Power Supply; Memory - Ahlborn ALMEMO 710 Operating Instructions Manual

Power supply

13.8 Power supply
Power for the measuring instrument is supplied by two rechargeable lithium-ion
battery packs with 'battery capacity' 15.6 Ah. In the 'power supply' menu, the
'battery voltage' display provides an estimate of the battery's remaining oper-
ating time. At 3.6 V the battery symbol in the status bar starts to flash and at
3.4 V the device switches off automatically. In 'charge / discharge current'
charging can be set to 'off', 'slow', 'normal', 'fast', or 'automatic'.
Providing the device is switched off, 'automatic' can be selected; standard
mains adapter ZA1312-NA9 (12 V, 2.5 A) is used; fast charging the batteries
will then take about four hours.
However, while the device is switched on, 'normal' should be selected; charg-
ing will then be at a lower current; this ensures that measuring conditions, es-
pecially with thermocouples, are not adversely affected by heat that might oth-
erwise be generated. In these circumstances it is possible to force fast charg-
ing - but only with the appropriate settings (3). The other two options restrict
possible heating even further. If the mains unit proves to be too weak, one of
these will be selected automatically. The heating risk can also be reduced by
adjusting the brightness of the display lighting.
The 'charge / discharge current' is monitored continuously and from this the
'remaining battery capacity' and the 'probable operating time' are calculated.
For the purpose of powering the sensors the 'sensor voltage - setpoint' of 6 /
9 / 12 V is derived automatically from the minimum sensor supply voltage for all
sensors; however, this can if so required be replaced with a higher value. With
sensors that draw a lot of current but cope with relatively low voltage, a carefully
chosen sensor voltage can help save a considerable amount of energy. The ac-
tual value 'sensor voltage - actual' is measured internally and is also displayed.
If a mains adapter is connected, the sensor voltage will always be set to 12 V.
The mains adapter data is displayed in 'mains adapter voltage' and 'mains
adapter current'. For the duration of the charging phase the green LED
'CHARGE' (5) remains continuously lit; as soon as the battery is fully charged, the
adapter switches over to trickle charge and the LED goes out.

13.9 Memory

´Settings´ > ´Memory´ provides data referring to the memory. (see XREF)
´Memory status´ gives a graphical display of the memory's utilization level.
´Memory total´ indicates the total memory size - in KB for internal or in MB for
external (memory card).
´Memory free´ indicates the remaining memory capacity - in KB for internal
and in MB for external (memory card) - and the memory time - in format
D.hh:mm - still available in the current scan cycle with the current sensor con-
figuration.
´File name´ is the name of the current file.
There is also the function ´Delete memory content´. However, before mem-
ALMEMO ® 710 65