PRAXSYM PAMS, User Manual, Page: 12 / 20

Page 11
Control Lock
Once set, the controls of the transmitter can be locked to prevent
inadvertently changing a setting that could result in measurement
errors. Depress the LOCK button on the top of the transmitter to
toggle the lock feature on/off.
3.3 Making Shield Level measurements

Before making shield level measurements, turn on the
transmitter and receiver, tune both units to the test frequency,
set the output of the transmitter to 60 dB attenuation, allow
both units to warm up for 5 minutes.

With the receiver in Signal Strength mode, monitor the test
frequency to ensure no interfering signal is present on your test
frequency.

When making measurements in an unfamiliar area, set the
receiver to Spectrum Monitor mode to determine frequencies in
the spectrum that are clear to use for testing your shielded
enclosure.
The 60 dB shielding level indication offsets the 60 dB output
attenuation on the transmitter. By placing the transmitter and
receiver 4-5 feet apart, approximately 30 dB of free space path loss
exists. When calibrating the units, the receiver has been designed
to account for this amount of path loss in conjunction with the 60
dB of attenuation given by the transmitter. Thus, when the
attenuation is removed from the transmitter, the receiver will read
very close to 0 dB shield level.