Mode 3 Echo Blank; Figure 10-15 Examples Of The Interface Blank In Mode 3; Figure 10-16 Examples Of M3 Blank Adjustment - Olympus 45MG User Manual

DMTA-10022-01EN, Rev. C, January 2015

Figure 10-15 Examples of the interface blank in mode 3

10.8.3

Mode 3 Echo Blank

The echo blank in mode 3 (M3 BLANK) is similar to the interface blank in mode 2, or
to the main bang blank in mode 1. This function creates a blank or dead zone up to
20 µs long following the leading edge of the first detected back-wall echo in order to
prevent detection of trailing lobes or cycles of that echo, and the resulting gage hang-
up (see Figure 10-16 on page 182).
Gage hanging up on trailing edge of back wall 1
182 Chapter 10
Gage reading between back-
wall echoes 1 and 2

Figure 10-16 Examples of M3 Blank adjustment

Interface blank adjusted so the gage measures
between back-wall echoes 2 and 3
M3 BLANK set properly