Marker Frequency.1-23; Mkr - HP 3325B Operating Manual

Operation and Reference
Minimum times are:
Single Linear Sweep 0.01 Os
Continuous Linear Sweep 0.01 Os
Single Log Sweep
1
.OOOS
Continuous Log Sweep 0.10Os
When the enhancements are turned off, single log-sweep sweep time is increased
by the processing time required between segments. The time increase (in
seconds) is approximately equal to:
Time Increase = 0.045[10 log{stopfreq. start freq.)]
Marker Frequency
The marker is a TTL-compatible signal on a rear-panel connector that goes
low at the specified marker frequency during linear up-sweeps. It may also
be used with discrete sweeps where it operates while sweeping up or down.
The OVlkr Freq] (marker frequency) key enables display, entry, or modification of the sweep
mariner frequency. The indicator adjacent to the [Mkr Freq] key illuminates when the
marker frequency value is displayed. The displayed frequency value is changed with the
entry and units keys, or with the modify keys. The MHz, kHz, and Hz units allow convenient
entiy of frequency values. Frequency resolution is 1 p.Hz for frequencies below 100 kHz and
1 mHz for frequencies above 100 kHz.
Mkr
Freq
a marker signal to be generated, the marker frequency may be set to any point within
the sweep band to within approximately 400 of the stop frequency. If the marker
frequency is set beyond this point, the stop frequency is automatically increased so that the
marker pulse is approximately 400 ^s wide. The following equation may be used to determine
the approximate maximum marker frequency:
Max marker freq. = stop freq. — (0.0004 x bandwidth -r- sweep time)
The marker signal is not generated on the down-sweep of a continuous sweep.
See the discussion, later in this chapter, on the marker, Z-blank, and X-drive
rear-pane! outputs.
Mkr CF
n [Mkr-9-CF] (marker into center frequency) key centers the sweep band
frequency value of the marker parameter. The [Mkr-*>CF] key is
M.r-cF selected by pressing the blue [Shift] key followed by the [Mkr Freq] key.
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