Checkline TI-44N - Manual (Page 9)

6.1 Acoustic Velocity Selection Table
ACOUSTIC VELOCITY SELECTION TABLE
Material Acoustic Equivalent Equivalent
Type Velocity Value Value Of
(meters/sec) Of Calibration Calibration Disc
Disc (Inch) Disc (mm)
Aluminum 6260 .208 5.3
Acrylic (Plexiglass) 2700 .090 2.3
Cast Iron 4400-5000 .148 - .168 3.8 - 4.3
Ceramics 10000 .332 8.4
Copper 4700 .156 3.9
Duralumin (17S) 6320 .211 5.3
Ebonite 2500 .083 2.1
Glass 5570 .185 4.7
Nickel 6040 .201 5.1
Polyethylene (Soft) 1900 .063 1.6
Polyvinyl Chloride (PVC) 2300-2500 .077-.083 1.9 - 2.1
Quartz (X cut) 5720 .191 4.9
Stainless Steel (SUS304) 5790 .193 4.9
Stainless Steel (SUS403) 6100 .205 5.2
Stainless Steel (SUS410) 7390 .246 6.2
Steel 5930 .197 5.0
Tin 3320 .110 2.8
Zinc (Zn) 4170 .139 3.5
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆ Denotes one of the 10 preset values in Mode C.
TI-44N Operating Instruction Guide
9
6.5 Changing Modes
Flow of mode selection:
S to B1 measurement method
Standard Thickness value
Measurement Ex.: 5.00 mm
F/ H appears on the extreme
right in Free / Hold mode,
respectively.
Aluminum Thickness value followed by A
Measurement Ex.: 5.00 mm_A
F/H appears on the extreme
right in Free/Hold mode,
respectively.
TI-44N provides two measurement modes depending
upon the nature of the test material (Standard and
Aluminum mode), which can be easily switched by
MODE switch operation:
Pressing and holding the MODE switch for longer than two seconds always
toggles back and forth between the Free and Hold modes.
Free mode is the correct choice for almost all applications. Select the Hold
mode when readings fluxuate and stable measurement cannot be obtaned.
TI-44N Operating Instruction Guide
12