RF User Correction CMU
1100.4903.12 1.30 E-10
File Format for User Correction Tables
The user correction file is an ASCII file named USERCOR1.DAT that is stored in the directory
C:\INTERNAL\USERCOR\ on the internal hard disk of the CMU. The file contains up to 6 independent
tables to store the correction values for the 3 RF output connectors and the 3 RF input connectors of
the instrument. Each table has the following structure:
[PortID]: [Freq1] [Freq2] ... [Freqn]
[Level1]: [Dev11] [Dev12] ... [Dev1n]
[Level2]: [Dev21] [Dev22] [Dev2n]
... ... ... ... ...
[Levelm]: [Devm1] [Devm2] ... [Devmn]
Comments in the file must be introduced by a double dagger #. Spaces and indentations are allowed
for easier readability of the file. The first character in a line can be a minus sign but must not be a plus
sign. The following example shows a valid user correction file:
# This is a comment
# (any number of spaces is allowed)
# indentations are allowed,
# spaces and TAB are used for separation
RF2in: 500 1000 1500 2000
10: 1.20 -1.2 -.23 -0.5 # comments are allowed at the end of a line
0: 0.34 1.14 1.20 -1.2
-10: 1.19 -1.19 -1.12 1.00
-14: -0.32 +1.11 -0.50 1.10
RF1in: 200 800 1500
10: +1.20 -.91 .5
0: -0.12 +1.11 -0.50
RF3OUT: 400 1000 1555 2500
10: 1.20 -1.20 -0.23 -0.5
0: 0.34 1.14 1.20 -1.2
-10: 1.19 -1.19 -1.12 1.00
-14: -0.12 +1.11 -0.50 1.10
Note: In general RF user correction tables are no longer valid after an update of the path
correction data, e.g. by means of the automatic calibration system R&S ACS. To ensure
that outdated user correction data are not used inadvertently, the ACS renames all files
c:\internal\usercor\ *.dat
➠
c:\internal\usercor\ *.bak after a change of the path correction
data. Existing *.bak files are overwritten.
Ranges of Values and Limitations
The table contains the following elements:
PortID
Identifier for the RF connector, written in upper or lower case letters and
followed by a colon. The following port IDs are valid:
RF1IN, RF2IN, RF4IN for the 3 RF input connectors (input level correction)
RF1OUT, RF2OUT, RF3OUT for the 3 RF output connectors (output level correction)
Frequency points
Frequency of the measured or generated signal in MHz, to be arranged in
ascending order, starting in column 2 (lowest frequency). The frequency points
must be integer numbers (i.e. integer multiples of 1 MHz) and can be
distributed across the entire RF input and output frequency range of the
instrument (see data sheet).
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