9-4
Understanding the CITIfile Data Format
The CITIfile Data Format
A CITIfile Package
A typical package is divided into two parts: The first part, the header, is made up of
keywords and setup information. The second part, the data, usually consists of one or more
arrays of data. Example 1 shows the basic structure of a CITIfile package:
Example 1, A CITIfile Package
The “header” part CITIFILE A.01.00
NAME MEMORY
VAR FREQ MAG 3
DATA S RI
The “data” part BEGIN
-3.54545E-2, -1.38601E-3
0.23491E-3, -1.39883QE-3
2.00382E-3, -1.40022E-3
END
When stored in a disk file there may be more than one CITIfile package. With the 8510
network analyzer, for example, storing a “memory all” will save all eight of the memories
held in the instrument. This results in a single file which contains eight CITIfile packages.
The CITIfile Header
The header section contains information about the data that will follow. It may also
include information about the setup of the instrument that measured the data. For
example, the header may include information such as:
• CITIfile version number
• Network analyzer model number
• Firmware revision currently installed in the analyzer
• Type of Data
• Data Format
• Measurement parameters
• Start and stop frequencies
• Number of sample points
The CITIfile header shown in Example 1 has just the bare minimum of information
necessary; no instrument setup information was included.
An Array of Data
An array is numeric data that is arranged with one data element per line. In the Smith
chart and polar formats, the data is in real and imaginary pairs. In all other formats, the
data is still in pairs, but the second term of the pair is 0E0. All information is true
formatted data in the same format as on the analyzer display (dB, SWR, etc.).
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