Press [OFF/Test] to switch the instrument off. Turn ‘Voltage’
and ‘Sensitivity’ fully anti-clockwise.
4.6 Set the Test Voltage.
Holding the probe in free air press ‘ON’ to turn the detector
on.
Turn ‘Voltage’ clockwise until the required test voltage is
indicated on the LCD display. See Section 5.0 for background
information on the Test Voltage.
4.7 Set Alarm Sensitivity.
Use ‘Sensitivity’ to set the sensitivity.
‘Sensitivity’ turned fully clockwise gives the maximum
detector sensitivity and the lowest threshold current
‘Sensitivity’ turned fully anti-clockwise gives the minimum
detector sensitivity and the highest threshold current
See Section 5.0 for background information on Sensitivity.
4.8 Detecting Holidays and Other Coating Flaws.
Place the probe on the test surface. Keep the probe in
contact with the surface and move it at a speed of
approximately one metre every four seconds, 0.25m/s (10"/s).
One or more of the following indicates a flaw:-
- A spark between the probe and the surface
-‘ALARM’ indicator flashes
- The audible alarm sounds
- The output voltage, indicated on the LCD display, drops
substantially
- The probe neon indicator glows
4.9 Moving Work Position and Finishing Work.
Always turn the detector off and set the voltage to zero before
disconnecting the leads, when work is finished or when leaving
work unattended.
When the earth has been attached at its new position, the
connections should always be checked. See Section 4.5.
7
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