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Fig. 3.6 Improving the Accuracy of Frequency Measurement by Using Marker Function
The marker counting function can be only used to measure continuous wave signals or discrete spectrum
components that their amplitudes are greater than -50dBm and such amplitudes must be 30dB higher than noise
levels.
d)
Disable the marker counter function
Press
【
Marker
】
→
[Counter Mkr Off On] to disable the marker count function.
CAUTION
When executing frequency count function, if the sweep speed of the Spectrum Analyzer
slows down, this is normal as the Spectrum Analyzer is taking some time for accurate
positioning of signal and IF count in the background!
CAUTION
When executing frequency count function, to accurately measure the frequency, the tested
signal generator should share the same time base with the Spectrum Analyzer!
3.3 How to Measure Small Signals
The noise generated inside the spectrum analyzer determines its ability to measure small signals. The following
methods can be used to change the measurement setting, thus improving the measurement sensitivity of the
Spectrum Analyzer.
3.3.1 Reduce RF attenuation decrement to measure small signals
The input attenuator affects the signal level of the input instrument. If the input signal is very close to the
noise base, by reducing the decrement of the attenuator, the signal can be extracted from the noise.
CAUTION
The total power of all signals input to the spectrum analyzer shall be less than +30dBm
(1W).
