Resistance measurement in an active and high temperature environment
First Claim
Patent Images
1. A method for measuring the resistance of a part of a powered soldering iron, comprising:
- providing an a.c. signal;
passing the a.c. signal through said part of the soldering iron to modify said a.c. signal;
transmitting the modified a.c. signal through a full-wave rectifier to obtain a full-wave rectified signal; and
averaging the full-wave rectified signal over time to generate a direct current signal having an amplitude which is proportional to the resistance of said part of the soldering iron.
2 Assignments
0 Petitions
Accused Products
Abstract
A circuit and method for measuring resistance in an active and high temperature environment is provided using a low frequency square wave as an input. The square wave input is fed through the unit under test into a full-wave rectifier and RMS circuit. The full-wave rectifier and averaging circuit cancel out errors caused by the Seebeck effect and noise. The resulting d.c. signal is proportional to the resistance of the unit under test and can be displayed.
-
Citations
21 Claims
-
1. A method for measuring the resistance of a part of a powered soldering iron, comprising:
-
providing an a.c. signal; passing the a.c. signal through said part of the soldering iron to modify said a.c. signal; transmitting the modified a.c. signal through a full-wave rectifier to obtain a full-wave rectified signal; and averaging the full-wave rectified signal over time to generate a direct current signal having an amplitude which is proportional to the resistance of said part of the soldering iron. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for measuring the resistance of an energized and hot soldering tip, comprising:
-
providing a square wave signal; passing the square wave signal through said soldering tip to modify said square wave signal; transmitting the modified square wave signal through a full-wave rectifier to obtain a full-wave rectified signal; and averaging the full-wave rectified signal over time to generate a d.c. signal having an amplitude which is proportional to resistance of said soldering tip.
-
-
13. A device for measuring the resistance of a part of a powered soldering iron environment, comprising:
-
a generating circuit for generating an a.c. signal, said generating circuit being coupled to said part of the soldering iron for passing said a.c. signal therethrough; a full-wave rectifier for full-wave rectifying a modified a.c. signal, said full-wave rectifier being coupled to said part of the soldering iron; and an averaging circuit for averaging a full-wave rectified signal over time and generating a direct voltage signal having an amplitude which is proportional to the resistance of said part of the soldering iron, said averaging circuit being coupled to said full-wave rectifier. - View Dependent Claims (14, 15, 16, 17, 19, 20, 21)
-
-
18. The device 13, wherein said conductor is an energized and hot soldering tip.
Specification