The Model 1140A provides four calibration functions: precise simulation of thermocouple signals, precise measurement of thermocouple signals, generation of accurate dc voltages from microvolt level to ±11 volts, and measurement of dc voltages over the same range. The thermocouple simulation and measurement accuracies are the highest in the industry, affording a margin of calibration accuracy heretofore unavailable.

Using a high-speed microcontroller, the 1140A offers such unique features as an autozero function to correct the zero reading of a non-ideal thermocouple. For repetitive operations, 100 sets of operating conditions can be committed to memory for future retrieval, including automatic sequencing from one condition to the next. Using one of the several interfaces, all functions can be programmed and executed under computer control.

With an output impedance of less than 0.05 Ω on all ranges, high accuracy is maintained with an absolute minimum of loading error.

ALIGNMENT AND CALIBRATION
Calibration of the 1140A is a simple procedure that can be completed with a minimum of test equipment. In fact the majority of the instrument’s alignment can be accomplished with only a short across the front-panel terminals.

Alignment is performed by the instrument’s firmware and the user is guided by front panel instructions. There are no potentiometers or other internal controls to adjust. A switch inside the unit enables the alignment function.

Alignment is carried out in several steps, allowing alignment of all functions or a subset to be performed separately. Full alignment calibration requires a known 10 V reference, a null meter with microvolt resolution, and a shorting jumper. These accessories are available from Ectron Corporation.

FEATURES

• 0.06°C Accuracy for Common Thermocouple Types, including cold junction compensation (not including temperature extremes)
• Simulate and Measure Thermocouples
• Source and Measure dc Microvolts to Volts, nV Resolution
• Dc Accuracy of 0.0025% + 2.0 µV for Six Months, for both source and measure modes
• Output Impedance of 0.05 Ω, All Ranges
• USB Remote Interface Included

Thermocouple Accuracy- Source and Measure

Includes accuracy, conformity, cold-junction compensation, noise, stability, and temperature ( ±3° of T_cal )

Does not include errors in external thermocouple wire

OPTIONS AND ACCESSORIES

• IEEE-488-2, Ethernet, and RS-232 interfaces
• Rechargeable battery
• Rack mounting
• 1120 emulation mode
• Carrying case
• Calibration test kit