78 Chapter 3
Making Measurements
Tuned RF Level Measurement
occur.
NOTE As the power level is decreased the measurement time will increase since the
signal is closer to the noise and more averaging is required. The sensor module
attenuates the signal. When measuring very low level signals, consider using the
relative TRFL measurement which does not require the sensor module and power
meter.
7. When all source levels have been measured, calculate the TRFL measurement
error. See the Measuring Receiver Personality specifications in the PSA
Specification Guide. The Absolute Measurement Accuracy specification
applies
NOTE If you wish to start a new series of measurements, and want to clear the Cal Factor
values, press
Measure Setup, and toggle the IF BW to 75 Hz then back to 10 Hz.
Press Measure, Tuned RF Level to begin a new measurement.
NOTE If the frequency setting of the measurement is changed you must clear the Cal
Factor values and recalibrate the ranges at the new frequency.
Performing a Relative TRFL Measurement Without the Power Meter
Step 1. Connect, configure and verify the measurement system. See “System Hardware
Connections” on page 44 except do not use the N5532A/B Sensor module and
connect the DUT output to the PSA RF Input.
See “System Configuration” on page 47. Although you are not using the power
meter for this test, you may want to set it up for future for future Power
measurements.
Step 2. On the PSA, perform the Auto Align routine by pressing
System, Alignments, Align
All Now
.
Step 3. Set the signal source amplitude and frequency. For this example use 0 dBm and 50
MHz.
Step 4. Configure the PSA settings as shown in the table above.
Step 5. Press the
Restart key. Error messages will appear because the measuring receiver
defaults to the absolute TRFL measurement where the power meter is required.
Step 6. Press
Meas Setup, Set Ref keys. The measuring receiver is now set to perform the
relative TRFL measurement where a power meter is not required. The error
messages will go away, and the Tuned RF Level display should read 0.000dB.
Step 7. Press
Measure Control, select Measure Single and press the Restart key. This will
allow you to control when the measurement is taken so you can assure the source is
set to the proper level before beginning the measurement. You will need to press
the
Restart key each time you want to make a measurement.
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