Abstract A reference junction compensator for a multi-thermocouple activated temperature measuring circuit is an electrically equivalent of an ice bath cold junction compensator. The compensator includes a reference resistor forming a major portion of a printed circuit board. The resistor is retained against an isothermal terminal panel that contains the input terminals of each one of a plurality of thermocouples. The printed circuit reference resistor is interspersed about each pair of terminals and extends along substantially all remaining portions of the board that is in contact with the panel whereby the change in temperature of the reference resistor is maintained at substantially the same value as the temperature of the isothermal terminal panel. The resultant integrated effect which is afforded by the resistor pattern of the resistance compensator provides an accurate, rapid means of neutralizing any adverse heating and/or cooling temperature effects on the input terminals of any one or more of the aforementioned thermocouples and their associated measuring circuit.
A resistance reference junction compensator for a multithermocouple activated temperature measuring circuit, comprising a non-conductive substrate and an isothermal panel, said isothermal panel having means therein to provide separate terminals for each of a plurality of thermocouples, said substrate and panel having flat areas that are substantially equal and mounted in surface-to-surface engagement with one another, said substrate having a temperature sensitive reference resistor formed on said flat contacting surface thereof, said resistor being distributed over substantially all of said surface of said substrate and interspersed about said terminals, whereby said resistor responds to temperature changes when the temperature of one or several of said terminals are altered by a change in ambient temperature.
Claim 2
Dependent Claim
114 words
A resistance reference junction compensator for a multithermocouple activated temperature measuring circuit, comprising a non-conductive substrate and an isothermal panel, said isothermal panel having means therein to provide separate terminals for each of a plurality of thermocouples, said substrate and panel having flat areas that are substantially equal and mounted in surface-to-surface engagement with one another, said substrate having a temperature sensitive reference resistor formed on said flat contacting surface thereof, said resistor being distributed over substantially all of said surface of said substrate and interspersed about said terminals, whereby said resistor responds to temperature changes when the temperature of one or several of said terminals are altered by a change in ambient temperature.
Claim 3
Dependent Claim
24 words
The resistance reference junction compensator as defined in claim 1 wherein said reference resistor is an etched material that is laminated to said substrate.
Claim 4
Dependent Claim
24 words
The resistant reference junction compensator as defined in claim 1 wherein said reference resistor is a material that has been added to said substrate.
Claim 5
Dependent Claim
16 words
The resistance reference junction compensator as defined in claim 1 wherein the resistor is a wire.
Claim 6
Dependent Claim
18 words
The resistor reference junction compensator as defined in claim 1 wherein the resistor is a thick film material.
Claim 7
Dependent Claim
27 words
The thermocouple reference terminal compensator as defined in claim 1 wherein the thermal response of the resistor has substantially the same thermal response as the isothermal panel.