Accession Number : ADD012276

Title :   Multiple Thermocouple Testing Device.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Hildebrand,James R ; Sobanski,Kurt J

Report Date : 18 Feb 1986

Pagination or Media Count : 11

Abstract : An automated multiple thermocouple testing device determines short and open circuits in a thermocouple system. The thermocouple system that has a plurality of temperature probes, each probe has a first thermocouple. The device applies a direct current voltage to the first thermcouple to cause heating in the second thermocouple and a second thermocouple and then reads the temperature response of the second thermocouple. The first thermocouples have a common lead and the second thermocouples are connected in two parallel groups. The temperature output of the second thermocouple is digitized and read by a computer. These readings are compared to critieria which determines if there is an open circuit. Before the open circuit test is applied, the device also determines which thermocouple probe has a possible short circuit. This device can automatically test for short and open circuits in a thermocouple system within a few minutes without the necessity of removing the probes from their installed position. This device was adapted to preform the above testing on a F100 fan turbine inlet temperature (FTIT) system.

Descriptors :   *PATENTS, *CIRCUIT TESTERS, *THERMOCOUPLES, *PROBES, *SHORT CIRCUITS, DUAL MODE, ANALOG TO DIGITAL CONVERTERS, TURBOFAN ENGINES, PARALLEL ORIENTATION, JET FIGHTERS, RESPONSE, MULTIMODE, TEMPERATURE, DISPLAY SYSTEMS, DIGITAL COMPUTERS, OUTPUT, INDICATOR LIGHTS, CIRCUITS, CONVERTERS, INLETS, INVENTIONS

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE