Defining The Axes/Channel Selection - HP 7090A Operator's Manual

Defining the Axes/Channel Selection

(Preparing the Recording Area: Step 1)
Measurement Setup Operations
;3-2
Before plotting a measurement,
appropriate for the application. Preparing a recording area accomplishes
several tasks - it defines the axes, boundaries, and scaling of the coordi­
nate system; matches the sensitivity and range of the HP
signal voltage(s); and establishes the recording time.
The procedures involved in preparing a recording area can be grouped into
the following four steps:
1. Defining the axes.
SELECT push buttons. For the preceding illustration,
for the Y-axis; TOTAL TIME
2. Establishing the recording area boundaries.
tem quadrants required for plotting are determined and the location and
size (boundaries) of the recording area are specified on the plotter paper
by positioning the zero and full·scale points.
Because the Channel l input signal used for the illustration consisted of
positive voltages, only Quadrant
X-axis values) was required. The actual area intended for the quadrant
was then established on the plotter paper.
3. Scaling the recording area boundaries.
X- and Y-axes is defined by specifying appropriate setup condition
values.
In the example, RANGE 1
1 input) to 0.0-6.0 volts.
the X ·axis (time) to 0.0-50.0 milliseconds.
4. Scaling and drawing the recording area grid.
grid divisions is selected using the
the grid is drawn. For the example, each Y-axis grid division represents
0.5 volt; each X·axis grid division represents 2.0 milliseconds.
The following four sections detail how to perform the four steps outlined
above. Although the steps can be performed in other sequences, the order
given here permits a logical presentation ofthe material. With the informa­
tion in these sections, you will be able to design a suitable recording area
for nearly any measurement application.
Measurements made using the HP
versus·chan3, depending upon the assignment of the X·axis variable. For
versus-time measurements, time is assigned to the X·axis; the Y-axis is
reserved for the channel input signal(s). For versus-chan3 measurements,
the Channel 3 input signal is assigned to the X·axis, and Channel l and/or
2 is assigned to the Y·axis. The following figure shows the axes defined for
both measurement types.
Scans by ArtekMedia © 2007
a recording area should be prepared that is
The X- and Y-axes are defined using the
was selected for the X-axis.
I
(positive Y·axis values and positive
The scaling (limits) of the
was set at 6.0 volts to scale the Y-axis (Channel
TOTAL TIME was set to 50.0 milliseconds
GRID DIVISION
may be classified as
7090
7090 to the input
CHANNEL
was selected
CHAN 1
The coordinate sys­
to
scale
•
The scaling for the
setup conditions, and
or
versus·time
•
'