Agilent Technologies FieldFox N9913A User Manual page 132

CAUTION
Frequency/ Span / Step
Valid CPM measurements can be made over the entire frequency range of the
FieldFox. Although it is possible to enter a center frequency below the FieldFox
minimum frequency, the LO feed-thru of the internal SA hardware will invalidate
these CPM measurements.
The measurement span (also known as Channel Width and Integration BW) is the
frequency range, half above and half below the center frequency, over which
power is detected and displayed. The maximum measurement span is 100 MHz.
A Radio Standard can also be used to set the center frequency and span. Learn
more about Radio Standards on page 78.
How to enter center frequency, step size, and span
The default frequency is 50 MHz.
 Press Freq/Dist or Meas Setup 4 .
 Then Frequency.
 Then
 Then type a value using the numeric keypad. Then press a multiplier key.
 Optionally, use the ▲|▼ arrows to quickly change Center frequency. The size
 Optionally press
Attenuation
The Attenuation setting controls the power level into the FieldFox.
To compare CPM mode measurements to SA Channel Power measurements, use
the same attenuation settings. CPM mode defaults to 30 dB attenuation, while SA
mode defaults to 10 dB attention. In CPM mode, the attenuation setting is NOT
annotated on the screen.
How to set Attenuation
 Press Scale/Amptd
 Then
 Then
132
Please observe the RF IN port damage level.
+27 dBm (320 mW) average
+33 dBm peak (2 W) <10μs
+50 VDC
Center
Learn about multiplier abbreviations on page 19. The current frequency (f) is
shown on the FieldFox screen.
of the frequency step can also be changed. Press
value using the numeric keypad, then select a multiplier key.
Span (Ch Wid)
press a multiplier key. The default span is 2 MHz. The maximum span is 100
MHz. The current span setting is shown as the dividend in the digital display.
For example: -10 dBm / 1.00 MHz
More
Internal Atten
CF Step
Type a value using the numeric keypad. Then
then type a step size
FieldFox User's Guide