User Manual

Extech Instruments
74 TKG250- EN V2.4 11/13
9 Software Options
Echo-to-Echo
The Echo-to-Echo feature should and can be used within the thickness range of the chart
listed below. It is best to use the transducers designated with a –EE part number such as
DK 537EE and DK 718EE. These transducers have greater damping allowing more
stable readings in Echo-to-Echo mode. To calibrate in Echo-to-Echo, first press MENU
OK, scroll to set up, press MENU OK and find where E to E is displayed. Either use the
right arrow to turn on or press MENU OK and scroll to on. You will see a symbol in the
top right looking like Echo-to-Echo. Next, press MENU OK, turn on calibration and
perform CAL VEL on the thick part with the coating and CAL ZERO on the think part
with coating, then MENU OK.
B-Scan
The B-Scan represents a cross sectional view on the test piece. The simplest example is to
show a 5 step test block. To turn on the option B-Scan, press MENU/OK, go to
Measurement, find B-scan and press MENU/OK. First enter the maximum thickness
you expect to scan using the up, down, left and right keys, then turn on the B-Scan
scrolling down and right arrow (left arrow for off). Press F3 in lefty or F1 in Righty mode
when done. The bottom of the display will read SAVE, START or STOP and CLEAR.
To Start a B-Scan, couple to the test block and press F2 [START]. If you uncouple the
transducer, B-Scan will stop due to LOS. If you press F2 [STOP] the minimum thickness
will be displayed in the center of the screen while a vertical cursor allows you to review
readings. During review the thickness value is updated in the top right of the display. To
save all the readings, press F1 [SAVE]. The amount of saved