Chapter 4. Measuring and Recording Data
DMS Go Operator’s Manual
87
4.1.2
Selecting the Measurement Method (MEASURE - MODE)
The DMS Go can perform thickness measurement and corrosion monitoring in five modes:
•
A-Scan
-
Display in which the echo amplitude is shown in the y-axis and the transmit time (also shown without echoes) and the pulse
travel time is shown in the x-axis. It provides a graphical display of the echoes used to measure thickness.
•
B-Scan
-
Two-dimensional graph in which travel time is shown in the vertical axis and transducer movement in the horizontal axis.
If you select B-Scan, the Measure menu has two additional options:
•
TIMEOUT
- The time that elapses, once a probe is uncoupled from the DMS Go, before the B-scan stops. (During the timeout period,
the battery icon in the upper right corner fills with yellow.) The B-scan mode will allow you to map the thickness profile of the
material being tested over a period of time. The thickness mapping procedure may be briefly interrupted during this time period. The
maximum length of this interruption of data collection is controlled by the TIMEOUT feature, which can be set from 0 to 15 seconds.
•
TIME
— The duration of a B-scan (from 7 to 30 sec).
Use the joystick to adjust these parameters.
•
Min/Max
- Display of minimum and maximum values. This mode relies on a sequence of readings. On the left of the screen, it always
shows the minimum value of the sequence; on the right, it shows the maximum value. The large reading in the center is the current
value. If the probe is uncoupled for several seconds, the sequence is terminated. When you resume in Min/Max, the DMS Go starts a
new sequence. This mode aids in determining the stability of your actual reading(s) or the overall deviation of the thickness in your test
piece while scanning.
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