18. ADJUSTMENT

18.1 Adjustment of Measured Values

3

Connections

Connections depend upon the input types. Connect the standard tools to the input terminals to be adjusted.

Caution Make sure to connect after turning off the power supply.

To prevent any injury caused by electric shock, be sure to turn off the power supply before connections.

(1) In case of thermocouple input

1

2 3

4

 

 

 

 

(+)

 

 

 

 

 

 

Copper lead wire

Thermocouple wire *

 

 

 

 

 

 

 

( - )

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Test tube

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input terminals

 

 

 

 

 

Silicon oil

 

 

 

 

 

 

 

 

+

-

 

 

Ice + distilled water

 

 

 

 

 

 

 

 

DC standard voltage

 

Vacuum bottle

 

 

 

generator

 

 

 

 

 

Reference junction

compensator

The electromotive force of the thermocouple input is reduced by an amount proportional to the temperature at the terminals. The recorder itself compensates (reference junction compensation) for this reduction. The adjustment is executed by inputs based on the reference electromotive force (0°C reference). In case the “RJ selection” is set to “1” (Enable) in the “Range/Printing range” programming, an amount equivalent to the reference junction compensation has to be subtracted using a reference junction compensator.

(2) DC voltage input

1 2 3 4

(+)

( - )

+

-

Input terminals

DC standard voltage

generator

(3)Resistance thermometer input

12 3 4

(A)

(B)

(B)

Standard variable

 

resistor

Input terminals

 

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Page 109
Image 109
Omega RD2800, RD200 manual DC voltage input, DC standard voltage Generator Resistance thermometer input