Power Supply; Rechargeable Battery Operation; Mains Operation; External Power Supply - Ahlborn ALMEMO 6290-7B Operating Instructions Manual

Power Supply

3. POWER SUPPLY
3.1 Rechargeable Battery Operation and Voltage Control
For power supply 4 rechargeable NiCd batteries (4.8V/800mAh) are integrated
in the instrument. They have a current consumption of ca. 11mA and last,
without printing, for an operating time of ca. 90 hours. During continuous
operation as a printer, one battery charge lasts ca. 5000 print lines (cycles), ca.
15000 cycles can be reached in plot mode. The instrument must be operated
in sleep mode (see 7.2.5) to reach the above values during long term
operation. When ca. 10% capacity is reached, the
display. The built-in printer will stop its operation after printing the following:
STOP TIME:
Battery discharged
All other instrument functions remain available. If the option 'Memory' is
available the data logging is also still continued. If the rechargeable battery is
completely discharged, the instrument will switch off. However, measuring data
and time will be maintained in the battery buffered memory (see 3.5).
Generally, the batteries should be recharged, at latest, when the symbol
is displayed, using the supplied mains adapter ZB 6290-NA, otherwise the
batteries can suffer damage from deep discharge. Rechargeable batteries
must always be charged beforehand if the instrument has been out of
operation for a few months.

3.2 Mains Operation

For external supply of the instrument and for recharging the batteries the
supplied mains adapter ZB 6290-NA (7.5V/450mA) must be connected to the
rear socket (9). After plugging in, the small lamp ´LOAD´ is illuminated and
indicates that the batteries are being recharged. The batteries are recharged
after 4 hours, at maximum, and the small lamp starts to flash, i.e. the charger
circuitry has switched to trickle charge. The mains adapter can, offering a
buffer operation, stay continuously connected to the measuring instrument.
3.3 External Voltage Supply
It is also possible to connect another DC voltage, 7.5V ± 5% (450mA), to the
socket (9). The connection is performed by using a low voltage connector
(NES1 according to DIN 42323), centre pin to negative. However, the
electrically isolated supply cable ZB 6290-UK must be used if an electrical
isolation between power supply and transducers is required or if a larger input
voltage range 10...30V is required. It allows to operate the measuring
instrument with 12V or 24V mains supply.
13
hh:mm:ss

ALMEMO 6290-7B
BAT
symbol appears in the
BAT