Blanking Adjustments In Manual Echo-To-Echo Detection Mode - Olympus 45MG User Manual

2. In the MEAS screen, set the MEAS MODE to the desired echo detection mode:
STANDARD, AUTO E-TO-E (optional), or MANUAL E-TO-E (only available
with the Waveform option).
NOTE
When switching between standard and Echo-to-Echo modes, it may be necessary to
perform a second [CAL ZERO], because the zero offset is different for each
measurement mode. The 45MG can store two different zero calibrations, one for
standard mode, and the other for Echo-to-Echo mode.
3. To perform the zero calibration again:
a) Place a drop of couplant on the surface of the thin part of the test block.
b) Couple the transducer to the thin part of the test block, and then press
[CAL ZERO].
c) Once the thickness reading is stable, press [ENTER].
d) Using the arrow keys, edit the thickness value to match the known thickness
of the thin part of the test block.
6.2.1

Blanking Adjustments in Manual Echo-to-Echo Detection Mode

The 45MG offers two blanking functions to help detect valid echoes in situations
where material conditions generate unwanted signals:
EXT BLANK
The extended blank creates a blanked zone that begins at the left edge of the
waveform display, and in which no signals are detected. In situations where the
second or third pair of back-wall echoes are stronger or cleaner than the first pair,
use the extended blank to control which pair of echoes are used for measurement.
E1 BLANK
The echo 1 (E1) blank runs for a selected interval following the first detected echo.
Use the E1 blank to exclude any unwanted peaks occurring between the first and
second back-wall echoes. Unwanted peaks may be trailing edges of a large first
echo, or shear-wave reflections on thick test pieces. The E1 blank parameter is
only available in the manual Echo-to-Echo detection mode.
To adjust the extended and the E1 blank parameters
1. Select the manual Echo-to-Echo mode:
DMTA-10022-01EN, Rev. C, January 2015
Software Options 73