Rockwell-automation 1771-IXE Thermo/MV Input Installation Instructions Manual do Utilizador descarregar pdf (Página 14)

Thermocouple/Millivolt Input Module14

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     

Source resistance causes similar errors to occur with millivolt inputs.

If source resistance is less than 100 ohms, no compensation is

necessary to maintain stated accuracy. If source resistance is greater

than 100 ohms, the error can be calculated as follows:

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(

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

(

  &!$(



Where R

= source resistance (one–way cable resistance)

= applied input voltage

When using thermocouples, Vin is the approximate thermocouple

voltage of the temperature of interest.

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









$ &!$(

&











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To maintain a display error of < 5uV at V

= OV, R

should be <

341 ohms. Refer to NBS NM–125 Thermocouple Reference Tables

for determining actual thermocouple voltage versus temperature

readings.

The analog input module has hardware–based high frequency filters

on all channels to reduce the effect of electrical noise on the input

signal. These are 6–pole filters, which begin rolling off at 8.0Hz.

This filtering is in addition to the software-based digital filtering

selected in the module’s BTW configuration.

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