Sensor Supply; Switching On / Off, Reinitialization; Data Buffering - Ahlborn ALMEMO 5690-2M Operating Instructions Manual

Operation with rechargeable battery (only with module ES5690-AP)
hours the batteries are fully recharged and the LED goes out again. After a cer-
tain period the batteries are recharged again; the charge circuitry then switches
over to trickle charge. The mains adapter can thus be left permanently con-
nected 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 de -
vice from warming up during thermocouple measurement, you can connect the
mains unit to the DC socket (6g).

7.4 Sensor supply

At the terminals + (plus) and – (minus) in the ALMEMO connector there is, for
®
mains operation, a sensor supply voltage, approx. 12 V, 400 mA, available
(self-healing fuse, 500 mA). During battery operation the battery voltage is
available, 9 to 11 V. Other voltages (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).

7.5 Switching ON / OFF, Reinitialization

To switch the device ON press the ON-PROG key (3); the ´ON´ lamp should light
up as verification.
To switch the device OFF press the ON-PROG 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 7.6).
If the device behaves abnormally as the result of interference (e.g. electrostatic
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 can reinitialize the device. To activate Reset
press F1 r when switching on. To restore all device programming (including
times, device designation, user menus, etc.) to the factory default settings press
F4 r when switching on. Only the programming of the sensors in the ALMEMO
®
connectors remains unaffected.

7.6 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.
ALMEMO ® 5690-2M 19