Operation
Thermocouple Type
Select a THERMOCOUPLE TYPE from those listed in Table 4-1.
Thermocouple Offset
If there are known inaccuracies in the instrumentation being used (for example, in the
thermocouple wire), the offset will compensate for that error.
Thermocouple Offset Units
Select CELSIUS (°C), FAHRENHEIT (°F), RANKINE (°R), KELVIN (K), or SYSTEM UNITS, which are
those units set under the INSTRUMENT MODE MENU.
Thermocouple Offset
It is advisable to select the thermocouple-offset units before entering this value because the
Model 1140A converts the temperature offset to match the units. For example, if the user sets the
OFFSET to 1.0 when the UNITS are set to CELSIUS and then changes the units to FAHRENHEIT, the
thermocouple offset displayed will convert automatically from 1.0°C to +1.8°F, which of course is
the equivalent offset. The limits are −5°C to +5°C (−9°F to +9°F, −5 K to +5 K, and −9°R to
+9°R). Each thermocouple type has its own offset.
Reference-junction Temperature
Although in most instances a reference-junction temperature of 0°C is desired, the operator can
enter any reference-junction temperature with the temperature range of the thermocouple module
in use.
Reference-junction-temperature Units
Select CELSIUS (°C), FAHRENHEIT (°F), RANKINE (°R), KELVIN (K), or SYSTEM UNITS, which are
those units set under the INSTRUMENT MODE MENU.
Reference-junction Temperature
Select any valid temperature within the range of the thermocouple type to be used. See Table 4-1.
Note that when the reference-junction-temperature units are changed, the setting of the
reference-junction temperature will change accordingly. For example, if the user selects 0.0 as
the reference-junction temperature when the units are set to CELSIUS and then changes the units
to FAHRENHEIT, the reference-junction temperature will convert automatically from 0.0°C to
+32.0°F, which of course is the equivalent.
4-9
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