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Chapter 8. Servicing the PT878
166 Transport® Model PT878 Portable Liquid Flowmeter User’s Manual
Dual-Point Calibration (cont.)
1. Press the [T] arrow key to enter the window.
2. The first prompt asks you to choose between single and dual-point
calibration. Use the [
W] and [X] arrow keys to move to the Dual radio
button and press
[ENTER].
3. The next prompt asks you to enter the length of Block 1. (If you are
using a GE-supplied test block, the length is printed on the block.)
a. Press [ENTER] to open the text box.
b. Use the numeric keys to enter the length.
c. Press [ENTER] to confirm the entry.
4. Press [X] to move to the Calibrate button, and press [ENTER] to
prepare for calibration. Then apply couplant B to the Block 1 surface,
and hold the transducer against the block.
5. When you have the transducer firmly pressed against the block and the
Ready button appears, press
[ENTER] again to perform the calibration.
Note: For single-point calibration, skip to step 9.
6. The next prompt asks you to enter the length of Block 2.
a. Use the arrow keys to move to the Block 2 text box.
b. Press [ENTER] to open the text box.
c. Use the numeric keys to enter the length.
d. Press [ENTER] to confirm the entry.
7. Press [X] to move to the Calibrate button, and press [ENTER] to
prepare for calibration. Then apply couplant B to the block surface, and
hold the transducer against the block.
8. When you have the transducer firmly pressed against the block, press
[ENTER] (Ready button) again to perform the calibration.
9. Hold the transducer steady until the Set button appears. Press [ENTER]
to store the calibration.