Sweep Acquisition - Agilent Technologies FieldFox N9912A User Manual

Sweep Acquisition

When set to Auto, Sweep Acquisition is set to the minimum value required with
the current settings in order to achieve amplitude accuracy when measuring CW
signals yielding the fastest sweep update rate.
However, you can adjust this setting in order to increase the probability of
intercepting and viewing pulsed RF signals.
For example, with SwpAcquisition set to Auto a pulsed GSM signal is NOT
visible on the FieldFox screen, as shown in a blue trace in the following image.
However, while watching the trace, increase the SwpAcquisition value until the
pulse spectrum rises out of the noise and reaches its maximum level. Increasing
the SwpAcquisition value beyond this point only slows the update rate (increases
the actual Sweep time readout) but does not improve measurement quality.
How to set Sweep Acquisition Parameter
 Press Sweep 3.
 Then
 Then choose from the following:
74
The FieldFox uses Step sweep type regardless of the Res BW. This is
Step
o
useful for capturing impulsive noise that may be generated from nearby
electrical equipment.
A GSM signal in a framed data format; timeslot zero ON; all others OFF;
PRF = 218Hz, Duty Cycle = 12.5%. The pulsed signal becomes visible on every sweep
SwpAcquistion Auto
Auto Sweep is set to the fastest sweep possible with the current settings.
o
Man Enter a relative acquisition value between 1 and 5000, where:
o
o 1 = Fastest sweep possible
o 5,000 = Slowest sweep possible
update with SwpAcquisition = 50.
Man.
N9912A FieldFox User's Guide