(f) If a self-identified transducer is installed, closing the
transducer calibration relay will apply a precision
transducer signal to the recorder (refer to the Note
and Example below).
(1) To close the load cell or extensometer relay, press
the LOAD CAL or STRAIN CAL key on the
Model 4400 front panel, then press 0 and ENTER.
The LOAD CAL and LOAD BAL or STRAIN
CAL and STRAIN BAL LEDs are both lit when
this relay is closed.
(2) Using the VAR screwdriver adjustment on the Re-
corder Module, adjust the pen position exactly to
the calibration voltage.
(3) IMPORTANT – After setting pen deflection, open
the calibration relay by repeating the key sequence
to close the relay: press LOAD CAL, 0, ENTER or
STRAIN CAL, 0, ENTER on the keypad. The
LOAD CAL and LOAD BAL or STRAIN CAL and
STRAIN BAL LEDs go out. A test cannot be started
when the calibration relay is closed.
Note
The voltage generated when the load calibra-
tion relay is closed is the same as would be
produced by an applied load equal to 50% of
the maximum capacity of the cell when using
SI units, as shown in Table 6-3. In Metric units,
the calibration voltage is 50.9% of full scale,
while in U.S. Customary units, this voltage is
56.2% of full scale (51.6% for 600 kN Load
Cells).
AS-1
System Options
X-Y Recorder
6-21
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