3.4 TAKING READINGS
Having previously ascertained the correct channel for a particular lacquer
type readings are easily taken by placing the unknown samples in or under
the probe and noting the value displayed whilst the correct channel is
selected.
Channels are selected by using the up and down keys or alternatively by
pressing the
LACQUER NUMBER
key and entering the channel number on
the keypad followed by the
ENTER
key.
3.5 READING FAULTS
If the FAULT indicator illuminates and the display reads "Poor" then a pinhole
or missing lacquer exists on the sample currently being measured.
If no channel suits the known sample or a reading is significantly different to
the expected value then check the following;
1)
The probe crocodile clip is making good contact with the
metallic substrate of the sample.
2)
The probe is being used correctly i.e. square to the sample with
the correct pressure applied.
3)
The probe tip is clean and undamaged.
4)
Probe connections are O.K. and operators hands are not in
contact with conductor of probe wire.
It should be noted that the gauge is believed capable of coping with the
complete range of lacquer types and film weights used by the can, ends and
lids industries, excepting those with high metallic content.
Whilst a valid reading is not being obtained from the sample the display will
show "void". If no reading can be obtained by placing the probe on the
sample then check items 1 to 4 above.
Summary of Contents for SI9500
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