Agilent Technologies Signal Analyzer N9030a - Manual (Page 550)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
BW
Example BAND 1 KHZ
BAND?
BWID:AUTO ON
BWID:AUTO?
Notes For numeric entries, all RBW Types choose the nearest (arithmetically, on a linear scale,
rounding up) available RBW to the value entered.
The setting and querying of values depends on the current bandwidth type.
Dependencies When in Zero Span with no EMI Standard selected, there is no Auto setting for Res BW. The
Auto/Man line on the Res BW softkey disappears in this case, and if the SCPI command
[:SENSe]:BWID[:RESolution]:AUTO ON is sent, it generates a message.
While using the Tracking Generator, you must make sure the Start Frequency is high enough to
avoid capturing LO feedthrough in the trace. How high you must make the Start Frequency to
avoid this will depend on the RBW you have set. The analyzer displays a condition warning
message if the Start Frequency falls below roughly 2.5 times the current RBW. The warning is
“Source Uncal;adj Start Freq|RBW|Points”. When you see this warning, you should increase
the Start Freq, narrow the RBW, or increase the number of Sweep Points.
Couplings Res BW is normally coupled to Span; if Res BW is set to Auto, as the Span decreases, so will the
Res BW. Normally, in Zero Span, this coupling is turned off and Res BW has no Auto setting.
When a CISPR or MIL EMI Standard is in use, the Res BW is coupled to Center Frequency and
not to Span, and this is true even in Zero Span.
Sweep time is coupled to RBW when in a non-zero span. If Sweep Time is set to Auto, then the
sweep time is changed as the RBW changes, to maintain amplitude calibration.
Video bandwidth (VBW) is normally coupled to RBW. If VBW is set to Auto, then the VBW is
changed as the RBW changes, to maintain the ratio set by VBW:3 dB RBW. See the
"VBW:3dB
RBW " on page 553"VBW:3dB RBW " on page 553 key description.
Preset 3 MHz
ON
State Saved Saved in instrument state
Min 1 Hz
Max 8 MHz is the max equivalent –3 dB RBW, which means that the named RBW (the one shown on
the key etc) can actually exceed 8 MHz if using a filter other than –3 dB Gaussian
Default Unit Hz
Backwards Compatibility
Notes For backwards compatibility this command obeys both the BANDwidth and BWIDth forms.
For ESA, the maximum Res BW was 5 MHz; on X-Series it is 8 MHz.
Initial S/W Revision Prior to A.02.00
550 Remote Language Compatibility Measurement Application Reference