9-2 Spectrogram Measurement Chapter 9 — Interference Analyzer, Option 25
9-2 MS20xxA VNA Master UG 10580-00166 Rev. C
7. Press the Measurements function hard key and the Spectrogram soft key twice.
8. Set the time between sweeps by selecting the
Sweep Interval soft key, or set the total time
for a full spectrogram by selecting the
Time Span soft key.
9. To change the time between sweeps, press the
Sweep Interval soft key and use the rotary
knob or keypad to set the time from 0 seconds to 660 seconds. Entering the time
interval value causes the corresponding time span value to be automatically computed.
The time span can be viewed or changed by selecting the Time Span soft key and using
the rotary knob or keypad to set the span. As expected, changing the time span will
automatically change the sweep interval.
10. To set the total time span for a complete display, press the
Time Span soft key and use the
rotary knob or keypad to enter a time between 1 and 4320 minutes (72 hours). Entering
a time span value causes the corresponding sweep interval value to be automatically
computed and shown when the
Sweep Interval soft key is pressed.
11. The instrument can be set so that spectrogram plots can be automatically saved when
the display is full. Press the
Auto Save soft key to toggle auto save On or Off.
12. The
Time Cursor soft key is used to turn on the horizontal time cursor. Use the Up/Down arrow key to
move the cursor vertically through the spectrogram. The date and time that the measurement at the
cursor position was taken is displayed at the top of the screen.
Note
Setting a Sweep Interval value >0 will change the detection method to Max Hold,
so that any event within the time interval will be captured to the screen. This allows
for extended measurement times to be set.
Note
When the Time Cursor is activated and not on the zero trace position, the unit will
automatically stop making measurements
10580-00166C.book Page 2 Thursday, February 21, 2008 12:52 PM
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