Scaling And Drawing The Recording Area Grid - HP 7090A Operator's Manual

Scaling and Drawing the Recording Area Grid

(Preparing the Recording Area: Step 4)
3-16 Measurement Setup Operations
1.
Set RANGE equal to
Set OFFSET equal to twice the range setting computed in step
2.
negative offset if V n>t<I is positive; use a positive offset if V � is negative.
The following example illustrates this procedure. Shown is a signal having
a median voltage
Using the range and offset equations results in values that violate the
second offset restriction. Applying the two steps given above resolves the
problem and furnishes optimum range and offset values for the signal.
and
an
40V
RANGE " %I Vma)( - Vmlnl OFFSET
BUT
IOFFSETI
• • ,
(RESTRICTED CONDITION)
SO SET
1 .
(NEGATIVE OFFSET USED BECAUSE Vmed
2.
The fi n al procedure in preparing a recording area involves scaling and
drawing the grid, which provides the customized graph paper onto which
the measurement is plotted. The following steps, which are detailed in this
section, are used to scale and draw a recording area grid:
1. The GRID DIVISIONS selections on the setup conditions menu are used to
specify the number of
on each selected recording area quadrant.
2. The quadrants on which the specified grid is to be drawn are selected
using the quadrant-select function (a multi-pushbutton operation).
3. The grid is drawn by pressing the DRAW GRID pushbutton.
These steps enable you to draw a recording area grid suited. to the measure­
ment application at hand. A grid may be drawn that correlates to the
scaling and confi g uration of the recording area, and any available pen
be
rolor may used. The grid-drawing operations arc discussed in detail in
the following paragraphs.
Scans by ArtekMedia © 2007
I
113 I 1/31Vminl.
V m"" or
50
V mtd
of volts and a peak-to-peak range of
Vmin
_ _ _ _ _ _ _
-40j
.. y.l60
" 1 0 VOLTS
X RANGE
>2
RANGE IVmexl VOLTS
. • .
OFFSET a � R ANGE· -40 VOLTS
20
a
2 X
a
X-
and Y-axis grid divisions which will be created
whichever is greater.
1. Use a
20
APPLY RANGE
I)
AND OFFSET
EQUATIONS
!Vmax" Vmin)
- _l'..
(60 40)
-+-
%
.. -50 VOLTS
.. -
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