Chapter 9 — Interference Analyzer, Option 25 9-9 Spectrum Menu
MS20xxA VNA Master UG 10580-00166 Rev. C 9-17
Field Strength
This measurement allows the use of an antenna with known gain characteristics and
measures the field strength over the frequency range of the antenna in units of
dBm/meter
2
, dbV/meter
2
, dBmV/meter
2
, dBµV/meter
2
, volts/meter, or watts/meter.
On/Off
Turns field strength measurements on or off.
Antenna
This soft key brings up a dialog box that lists all the antennas for which the
instrument has data, including both standard antennas and custom antenna that
have been added using Master Software Tools (Chapter 13). Use the Up/Down
arrow keys or the rotary knob to select the desired antenna and press
Enter.
Back
Returns to the previous menu.
OCC BW
Activates the occupied bandwidth menu. Select either % or dBc method of occupied
bandwidth measurement.
Method % Down/dBc Down
Select either the % of Power (default) or dB Down measurement method as
displayed in the message area.
%
Use the keypad, the directional arrow keys or the rotary knob to enter the
percent of power, from 0 to 99%.
dBc
Use the keypad, the directional arrow keys or the rotary knob to enter the dBc
value (0 dB to 100 dB).
Back
Returns to the previous menu.
Channel Power
Activates the Channel Power measurement function. Channel Power and Channel
Power Density are measured based on the selection in the Units menu.
On/Off
Begins or ends the channel power measurement. When the measurement is on,
Ch Pwr will appear below the display. The detection method will automatically be
changed to RMS Average when the measurement is started. The detection
method can be modified by pressing the
Shift and the Sweep keys and selecting
the
Detection soft key.
Center Freq
Activates the center frequency function, and sets the center frequency of the VNA
Master for the channel power measurement. Use the keypad, the directional
arrow keys or the rotary knob to enter the center frequency.
Ch Pwr Width
Sets the integration bandwidth for channel power measurement. Modifying this
value automatically adjusts the channel span to maintain the same ratio. Use the
10580-00166C.book Page 17 Thursday, February 21, 2008 12:52 PM
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