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Figure 1-9a. Establishing a Field Indicator Reference Standard | Up
TM-1-1500-335-23 Nondestructive Inspection Methods Manual | Next
SECTION VIII UT PROCESS CONTROL |
T.O. 33B-1-1
c.
Move the reference standard toward the magnet until a half-scale meter reading is obtained. (If the
south pole of the magnet is up, the meter needle will def lect to the right.)
d.
Mark this position on the sheet of paper by tracing along the bottom with a marker.
e.
Place an in-use field indicator in the exact position traced for the reference standard and note the
reading.
f.
Reject an in-use indicator if the meter reading obtained differs from that of the reference standard by
more than two units in either direction.
Figure 1-9b.
Checking In-Use Field Indicators
SECTION VII - Deleted
Change 3
1-51
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