Agilent Technologies N8201A Service Manual Page 96

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96 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz
4 BW/Avg
VBW/RBW
Selects the ratio between the video and resolution bandwidths in a 1, 3, 10 sequence. Video
bandwidth wider than resolution bandwidth (VBW/RBW ratio > 1.000), provides the best
peak measurements of signals such as wideband radar pulses. VBW narrower than RBW
(VBW/RBW ratio < 1.000) reduces the variance of noise-like signals and makes spectral
components close to the noise floor easier to view. Pressing Preset or selecting Auto
Couple, Auto All sets the ratio to 1.000 X. When VBW/RBW (Auto) is selected, the ratio is
determined as indicated in Table 1.
This key is grayed out when the Quasi Peak or EMI Average detector is selected.
Key Path: BW/Avg
Saved State: Saved in Instrument State
Factory Preset: Auto (1.0)
Range: 0.00001 to 3.0e6 (3,000,000), in a 1, 3, 10 sequence
Remote Command:
[:SENSe]:BANDwidth|BWIDth:VIDeo:RATio <number>
[:SENSe]:BANDwidth|BWIDth:VIDeo:RATio?
[:SENSe]:BANDwidth|BWIDth:VIDeo:RATio:AUTO OFF|ON|0|1
Table 1 VBW/RBW Ratio Auto Rules
Detector Mode Noise Marker Ratio Notes
Peak On 10 Noise response is estimated for wide VBW
case
Negative Peak On 10 Don’t care
Average On 0.1 Narrow VBW for low-sigma marker readout
Normal On 0.1 Don’t care (noise marker makes is not valid
with normal detection.)
Sample On 0.1 Narrow VBW for low-sigma marker readout
Peak Off 10 Wide VBW for good impulse BW (pulsed RF)
Negative peak Off 10 Don’t care
Average Off 0.1 Narrow VBW for low-sigma trace results
Normal Off 1.0 Swept analysis CW signal setting
Sample Off 1.0 Wide VBW for good impulse BW (pulsed RF)
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