Sensor Supply; Switching On / Off; Data Buffering - Ahlborn ALMEMO 5690-1M Operating Instructions Manual

thus be left permanently connected to the measuring instrument in buffer
mode without risk of overcharging the batteries. If you prefer not to recharge
the batteries, e.g. to prevent the device from warming up during thermocouple
measurement, you can connect the mains unit to the DC socket (2g).
 
If you intend to replace the rechargeable batteries yourself
please be absolutely sure that you change all of them and that
the new batteries provide the same capacity; failure to heed this
advice may cause high-speed charging to malfunction and the
batteries may be damaged.

6.4 Sensor supply

During mains operation there is, on terminals + (plus) and – (minus) in the
®
ALMEMO connector, a sensor supply voltage available, 12 V, 400 mA (self-
healing fuse, 500 mA). During battery operation the battery voltage is availa-
ble, 9 to 11.5 V. Other voltages (12, 15, or 24 V or references for a potentiome-
ter and strain gauge) can be obtained using special connectors; (see Manual
4.2.5 and 4.2.6).

6.5 Switching ON / OFF,

To switch the device ON press the ON-OFF key (2e); if all is in order the "ON"
lamp should light up.
To switch the device OFF press the ON-OFF key and hold down for approx. 1
second. After the device is switched off the real-time clock continues to run
and all saved values and settings are retained intact; (see 6.6).
If the device behaves abnormally as the result of interference (e.g. electrostat-
ic or mains failure), you are advised try first of all to clear the problem simply
by reinitializing, i.e. switching off and then on again.
If this does not help then you are advised to restore all device programming to
the factory default settings. The device can be reset by setting the code switch
G (2d), before switching on, to address 99. This has the effect of also resetting
the baud rate setting on the data cable to 9600 baud. However, the program-
ming of the sensors in the ALMEMO

6.6 Data buffering

The sensor's programming is stored in the EEPROM on the sensor connector
and the device's calibration and programmed parameters are stored in the
EEPROM on the instrument itself, both on a fail-safe basis. The memory data
is also saved in non-volatile EEPROMs. The date and time-of-day are buffered
by a dedicated lithium battery; even when the device is switched off and with-
out batteries this data is retained intact for years.
®
connectors always remains intact.
6. Power supply
15