Specifications

USN52 L Operating Manual Page 67
9. Calibrating the A-scan Display
5. Set RANGE to 10.00 in:
6. Couple the probe to the IIW block as shown at right and op-
timize the echo signal from the 4 inch radiused surface.
7. Adjust GAIN as necessary throughout this procedure to keep
reference echo signals at suitable levels (see illustration at
right):
,
8. Set MTL VEL to 1320 in/s: ,
9. Adjust ZERO (S-CAL menu) to place the leading edge of the
first echo signal from the 4 inch radius at the fourth vertical
graticule division (see illustration at right):
10. If necessary, switch to fine MTL VEL and place the leading
edge of the second echo signal from the 4 inch radius at the
ninth vertical division (see illustration at right):
,
11. If necessary, repeat steps 9 and 10 until both echo
signals are positioned horizontally as shown in the
illustration at right.
Probe
Probe Position for Step 6
Echo Signals at Divisions 4 and 9