6.14 Setting the noise threshold (Noise Thresh.)
Narda IDA-3106 123
6.14 Setting the noise threshold
(Noise Thresh.)
Direction Finding
Level Meter
Multi-Channel Power
Every electronic instrument generates a certain level of intrinsic noise. This
noise is present in all frequency ranges, including those not occupied by
signals. It is easy to see when a signal is swamped by the intrinsic noise
when performing spectrum analysis with a graphical display of the
spectrum. To enable this distinction to be made in other operating modes, it
is possible to set a threshold. For results below this threshold, the device
does not display the measured value but instead shows the threshold value
preceded by “<”.
You can select threshold values of 0, 3, 6, 10, 15 and 20 dB.
• 0 dB: intrinsic noise level, does not give any information about the signal
• 3 dB: usual value selected for signals with normal noise levels
• > 3 dB: for signals with higher noise levels
The threshold values are relative and always refer to the level of the intrinsic
noise floor.
To activate / deactivate the noise threshold:
1. Press the Reference Level softkey.
2. Press the Noise Thrsh. softkey until On appears.
The noise threshold is activated.
To select the threshold value:
The noise threshold must be activated before you can select a value.
1. Press the Reference Level softkey and then the Noise Thresh. softkey.
2. Use the rotary control knob to set the desired input sensitivity and then
press the OK key.
The threshold value is set.
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