
Model 4525 Gate Monitor
Operator’s Manual
Ludlum Measurements, Inc.
Page 74
May 2018
RPM Operation
This section is dedicated to the operation of the RPM apart from the system
computer and software, except where noted.
Controls and Functions
The following is a description of the controls and functions on the electronics
panel, which is housed within the master detector enclosure.
READOUT
: Liquid Crystal Display (LCD), 4-line by 20-character
alphanumeric display, backlit while on AC power. Setup information,
background, and count data is displayed.
ENTER
Key
: Selects or advances the display. If the
ENTER
key is pressed
while turning the instrument on, the Model 4525 is loaded with a set of
default parameters.
LINE FUSE
: Fuse to limit current from the AC mains input. The fuse is
250 Vac at 1A (AGC1) or equivalent.
BAT FUSE
: Fuse to limit current from the battery. The fuse is 10A
(ABC10) or equivalent.
Mains Supply
: Line Voltage input of 100-240 Vac, 50-60 Hz, 250 W.
BATTERY
: Back-up power is provided by a 12 V, 12 amp/hr battery.
Power on Self Test (POST)
When the RPM is first powered up, all relays, lights, and audio devices are
momentarily activated. This POST is done in order to give the user an
opportunity to ensure that all applicable devices are working. The test lasts
for about three seconds and may be activated anytime by pressing the
RESET
button for greater than five seconds, or by selecting the Reboot function
within the software (Set Parameters window).
After POST, the system will establish the level of background radiation. On
the remote display, the
POWER OK
indicator turns on, and the
CHECKING
indicator blinks for 30 seconds. At the end of the background update, the
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