Regal RH40, Руководство пользователя

Страница: 13 / 90

13
2. Flow Rate Measurement
§2.1 Built-in Battery
The RH40 flow meter can operate either from the built-in Ni-H rechargeable battery or from an external
AC power supply. The battery will last over 8 hours of continuous operation when fully charged. In
addition, the AC power supply allows the device to run while charging. The red LED will be on when the
battery is charging.
The battery-charging circuit employs both constant-current and constant-voltage charging methods.
The battery charges quickly at the beginning, and the current tapers off as the battery approaches full
power. In other words, the current becomes smaller and smaller throughout the charging process. As, a
result, there should be no problems with over-charging. This also means that the process of bringing the
device to full power can take up a significant amount of time. We recommend charging the device
overnight to get close to 100% power. The charger can be connected to the handset at all times when
constant measurement is required. If extended use of the handset is required, it is best to leave the
device plugged in.
When fully charged, the terminal voltage peaks at around 4.25V . The terminal voltage is displayed on
window menu M56 (press buttons M, 5, and 6, in succession). When the battery is nearly consumed, the
battery voltage drops to below 3V. The approximate remaining working time for the battery is indicated
Red LED