Power Supply - TESTO 400 Instruction Manual

The instruments in the testo 400 series can be operated using the following:
• 4 standard batteries (Type: Al/Mn round cell) incl. 1 Li button cell to store RAM data when
changing batteries - parallel power supply via mains unit is also possible without damaging
batteries.
• 4 standard rechargeabe batteries (Type: round cell) incl. Li button cell - a mains unit can also
be connected simultaneously. It is not possible to recharge the batteries in the instrument.
• 2 quickly rechargeable Testo battery rods incl. Li button cell - the battery rods can be
recharged via the mains unit in the instrument. Mains operation with empty rechargeable batteries
is possible. It is normal that the mains unit heats up. It is protected from overheating by a
thermal protection switch.
• Power supplied solely via mains unit (without batteries/rechargeable batteries) is not
recommended because if the power supply breaks down or the mains plug is pulled out during
measurement, undefined switching modes for the instrument processor may occur.
The level of charge or battery quality can be queried in the main menu under INSTRUMENT -
P
OWER :
Display when batteries/rechargeables are full:
First message if battery is getting low (symbol at top left):
The instrument switches off at 4.5 V. To recharge batteries: connect mains unit and switch off the
instrument (the rechargeables are not recharged during measuring). The charging time is approx. 4
h. The "-C" symbol at the top left stands for the connected mains unit.
If the rechargeable batteries are totally discharged, it is possible that they may not be recog-
nised and therefore not charged. If this happens, press the following button combination pro-
vided a mains unit is connected and the instrument is switched off ("Power" appears in the header):
Press and
recharge" appears at the top of the display.
Ensure there are rechargeable batteries in the instrument, do not activate the charging
current when the batteries are in place.
The following service lives result:
Instrument configuration
testo 400 + 2 T/C probes
testo 400 + 100 mbar pressure probe
testo 400 + CO2 probe
testo 400 + 3-function probe*
testo 400 + 2 3-function probes*
Buffer capacity of Li button cell with empty batteries/rechargeable batteries: 20 to 27 days.
Power consumption of instrument (without probe) when measuring: approx. 40 mA.
Service life is at least halved if equipped with additional display illumination (approx. 60 mA).
* Thermal measurement in 3 function probes can be switched off in order to extend the lifetime.
simultaneously. Start up the instrument again after approx. 1 min. "Quick
Service life with
700 mAh rech. batt.
13 h
13 h
3 h
3 at 4 h
at max. 5 m/s
1.6 h
at. 2 to 3 m/s
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Power supply

6.0 to 6.4 V
4,8 V
Service life with
2300 mAh battery
42 h
42 h
>7 h