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When Thermocouple temperature sensor is used, an error in measurement can
2
be occurred since the temperature-electromotive force might be generated on
the commissure between the connector pin of amplifier and thermocouple lead
wire. Therefore, you should do the cold junction compensation or you should
carry out the measurement in the place where without such a big temperature
change.
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The input stage of amplifier are "+SIG", "-SIG". Since their minimum input
3
current is originated by this input impedance, it should be over 50nA to carry out
the measurement.
4-4. Notes for selecting sensor cable
The each space for selecting sensor cable should be:
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electrically isolated.
1
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Cable resistance should be small.
2
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The cable resistance of the internal lines should be regular.
3
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It is better to use the shield cable.
4
4-5. Notes for Dynamic measurement
Strain gauge or Transducer (located at the end of the measurement lead cable) is
exposed to various electric devices and equipment and also receive the analogue
frequency (50kHz, 60kHz) noise from the line power. Therefore, please carry out
the following procedures to minimize this kind of happening.
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Please prepare for the shield cable. (If the shield cable cannot be ready,
1
please make the lead cable as shortest as possible.)
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The shield cable should be connected to the ground and input connector.
2
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The cable resistance of the internal cables should be regular.
3
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It's better to use the shield cable.
4
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All wires should be built in the clean environment for the measurement.
5
(Please avoid using transformer, motors, relay and high voltage cable where
the magnetic field can be easily generated. If it is necessary to use one of
them, please use any structure for the protection.)
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