HP 8921A User Manual page 233

Gate Time
Input Level
Number of Pages
This field specifies how long the decoder analyzes a signal after it has been
triggered. Up to 65 seconds of gate time can be specified. The minimum gate time
should be set long enough to allow the preamble and all necessary data bits to be
captured.
If too much data is decoded during the gate time, the decoder buffer will overflow
(an error message is displayed when this happens). Decrease the gate time if this
error is displayed.
Enter the expected data signal level in this field. The higher the level of signal
expected by the analyzer, the higher the trigger level is set.
Operating Considerations
The unit-of-measure is determined by the
The input level should be set high enough to prevent false triggering, but low
enough to allow triggering for valid signals (typically about 3 kHz).
De-emphasis should not be used with this signaling format. Access the AF
ANALYZER screen and set the
See Also
Trig Level field description, on page 234
See the
Display Page field description, on page 232
Chapter 8, Signaling Decoder Screen
AF Anl In
field setting to
De-Emphasis
Digital Paging Decoder
setting.
.
Off
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