External DC voltage supply
7.3 External DC voltage supply
The DC socket (3) can also be used to connect another DC voltage, 6 to 30 V
(minimum 200 mA). It can be connected using ALMEMO
®
plug ZA1000-FSV.
If, however, the power supply has to be electrically isolated from the transducers,
then electrically isolated supply cable ZA 2690-UK must be used. It will then be
possible to use the measuring instrument in a 12-volt or 24-volt on-board supply
system.
7.4 Sensor supply
At the ter (plus) and – (minus) in the ALMEMO
®
plug a sensor supply
voltage of 6 to 12 V (maximum 150 mA) is available automatically; this corre-
sponds to the minimum sensor voltage programmed for the measuring chan-
nels. (see Man., 6.10.5) Other voltages (15 V or references for a potentiometer
and strain gauge) can also be obtained using special plugs. (see Man., 4.2.5 ,
4.2.6).
7.5 Switching ON / OFF, reinitialization
The
ON PROG
r
key (5) is located in the middle of the keypad; to s
witch the de-
vice ON
press once briefly and release; to
switch the device OFF
press and
hold down. When the device switches OFF all saved values and settings are
retained intact. (see 7.6)
If interference (e.g. electrostatic charge, battery failure) causes the device to
behave abnormally, it can be reinitialized. To activate
Reset
press and hold
down key
F2
r
when switching on. This will restore all settings to factory de-
fault status - including the configuration of internal measuring channels - but
excluding device designation. Sensor programming in the ALMEMO
®
plugs
will remain unaffected.
7.6 Data buffering
The sensor's programming is stored in the EEPROM on the sensor plug; the
device's calibration and programmed parameters are stored in the EEPROM
on the device itself; both are fail-safe.
8. PAIRING
On leaving our factory the wireless measuring instrument and the sensor mo-
dule are paired; i.e. these two components interconnect immediately and auto-
matically as soon as they are switched on. If you wish to have the wireless
measuring instrument interconnected with some other sensor module, such
pairing can be performed manually in the following way.
1. Switch the wireless measuring instrument OFF.
2. Plug the sensor module into the wireless measuring instrument (socket M0).
3. Switch the wireless measuring instrument ON by pressing the
ON PROG
key (5).
4. These components should now be paired automatically.
PAIR
and
RDY
should
ALMEMO
®
2790
13