5 Operation
Evaluation according to the DGS method
5-124
Issue 2 (12/2013)
USM 36
Change in the probe delay with DGS
Generally, a change in the probe delay automatically
also affects the shape of the sound field. This means
that a new recording of the reference echo for the DGS
setting would be theoretically required. However, minor
changes in the delay line, typically occurring due to the
wear of the delay line, have no noticeable effect on the
programmed distance laws.
ATTENTION
An existing DGS setting no longer applies if
the probe delay changes to a larger extent,
e.g. caused by adding or removing a delay
line after recording a DGS reference echo
before changing the delay line.
The same applies to immersion testing: The
DGS setting must be made after setting up
the final water delay line.
Failure to do so may lead to evaluation er-
rors.
Automatic variation of the measuring point in TOF
mode
An echo amplitude evaluation is normally carried out at
the echo peak of the signal under examination because
this is the only way of ensuring that the displayed echo
amplitude and the sound path (projection distance,
depth position) always belong to the highest echo in the
gate.
Note
The USM 36 checks the measuring point set-
ting in TOF mode before processing any ref-
erence amplitudes. If
PEAK
is not set as
measuring point, the instrument will automat-
ically switch to
PEAK
. In this case, a note is
displayed at the bottom edge of the display
screen.
Summary of Contents for 37 400
Page 1: ...USM 36 Technical Reference and Operating Manual ...
Page 5: ...USM 36 Issue 2 12 2013 0 5 Second operating level ...
Page 6: ...0 6 Issue 2 12 2013 USM 36 Second operating level continued ...
Page 10: ...0 10 Issue 2 12 2013 USM 36 ...
Page 20: ...0 20 Issue 2 12 2013 USM 36 ...
Page 21: ...USM 36 Issue 2 12 2013 1 1 Introduction 1 ...
Page 35: ...USM 36 Issue 2 12 2013 2 1 Standard package and accessories 2 ...
Page 40: ...2 Standard package and accessories Recommended accessories 2 6 Issue 2 12 2013 USM 36 ...
Page 41: ...USM 36 Issue 2 12 2013 3 1 Initial start up 3 ...
Page 53: ...USM 36 Issue 2 12 2013 4 1 Principles of operation 4 ...
Page 76: ...4 24 Issue 2 12 2013 USM 36 ...
Page 77: ...USM 36 Issue 2 12 2013 5 1 Operation 5 ...
Page 212: ...5 136 Issue 2 12 2013 USM 36 ...
Page 213: ...USM 36 Issue 2 12 2013 6 1 Documentation 6 ...
Page 242: ...6 30 Issue 2 12 2013 USM 36 ...
Page 243: ...USM 36 Issue 2 12 2013 7 1 Maintenance and care 7 ...
Page 249: ...USM 36 Issue 2 12 2013 8 1 Interfaces and Peripherals 8 ...
Page 253: ...USM 36 Issue 2 12 2013 9 1 Appendix 9 ...
Page 268: ...9 16 Issue 2 12 2013 USM 36 9 4 Recycling directives Overview 5 4 4 5 6 1 7 3 2 3 ...
Page 273: ...Recycling directives 9 Appendix USM 36 Issue 2 12 2013 9 21 6 6 6 ...
Page 274: ...9 Appendix Recycling directives 9 22 Issue 2 12 2013 USM 36 7 7 8 6 8 ...
Page 279: ...USM 36 Issue 2 12 2013 10 1 Specifications 10 ...
Page 289: ...USM 36 Issue 2 12 2013 11 1 Index 11 ...
Page 305: ...11 Index USM 36 Issue 2 12 2013 11 17 Z Zoom 4 3 ...