Recording, Learning and Storing Facilities 1250 Frequency Response Analyzer
12-18 SH/1250/3
Using the remaining soft keys, ENTER the other three coordinates needed to define
the chosen plotting field.
If the numerical values of the required plotting field coordinates are not known, or if it
is necessary to adjust the plotting field to coincide with pre-printed chart paper, the
SCALE [variable] menu may still be used, in conjunction with the VARIABLE key.
Section 4.8 below explains this method.
For the present example plot, leave SCALE at its default state i.e. [ fixed ].
12.4.6 PERFORMING A PLOT
Connect a suitable plotter to the appropriate port of the 1250, and set mode switches to
their correct positions (Section 12.4.1 above explains this).
The plotter's activities are controlled via the PLOT key on the front panel. The five soft
keys accessed via the PLOT key are:
GRAPH AXES MINIMUM MAXIMUM ZERO
There are no selections associated with these soft keys. Pressing each key initiates a
plotting action directly (except for the GRAPH key: see a. below).
a. GRAPH
Pressing this soft key causes measurement results to be plotted, according to the
PLOTTER menus set up previously (see Sections 12.4.2 to 12.4.5 above).
If no results are being output to the plotter, for example because the Generator is
switched 'off', then pressing the GRAPH soft key merely enables the plotter by
putting it into the IDLE state. Plotting starts as soon as results become available,
e.g. when the Generator is switched 'on'.
Only the graph itself is drawn by means of this soft key; plot borders, axes, grid and
annotations are not output.
b. AXES
Pressing this soft key causes the borders, division marks (or grid if GRID is 'on'),
annotations (if TEXT is 'on'), and axes, to be plotted.
If the ORIGIN has been set to coincide with a corner of the plotting field, the axes will
not be separately visible in the plot.
c. MINIMUM and MAXIMUM
Pressing MINIMUM or MAXIMUM causes the plotting pen to move (in the 'up'
position) to the lower left-hand corner, or to the upper right-hand corner respectively,
of the plotting field defined in the [PLOTTER SCALING] menu (see Section 12.4.5
above).
These two soft keys can be used to check the size and position of the plotting field
before a plot is run.
d. ZERO
Pressing this soft key causes the plotter pen currently in use to be 'parked' in its
home position.
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