7. Calibration
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MiniTest 2500 - MiniTest 4500
34 of 73
3.
Now take readings placing the sensor on the coating to be measured, lift after the bleep and
read the measuring value on the display.
It may be necessary to delete CAL calibration, e.g. after entry of a faulty calibration value
:
a)
Press CAL for several seconds and then CLEAR key for several seconds. CTC calibration
value is now deleted.
Note:
The default standard calibration for flat surfaces is now active.
a)
For a new CTC calibration repeat steps 2 -7. The previous calibration is deleted and the new
calibration is active.
7.7. Sensors N10 and N20
Switch on gauge.
The gauge automatically switches to „Continuous Mode“. This mode will be of
advantage when measuring wi
th the N10 and N20 probes. The “Continuous Mode“ will be
indicated by 3 strokes flashing (- - -) in the area of the measuring unit (µm, mm, cm). Readings
beyond the measuring range will be indicated by 3 steady strokes (
- - -
).
After the gauge has been switched on, the display will show
“INF“ and “Sensor in Air“. Hold the
sensor away from any kind of metal and press the key ZERO/
key for several seconds.
To switch to
“Single measurement mode“ press “Auto FN/ Cont“ for several seconds.
During calibration with N10 and N20 probes the dielectric properties of the calibration standard and
of the coating material must be taken into consideration
7.7.1 Standardization (Acquisition of Infinite Value)
Place the probe on the thicker of the two supplied standards, without any metal underneath. To
avoid any external dielectric influences, an effective base for the standard is a polystyrene block of
at least 3cm thickness and press ZERO/
key for several seconds.
7.7.2 Two-point calibration (zero setting plus one calibration foil)
2.
1.
Calibraton
standard
polysyrene
4.
5.
3.
ZERO steady
ZERO flashes
8.
6.
CAL steady
CAL flashes
Press ZERO key several seconds
Adjust thickness value
Lift sensor
Press OK key
n
x
7.
Press OK key
n
x
10.
9.
11.
13.
12.