R3131 Spectrum Analyzer Operation Manual
2.2 Basic Operation
2-28
Apr 10/98
2.2.4
Measuring Frequency Using Counter
The counter function measures the signal frequency at the marker with high accuracy.
You do not have to precisely position the marker on the peak you wish to measure however you should
note that the displayed amplitude value corresponds to the marker position.
The maximum resolution possible for the counter function display is 1 Hz. As you increase the resolution,
you will have to increase the sweep time to compensate.
NOTE:
1. The counter function may not work normally if the span is greater than 200 MHz or the difference between the
marker and the noise level is 25 dB or less.
2.
The signal track mode cannot be used with this function.
The following example shows how to measure the frequency.
Power on
1.
Turn the spectrum analyzer power on.
Initialization
This resets the current settings to the factory defaults.
2.
Press SHIFT and CONFIG (PRESET).
The default settings have now been reset.
Figure 2-19 Factory Defaults Screen
Calibration signal output
This activates the calibration signal used for the measurement.
3.
Press SHIFT, 7 (CAL) and Cal Sig Level ON/OFF.
