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140 Chapter 5
Analog Measurements - Screens and Control Fields
Mod In To No Pk/Avg
Mod In To
This modulation input field defines how an external modulation source
is used with the RF generator. Two fields are used:
• The upper field determines whether the ANALOG MODULATION
IN signal is set for AM or FM modulation of the RF GENERATOR.
• The lower field sets the modulation sensitivity. For instance, if FM
(/Vpk) is selected for the upper field, and you set the lower field to
1.0000 kHz, the RF generator will deviate 1 kHz for every 1 Volt
peak at the ANALOG MODULATION IN connector.
Screens on which this field is displayed
RF GENERATOR
No Pk/Avg
This field performs two functions:
Pk Hold (peak hold) prevents the spectrum analyzer from erasing the
previous trace each time it sweeps. This causes the traces to ‘build-up’
on the screen until Off, No Pk/Avg or measurement reset (using
Meas
Reset
(press and release the Shift key, then the Hold key) is performed.
This allows the capture of transient signals that are not displayed long
enough to view during normal operation.
Avg 1 through 100 (video averaging) enables the spectrum analyzer to
display a trace representing the average of several measurements. The
number of samples used for measurement averaging range from 1 to
100 (see below). No Pk/Avg and Off function identically. Off is
provided to maintain backwards compatibility with earlier firmware
and software.
• No Pk/Avg means that peak hold and video averaging are off.
• Pk Hold means that peak hold is on.
• Avg [n] enables video averaging over [n] measurements,
where n = 1, 2, 3, 4, 5, 10, 20, 50, or 100
• Off means that peak hold and video averaging are off.
Operating Considerations
After capturing the desired signal, you can use the hold function (press
Hold key) to prevent additional signals from building-up on the display.
Screens on which this field is displayed
SPEC ANL: auxiliary controls menu
Main Menu