Additional Displayed Information 1250 Frequency Response Analyzer
11-6 AMK/1250/3
9 LIMIT r LO r HI
VALUES value value
10 LIMIT theta LO thata HI
VALUES value value
11 LIMIT log r LO log r HI
VALUES value value
µµP 1 PROCESSOR MODE LAST ERROR
READY/BUSY/ SUPERVISOR/ See Note 1
PROGRAM*/pause NORMAL
* PROGRAM indicates that the microprocessor is occupied in working
through a program: BUSY indicates that it is engaged on some other
activity. Pause indicates that it is waiting for a user input.
The three position keyswitch on the rear panel of the 1250 allows the
user to set the operating mode to 'Supervisor', 'Operator' or 'Normal'.
Supervisor/Normal enable/disable writing to the permanent memory
respectively. The 'Operator' position is reserved for future use, but at
present has the identical effect as 'Normal'.
Note 1: The Error Codes for the last three errors noted are displayed
here. For example, the display could show: 01 21 59. The latest
appears on the left, in this case 01.
As new errors are detected, the existing numbers shift to the right, such
that if the next error code is code. 70, the display changes to:
70 01 21.
2 FREE MEM PROGRAM NV PROGRAM FILE
BLOCKS value value value
Memory in the 1250 is of two types:
a. Memory assigned to the File (see Chapter 12 Section 2). The File is
used for storing results and has a capacity of 470 blocks, each block
capable of holding one File result.
b. Memory assigned to storing learnt programs. This section divides into
two memory locations:
i. A permanent 'Supervisor' memory. This has a capacity of 508
blocks, each block capable of holding one line of program. Nine
separate programs may be stored in this memory (Nos. 10 to 18)
providing that the keyswitch on the rear panel is in the 'Supervisor'
position. This memory location is refered to as NV PROGRAM in
this status page.
ii. A battery backed 'Normal' memory, which will retain information
for at least 100 hours while the instrument is switched off. This
has a capacity of 500 lines of program and allows the storage of
nine separate programs (Nos. 1 to 9). This is refered to as
PROGRAM in this status page.
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