6 Functions Common to More Than One Operating Mode
90 SRM-3006 Narda
To change the units:
✓ The top menu level of the operating mode is displayed.
1. Press the Display softkey.
2. Press the Unit softkey.
3. Use the rotary control to highlight the desired units.
ª The change is applied to the display immediately.
4. Press the OK key.
ª The selected units are saved.
6.9 Noise suppression (Noise Thresh.)
Safety Evaluation • Meas. Range • Noise Thresh. / Noise Suppr.
Level Recorder • Meas. Range • Noise Thresh. / Noise Suppr.
UMTS • Meas. Range • Noise Thresh. / Noise Suppr.
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 any results below this threshold, the
instrument will not display the measured value but indicates the threshold
value and the “<” character.
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 or deactivate noise suppression:
1. Press the Meas. Range softkey.
2. Press the Noise Suppr.: softkey until OFF is displayed (toggle function).
Noise suppression is then activated.
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