Rohde & Schwarz R&S UPP, User Manual

Page: 491 / 938

Instrument Functions
R&S
®
UPP
475 User Manual 1411.1055.32 ─ 10
Remote command:
SENSe[1]:UFILter<n2>:STOPb:UPPer
on page 776
5.40.5 File-Defined Filter
If the filters installed on the instrument do not satisfy the requirements of the applica-
tion concerned, it is possible to read in a filter from a file. Two file formats are suppor-
ted in which the filter is described either by the coefficients of the transfer function
(
*.coe
) or by the poles and zeros (
*.zpz
or
*.npz
and
*.xpz
) in the z level.
5.40.5.1 File Def Filter
File Def Filter
A file can be loaded in which the filter is described either by the coefficients of the
transfer function (
*.coe
) or by the poles and zeros (
*.zpz
or
*.npz
and
*.xpz
) in
the z level.
The button opens a browser that can be used to select the filter file.
Remote command:
SENSe[1]:UFILter<n2>:FNAMe
on page 775
5.40.5.2 Coefficients of the transfer function
The filter in the file must be an IIR filter with four pairs of poles and zeros in the form of
four consecutive biquads.
The transfer function S(z) is then derived as follows:
 
i a i a z z
i b i b z z
gain z S
i
i
2 1
2 1
3
0
2
3
0
2
  
  
 




Example:
See
RS_EXAM.COE
in
D:\UPV\USER
User-Definable Filters