DETAILED CPM-700 PROCEDURE
19
REI
CPM-700
DETAILED CPM-700 PROCEDURE
METER CALIBRATION
The CPM-700 utilizes high performance components and temperature
compensation to provide stable, accurate operation. Due to the high
system gain, changes in temperature, humidity or component aging may
require the CPM to be adjusted periodically.
Meter Calibration is performed by plugging the VLF Probe into the CPM
Probe Input (this selects the Probe Input).
NOTE: Do not plug the VLF into any outlets during this adjustment.
Adjust the Meter Calibration Control on the side panel, using a small flat-
blade screwdriver, until the display reads two to three segments on the High
Gain setting.
KNOWN SOUND SOURCE
A “Known Sound Source” provides two very important functions.
1.
It “masks” most of the inspection noises made during a physical
search.
2.
It gives a recognizable sound within the sweep area, which, when
received through the CPM-700, will identify the existence of a
surveillance device (
Caution
: If a
digital
transmitter is present, you
will hear audio variation based on the type of digital modulation,
but you will
NOT hear the known sound source through the CPM.)
Any CD or MP3 player will provide a Known Sound Source within the
sweep area, but usually a unit with medium size speakers will give the best
results.
Choose a sound source that is normal or appropriate for the environment
being inspected (i.e. music may not be normal to a business setting, etc).
Bring a sufficient quantity, since a quality sweep includes a physical search,
which may take many hours.
Note:
Do not use a radio as a Known Sound Source since it is possible to
receive the same station through the CPM-700. This would falsely indicate
the radio station’s signal is a surveillance device.