NARDA IDA, Operating Manual, Page: 131 / 292

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.