Portable impedance meter for resistance welding equipment
First Claim
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1. An impedance meter for closely approximating the impedance of a resistance welding apparatus between first and second points thereon, said meter comprising:
- current supply means for supplying an alternating current of a preselected amperage;
conductor means for conducting the current from said current supply means to the first and second points of the resistance welding apparatus;
voltage meter means for measuring the voltage across the first and second points of the welding apparatus when the current is conducted therethrough; and
display means for displaying a number dependent on the measured voltage, said number being indicative of the impedance of said welding apparatus.
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Abstract
A portable meter for measuring the impedance of a resistance welding circuit between first and second points on the apparatus. The meter is powered by conventional alternating current and conducts a test alternating current through the welding apparatus at such an amperage so that the voltage measured between the first and second points is equal to the impedance therebetween.
37 Citations
16 Claims
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1. An impedance meter for closely approximating the impedance of a resistance welding apparatus between first and second points thereon, said meter comprising:
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current supply means for supplying an alternating current of a preselected amperage; conductor means for conducting the current from said current supply means to the first and second points of the resistance welding apparatus; voltage meter means for measuring the voltage across the first and second points of the welding apparatus when the current is conducted therethrough; and display means for displaying a number dependent on the measured voltage, said number being indicative of the impedance of said welding apparatus. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A portable impedance meter for use with resistance welding apparatus comprising:
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a case; a power cord extending from said case to be connected to a source of conventional alternating current; a pair of current leads extending from said case to be connected to a pair of points on a resistance welding apparatus between which an impedance is to be measured; a pair of voltage leads extending from said case to be connected to the pair of points on the resistance welding apparatus; current meter means for displaying the amount of current supplied to said current leads; control means for controlling the level of current supplied to said current leads to a selected level as read on said current meter means; and voltage meter means connected to said voltage leads for displaying the voltage thereacross, thereby providing an indication of the impedance of the resistance welding apparatus between the points. - View Dependent Claims (8, 9, 10, 11)
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12. A method of determining the impedance of a resistance welding device between first and second points, said method comprising:
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electrically connecting conductor means, for conducting current, to the first and second points; conducting an alternating current of a preselected level through the conductor means and thereby through the device between the first and second points; measuring the voltage across the first and second points while the current of a preselected level is flowing therethrough; and displaying a result dependent on the measured voltage and indicative of the impedance between the first and second points. - View Dependent Claims (13, 14)
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15. A method of approximating the impedance of a resistance welding apparatus comprising:
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conducting current of a known amperage between first and second points of the welding apparatus, the known amperage being 10k where k equals any integer; and measuring the voltage across the first and second points while the current of known amperage is flowing therethrough, whereby the voltage closely approximates the impedance. - View Dependent Claims (16)
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Specification