Epson USN 52R Operating Manual page 58

Adjustment of the USN 52 R
MTL VEL Sound velocity
In MTL VEL you set the value for the sound velocity in
the material under test. You can change between preset
fixed values or continuously adjust the value.
Operation:
– Set the sound velocity in MTL VEL with M, e.g.
5920 m/s (longitudinal wave velocity in steel).
H Note:
The default value for the sound velocity can be
changed in the second operating level (functions VE-
LOCITY # 1 and VELOCITY # 2) if you frequently oper-
ate with other materials (refer to Chapter 5.6).
Adjustment of the freely selected value:
– Simultaneously press NO in MTL VEL.
– Change the setting with M.
With free adjustment of the value, the function name
appears in small letters (mtl vel). In this way you are
able to recognize which mode of adjustment you have
selected.
Krautkramer USN 52R/USN 52L
Attention:
Always make sure that the sound velocity in MTL VEL
is set correctly! The instrument calculates all interval
and distance indications using the values which have
been set here.
ZERO Probe delay
Each probe has a delay block (protective layer, delay
wedge with angle-beam probes) between the element
and the coupling surface. The initial pulse must be
transmitted through this delay block before the sound
can enter the test object. The ZERO function allows
you to take into account the loss of time caused by the
delay block in order to achieve the correct measure-
ment of all sound paths in the test object.
Operation:
Set the value for the probe delay in ZERO using M.
H Note:
If the value for ZERO is not known, read Chapter 5.3
beforehand in order to determine this value.
Issue 05, 02/00
Operation
5-13