Chapter 2. Instrument Setup
58
DMS Go Operator’s Manual
2.4.2b Setting the Ultrasonic Detection Mode (PROBE & CAL - TG MODE)
The DMS Go performs all measurements in zero-crossing mode, at the point where the signal crosses the zero amplitude line. The available
modes will vary with the probe used.
IMPORTANT:
Not all modes are available for all probes!
1.
In the
MAIN
menu, scroll to the
PROBE & CAL
submenu using the joystick (
).
2.
Use the joystick (
) to select the function titled
TG MODE,
and then to select the mode. Six options are available:
•
S-IP — This mode indicates that a single-element type transducer is connected to the
DMS Go
. It starts ultrasonic detection from an
artificial point relative to the pulser firing (IP, initial pulse, or “T0”) and ends with the last zero crossing before the first detected
flank crossing in gate-A. The corresponding TOF is compensated by the probe zero offset (P-delay), calculated automatically
during the calibration process. The
DMS Go
calculates and displays a thickness result value from the acquired data. It is used with a
single-element probe to test thickness in non-coated materials, especially those with smooth, parallel surfaces.
•
S-PEAK — This mode indicates that a single-element type transducer is connected to the
DMS Go
. It starts ultrasonic detection from
the last zero crossing before the peak in gate A and ends with the last zero crossing before the peak echo in gate-B. The
DMS Go
calculates and displays a thickness result value from the acquired data. It is used with a single-element probe to test thickness in
coated materials, especially those with smooth, parallel surfaces.
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