Tof Mode - GE USM 36 Series Technical Reference And Operating Manual

5 Operation

TOF MODE

The sound path measurement by means of the echo
evaluation depends on the choice of the measuring
point.
The following settings are possible:
● PEAK (peak measurement)
The amplitude and the time-of-flight are measured at
the absolutely highest amplitude value within the gate
with maximum resolution of the instrument.
● FLANK (flank measurement)
The amplitude is measured as in the case of PEAK,
however, the time-of-flight is measured at the first
point of intersection between the echo and the gate
with maximum resolution of the instrument.
● J-FLANK
The time-of-flight is measured as in the case of
FLANK, the amplitude measurement before the 1st
change of direction downwards if the gate threshold
is afterwards not reached yet another time. In the
case of larger values for the function RANGE, it may
happen that several points are combined into one. In
these cases, the evaluation no longer corresponds to
the displayed A-scan.
5-24
Setting the gates (function groups GATE A and GATE B)
● FIRST PEAK
The measurement is made as in the case of J-
FLANK, however, with screen resolution. If the eval-
uation using the displayed A-scan is of prime impor-
tance, FIRST PEAK should be preferred.
Issue 2 (12/2013) USM 36