Low charge detector
First Claim
1. A low charge detector suitable for use in a measuring instrument comprising a meter having a moveable measuring indicator associated therewith and a rechargeable means for supplying power to the instrument, said detector comprising means for causing said indicator to execute oscillations of a first amplitude when said rechargeable means reaches a first predetermined level of exhaustion and means for causing the indicator to execute oscillations of a second amplitude when said rechargeable means reaches a second predetermined level of exhaustion.
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Accused Products
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.
16 Citations
6 Claims
- 1. A low charge detector suitable for use in a measuring instrument comprising a meter having a moveable measuring indicator associated therewith and a rechargeable means for supplying power to the instrument, said detector comprising means for causing said indicator to execute oscillations of a first amplitude when said rechargeable means reaches a first predetermined level of exhaustion and means for causing the indicator to execute oscillations of a second amplitude when said rechargeable means reaches a second predetermined level of exhaustion.
Specification