WILLTEK 4400 Mobile Phone Tester Series, Руководство пользователя

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Chapter 2 GSM Call Mode Operation
GSM tests
4460 GSM System Option and 4468 EDGE System Option Version 12.20
85
ACPM modulation spectrum measurement
On the
MHz
selection fields, you set the markers to the required horizontal posi-
tions (= offset from the carrier in MHz).
The corresponding result fields (
dBc
) show the measurement values obtained for
the two positions relative to the RF power level of the carrier.
The third row shows the difference between the selected frequencies and the
difference between the two corresponding measurement values.
ACPM transient spectrum measurement
On the
MHz
selection fields, you set the markers to the required horizontal posi-
tions (= offset from the carrier in MHz).
The corresponding result fields (
dBm
) show the measurement values obtained for
the two positions in dBm.
The third row shows the difference between the selected frequencies and the
difference between the two corresponding measurement values.
Parameters and status On the spectrum analyzer menus, the following parameters and status informa-
tion will be displayed:
NOTE
A selection of an offset frequency marked with a – behind (e.g. –
0.6-
) means
the related offset frequency minus 30 kHz , while a
+
marker means the
related offset frequency plus 30 kHz . A setting of e.g. –
0.6-
would then
mean that the frequency to be measured at is –630 kHz from the carrier.
NOTE
These parameters and status information is only relevant when working in
synchronous mode (i.e. when a traffic channel has been set up). When mea-
suring in asynchronous mode (i.e. without call setup), all display fields
described here have no meaning at all.