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S:\agilent\e8285\REFGUIDE\MANUAL\fields.chp
Chapter 4, Description of Fields
Fields
FM Deviation
This is the default measurement for this field. The FM Deviation field displays the
frequency deviation between the FM signal and the carrier. The FM Deviation
measurement field is only displayed when the
AF Anl In field is set to FM
Demod
or FM Mod.
See Also
Atten Hold
field description, on page 169
AF Anl In
field description, on page 155
Screens Where Field is Present
DUPLEX TEST
ANALOG MEAS
AF ANALYZER
RF ANALYZER
RF GENERATOR
TX TEST
FM Deviation (Call Control)
This field displays the measured FM deviation of the carrier being transmitted by
the mobile station. Four dashes (----) indicate that no carrier is present to measure.
See “Measure” in the GPIB Command Syntax chapter of the E8285A Condensed
Programming Reference Guide for programming command syntax.
A numeric value would only be displayed in the connected state (that is, the
Connected annunciator is lit). The FM Deviation field is only displayed when
the
Display field is set to Meas.
Refer to the
"Display" field on page 223 for information on how to read
measurement results from this field.
When the
CALL CONTROL screen is displayed, the Test Set’s instrumentation is
configured for optimal performance of the signaling decoder. Two characteristics
of the instrumentation which have a significant affect on the performance of the
signaling decoder are: 1) audio frequency gain and 2) post detection filtering.
While the
CALL CONTROL screen is displayed the audio frequency gain stages are
fixed (that is, autoranging is tuned off). This is necessary to ensure that no
signaling bursts are missed as a result of the audio gain stages autoranging in
response to a burst of signaling data. Fixing the audio gain stages may result in a
slight accuracy degradation for FM deviation measurements less than 7 kHz.