Showa 5683, Operation Manual

Page: 41 / 68

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4.2.3 Measurement with Transducer
In most strain-gauge-based transducers, the physical amount to be measured is applied to an
elastic part, and the resulting deformation is converted into an electrical amount.
This elastic part is called the sensing part. The sensing part is made of material which exhibits a
higher limit of proportionality and less creep and hysteresis. A strain gauge is cemented on the
sensing part, connected so as to form a bridge, temperature-compensated and anti-humidity. For
details on various types of transducers, refer to the technical manuals provided by manufacturers.
(1) Connection of transducer to the amplifier unit
When using various types of transducers with the amplifier unit, make connections as shown in
Fig. 4-3. Fig 4-4 shows cables that are used for directly connecting various types of transducers
to the amplifier unit. NEC San-ei’s interconnecting cables and extension cables are manufactured
in accordance with the specifications for input connectors of strain gauges specified by the
Japanese Society of Non-destructive Inspection.
Fig.4-3 Connection of transducer to the amplifier unit
Fig.4-4 Connecting Cable
(2) Operating precautions on use of transducers
a. Unstable and loose attachment of a transducer may cause malfunctioning of the amplifier unit
or noise. Transducers should be securely fixed after referring to manufacturer’s operation
manuals.
b. Although transducers and their connectors are generally moisture-proof, they should be placed
to avoid water and rain so that insulation can be maintained.
c. Even though the cable from the amplifier unit to the transducer is long, precision
measurements can be taken because of the cable length correction feature. (Refer to page
3-6.)
d. A transducer to be used must be a type on which the common (E) terminal of the amplifier unit
will not be connected to another terminal (A, B, C or D).
e. Do not place transducers and their interconnecting cables where they will be exposed to strong
electric and/or magnetic fields
B
C
E
D
A
B
C
D
A
Extension Cable: 47231
Bridge Power
Bridge Output
Output
Input
Junction Cable: 47230