Ronde & Schwarz R&S FPL1000, Руководство пользователя

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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
340 User Manual 1178.3370.02 ─ 09
To define an external trigger:
1. Connect an external device that will provide the trigger signal to one of the TRIG-
GER INPUT / OUTPUT connectors on the R&S FPL1000 (for details see the
R&S FPL1000 "Getting Started" manual).
2. In the "Trigger And Gate" dialog box, define the "Trigger Source" = "External".
3. Configure the external trigger as described for the other power triggers.
To define a power trigger:
1. In the "Trigger And Gate" dialog box, define the "Trigger Source" = "IF Power".
2. Define the "Trigger Level": the power level at which the measurement will start.
3. Define whether the signal must cross the trigger level on a falling or on a rising
edge ("Slope") to trigger the measurement.
4. To start the measurement with a time delay, define a "Trigger Offset".
5. To reject triggers due to noise or jittering in the signal, define a "Hysteresis" that is
larger than the expected noise or jittering. After the previous trigger, the signal
must exceed this threshold before the next level crossing triggers a new measure-
ment.
6. To skip multiple triggers in a burst, define a "Holdoff" time that must pass between
two triggers. The holdoff time should be slightly larger than the burst.
7.7.2 Gating
● Gated Measurements ............................................................................................340
● Gate Settings ........................................................................................................ 341
● How to Configure a Gated Measurement ..............................................................342
7.7.2.1 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.
Trigger and Gate Configuration