SETUP AND CALIBRATION
Your 758 indicator in a NEMA 4X enclosure has been thoroughly tested and calibrated before
being shipped to you. If you receive the indicator attached to a scale, calibration is not
necessary. If the 758 is being connected to a scale for the first time or recalibration is necessary
for other reasons, proceed as indicated.
The calibration switch is located on the enclosure rear panel. To gain access to this switch, first
remove the calibration access screw on the rear panel. (See Figure No. 18)
Once you have located the calibration switch, with a screwdriver or other tool inserted through
the calibration switch access hole on the rear panel, press the push button calibration switch,
then press ON / OFF and release. When intint= is displayed, release the push button switch. The
758 is now ready for setup and calibration. Proceed with the calibration instructions on page 7.
CALIBRATION SEAL INSTALLATION
If your Model 758 Weight Indicating Instrument in the NEMA 4X enclosure is used in a
commercial application it must be tested and sealed by your local weights and measurement
official. The 758 NEMA 4X enclosure is designed to accept a lead and wire security seal to
prevent unauthorized access to the calibration adjustments. Refer to the Figure No. 18 for details
on the installation of the seal.
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Figure No. 18
Calibration Access Screw
Calibration Seal
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