludlum Measurements, Inc. Page 4-1 October 2018
Description of Controls and
Functions
Front Panel
Power ON-OFF Switch:
provides 9 Vdc through a wall transformer to the
instrument and trickle-charges the standby battery. In case of line power
failure, the battery automatically comes on-line to power the instrument.
The battery will provide up to 50 hours of operation.
Note:
To recharge the battery, the
ON
-
OFF
switch must be in the
ON
position.
Power-on Lamp:
a red lamp that comes on when power is supplied to the
instrument.
VOLUME Control:
varies the volume of the audio output through the
unimorph speaker. This control has minimal effect on the audio when the
alarm is activated.
Audio Speaker:
a unimorph speaker, located behind the front panel.
ALARM Lamp:
a red lamp that comes on when the alarm threshold has
been exceeded. The lamp will remain on (unless the alarm is configured to
“non-latching”) until the reset button is depressed, driving the meter
needle below the alarm threshold.
RANGE Selector Switch:
a four-position switch providing range
multipliers of X1K, X100, X10, and X1. With a scale (meter face) of 0-500
CPM, the full range of the instrument is 0 to 500,000 CPM .
Ratemeter:
a four-decade linear meter with ranges of 0-500, 0-5000,
0-50,000, 0-500,000 CPM. Other meter faces are available depending on
the application. Readout is on a 6.4 cm (2.5 in.) scale panel meter. A
separate scale is provided for battery check and high voltage readout.
Section
4