12. Device configuration
12.3 Switching OFF automatically
In menu item ´
AOFF
´ the device can be programmed to switch OFF automati-
cally if no key is touched for a certain settable number of minutes; this will help
save the batteries. This automatic device switch OFF will not take effect if the
setting is ´- -´ or if a mains adapter or interface cable is connected. If the de-
vice is powered from an external supply manual switch OFF can be prevented
by selecting the setting ´
noOFF
´. To switch OFF in this case the external power
supply would have to be unplugged.
12.4 Device locking
The measured value in the main field of the display can be manipulated by
pressing key
CLR
and setting it to zero. This function can be evaluated in dif-
ferent ways or even switched off in cases where there is a risk of accidentally
activating relative measuring by zero-setting the measured value.
Loc
parameter :
0 The offset is saved in RAM, base or zero-point - depending on locking
1 The offset is saved in RAM only.
2 Relative measuring is locked
13. TROUBLE-SHOOTING
The ALMEMO
®
2450-1 measuring instrument can be configured and pro-
grammed in many versatile ways. It is suitable for connecting a wide variety of
different sensors, additional measuring instruments, alarm signaling devices,
and peripheral equipment. Given these numerous possibilities the device may
in certain circumstances not behave quite as expected. The cause of such un-
expected behavior is only very rarely a device defect; more usually it is incor-
rect operation by the user, an invalid setting, or unsuitable cabling. In such
event try to pinpoint and clear the problem with the aid of the following tests.
Error:
No display, display malfunction, keys do not react
Remedy:
Check the power supply; replace the batteries; switch off and then
on again; if necessary re-initialize (see 7.5).
Error:
Measured values are incorrect.
Remedy:
Check all the channel programming very carefully, especially the
base value and zero-point (sensor programming and special func-
tions menu).
Error:
Fluctuating measured values or the system hangs in mid-operation.
Remedy:
Check the cabling for any inadmissible electrical connections,
Unplug any suspicious sensors.
Connect hand-held sensors in air or phantoms (for thermocouples
short-circuit AB) and check.
Connect the sensors again one at a time and check successively.
If a fault persists for any one connection, then check all wiring; if
26 ALMEMO
®
2450-1
