Rohde & Schwarz R&S UPP, User Manual

Page: 431 / 938

Instrument Functions
R&S
®
UPP
415 User Manual 1411.1055.32 ─ 10
Remote command:
SENSe[1]:FILTer<n2>
on page 773
Equalizer
Used for activating/deactivating a equalizer table for the FFT bins.
In this way the frequency response of a transmission link can be equalized, for exam-
ple, and in so doing the measurement point is transformed into another reference
point.
When equalization is enabled the computed FFT bins are multiplied by a frequency-
dependent factor after which they are used to calculate the total RMS value and
applied to the display.
The factor is determined by interpolation between the two adjacent frequency refer-
ence points in the equalizer table.
Equalization of the FFT spectrum is an attractive alternative to filtering the input signal,
since the equalizer file can simply be generated from the frequency response requiring
equalization and need not be in the form of a coefficient file or pole/zero file.
Application:
In acoustic measurements (e.g. with mobile telephones) on artificial ears of type 3.2 or
higher, it is possible to compensate for the transfer function "ERP" (ear reference point)
to "DRP" (drum reference point). Measurement of the sound waves by the microphone
applied to the "eardrum" can thus be referred to the required measurement point (at
the auricle).
Note: The equalizer table is created after acquiring or reading in the trace data from
the "DUT" in the "DispConfig" panels.
"deactivated" The equalizer is disabled; the FFT bins are used and displayed with-
out change.
"activated" The equalizer is enabled; the next entry field "Equal File" for the file
name of the equalizer table is activated and the file shown there is
loaded.
Remote command:
SENSe[1]:VOLTage:EQUalize
on page 759
MMEMory:LOAD:IEQualize
on page 758
FFT Analysis