Technical data

92 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz
4 BW/Avg
Res BW
Enables you to select the 3.01 dB resolution bandwidth (RBW) of the N8201A in 10% steps
from 1 Hz to 3 MHz, plus bandwidths of 4, 5, 6, or 8 MHz.
If an unavailable bandwidth is entered, the closest available bandwidth is selected.
Sweep time is coupled to RBW. As the RBW changes, the sweep time (if set to Auto) is
changed to maintain amplitude calibration.
Video bandwidth (VBW) is coupled to RBW. As the resolution bandwidth changes, the
video bandwidth (if set to Auto) changes to maintain the ratio set by VBW/RBW.
When Res BW is set to Auto, resolution bandwidth is autocoupled to span, except when
using the CISPR and MIL detectors (Quasi Peak, EMI Average EMI Peak and MIL Peak). For
these detectors, Auto RBW coupling is to the center frequency. The ratio of span to RBW is
set by Span/RBW (described on page 104). The factory default for this ratio is
approximately 106:1 when auto coupled. When Res BW is set to Man, bandwidths are
entered by the user, and these bandwidths are used regardless of other N8201A settings.
In zero span, the auto/manual function of this key is not applicable. When Res BW (Auto) is
selected in non-zero span, any changes to Res BW while in zero span will revert to the Auto
value when you return to non-zero span. When Res BW (Man) is selected in non-zero span,
any changes to Res BW while in zero span will be maintained when you return to non-zero
span.
When the Quasi Peak or one of the EMI detectors is selected, the resolution bandwidths
available are restricted to the set defined in Tab le 2 on page 116. When the MIL Peak
detector is selected, the resolution bandwidths available are restricted to the set defined in
Tab le 4 on page 120.
A # mark appears next to Res BW on the bottom of the display when it is not coupled. To
couple the resolution bandwidth, press Res BW (Auto).
For applications that require 6 dB resolution bandwidths, it is possible to use an equivalent
3 dB resolution bandwidth. Because the N8201A has Gaussian RBW, the equivalent 6 dB
bandwidth of any RBW filter can be determined using the following formula: 6 dB RBW = 3
dB RBW x 1.414. For example, if a 6 dB RBW of 100 kHz is required, the equivalent 3 dB
RBW filter would be 100 kHz/1.414 = 70.7 kHz. The closest RBW filter for the N8201A that
would be used is 68 kHz.
Key Path: BW/Avg
Saved State: Saved in Instrument State
Factory Preset: Auto (3 MHz)
Range: 1 Hz to 8 MHz