Multitone RPR 583, Technical Manual

Page: 69 / 91

GENERATOR
SIGNAL
PC
RF IN
10dB
ATTENUATOR
P645
TAG11331-1
DATA
NOTE: THE DISTANCE BETWEEN THE
PC AND THE P671A MUST BE
GREATER THAN TWO METRES
RPR 583
TM1212 Issue 1 Page 5 - 25
Fig. 5.14: Configuration for Coarse Sensitivity Measurement
5.8.3 Pager Sensitivity Measurement (Coarse)
To determine the pager sensitivity, configure the test equipment as shown in
Figure 5.14 and do the procedure given in sub-paragraphs a) through e).
NOTE: This is only an indication of sensitivity, which is dependant on the unit under
test being in a noise free environment.
a) Set the signal generator to the channel frequency, at a deviation of 4.5kHz and
an output level of -85dBm.
b) Install a known good battery in the pager and switch it ON.
c) Put the pager in the P671A and send a sensitivity call from the P645. Increase
the signal generator output level, if necessary, to obtain a correctly received
call.
d) Reduce the RF level in 1dB steps until the pager receives less than three calls
in five.
e) Increase the RF level in 1dB steps until five consecutive calls are received. An
output level of -98dBm should be achieved.
5.8.4 Pager Sensitivity Measurement (Fine)
Configure the equipment as described in paragraph 5.8.3 but connect a P800 TEM
cell instead of the P671A. Follow the steps given in the TEM Cell Instructions for the
IEC method. Place the pager in the polystyrene block (refer to Figure 5.15)
positioned centrally in the TEM Cell, with the display facing the input end. A level of
-103dBm or better should be achieved.