User`s guide

4-47
Printing, Plotting, and Saving Measurement Results
Saving Measurement Results
Viewing Files Within the Analyzer
All these files are rolled up into a single instrument state, so the analyzer shows only the
“FileXX” part of the name, without an extension. The file description will say ISTATE,
followed by parentheses with letters in them, such as (CDG). These letters are explained
on the bottom of the analyzer screen, and indicate some of what is included in that
instrument state. In this example, the state includes the Calibration Array, Data, and
Graphics.
The only way to see all the file extensions previously described is to save the instrument
state to a disk and view the file structure on an external computer.
Saving Time Gated Frequency Data
Internal data processing is done sequentially beginning with raw data and ending with
error correction and all formatting applied. The time domain processing occurs near the
end of this processing chain, so data showing the effects of time domain processing is only
available in "formatted arrays."
Differences between Raw, Data, and Format Arrays
The following discussion explains the data processing flow in the network analyzer. This
information is very important if you will be utilizing data from your analyzer for use in
computer applications such as spreadsheets, word processing, programs, etc. Refer to
Figure 4-13 on page 4-38.
The analyzer receives data from its A, B, and R or Aux-in inputs. Notice the three
highlighted blocks. They represent the raw, data, and format arrays. You can save your
measurement data in any or all of these format arrays each time the data is saved. Select
the arrays of interest based on the factors discussed in this section.
For this discussion, only DISK saves will be described. Data can be saved to internal
non-volatile memory or transferred over GPIB as well as to a floppy disk. You will find
multiple files saved depending on the arrays chosen under the analyzer's
menu. When using these files, it is important to know which file
extension is needed for your particular job.
Raw Arrays
On the analyzer, press the
Data created the first time in this manner will be saved as filename “FILE00.r1”. The file
extension .r1 indicates the data was created while channel 1 was active and stored in the
analyzer's raw data array. If you save the data again, but while channel 2 is active, you will
get a new file called “FILE01.r2”. RAW data are not commonly used unless sophisticated
data processing is to be performed in an external PC. As an example, multi-port calibration
is created by exporting raw data to a PC where error-correction for each of the multi-port
paths is applied to them.
DEFINE DISK-SAVE
Save/Recall
DEFINE DISK-SAVE
RAW ARRAY ON