7. Power supply
19
7.3
Mains operation
To power the device from an external source preferably use the mains adapter
ZA 1312-NAx (12 V / 1,5 A); connect this to the DC socket (3). The sensor volt-
age is set automatically to 12 volts. If rechargeable batteries are being used,
these will then be charged. (see 11.7)
7.4
External DC voltage supply
It is also possible, at DC socket (3), to connect a USB data supply cable (5 V,
0.4 A) ZA1919-DKU5 or, via ALMEMO
®
connector (ZA1000-FSV), to connect
any other DC voltage (6 to 12 V, minimum 200 mA). If, however, the power
supply has to be electrically isolated from the transducers or if a larger input
voltage range (10 to 30 V) is required, then electrically isolated supply cable
ZA2690-UK (250 mA) or -UK2 (1 A) must be used. It will then be possible to
use the measuring instrument in a 12-volt or 24-volt on-board supply system.
7.5
Sensor Supply
At the ter (plus) and - (minus) in the ALMEMO
®
connector there is a
configurable sensor supply voltage available (self-healing fuse, 500 mA). The
sensor voltage supplied by the device is set automatically, depending on the
minimum supply voltage requirements of the sensors, to 6 V (200 mA), 9 V (150
mA), or 12 V (100 mA). (s. 11.4.2) (see also the
power supply
menu 11.7)
Other voltages (12, 15, or 24 volts or references for a potentiometer and strain
gauge) can also be obtained using special connectors. (see Manual. Sections
4.2.5 and 4.2.6) .
7.6
Switch On/Off, Reinitialisation
To
switch on
the device press the key
ON PROG
r
(6)
in the middle of the cursor
block. There always appears the last called up meas. menu first in the display.
To
switch off
the device leave a working menu with
<ESC>
r
and press the softkey
<P-OFF>
r
in the menu selection. After switch-off the real time clock continues its
operation and all stored data remains available (s. 7.7).
If the device shows an irregular behaviour due to interference influences (e.g.
electrostatic charging or battery failure), the device can be reinitialised. The
re-
set
can be achieved if the key
F1
r
is pressed during switch-on. If the complete
device programming with times, terms of device, user menus etc. is to be set to
the delivery defaults, the key
F4
r
must be pressed during switch-on. Only the
sensor programming within the ALMEMO
®
connectors will not be attached by
this reset.
The reset function on power are not possible when the AC adapter is
plugged in and the batteries are charged!
