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17.3 Operating modes
Narda IDA - 3106
255
17.3.3 Spectrum Analysis
17.3.4 Level Meter
Measurement principle Spectrum analysis
Resolution bandwidth RBW,
(-3 dB nominal)
10 Hz to 20 MHz (1-2-3-5 steps)
Video bandwidth VBW and
RMS detection
• 0.2 Hz to 2 MHz (1-2-3-5 steps) or off
Coupled with selected RBW (VBW = RBW/10 … RBW/1000)
• RMS detection: The effective integration time for forming the
RMS value can be defined as T  0.32/VBW.
Filter
• Type: Gaussian
• Shape factor (-60 dB/-3 dB): 3.8 typical
Trace
• Act: Displays instantaneous (actual) spectrum
• Max: Maximum hold function
• Avg: Average over a selectable number of spectra
(4 to 256) or a selectable time period of 1 to 30 min.
• Min: Minimum hold function
• Ref: Reference Trace stored by the user for comparing
spectrums or for Delta Spectrum view
Measurement functions
• Spectrum: graph, peak table, channel power
• Delta Spectrum: displays the selected Traces relative to the
Reference Trace (Ref)
• Spectrogram
• Spectrogram & Spectrum
Spectrogram time axis • Up to 400 traces (spectrogram lines) can be captured
• Frequency resolution of Fspan/860
• Observation length: app. 4 s up to 40 hours
• Time resolution: as fast as possible, 10 ms, 20 ms, 50 ms,
100 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, 20 s, 50 s, 1 min,
2 min, 5 min or 6 min
Spectrogram detection RMS, +Peak, -Peak
Magnifier (Graphical Zoom) • Simultaneous display of the selected spectrum and an enlarged
view of the section of interest
• Magnification level of 10 x and 50 x
Measurement principle Selective level measurement at a selectable frequency
from 9 kHz to 6 GHz
Detector
• Peak (holding time 480 ms)
• Root mean square value (RMS), average time selectable from
120 ms up to 30 min
Channel bandwidth CBW,
(-6 dB)
100 Hz to 32 MHz
In steps of
100, 125, 160, 200, 250, 320, 400, 500, 640, 800, 1000 Hz, …,
10 MHz, 13.33 MHz, 16 MHz, 20 MHz, 26.67 MHz, 32 MHz