Pen Calibration - Instron 4400 Series Operator's Manual

(b) Use the VAR control to set the pen exactly on the left
edge of the chart. This will be more precise if the
chart is moving, since the pen will draw a line in-
stead of making a dot.
(c) Select a scale factor on the RANGE switch which
gives full scale deflection of the pen. Check that the
pen falls exactly on the right edge of the chart.

Pen Calibration

Pen calibration assures that the pen position coincides
exactly with the load cell signal. The method used to
calibrate the pen depends on the type of load cell in use.
If a self-identifying load cell is installed, the procedure
is to apply a precision calibration voltage to the pen
channel by closing the calibration relay, and then adjust-
ing the pen to the chart using the variable control on the
recorder. If a non-self identified load cell is installed, a
precision calibration weight is hung from the load cell
and the pen adjusted with the variable control. The spe-
cific procedures are as follows:
(a) If a non-self identified load cell is installed, hang a
precision weight, within the range of the load cell,
from the cell and observe the pen deflection. The
amount of pen deflection depends on the RANGE
switch setting, which sets the chart full scale value.
(b) Adjust the CAL variable control on the recorder to set
the pen to exactly the value of the precision weight.
(c) If a self-identified load cell is installed, the above proce-
dure can be used or, by closing the load cell calibration
relay, a precision load signal will be applied to the re-
corder (refer to the Note and Example below).
Strip Chart Recorder
6-9