Agilent Technologies N8201A Service Manual download pdf (Page 144)

144 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz

7 File

File Types

You can save the following types of files:

State - A file that contains a copy of the state of the analyzer at the time the file is saved.

The settings of most analyzer functions are saved in the state files but not traces, limits,

and corrections. When a

State file is loaded into the analyzer, the analyzer is restored to the

same state as when the file was saved. Some settings are not saved in the

State files, for

example the GPIB address; these settings are called “persistent.” In this manual, each

function describes whether that function is saved in “Instrument State” or is persistent.

Trace - A file that contains a copy of the trace data for one or more traces. There are two

formats for trace files,

Trace + State and CSV files.

Trace + State: A file that contains the trace data and a copy of the current analyzer state.

The trace and state are stored in an internal data format (TRC), which cannot be loaded into

a PC, but can be loaded back into the analyzer. Traces can be loaded individually or as a

group. When a

Trace + State file is loaded into the analyzer the trace data that was on the

screen, when saved, is loaded into the analyzer. This enables you to view the trace as it

looked when it was saved. Because the state data is also saved, the analyzer settings,

including all the annotation on the screen, is restored as well. To preserve the trace data,

the traces contained in the saved files are placed in

View mode (see “Trace/View" on

page 511) so that they are not immediately overwritten by new trace data. This means that

you can save traces while making a measurement, and later load them back into the

analyzer, where you can print them or transfer them to a computer, in CSV format, for

analysis. If you wish to compare two saved traces, place traces in view mode before saving

them. This prevents the trace from being rewritten based on a state change from

subsequent loads.

CSV: A file that contains trace data in comma-separated values format (CSV, standard PC

spreadsheet format), to be read into a spreadsheet for analysis. Most spreadsheet

programs support CSV format. They cannot be loaded back into the analyzer.

Limits - A file that contains a copy of the analyzer limit sets at the time the file is saved.

Limits provide data sets to determine whether a trace has exceeded preset specifications.

Limit sets can hold up to 200 points and can only be saved individually. Refer to the

File,

Save, Source key description, page 154. When you load a Limits file into the analyzer, you

restore all of the limit sets that were in the instrument at the time of the save.

When loading Limits files, be sure you have selected the appropriate X Axis Units:

frequency or time (

Display, Limits, Properties, X Axis Units). If you are in time X-Axis

Units, and you load frequency limits, all current limit line data will be erased and the

analyzer will switch to frequency units. The reverse of the this situation also holds true.

Screen - A file that contains an exact representation of the analyzer display at the time it

was saved. You cannot extract data from

Screen files as you can with Trace files, but you

can print them or include them in other documents;

Screen files look exactly as the display

looked when the file was saved. They cannot be loaded into the analyzer. There are four

formats for screen files,

Bitmap and Reverse Bitmap.

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Agilent Technologies N8201A Service Manual Page 144

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