Vehicle current drain tester with memory saver

Details Vehicle current drain tester with memory saver Vehicle current drain tester with memory saver

1996-02-02

1997-05-13

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340636, 340458, 324433, 320 48, G08B 2100

Patent

active

056296800

ABSTRACT:
A vehicle current drain tester tests nominal current drain through a vehicle electrical system while preserving on-board vehicle memory. The tester includes a measurement current loop, an offset circuit and a fail indicator. The current loop includes first and second tester terminals for connection to the electrical circuit, first and second voltage source terminals for connection to a voltage source and a current sensor. The current sensor generates a measurement signal in response to current flowing in the current loop. The offset circuit is coupled to the current sensor and applies an offset to the measurement signal which represents a selected drain current level in the vehicle. The offset circuit generates a fail output signal as a function of whether the measurement signal exceeds the offset. The fail indicator is coupled to the offset circuit and is responsive to the fail output signal.

REFERENCES:
patent: 3638108 (1972-01-01), Channing
patent: 4019112 (1977-04-01), Satoh
patent: 4109193 (1978-08-01), Schultheis
patent: 4816768 (1989-03-01), Champlin
patent: 5057814 (1991-10-01), Onan et al.
patent: 5254952 (1993-10-01), Salley et al.
patent: 5426416 (1995-06-01), Jefferies et al.
Mohammad Sami, "Complete Circuit," Automotive Rebuilder, Oct. 1993, pp. 59-61.

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