Chapter 3 77
Making Measurements
Tuned RF Level Measurement
Range Hold
Default is Off. When Range Hold is
OFF, the range setting will automatically
change based on the SNR.
Setting Range Hold to
ON will force the measurement to remain in the current
range the measurement is using. This may be useful for making repeatable
measurements on signal levels that are exactly at the range change trip point or for
unstable signals near the range change trip point.
Set Ref
Used when performing relative TRFL measurements. Upon pressing Set Ref, an
amplitude reference is taken. When performing relative TRFL measurements a
Range 1 Cal Factor is not obtained, but Range 2 and Range 3 cal factors are
required.
Step 7. Press the
Restart key and wait for the measured value to be displayed.
Step 8. 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.
NOTE Do not Preset the PSA, or use the Frequency Counter function. If you do, the
instrument will require at least 30 minutes for stabilization.
Step 9. Perform the following steps for each measurement value:
1. Decrease the source power level to the next lower setting and press the
Restart
key.
NOTE Since the PSA will automatically change ranges and calibrate the ranges as needed
on the first pass through a new measurement, use step sizes of 10 dB or less to
obtain optimum range calibrations.
2. Record the Tuned RF Level result.
3. Continue decreasing the source level and repeating steps 1 and 2.
4. When the source level reaches a power level where the PSA requires the Range
2 change, your measurement will be interrupted and a range calibration will
occur. This range calibration will only occur the first time you perform the
measurement at a particular frequency and power level using the current PSA
settings. The approximate range switch level is displayed on screen.
If any PSA settings such as IF BW, or if the input frequency is changed, a new
range calibration will be required.
5. Continue decreasing the source level and repeating steps 1 and 2.
6. When the source level reaches a power level where the PSA requires the Range
3 change, your measurement will be interrupted and a range calibration will
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