Technical data

Measurement Setup 15
Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz 393
Example:
SEM:OFFS:LIST:BAND 40 kHz or SEM:OFFS:LIST:BWID 40 kHz
SEM:OFFS:LIST:BAND? or SEM:OFFS:LIST:BWID?
SEM:OFFS:LIST:BAND:AUTO 0 or SEM:OFFS:LIST:BWID:AUTO 0
SEM:OFFS:LIST:BAND:AUTO? or SEM:OFFS:LIST:BWID:AUTO?
Meas BW
Enables you to specify the bandwidth to use when measuring the offset. When using the
front panel, only the currently selected offset is affected. All the offsets are affected when
using the remote command. This is the multiplier applied to the resolution bandwidth to
determine the bandwidth to integrate when calculating the power.
Key Path: Meas Setup, Offset/Limits
Key Notes:
The 3GPP standard allows for the construction of an effective measurement bandwidth
out of a group of narrower resolution bandwidths. This allowance is a remedy for the
potential loss in dynamic range which can occur when carrier energy leaks into the
offset due to the RBW filter’s shape factor (nominally 12:1). When the offset’s ratio of
start frequency to the Meas BW is small (approximately 4:1), it is recommended that you
select a small Res BW value (30 kHz) and a large multiplier (Meas BW=33) in order to
increase the dynamic range of the measurement. Refer to offset D in Table 8 on
page 388.
When setting Meas BW > 1, dynamic range is increased, however measurement time is
also increased since an increased number of sweep points are required to make the
measurement. For Meas BW > 1, consider this equation for trace points:
Trace points = (Offset Stop Freq - Offset Start Freq)/ (Meas BW/100)
When Meas BW = 1, the number of trace points are set at the value specified upon
entering the measurement.
Dependencies/Couplings: This parameter must adhere to the rule: (N x Res BW) £
(Stop Freq of the offset - Start freq of the offset), where N is Meas BW value. If the Res BW
is changed, Meas BW will change to ensure this rule.
State Saved: Saved in Instrument State.
Factory Preset: Dependent upon Radio Standard and device selected, refer to the default
tables for “Offset/Limits" on page 388 for this value.
Default Terminator: x Res BW