GE Krautkramer USM 35X, Operator'S Manual

Page: 127 / 226

Krautkramer USM 35X Issue 01, 04/2005 5-79
Operation
made to change the value because, in fact, a valid
reference echo already exists.
In addition, a different reference reflector type has been
used in the DGS menu below: instead of a backwall, a
circular disk (flat-bottom hole) having a diameter of
3 mm has been set in this case. In this case, of course,
the reference echo has to be received from a 3 mm
circular disk.
After switching on the DGS curve, the reference echo
must therefore clearly touch the 3 mm curve.
Evaluation according to the DGS method (only USM 35X S)
A side-drilled hole can also be used as a further refer-
ence reflector with some limitations. It must have a
diameter corresponding to at least 1.5 times the wave-
length used, and the distance must be 1.5 times the
near-field length. The USM 35X S will check these con-
ditions if you aim to use a side-drilled hole as reference
reflector, and will issue an error message if required.
The table on the next page indicates these minimum
data for the existing probes in steel.
Conditions for the use of side-drilled holes as reference
reflectors in steel. For other materials, the values must
be converted accordingly.
Krautkramer USM 35X Issue 01, 04/2005 5-79
Operation
made to change the value because, in fact, a valid
reference echo already exists.
In addition, a different reference reflector type has been
used in the DGS menu below: instead of a backwall, a
circular disk (flat-bottom hole) having a diameter of
3 mm has been set in this case. In this case, of course,
the reference echo has to be received from a 3 mm
circular disk.
After switching on the DGS curve, the reference echo
must therefore clearly touch the 3 mm curve.
Evaluation according to the DGS method (only USM 35X S)
A side-drilled hole can also be used as a further refer-
ence reflector with some limitations. It must have a
diameter corresponding to at least 1.5 times the wave-
length used, and the distance must be 1.5 times the
near-field length. The USM 35X S will check these con-
ditions if you aim to use a side-drilled hole as reference
reflector, and will issue an error message if required.
The table on the next page indicates these minimum
data for the existing probes in steel.
Conditions for the use of side-drilled holes as reference
reflectors in steel. For other materials, the values must
be converted accordingly.