13
Setting Alarm Thickness Limits
The R7900 will alarm when the measured value is beyond the pre-set
limits. When the measurement is lower than the low pre-set limit or higher
than the high pre-set limit, the alarm will sound. To enter the alarm setting,
follow steps 1 through 6 below.
1. Press the
button to highlight the "Alarm" setting on the LCD.
2. Press the
button to adjust the LOW limit.
3. Press the
and
buttons to adjust the user defined LOW
alarm value.
4. Press the
button to save the LOW limit, and to set the HIGH limit.
5. Press the
and
buttons to adjust the user defined HIGH alarm
value, and press the
button to save the HIGH limit.
6. To exit the limit setting, press the
button or by carrying out
a measurement.
Minimum Capture Measurements
When the ultrasonic sensor couples with the test piece it will display the
current measurement. When it is lifted away it will display the minimum
value of the measurement carried out while the MIN Indicator flashes for
several seconds. Measurements taken during the MIN indictor flashing
cycle will continue to be part of the minimum value capturing. If you carry
out measurements after the MIN Indicator stops flashing the minimum
value capturing will re-start. The MIN indicator will only display when the
minimum capture function is ON (see
System Setup
section for details).
Measurement Methods
There are three base measurement methods:
1.
Single measurement method
: This method involves measuring the
thickness at a single point.
2.
Double measurement method
: This method
involves performing two thickness measurements
near a single spot rotating the ultrasonic sensor
from 0 to 90° respectively, with respect to the split
face (see Figure A).Take the smaller of the two
indicated values as the thickness of the material.
continued...
90º
Figure A
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