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Instruction Manual
Gating System Type 4440
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Tugger
SeJector
033-0
107
Glllmg SYSIt'I1l
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4440
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,..-- - -
Measurmg
Gate- -
-
- -
Delay
An instrument that allows transducers to be
calibrated accurately even in the presence
of
reflections,
the
4440
cuts
out
the
echoes caused by the boundaries of the en
-
closure so that free-field conditions are arti
-
ficially achieved
.
The input continuous sine
signa
l
is gated to obtain a driving tone
burst
.
The detector is gated and delayed to
match the distance between the transmitter
and the receiver, and the peak level is de
-
tected
.
The gate width (pulse length). tone
-
burst repetition frequency, and delay be-
tween the output signal and the measuring
gate can all be adjusted to suit individual re
-
quirements
.
Apart from transducer calibra-
tions, many other applications are possible
:
for example, generation of accurately-timed
pulses and transients for echo investiga
-
tions
,
absorption measurements
,
and medi
-
cal and biological research measurements
.
~
BrLiel
&
Kjrer
~
_
_
.
.
_
_
_ _ ._
_
_
-.J
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