Abstract

To improve the precision of the test device for some airborne thermometer system, the hardware structure and the software flowchart of auto-test instrument for airborne temperature indicator were introduced. The 89C52 single-chip computer is used in the test instrument. The CPU、A/D、 D/A and I/O boards are assembled as a cascade structure. By using the technologies of the advanced chip and Lab Windows / CVI 5.0, the instrument’s precision and flexibility are greatly enhanced. The test results show that the test resolution is 23Bit, the output electric current is 10mA, the precision is ±0.01mV.

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