15
3.6.1 Static Calibration of the ZE
(Cont.)
3rd calibration point
:
- Hang a WEIGHT which corresponds to 90% of the tension range from the PROCESS
MATERIAL, vertically, as shown in fig. 3.6a.
- Push the THUMBPIECE as far as it will go in the direction of the arrow.
- Thread the PROCESS MATERIAL between the GUIDE ROLLERS and MEASURING
ROLLER as shown in fig. 3.6a.
- Slowly release pressure on the THUMBPIECE until the GUIDE ROLLERS return to
their original positions.
It is essential that the THUMBPIECE return slowly to its initial position.
Any uncontrolled snap-back may affect calibration and may also damage the
instrument.
Press the DAMP key.
As long as the DAMP key is depressed, the DISPLAY shows a decimal value which
is higher the third decimal value, e.g.
.
This decimal value may vary from instrument to instrument.
Release the DAMP key.
The tension meter then switches off after approx. 1 sec.
The new calibration has been stored.
The new calibration should be verified following the directions in Chapter 3.6.
If this procedure shows a deviation, you can recalibrate the tension meter again or re-
store the factory calibration as described in Chapter 3.6.2.
If the verification of the calibration according to Chapter 3.6 shows a deviation beyond
the allowable tolerance and a reliable operation is no longer allowed, the instrument has
to be returned to Hans Schmidt & Co GmbH for factory recalibration. Please follow the
shipping instructions given in Chapter 8.
3.6.2 Restoring the Factory Calibration
You can restore the factory calibration anytime with the following procedure:
Requirement
:
- Tension meter switched off.
To restore factory calibration
:
- Press the DAMP key untill the display shows a decimal value, than press additional
the OFF/ON key.. Keep the keys depressed for about 6 seconds until the DISPLAY
shows
E - 0
cN
.
- Release first the OFF/ON key and then the DAMP key.
- Press and hold the DAMP and OFF/ON keys again. Keep the keys depressed until
the DISPLAY shows
- - - -
cN
for about 1 sec. and the tension meter switches off.
The factory calibration has been restored.
