7. Calibration
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MiniTest 2500 - MiniTest 4500
30 of 73
6. Adjust to the thickness of the calibration foil using the ARROW keys.
7. Press the Cal key in order to initialize the following calibration point.
‘CAL2’ flashes.
8. Repeat steps 5 and 6.
9.
Press the Cal key in order to initialize the following calibration point. ‘CAL3’ flashes. If the
OK key is pressed instead of the CAL key, the calibration procedure will be completed with
at the previous point.
‘Z 2’ is displayed.
10. Repeat steps 5 and 6.
11. Press the Cal key in order to initialize the following calibration point
. ‘CAL4’ flashes. If the
OK key is pressed instead of the CAL key, the calibration procedure will be completed with
at the previous point. ‘Z 3’ is displayed.
12. Repeat steps 5 and 6.
13. Press the OK key in order to confirm that calibration is completed
, ‘Z 4’ is displayed.
14. Now position the sensor on the coating to be measured and lift after the bleep.
It may be necessary to delete CAL calibration, e.g. after entry of a faulty calibration value
:
c)
Press CAL key followed by CLEAR key for some seconds. CAL calibration is now deleted.
ZERO calibration is now activated.
d)
Restart CAL calibration by repeating steps 4 to 13 above
.
Note:
Even while a series of measurements is being taken, foil calibration can be carried out as often as
necessary. The old calibration will be overwritten; the ZERO calibration remains in memory
.
Note:
Measurement of metallic coatings using sensor types F10, F20 or F50 requires a two-point
calibration. This may also apply to F type probes for smaller measuring ranges. Calibration
standards must be made of the same metal as the coating to be measured.
7.5 Two-point calibration using two calibration foils without zero
calibration
Applicable to all sensors (except CN02)
Calibration is only possible in single measurement mode. If necessary switch to the mode as in
section 4.1. This method requires the use of two different foils. The thicker one should be, if
possible, twice as thick as the thin one. According to probe, the following foils should be used:
F05, F1.6, FN 1.6, N02, N1.6 (as of production date
26.08.04):
min. 10µm
F10, N10:
min. 100µm
F20, N20:
min. 400µm
F50:
min. 1000µm (1mm)
N100:
min. 5000µm (5mm)
All other sensors:
min. 25µm
For best results, the thickness to be expected should be somewhere between the two calibration
values.