Rechargeable Battery Led Status; Mains Operation; Switching The Testo 400 On And Off - TESTO 400 Instruction Manual

8 Commissioning

Rechargeable battery LED status

8.1.2
LED status
Lit up green
Flashing green (rapidly)
Flashing green (slowly)
Flashing green/red
Flashing red

Mains operation

8.1.3
1 Connect the USB mains unit to the USB interface/mains unit socket of
the testo 400 (see Section 7.2).
2 Connect the mains plug of the mains unit to a mains socket.

The measuring instrument is powered via the mains unit. The battery
charges.

Switching the testo 400 on and off

8.2
Current Action
status
Instrument off Press and hold down the
button (> 3 sec)
16
Description
Instrument is supplied with power
(battery fully charged)
Instrument is on and being supplied
with power (battery is charging)
Ready for operation in battery mode
Instrument is off and being supplied
with power (battery is charging)
Internal error, please restart. If the
error has still not been rectified,
please carry out a factory reset (see
Section 10.3.7). If the problem
persists, contact Testo Customer
Service.
Function
Instrument is switched on