17
3.9 Static Calibration of the ETB (Cont.)
- Thread the process material through the MEASURING- and GUIDE ROLLERS as
described in Chapter 3.4.
- Slowly release pressure on the LEVER until the outer rollers return to their
original position.
- Before starting the calibration, move the instrument slowly up and down to compensate
for possible mechanical friction losses and thus ensure repeatability of the
measurements.
c)
Press the RECALL key.
As long as the RECALL key is depressed, the DISPLAY shows a decimal value which is
higher than the second decimal value, e.g.
8000
cN
.
This decimal value may vary from instrument to instrument.
- Release the RECALL key when the value shown on the DISPLAY is stable (the reading
might fluctuate greatly).
The DISPLAY shows
E 100
cN
4th calibration point
:
- Hang a weight which corresponds to 100% of the tension range from the measured
material, vertically, as shown in fig. 3.9
- Press the LEVER down all the way.
- Thread the process material through the MEASURING- and GUIDE ROLLERS as
described in Chapter 3.4.
- Slowly release pressure on the LEVER until the GUIDE ROLLERS return to their
original position.
- Before starting the calibration, move the instrument slowly up and down to compensate
for possible mechanical friction losses and thus ensure the repeatability of the
measurements.
d)
Press the RECALL key.
As long as the RECALL key is depressed, the DISPLAY shows a decimal value which is
higher than the third decimal value, e.g.
9500
cN
.
This decimal value may vary from instrument to instrument.
- Release the RECALL key when the value shown on the DISPLAY is stable (the reading
might fluctuate greatly).
e
) Press the RECALL key.
- Release the RECALL key.
The DISPLAY
switches off after approx. 1 sec.
The new calibration has been stored.
- Press the POWER key.
The instrument switches off.
Verify the new calibration, following the directions in Chapter 3.7.
If this procedure shows a deviation, you can recalibrate the tension meter again or
restore the factory calibration as described in Chapter 3.9.1.
If the verification of the calibration according to Chapter 3.7 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.