Omega RD2800 Series User Manual page 109

18. ADJUSTMENT
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
-
+
DC standard voltage
generator
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
(+)
( - )
-
+
DC standard voltage
generator
18.1 Adjustment of Measured Values
Copper lead wire
Reference junction
compensator
1 2 3 4
Input terminals
－１０５－
(+)
Thermocouple wire *
( - )
Test tube
Silicon oil
Ice + distilled water
Vacuum bottle
(3) Resistance thermometer input
(A)
(B)
(B)
Standard variable
resistor
1 2 3 4
Input terminals
1 2 3 4
Input terminals