Omega RD200, RD2800 manual Checking Method, Standard variable Resistor Resistance thermometer input

21. MAINTENANCE

21.3 Measured Values Check

3

Connections

Connections depend upon the input types. Connect both standard and other tools to the measuring input terminals to be adjusted.

Caution Turn off the power source before starting connections

In order to prevent electric shock, turn off the power source before starting connections.

(1) In case of thermocouple input				*Thermocouple of the same		1	2 3	4
				type as the input type
						(+)
			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

Standard variable

resistor

(3)Resistance thermometer input

12 3 4

(A)

	(B)
	(B)
Standard variable
resistor	Input terminals

4

Checking Method

Input the printing range (T) of 0%, 50% and 100% from a		Error computation
	e (%) =		M – T	X 100
standard tool and obtain an error (e) by reading the
measured values (M).			T

－１２２－