Portable test meter with backlight battery depletion monitoring
US10782352B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2018 |
| Grant date | Sep 22, 2020 |
| Priority date | — |
| Expiry date | Apr 17, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3646
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A test meter and related method for monitoring the condition of a backlight battery of the meter in which the meter includes a housing, controller, display with backlight and a battery monitoring circuit. An off-time of the meter is measured and compared to a predetermined recovery time of the backlight battery. If the off-time of the meter is greater than the predetermined recovery time of the backlight battery, a voltage of the backlight battery is measured at a predetermined time after energizing the backlight and compared to a first predetermined voltage in excess of a threshold voltage of the backlight battery. If the measured voltage is less than the first predetermined voltage, the measured voltage is compared to a second predetermined voltage between the first predetermined voltage and the threshold voltage. A battery depletion warning is displayed if the measured voltage is less than the second predetermined voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.