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Voltage Resolution Limit
Select the desired resolution that will be displayed on the main operating screen: 0.1 µV, 1 µV,
10 µV, 100 µV, or 1 mV. When the operating screen is being changed, the maximum resolution is
displayed; but when the ENTER key is pressed, the selected resolution is displayed. Because of
some internal constraints, the resolution may be reduced. For example, if the MODE is set to
METER, the OUTPUT MODE is set to VOLTAGE, and UNIT OF MEASURE is set to VOLTS; the
maximum resolution will be 10 µV.
Temperature Scale
Select the temperature scale to be used: the International Scale of 1990 (ITS-90) or the
International Practical Temperature Scale of 1968, amended edition of 1975 (IPTS-68). Although
the ITS-90 supersedes the IPTS-68, Ectron offers both scales.
Output Menu
The OUTPUT MENU allows the user to select the wire material, which terminals are active, the
copper offset units, the copper voltage offset, whether autozero is enabled, and the autozero
temperature offset.
Wire Material
If the wire connections to the Model 1140A are copper, select COPPER; if thermocouple wire,
ALLOY.
Terminals
Select the appropriate input connectors depending on the wire being used. Both copper and alloy
can be connected to either input. However, when using alloy, the selected terminals are the only
terminals at which the temperature is being monitored for compensation.
OUTPUT MENU
MATERIAL: ALLOY
TERMINALS: BINDING POSTS
COPPER OFFSET UNITS: SYSTEM UNITS
COPPER VOLTAGE OFFSET: +0.0000 mV
AUTOZERO ENABLED: NO
AUTOZERO TEMP OFFSET: 0.00°C
Figure 4-5: Output Menu
Using the terminal other than the one selected will
cause erroneous readings when working with ther-
mocouple wires.
NOTE
4-11
Operation
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