43-TV-25-30 Iss.6 GLO Aug 07 UK 287
Ext 0°C Reference
Ext 0°C Reference. By keeping the reference junction at 0 °C then the negative input is act-
ing as a 0 Volt reference so the voltage reading from the thermocouple can be passed di-
rectly to the tables where the corresponding temperature reading can be found.
Diagram shows passive burnout, for active burnout replace the + for *.
External with a Specified Temperature
External Reference with a specified temperature. The reference junction is kept at a con-
stant known temperature other than 0°C. This temperature can be specified in the setup
menus. This reference temperature is then used in the same way as the reading from the
temperature sensor using the
Internal Reference method.
Diagram shows passive burnout, for active burnout replace the + for *.
Temperature reading
to maths expression
V
-
+
(Volts)
Reference
junction held
at 0
C
0 Volts
0
C
Measuring
junction
Thermocouple
cable
Copper wire
Input
terminals
on rear
panel of
recorder
Look-up table
(converts volt-
age reading to
temperature)
Temperature
reading to
maths
expression
(Volts)
C
D
V
Reading in volts
-
+
Reference
junction held
at 45
C
0 Volts
45C
Measuring
junction
Thermocouple
cable
Copper wire
Input
terminals
on rear
panel of
recorder
Inputs
added
(C+D)
Look-up table
(converts
voltage read-
ing to tem-
perature)
Ref
temp
Thermocouple
Table
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