dacell AM-1000 Panduan Pengguna - Halaman 14

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4-3. High Level Voltage input

This device can measure the signal that inputted in DC (DCDT, High level,

Thermocouple etc).

For the measurement, following conditions should be satisfied.

On Common mode, the amp input should be as ± 10V. Please be careful since

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when over ± 10V is inputted, the signal source will be cut off.

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When Thermocouple temperature sensor is used, an error in measurement can

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

current is originated by this input impedance, it should be over 50mA to carry out

the measurement.

The each space for selecting sensor cable should be:

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electrically isolated.

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Cable resistance should be small.

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The cable resistance of the internal lines should be regular.

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It is better to use the shield cable.

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,

please make the lead cable as shortest as possible.)