Recording, Learning and Storing Facilities 1250 Frequency Response Analyzer
12-20 SH/1250/3
12.4.8 ADJUSTING THE PLOTTING FIELD TO SUIT PREPRINTED CHART
PAPER
It may be necessary to adjust the size and position of the plotting field without knowing
in advance the exact coordinates required. See Fig. 12.3 above for a definition of these
coordinates. An example is when attempting to align a plot to the grid lines on
preprinted chart paper.
In this case the [PLOTTER SCALING] page of the DISPLAY/PLOTTER menu can be
used, in conjunction with the VARIABLE key.
Assuming a suitable plotter has been set up and connected to the 1250, and the
DEVICE soft key of the (PLOTTER COMMON] menu has been correctly set, proceed as
follows:
1. SELECT the [PLOTTER SCALING] page of the DISPLAY/PLOTTER menu.
2. Press the SCALE soft key; SELECT and ENTER the [variable] mode. In SCALE
[variable] mode, the paper size selection (A3 or A4) is ignored.
3. Press the VARIABLE key on the front panel;
SELECT and ENTER the [X-min] mode.
The Display becomes:
VARIABLE: X-min = +0.000
DIR ↑ SLOW > >> FAST
and the pen moves to the MINIMUM position of the plotting field automatically.
4. Use the VARIABLE soft keys in the usual way (see Chapter 9, Section 1 "The
Variable Key") to vary the value of X-MIN until the plotter pen is in or near the
required position over the chart paper's left-hand border (the Y-axis).
5. Retrieve the VARIABLE menu by pressing VARIABLE, and SELECT and ENTER the
next page i.e. [Y-min].
6. Adjust the value of Y-MIN until the pen is exactly above the lower left-hand corner of
the required plotting field. It may be necessary to readjust X-MIN, and activate 'pen
down', to ensure accurate alignment with the required point on the chart paper.
7. Adjust the values of X-MAX and Y-MAX in a similar way (Steps 3 to 6 above) to
complete the alignment.
Finally check all settings by pressing MINIMUM and MAXIMUM, via the PLOT key.
Note: The numerical values of the four plotting field coordinates arrived at above can be
found by pressing the appropriate soft key in the [PLOTTER SCALING] menu.
They may be noted down for future use, to avoid having to repeat the alignment
procedure. In any case they remain in the 1250's memory until INIT or RESET
are activated.
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