GE PT878GC Manual de usuario Pagina 216

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Servicing the PT878GC 9-15
April 2004
Calculating Velocity (Pipe Material Sound Speed)
(cont.)
2. To enter the block length (here, the thickness of the sample as
measured with a caliper or calibrated sample), press the [
T]
arrow key and then press
[ENTER] to open the Block Length
text box. Use the numeric keys to enter the measured block
length. Press
[ENTER] to confirm the entry.
3. Prepare the sample for calibration by applying couplant B to
its surface, and press
[ENTER]. The screen now appears
similar to Figure 9-11 below.
4. Hold the transducer steady against the sample, and wait for the
Set button to appear.
5. To calibrate the gauge, press the [
T] arrow key to move to the
Set button.
6. Press
[ENTER] (Set button) to start the calibration sequence.
Figure 9-11: The Velocity Window,
Displaying the Calculated and Current Values
Display
Thickness Gauge Measure
Cancel OK
Velocity
Graph Zero
Material
Block Length
Calculated
Current
1
Press Set to Commit Value
Set
22129. 74733.
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