Solartron 1250 - The [PLOTTER X-AXIS] and [PLOTTER Y-AXIS] Menus

Recording, Learning and Storing Facilities 1250 Frequency Response Analyzer
12-16 SH/1250/3
12.4.4 THE [PLOTTER X-AXIS] AND [PLOTTER Y-AXIS] MENUS
Set up the [PLOTTER X-AXIS] and [PLOTTER Y-AXIS] pages of the DISPLAY/
PLOTTER menu.
The four soft keys and their selections are identical for both pages:
ITEM MINIMUM MAXIMUM ORIGIN
[ a ] ( ) ( ) ( )
[ b ]
[ r ]
[ θ ]
[ log r in dB ]
[ f in Hz ]
[ log f in Hz ]
a. ITEM
The item to be plotted on each axis is entered via this soft key, the default item being
[a], the real component of amplitude.
There are over 40 different possible combinations of X- and Y-items selectable via
the ITEM soft key, but two commonly required types of plot, Bode and Nyquist, are
detailed in Section 4.7 below.
With SCALE selected to be [fixed] (see Section 12.4.5 below) the shape of the plot is
rectangular if the X-axis ITEM is set to [f in Hz] or [log f in Hz], but square in all
other cases.
For this example plot, set the X-axis ITEM to [f in Hz] and the Y-axis ITEM to [r].
Note: The choice of items plotted is not affected by the display coordinates selected.
The source channel(s) for the items plotted is that set for the Display.
b. MINIMUM and MAXIMUM
These soft keys enable the user to set the full-scale range of items to be plotted in
the X- and Y-directions.
When the MINIMUM soft key, for example, is pressed the Display becomes:
MINIMUM not entered (+ )
Key in the required value, which appears between the round brackets, and press
ENTER. Subsequent pressing of MINIMUM will display the selected value in place
of 'not entered'.
For the present example plot, set the X-axis MINIMUM to 0 and the MAXIMUM to 17.
Set the Y-axis MINIMUM to - 1 and the MAXIMUM to 10. These settings allow a
small margin outside the expected ranges of values to be plotted, and avoid plotted
points coinciding with the graph borders.
c. ORIGIN
The values entered via the ORIGIN soft key for the X-axis and Y-axis menus
determine the point of intersection of the two axes i.e. the origin of the graph. This
may be set anywhere within the plotting area. Choice of origin position does not
affect the positions of plotted points, or the division markings at the graph borders.