R&S FSVA3000 Series, Руководство пользователя

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Common Measurement Settings
R&S
®
FSVA3000/ R&S
®
FSV3000
402 User Manual 1178.8520.02 ─ 01
8.6.2 Gating
● Gated Measurements ............................................................................................402
● Gate Settings ........................................................................................................ 405
● Continuous Gate Settings ..................................................................................... 407
● How to Configure a Gated Measurement ..............................................................408
8.6.2.1 Gated Measurements
Like a gate provides an opening in a fence, a gated measurement lets data from the
input signal pass in defined areas only. The
gate controls exactly when data is included
in the measurement results and when not. The gate is opened by the trigger source,
which is also the gate source.
Gates can be used in two different modes:
●
Level: The gate opens and the measurement starts when a defined level in the
gate source is exceeded and stops when the gate source drops below the "Gate
Level" .
Using a pulsed gate signal in level mode, the following behavior can be achieved:
When the gate source signal is active, the input signal data is collected; when the
gate signal is inactive, the input signal is ignored.
●
Edge: The gate opens and the measurement starts when a defined level in the
gate source is exceeded and stops when the defined "Gate Length" is reached.
Restrictions
●
The "Gate Mode" Level is not supported for Rohde & Schwarz power sensors. The
signal sent by these sensors merely reflects the instant the level is first exceeded,
rather than a time period. However, only time periods can be used for gating in
level mode. Thus, the trigger impulse from the sensors is not long enough for a
fully gated measurement; the measurement cannot be completed. For details on
power sensors see
"Using a Power Sensor as an External Power Trigger"
on page 317.
●
Gated measurements are not available for frequency sweep mode, see " Sweep
Type " on page 387.
●
For gated measurements, the maximum RBW is restricted to 3 MHz. If the current
RBW is larger when you enable gating, the RBW is automatically reduced to
3
MHz. See Chapter 8.6.2, "Gating" , on page 402.
Additionally, a delay time can be defined so that the first few measurement points after
the gate opening are ignored.
Trigger and Gate Configuration