Anritsu MS2024A/MS2026A User Manual page 106

3-7 VNA Key Functions - Sweep Menu
RF Immunity
Press the soft key to select
technique to improve immunity to interfering signals. Selecting
dithering on. Selecting
Selecting RF Immunity Normal reduces sweep time (increases sweep speed) for both
frequency and DTF measurements. In a controlled environment, this reduced
immunity should not be a problem. In the field however, there can be stray signals from
nearby or co-located transmitters that can affect frequency and DTF measurements.
Making the same measurement with RF Immunity set to both High and Normal with
no appreciable difference between the two settings is a good indicator that it is safe to
make the measurements with RF Immunity set to Normal.
Data Points
Press the soft key to select
before or after calibration. The VNA Master uses the highest setting of 551 data points
for calibration regardless of the display setting.
Power
With 2-port measurements, the power level can be changed between High and Low
output power. Press the soft key to select
allows for 2-port measurements where the output level could saturate an active device,
such as an amplifier. High (approximately 0 dBm), can be used for all other
measurements. Output power levels can only be changed for 2-port measurements. The
power level is set to High for 1-port measurements.
Bias Tee
The Variable Bias Tee Option (Option 10) is available for all models of the VNA Master.
In addition to this section, refer to
associated "Example 2" on page
The built-in variable power supply can be turned on as needed to place between +12V
and +24V on the center conductor of the
current can be set to
current and voltage information that can be stored as well.
Press the
Bias Tee
Bias Tee On/Off
This soft key toggles the bias tee function On and Off.
Bias Tee Voltage # #.# V
Allows entry of the Bias Tee voltage to be placed on the center conductor of the
RF In port. Values can be between 12.0 and 24.0 V in increments of 0.1 V.
Current Low/High
This soft key toggles the bias tee current between Low and High.
Back
Use this soft key to return to the Sweep menu.
Averaging Smoothing
This soft key opens the Averaging menu.
Averaging On/Off
This soft key toggles between averaging and no averaging.
3-52
or
High Normal
turns the dithering off.
Normal
, or
137 275
"2-Port Gain Measurements" on page 3-19
3-20.
or . The status window to the left of the display shows the
Low High
soft key to open the Bias Tee menu.
Chapter 3 — Vector Network Analyzer
. The VNA Master uses a special dithering
data points. The resolution can be changed
551
or . Low (approximately -35 dBm)
High Low
port. For +12V and +15V settings, the
RF In
MS20xxA VNA Master UG 10580-00166 Rev. C
turns the
High
and the