Hardware System Clock; Table 5-1 Hardware System Clock Specifications - Hitachi HF-W2000 58 Instruction Manual

5. SPECIFICATION

5.7 Hardware System Clock

This equipment has a hardware system clock that uses an RTC (real-time clock) IC.
The clock has a built-in calendar and continues to work by using a backup battery, even when the system power is
off.
#: Rough estimates when the ambient temperature is 25°C.
The system regularly updates the internal clock by using a periodic timer. The internal clock is adjusted by reading
the time and date from the hardware clock when, for example, the system starts.

Table 5-1 Hardware system clock specifications

Item
Time function
Date function
Precision
Battery backup
Specifications
Hour/minute/second (24-hour clock)
Year/month/day
±4 seconds per day
Lithium battery
5-18
#