(d) Press the Pen Lift switch to the Up (pen up) position.
(e) Place a sheet of chart paper on the platen of the Re-
corder with the lower edge of the sheet against the
bottom paper stop, and its left edge against the left
paper stop. Press the Paper Hold-down switch to the
Down (On) position.
(f) Press the X-Y/Y-T MODE switch to the Up position
for X-Y operation, or to the Down position for Y-T
operation.
Calibration
Calibration of the Recorder consists of setting the pen
position for zero and full-scale on the chart. Pen calibra-
tion assures that the pen position coincides exactly with
the transducer (load cell or extensometer) signal. The
method used to calibrate the pen depends on the type of
transducer in use.
If a self-identifying transducer is installed, the procedure is
to apply a precision calibration voltage to the pen channel
by closing the calibration relay, and then adjusting the pen
to the chart using the variable control on the recorder.
If a non-self identified transducer is installed, a precision
calibration weight is hung from the load cell, or an exten-
someter calibrator displaces the extensometer a known
amount, and the pen is adjusted with the variable control.
When the zero and full scale pen positions fall exactly at
the edges of the chart, the scale divisions printed on the
chart can then be used to accurately determine the value
of all other points on the test curve.
System Options
X-Y Recorder
6-19
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