SDT Sherlog Kit Master SDT270, Technical And User'S Instruction Manual

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File name: MAN.MAS.EN‐‐02X‐‐Sherlog‐Master‐user‐manual‐Eng.docx
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14 The multi‐transmitter operational
problems
14.1 Ultrasonic transducer
Decreasing ultrasonic signal
The main reason, when an unstable signal is
read/displayed on the SDT270 receiver, is that the
battery is not fully charged. The discharge curve of the
battery is constant over a long period. Any variation in
power will immediate stop the transmitter in order to
prevent incorrect measurements.
Low but constant level ultrasonic signal
If the signal measured from a transducer during the function test (when the Amplification level is set at 10 and the
transmitter selector switch position in position 1) is significantly lower than 95 dBµV and however remains constant,
this indicates that the functioning of the transducer is impaired by some clogging/damage . In this case, clean the
transducer(s) or protective grid . Do not used compressed air to clean/blow out any impurities.
Defective transducers
Transducers may become damaged due to:
•
A mechanical shock/impact: return the equipment to your distributor in order to change one or more transducers
as necessary.
•
Water in the transducers: leave to dry and check that there is no water left, etc.
•
Dust, debris and grease: try to clean gently, do not used compressed air to clean/blow out any impurities.
Above damages/problems will reduce the transmission power significantly which may result in incorrect
measurements so that corrective action is required.
Note: The failure of one or two transducers will not prevent you from carrying out a correct tightness test. The
remaining total output will still be sufficient in most cases.
14.2 Control fuse
If, despite an apparently correctly charged battery, the
transmitter (whilst in good working order), does not
produce any ultrasonic signal, a chemical control fuse
located in the internal electronics as well as in the battery
support unit may have been triggered.
Contrary to a standard type fuse, such a fuse contains a
progressive reset time corresponding to the following
curve. In this case, wait 1 to 5 minutes and try again.
Never replace the chemical fuse with a different type. Successive occurrences of triggering are caused by a
failure in the equipment. It is therefore advisable to return the equipment to the distributor for repairs.
Curve illustrating a decreasing ultrasonic signal.
Automatic reset curve of the chemical fuse.