Preventing False Minimum/Maximum Thickness Readings; Using Alarms - Olympus 45MG User Manual

The minimum and maximum thickness modes display the smallest and largest
thickness value measured from the time you activate or reset the minimum mode. The
modes are useful when determining the thinnest/thickest reading obtained while
making a series of readings on a test piece.
To activate the minimum, maximum, or min/max mode
1. In the measurement screen, press [SETUP], and then select MEAS.
2. In the MEAS screen, set MIN/MAX to the desired mode (OFF, MIN, MAX, or
BOTH).
3. Press [MEAS] to return to the measurement screen.
4. In the measurement screen, press [MEAS] again to reset the held minimum,
maximum, or min/max values.
The thickness display will blank, indicating that the old MIN/MAX value is reset.
Saving or sending a MIN/MAX reading also resets the value.
7.3

Preventing False Minimum/Maximum Thickness Readings

A false minimum or maximum reading can occur when you lift the transducer from
the test piece. This is due to excess couplant (particularly on smooth surfaces), which
causes the instrument to read the thickness of a couplant drop when you lift the
transducer.
To prevent false minimum/maximum thickness readings
1. Activate the minimum or maximum thickness mode (see "Using the Minimum,
Maximum, or Min/Max Thickness Mode" on page 129).
2. Before uncoupling the transducer, press [FREEZE] to freeze the measurement or
optional waveform.
3. Once the transducer is uncoupled, press [FREEZE] again to unfreeze the display
and recall the minimum thickness and optional waveform.
7.4

Using Alarms

Any one of the 45MG alarm modes can be activated to help you identify when the
actual thickness measurement is above or below editable reference values.
When an alarm condition occurs, the 45MG warns you, as follows:
DMTA-10022-01EN, Rev. C, January 2015
Using Special Functions 131