Ectron 1140A - Section V, Applications; Instrument Modes: Source and Meter

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SECTION V

5 APPLICATIONS

GENERAL

The Model 1140A is a high-accuracy thermocouple simulator-calibrator incorporating the latest

circuit design, a fast microcontroller, intuitive and user-friendly software, and many new

functions. Because this instrument offers a new level of accuracy and resolution, new applica-

tions are available not possible with lesser simulators. Some of these are outlined in this section.

FUNCTIONS

The following instrument modes are available selected either by front panel or by remote control:

Source Mode

With the output mode set to TEMPERATURE, the Model 1140A becomes a precision thermo-

couple simulator with six digits of display and resolution to 0.01 degrees.

Because of this

display resolution, even high-temperature signals can have high resolution. For electrically noisy

environments, the resolution can be reduced.

For example it is possible to set a Type J thermocouple to 1155.55°C. The 6-month accuracy at

this setting is ±0.07°C.

When sourcing thermocouple voltages (without cold-junction compensation) the resolution is

0.1 µV with six digits of display. An example of its display and resolution capabilities could be

simulating a Type J thermocouple at 1150°C and a display of 66,679.2 µV.

In the linear mode (output mode set to VOLTAGE), it is a precision 0.002% dc source (30-day

specification) with 7 digits of display and resolution to 0.1 µV. For example, this allows a plus or

minus 9.876543 V signal to be generated with a resolution of 1.0 µV.

Meter Mode

With the output mode set to TEMPERATURE, the Model 1140A is a precision thermocouple-

measuring meter (auto-ranging digital thermometer) with resolution to 0.01 degrees

and six

digits of display.

In the linear mode (output mode set to VOLTAGE), it is a precision dc-measuring meter (auto-

ranging digital voltmeter) with seven digits of display and resolution to 0.1 µV.

1 In any of the temperature modes of operation, resolution is automatically reduced to 0.1°C when the Seebeck

coefficient (change in emf per degree) is less than 10 µV/°C.

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