User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
126User Manual 1178.3370.02 ─ 09
Remote command:
Enable calculation:
CONFigure:CMEasurement:RESult:P1DB[:STAT] on page 635
CONFigure:CMEasurement:RESult:P3DB[:STAT] on page 636
CONFigure:CMEasurement:RESult:PNDB[:STAT] on page 636
CONFigure:CMEasurement:RESult:CVALue on page 635
Query results:
FETCh:CMEasurement:P1DB[:RESult]? on page 637
FETCh:CMEasurement:P3DB[:RESult]? on page 637
FETCh:CMEasurement:PNDB[:RESult]? on page 637
7.2.3.4 How to Determine Compression Points
The following step-by-step instructions demonstrate how to determine the compression
point of an amplifier.
To configure the internal generator for a power sweep measurement
Before you connect your DUT to the R&S FPL1000, perform a reference power sweep
measurement with the internal generator.
1. Press the [MEAS] key or select "Select Measurement" in the "Overview".
2. Select the "Power Sweep" measurement function.
3. Select "GEN Config".
4. Set the "State" to "On".
5. Define the output power range to be provided to the DUT by the generator as the
"Level Start" and "Level Stop".
6. Connect your DUT to the R&S FPL1000.
7. Perform a new measurement.
The input power vs. the output power of the DUT are displayed.
8. If the power sweep shows a constant deviation to the trace without the DUT due to
cable loss or similar, define a "Level Offset" in the "Internal Generator" settings.
To configure the compression point measurement
1. Select "Compr Points".
2. In the "Compression Points" dialog box, select the compression levels to calculate.
3. Set the "Compression Measurement" state to "On."
The power levels of the DUT input and the DUT output are indicated in the power
sweep diagram. The power levels at which the selected compression occurs are
indicated in the result summary.
Measurements and Results