Testo testo 476 Tachometer, 30 - 12 500 rpm 0563 4760 Data Sheet

8

5. Power supply

5.1 Mains unit Setup

When first using the mains unit, select the appropriate plug
connector for use in the AC power outlet (several styles
provided). Align the holes in the rear side of the plug con-
nector (



) with the pins in the receptacle in the mains unit

body (



) and push. When properly seated, you will hear a

click and the plug connector will not move. The charger is
now ready for use.

Change the Plug Connector
To remove the connector from the mains unit, slide the
switch on the mains unit (



) up and the connector will pop

out. To insert a different plug connector follow the procedu-
res described in Battery Charger Setup.

5.2 Charge the battery

Charge the battery before first use or when the “LOW BAT“
indicator appears on the LCD. 

NOTE: 
When the “LOW BAT” indicator is shown, the 

testo 476

has

approximately 6 minutes of operating time remaining. When
the “LOW BAT” indicator flashes on and off, the battery is
empty and the 

testo 476

will automatically switch off.

Before first use, you must set up the battery charger. Refer
to 5.1 Battery Charger Setup.
1 Insert the barrel plug end of the mains unit into the

power supply socket on the 

testo 476

. 

Plug the mains unit into a mains socket.

2 The red light on the mains unit will illuminate continuous-

ly while the battery is charging.

- The instrument will recharge in about five hours.





