3. Setting Up the DMS 2
Page 62 DMS 2 Operating Manual
Step 6:
ZERO will be set to the choice last displayed.
Step 7:
Probe zeroing procedures are explained in Section
3.3.3.
Viewing the Test Material’s Velocity (TGMODE-VELOC)
Step 1:
Activate the TGMODE submenu (if it’s not already
activated) by selecting it with
or so that it’s high-
lighted. Five selections will appear across the bottom of the
display screen.
Step 2:
The instrument’s velocity reading can be viewed in
the selection box labeled VELOC. This is the speed of sound
in the material being tested. It’s determined by conducting
one of the thickness calibration procedures. (Refer to
Section 3.3.4.)
Step 3:
Approximate values for the speed of sound in various
materials can be found in Section 3.3.4. The velocity value
can be input directly from the information given in Table 3-1.
However, this is not recommended. A manually-input velocity
value will
not
be as accurate as a velocity determined by
calibrating the instrument to a known thickness. (Refer to the
note at the bottom of Table 3-1.)
3.3.2 ALARM Settings
Use the procedures described below to adjust the
instrument’s minimum and maximum thickness alarm values
and indications. These parameters allow you to indicate the
material thickness readings above which and below which
(MAX and MIN) the instrument will signal audible and visual
alarms. The thickness value at which an alarm will sound
changes from one test application to another, any time that
the acceptable material dimensions change. Note that once a
data file is saved, the MIN and MAX alarm values used when
that data was recorded will become effective whenever that
data file is reactivated.
The parameters also allow the user to specify the type of
signal (visual, audible, or both) the instrument will use as a
thickness alarm. The adjustments will require access to the
ALARM submenu. This is accessed from the TG Primary
Menu (Figure 3-4).
Setting the Minimum Thickness Alarm Level (ALARM-
MIN)
Step 1:
Activate the ALARM submenu (located in the TG
Primary Menu) by selecting it with
or so that it’s
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