6. Power supply
6. POWER SUPPLY
The following options are available for the power supply of the instrument:
3 alkaline-mignon batteries (type AA) in the extent of the delivery
Mains adapter 12V, 0.2A with ALMEMO
®
connector
ZB 2690-NA
3 NiMH-accumulators (type AA) with charging adapter 12V,1A ZB 2690-AS
Electr. isol. power supply cable (10..30V DC, 0.25A)
ZB 2690-UK
Our product line includes corresponding accessories.
6.1 Battery operation and Supply Voltage Control
3 mignon batteries are used as the standard power supply of the device. At a
current consumption of approx. 30 mA, they last for an operating time of about
100 hours. If the illumination is constantly switched on, this operating period is
reduced to approx. 20 to 50 hours (depending on the lightness). To extend the
operating time for long term recording it is possible to operate the device in
sleep mode (s. 10.2.4). The current operating voltage can be called up in menu
Power supply
(s. 10.7) in order to assess the remaining operating time.
When a remaining battery capacity of approx. 10% is reached, the symbol
´´µµµµµµµµµ¶
will be indicated in the status line of the display. If the battery is completely
discharged, the device will switch off. However, measuring data and time will
be maintained (s. 6.7). To change the batteries, the sensors must be taken off,
the rubber protection (7) be removed and the battery cover (8) at the back of
the device has to be unscrewed and stripped off in the direction of the arrow.
6.2 Accumulator operation
The batteries can also be replaced by 3 NiMH accumulators. In the accessory,
there is a corresponding accumulator set with charging adapter (ZA 2690-AS).
As the capacity of the accumulator is only about the half of the alkaline-
manganese batteries, the operating times get half as long as well. The char-
ging adapter is to be connected between mains adapter and measuring device.
It discerns the maximum current of the mains adapter and correspondingly
adjusts the charging time. Maximum current, charging current and charging
time can be controlled in the menu
Power supply
(s. 10.7). If the accumula-
tors are completely charged, the charging adapter switches to trickle charge.
Therefore, it can stay continuously connected to the measuring device without
overcharging the accumulators.
6.3 Mains Operation
For external supply of the device the mains adapter ZA 2690-NA (12V/0.2A)
must be connected to the socket DC (3). Pay attention to the mains voltage!
Operating with accumulator, the stronger mains adapter ZA 2690-NA2
(12V/0.8A) allows an especially fast charging of the accumulators in 1 hour.
14 ALMEMO 2690-8
