HP 8921A User Manual page 248

Chapter 8, Signaling Decoder Screen
Function Generator Decoder
Arm Meas
Frequency
Gate Time
Input Level
248
Arm measurement prepares the decoder to be triggered by an incoming signal
when making single measurements.
This measurement displays the decoded signal's frequency.
This field specifies the minimum time the decoder analyzes a signal after it has
been triggered.
This field specifies the signal level that you input (after de-emphasis if it is turned
on). 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 fluctuating signal levels.
If de-emphasis is used (by setting the AF Analyzer's
), the
750 s Input Level
level. For example, a 1 kHz, 1 Vpeak sinewave into the AF Analyzer's input
requires an
Input Level
See Also
Trig Level field description, on page 254
AF Anl In
should be set to about 1/5 of the measured signal's
of approximately 0.212 V to trigger correctly.
setting.
field to
De-Emphasis