Low charge detector

Details Low charge detector Low charge detector

1983-07-05

1985-08-13

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

324 76R, 324155, 324435, 324436, 340691, 340657, G08B 2100

Patent

active

045353255

ABSTRACT:
A low charge detector, for a measuring instrument incorporating a meter for indicating measurement readings, includes a "low battery detector" circuit which causes a first output to be released from a 1 Hz oscillator, when a battery pack supplying power to the instrument discharges to a predetermined level. The first output is then applied to a pointer on the meter, thus causing the pointer to execute oscillations of a relatively small amplitude.
When the battery pack is substantially dead, a "dead battery detector" circuit causes a second output to be released from the oscillator and to combine with the first output. The combined output is then applied to the pointer, thus causing the pointer to execute oscillations of a substantially greater amplitude, thereby indicating that recharging of the battery pack is required.

REFERENCES:
patent: 1922792 (1933-08-01), Cain
patent: 2827610 (1958-03-01), Hiser
patent: 3383580 (1968-05-01), Wallace, Jr.
patent: 3412328 (1968-11-01), Lowery
patent: 3412332 (1968-11-01), Parker et al.
patent: 3550105 (1970-12-01), De Cola et al.
patent: 3739264 (1973-06-01), Resh
patent: 3916400 (1975-10-01), Lewis
patent: 4338596 (1982-07-01), Huber et al.
patent: 4376265 (1983-03-01), Kinchi et al.

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