Retrofit kit for dial indicator test devices
ed. 01/2017
page 23
7.2
Inspection procedure
Before you start testing, make sure that the lighting unit and the test device are switched on and ready for
operation, and that the test object is inserted in the test device and correctly positioned in front of the
lighting unit and the camera. Make sure that the test object is not damaged or dirty.
When QMSOFT®/QM-DIAL recognizes the camera connection, the live image of the test object opens.
7.2.1
Optical settings
Set the brightness (exposure time) as low as possible (approx. between a value of 3 and 10). This
can reduce the overall duration of the inspection procedure.
The scale of the test object should fill the camera image.
Make sure that the camera image is neither too dark nor too bright. Use the lens of the camera to
regulate the brightness; if necessary, make further adjustments with the slide control for
brightness.
Avoid disturbing lighting sources, which could cause reflections on the surface of the test object.
Make sure that the scale is always well illuminated and shadow-free.
Adjust the definition of the image with the focus regulation on the camera (Fig. 8).
7.2.2
Positioning of the tested dial gauge
7.2.2.1 Analogue dial gauges
Position the quill of the dial indicator test device, so that the test object is in a position shortly before its
mechanical pointer's zero point and make sure there is a contact between the quill of the test device and
the test object.
A symbol in the top left corner of the camera image shows the expected position of the "0"
(top, bottom, left or right). By clicking on this symbol the expected zero-position can be
changed (this setting remains also after closing the software).
The pointer has to be positioned in an area between a quarter turn before the "0" and a quarter turn after
the "0". There has to be a movement range of at least 30 scale units until the end of the measuring range
of the test object (dial comparator).
7.2.2.2 Digital dial gauges
To test digital dial gauges, set the display of the test object to zero close to the mechanical start of the
measuring range. Bring the quill to a position where the test object shows a value smaller than zero. The
dial gauge test device has to be in contact with the dial gauge to be tested.
The „0“ always has to be within the measuring range of the test object.
There have to be at least 5 digits before the "0" in the measuring range (usually it is possible to set digital
measuring devices to zero at any point).
There has to be a movement range of at least 30 digits until the end of the measuring range.
