Chapter 3 67
Making Measurements
Frequency Counter Measurement
Measurement Procedure
CAUTION Press the Restart key to optimize the measuring receiver configuration if you make
any changes to the UUT or to the measuring receiver settings after you make your
first measurement.
Step 1. Setup the measurement system. See “System Hardware Connections” on page 44.
To measure the RF frequency, you do not need to perform the Power Meter
calibration.
Step 2. Make sure you have selected
Measuring Receiver mode in the MODE key menu.
Step 3. Adjust the signal generator to the required settings for your test.
Step 4. Press
Frequency Counter key to perform the measurement. Or, press Preset key.
The default measurement is Frequency Counter with display units in Hz.
Step 5. When the measurement is completed, the measurement result will display.
NOTE The PSA can only search for a signal within a maximum center frequency offset:
Maximum Searchable Offset = (106 *RBW) or (0.001% of Tuned Frequency).
Step 6. You can adjust measurement settings by pressing
Meas Setup, then:
1. To change the tuning mode from
Auto to Man, press the Tuning key and enter
the expected frequency value and unit. The default tuning mode is
Auto.
Using Manual Tuning mode in the following cases:
a. The SigLo warning indicator on screen when you decrease the signal level.
Selecting Man tuning mode and entering the expected frequency may allow
a measurement to be made.
b. You need to measure the Frequency Error. The Frequency Error is the
difference between the measured frequency and the nominal input value.
c. You need to increase the measurement speed by using a known signal.
When the signal frequency under test is above 100 MHz, the
Auto mode
testing is slower than the
Man mode.
NOTE You may connect the PSA and the UUT to a common high standard time base.
Make sure the time base lock is not used for Frequency Counter measurements.
2. To change the gate time from
Auto to Man, toggle the Gate Time key to Man
and enter the time value and unit. The default gate time mode is
Auto. The
default setting is
100 ms. When you need a more stable readout, select a longer
gating time, but it will take longer to get the measurement results. If the gating
time is 2 ms or longer, the resolution is 0.001 Hz.
3. To change the average setting between
On and Off, press the Avg Number key.
When setting to
On, enter the number. The default average setting is Off and the
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