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Operation
Instrument Mode Menu
Instrument Mode
Select SOURCE for the Model 1140A to act as a source; that is, to provide a simulated
temperature out or provide a linear voltage output. Select METER for the Model 1140A to act as a
meter to measure either linear voltage or the voltage input of a thermocouple.
Output Mode
Select TEMPERATURE or VOLTAGE.
System Temperature Units
When working with thermocouples, select the units of temperature to use: CELSIUS,
FAHRENHEIT, RANKINE, or KELVIN.
System Voltage Units
When working with linear dc voltage, select the appropriate voltage units: VOLTS or MILLIVOLTS.
Temperature Resolution Limit
When in the SOURCE mode, select the desired resolution that will be displayed on the main
operating screen: 0.01°, 0.1°, or 1° (0.01, 0.1, or 1 when the system temperature units are kelvins).
The choices are the same in the METER mode except that 0.1° (0.1 kelvins) is the maximum
resolution. When the operating screen is being changed with the ENCODER or ARROW KEYS, the
maximum resolution is displayed; but when ENTER is pressed, the selected resolution is
displayed.
INSTRUMENT MODE MENU
INSTRUMENT MODE: SOURCE
OUTPUT MODE: TEMPERATURE
SYSTEM TEMPERATURE UNITS: FAHRENHEIT
SYSTEM VOLTAGE UNITS: MILLIVOLTS
TEMPERATURE RESOLUTION LIMIT: 0.01°
VOLTAGE RESOLUTION LIMIT: 0.1 µV
TEMPERATURE SCALE: ITS-90
Figure 4-4: Instrument Mode Menu
Although the MILLIVOLTS unit of measure provides
more resolution for the user than VOLTS, there is no
difference in accuracy between settings that are
equal in value. For example 0.01 V is the same
internally as 10.0 mV, and 10.0 V is the same as
10000.00 mV.
NOTE
4-10
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