Performing A Direct Recording (Versus Chan3) - HP 7090A Operator's Manual

Performing a Direct Recording (Versus-Chan3)
Channel 1 or 2 may be plotted against Channel 3 in the direct recording
mode. The procedure is similar to that for direct versus-time recordings .
However, for versus-chao3 direct recordings that are manually triggered,
the setting has no affect on the duration of the recording. This
TOTAL TIME
feature allows a continuous, free-running measurement, for which lowering
and lifting of the pen and termination of the measurement are performed
manually_
To perform a versus-chan3 direct recording:
1. Select Channel 1 or 2 as the Y-axis variable. Select
X-axis variable.
2. Prepare an appropriate recording area as follows. (Refer t o Chapter 3 for
details.)
a. Position and
ZERO
h.
Set and
RANGE OFFSET
c. Set for time-limiting of the recording (external or internal
TOTAL TIME
trigger mode only).
d. Grid the recording area.
settings are ignored for manually· triggered measurements.
TOTAL TIME
For external or internal triggering,
24 hours may be used to select the recording duration. If a total time of
less than 1 second is selected, the HP
second and perform a I·second recording when the trigger is received.
3. Select an appropriate pen color using the
4. Use the
mode selector to select the desired trigger mode.
TRIGGER
For manual, front-panel triggering, select the
nal or internal trigger modes may also be selected for direct recordings,
as well as post·trigger time delays. These trigger modes and operations
are described in Chapter 5.
5. Press
to initiate the trigger search.
RECORD DIRECT
The pen holder and paper
ing area's zero point. The HP
with the pen raised until the trigger is received, at which time the pen
will lower and draw the plot.
To start recording for the manual trigger mode, press
pen in the "down" position. (pressing
"up" position.) The pen may also
pen connect ion described on the following page.
FULL SCALE.
for the selected X - and Y-axis channels.
TOTAL TIME
7090 will reset
PEN SELECT
will
move so that the pen is above the record­
7090 will then respond to the X,V input
PEN UP
be
controlled remotely using the external·
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CHANNEL 3 as the
settings of 1 second to
to 1
TOTAL TIME
pushbuttons.
mode. The exter­
MANUAL
to latch the
PEN ON
will
latch the pen in the
Perfonning Direct and Buffered Recordings
Select the )(. alld
•
• •
Y-Axis V(lfiables
Prepnre the
Recordillg Area
Select Ihe
Trigger Mode
•
•
Initiate the
Trigger Scarrh
Recording
4-3