Richard A Lentz

US Patent:

44595484, Jul 10, 1984

Filed:

Nov 12, 1981

Appl. No.:

6/320329

Inventors:

Richard P. Lentz - Kenosha WI
Stephen B. Servais - Franksville WI

Assignee:

Snap-on Tools Corporation - Kenosha WI

International Classification:

G01R 3102

US Classification:

324158MG

Abstract:

An alternator produces current that has an average component and a ripple component. The alternator testing apparatus produces one voltage representative of the magnitude of the peak-to-peak amplitude of the ripple component and a second voltage representative of the sum of the average component and the peak-to-peak amplitude of the ripple component. A series of comparators each have their signal inputs coupled to receive the first voltage and their control inputs coupled to a divider network which is in turn coupled to receive the second voltage. Indicators are coupled to the comparators.

US Patent:

43696600, Jan 25, 1983

Filed:

Apr 13, 1981

Appl. No.:

6/253582

Inventors:

Richard P. Lentz - Kenosha WI
Thomas J. Lasky - Kenosha WI
Stephen B. Servais - Franksville WI

Assignee:

Snap-On Tools Corporation - Kenosha WI

International Classification:

G01L 904

US Classification:

73753

Abstract:

There is disclosed a transducer to sense the vacuum in the intake manifold of an engine or other chamber. The electrical signal it produces is converted into digital signals for operating a liquid crystal display. The output of the transducer is also coupled to a driver which is operable in one mode to produce energizing currents on all of its outputs corresponding to the amplitude of the electrical signal. The driver is coupled to LEDs which are thus illuminated. The driver is also operated in a second mode so that only one of the outputs is energized and in that mode the driver receives only the AC component of the transducer output.