Check-line TI-CMX User Manual page 23

3. Press the LEFT and RIGHT arrow keys to toggle DIGITS or B-SCAN. When the
correct view is being displayed continue on to setting the B-START or B-DEPTH
values, or press the MEAS key to return to the measurement screen and begin taking
readings.
7.3 Adjusting the B-Scan Start (B-START) & Depth (B-DEPTH)
In order to use the B-Scan and Scan Bar features of the TI-CMX effectively, the starting
depth and overall depth must be setup correctly. This can be adjusted using the B-START
and the B-DEPTH features of the TI-CMX. The B-START refers to the starting depth or
thickness value displayed. Example: If you want your B-Scan or Scan Bar to start at a zero
thickness value, then B-START must be set to 0.000". If you want the B-Scan and Scan
Bar to start displaying at .125", then B-START must be set to .125". B-DEPTH represents
overall viewable thickness range being tested. Example: If your measuring tank walls with
a total thickness of .300", and your B-START has been set to 0.000", you might consider
setting your B-DEPTH value to something like 0.400" to cover the entire thickness range
being tested. You might also consider B-DEPTH as a zoom feature for both the B-Scan and
Scan Bar. Why? Because the larger the overall thickness range view (B-DEPTH), the
smaller the noticeable shifts in the Scan Bar and B-Scan presentation. Therefore, it's best to
set the B-START and B-DEPTH to reasonable values that zoom in and optimize your
graphic presentation.
Starting depth (B-START)
The starting B-START, or starting depth, is the starting thickness value. Often times this
value will simply be set to zero in order to start measuring at 0.000". The only time this
value will be set to something other than zero, is if the user needs to zoom in even closer.
When will this be the case? If the user is testing a material that's 1 inch in thickness and
knows that the potential corrosion is only on the back surface of the material and not possi-
bly deeper than .200". In this case, the user may wish to set the B-ST at .700" to zoom in
closer to the actual area being tested. In turn, the B-DEP might be set at 1.100" in order to
cover the entire range respectively. This will offer the user better resolution for both the B-
Scan and Scan Bar graphical presentations.
NOTE: Once the range is set, it will remain the same for all the views respectively.
The procedures to adjust the starting depth (B-START) are outlined below:
Adjusting the Starting Depth (B-START)
1. Press the MENU key once to activate the menu items tab. Press
the MENU key multiple times to tab right, and the ESC key
multiple times to tab left, until the DISP menu is highlighted
and displaying the submenu items.
2. Use the UP and DOWN arrow keys to scroll through the
sub menu items until B-START is highlighted.
3. Press the LEFT and RIGHT arrow keys to scroll the value.
When the correct B-Start value is being displayed, proceed
to step 8.
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Acoustic Velocity Table
Material sound velocity
in/us
Aluminum 0.2510
Beryllium 0.5080
Brass 0.1730
Bronze 0.1390
Cadmium 0.1090
Columbium 0.1940
Copper 0.1830
Glass (plate) 0.2270
Glycerine 0.0760
Gold 0.1280
Inconel 0.2290
Iron 0.2320
Cast Iron 0.1800
Lead 0.0850
Magnesium 0.2300
Mercury 0.0570
Molybdenum 0.2460
Monel 0.2110
Nickel 0.2220
Nylon 0.1060
Platinum 0.1560
Plexiglas 0.1060
Polystyrene 0.0920
PVC 0.0940
Quartz glass 0.2260
Rubber vulcanized 0.0910
Silver 0.1420
Steel (1020) 0.2320
Steel (4340) 0.2330
Steel Stainless" 0.2230
Teflon 0.0540
Tin 0.1310
Titanium 0.2400
Tungsten 0.2040
Uranium 0.1330
Water 0.0580
Zinc 0.1660
Zirconium 0.1830
-23-
sound velocity
m/s
6375
12903
4394
3531
2769
4928
4648
5766
1930
3251
5817
5893
(approx) 4572
2159
5842
1448
6248
5359
5639
(approx) 2692
3962
2692
2337
2388
5740
2311
3607
5893
5918
5664
1372
3327
6096
5182
3378
1473
4216
4648