Service manual

Chapter 8: Performance Testing 61
Axial Measurement Accuracy
Note: Measurements must be performed while the image is frozen.
Lateral Measurement Accuracy
Set Up Axial
Measurement
Accuracy
1Acquire the image.
2 Press the Freeze key.
3 Press the Caliper key. The caliper appears on the image display. (See the Edge Ultrasound
System User Guide, if necessary, for caliper operation.)
4 Use the touchpad to position one of the calipers.
5 Press the Select key to fix the caliper and enable the other caliper.
6 Use the touchpad to move the other caliper. The results update as you move the caliper, and
the measurement is complete when you finish moving the calipers. (Press the Select key to
alternate the active caliper, and adjust the measurement with the touchpad.)
Test Axial
Measurement
Accuracy
1 Measure the distance, center to center, of any two pins that are 5-12 cm apart vertically.
2 Verify that the distance measured is within the tolerance listed in Table 8.1.
Set Up Lateral
Measurement
Accuracy
Perform “Set Up Axial Measurement Accuracy” on page 61.
Test Lateral
Measurement
Accuracy
1 Measure the distance, center to center, of any two pins that are 4-10 cm apart horizontally.
2 Verify that the distance measured is within the tolerance listed in Table 8.1.
3 Press the Freeze key to return the system to live 2D mode.
Table 8.1: System Measurement Accuracy
Measurements Tolerance
Axial Distance +/- 2%
Lateral Distance +/- 2%