3-30 PN: 10580-00321 Rev. M S331L UG
3-6 Measurement Setup Cable and Antenna Measurements
Run/Hold
This key is used to start and stop line sweeping. When the Sweep Type
is set to Single mode, this key triggers a single sweep.
1. Press the Sweep (3) menu key.
2. Press Run/Hold to start or stop the line sweep.
Sweep Type
Use this key to toggle between single and continuous sweep mode. In
single sweep mode, each sweep is initiated with the Run/Hold key.
1. Press the Sweep (3) menu key.
2. Press Sweep Type to switch between Single and Continuous.
RF Immunity
The instrument defaults to RF Immunity High. This setting protects
the instrument from stray signals generated by nearby or co-located
transmitters that can affect frequency and DTF measurements. The
algorithm used to improve instrument’s ability to reject unwanted
signals slows down the sweep speed. If the instrument is used in an
environment where immunity is not an issue, the RF Immunity key can
be set to Low to optimize sweep speed. Use this feature with caution, as
the introduction of an interfering signal might be mistaken for a
problem with the antenna or cable run. If Immunity is set to Low during
a normal Return Loss or VSWR measurement, the instrument will be
more susceptible to interfering signals. Interfering signals can make the
measurement look better or worse than it really is.
1. Press the Sweep (3) menu key.
2. Toggle RF Immunity between High and Low.
RF Pwr In Hold
This setting determines if the RF output power at the RF Out/Reflect In
port stays on or is turned off when the instrument’s Run/Hold setting is
toggled to Hold. When RF Pwr In Hold is Off, the power at the port is
turned off when the instrument is placed in Hold mode and not
sweeping.
Power at the port is resumed when the Run/Hold setting is toggled back
to Run
.
This is useful for users who may not want a signal radiating out of the
port at all times.
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