Rion VM-55, Instruction Manual, Page: 28 / 204

16
Preparations
AC adapter
To operate the unit with the AC adapter, connect it as shown below.
Important
To prevent the risk of damage, do not use any
AC adapter other than the NC-98 series.
The AC adapter NC-34 series used for the con-
ventional vibration level meter cannot be used.
OUTPUT
X Y
Z
AC adapter NC-98 series
To AC outlet, 100 V to 240 V, 50/60 Hz
DC IN connector
Open the side cover
Backup battery
The unit uses a backup battery (rechargeable battery) to operate the clock.
While power to the unit is on, the backup battery will be charged. It will
also be charged while power to the unit is off if external power is connected.
The relationship between charging time and retention period is shown below.
A full charge of the backup battery is achieved after 24 hours.
Charging time Retention period
1 hour 2 days
12 hours 30 days
24 hours 45 days
Use the AC adapter when connecting external power for battery charge while the
unit is turned off. The service life of the backup battery is limited. You should
have the battery replaced about once every two years. Please contact your supplier.
Note
The charging time, retention period and service life of the
backup battery may vary depending on the operating condition.
When the backup battery is old, the retention period will be
shorter.