1250 Frequency Response Analyzer Recording, Learning and Storing Facilities
SH/1250/3 12-7
12.2 THE FILE
12.2.1 INTRODUCTION
The File is a section of memory in the 1250 which can he used to store results from
measurements sequences, for later recall and further processing if required. The 1250
retains this File for at least 100 hours after power is switched off.
If required, the results sent to the File can be only those which have passed (or failed)
the Limit check. When the stored results are read back from the File, further, different
Limits can be applied.
12.2.2 MAXIMUM FILE SIZE
The total amount of memory available in the 1250 is approximately 470 Blocks, each
Block capable of holding one File result.
On initialisation, all memory is cleared, and 99 Blocks are allocated by default to the
File. This leaves the maximum number of Blocks (less 99) free for enlarging the File.
The number of free memory Blocks can be found at any time by interrogating the
second page of the STATUS menu, via the 'µP' soft key (Chapter 11, Section 1.4).
12.2.3 SELECTING FILE SIZE
The number of memory Blocks allocated to the File may be selected to be other than
the default value of 99, if required.
The first page of the DATA OUTPUT menu, [DATA OUTPUT], accesses the FILE soft
key, as described in section 1.2 above. On ENTERing the File soft key selection, the
Display shows:
FILE SIZE( 99)
indicating that the default File size is 99 Blocks.
To alter the File size, ENTER the number of Blocks required via the numeric keypad;
the new number replaces 99 inside the round brackets. Error 46 is flagged if the File
size entered exceeds the number of memory Blocks free, or if an attempt is made to
reduce the File size to less than the number of results already filed. Error 45 is flagged
if the 1250 is measuring when ENTER is pressed.
12.2.4 OVERWRITING OF RESULTS IN THE FILE
If more results are sent to the File than the number of Blocks allocated to it, the earliest
results in the File are discarded to make room for the latest results, which add to the end
of the File. That is, only the last 'n' results are retained, where 'n' is the File size.
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