GE USM 36 Series Technical Reference And Operating Manual page 14

Contents
PRF MODE (pulse repetition frequency) 5-16
5.6 Setting the receiver
(function group RECEIVER). . . . . . . . . 5-18
FREQUENCY . . . . . . . . . . . . . . . . . . . . . 5-18
RECTIFY. . . . . . . . . . . . . . . . . . . . . . . . . 5-19
DUAL (pulser-receiver separation) . . . . . 5-19
REJECT . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
5.7 Setting the gates
(function groups GATE A
and GATE B) . . . . . . . . . . . . . . . . . . . . . 5-21
Tasks of the gates. . . . . . . . . . . . . . . . . . 5-21
A-START/B-START
(starting point of the gate) . . . . . . . . . . . . 5-22
A-WIDTH/B-WIDTH
(width of the gates) . . . . . . . . . . . . . . . . . 5-22
A-THRESHOLD/B-THRESHOLD
(response and measurement
threshold of the gate) . . . . . . . . . . . . . . . 5-23
TOF MODE . . . . . . . . . . . . . . . . . . . . . . . 5-24
Starting point of gate B . . . . . . . . . . . . . . 5-26
Automatic gate height . . . . . . . . . . . . . . . 5-27
0-14
5.8 Calibrating the USM 36 . . . . . . . . . . . . . 5-28
Calibrating the display range. . . . . . . . . . 5-28
Choice of the measuring point . . . . . . . . 5-28
Calibration with straight-beam and
angle-beam probes . . . . . . . . . . . . . . . . . 5-29
Calibration using dual-element probes . . 5-33
5.9 Making measurements . . . . . . . . . . . . . 5-36
General notes . . . . . . . . . . . . . . . . . . . . . 5-36
5.10 dB-difference measurement
(function group dB REF) . . . . . . . . . . . 5-37
Recording a reference echo . . . . . . . . . . 5-38
Deleting a reference echo . . . . . . . . . . . . 5-38
Echo height comparison . . . . . . . . . . . . . 5-39
5.11 Rating of welds
(function group AWS D1.1) . . . . . . . . . 5-40
Rating of welds according to
AWS D1.1 . . . . . . . . . . . . . . . . . . . . . . . . 5-41
5.12 Flaw position calculation with
angle-beam probes . . . . . . . . . . . . . . . . 5-44
PROBE ANGLE . . . . . . . . . . . . . . . . . . . 5-45
Issue 2 (12/2013) USM 36