10. TROUBLESHOOTING
The data logger ALMEMO
®
2290-8 can be configured and programmed in
many different ways. It allows for a connection of many different sensors,
additional measuring instruments, alarm signalisers and peripheral devices.
Due to the large variety of options it is possible that, under certain conditions, it
does not perform as the user would expect. In most cases this will not be
related to a defective device but to operating errors such as wrong settings or
an inadmissible wiring. The following tests should be performed to correct or to
correctly identify the error.
Error:
No display data or all display segments are permanently illuminated.
Remedy:
Check power supply, recharge battery, switch off and on again,
reinitialise (see 3.3)
Error:
False measured values.
Remedy:
Thoroughly check the programming of the channel (especially base
and zero point), query the entire programming by means of the
software AMR-Control or the terminal and command
P15
(see
manual 6.2.3) and
f1 P15
(see manual 6.10.1)
Error:
Varying meas. values, segment test or blockage during operation.
Remedy:
Check cabling for inadmissible electrical connection,
disconnect all suspicious sensors,
hold hand-held sensors in air or connect dummies and check (short
circuit AB at thermocouples, 100
Ω
at Pt100 sensors), then reconnect
sensors successively and check. If an error occurs with one sensor,
check the wiring, isolate the sensor if necessary, prevent influences
from disturbances by shielding or twisting.
Error:
Data transmission via interface does not function.
Remedy:
Check interface module, connections and settings:
Are both devices set to the same baud rate and transmission mode
(see 8.1)?
Is the correct COM interface addressed at the computer?
Is the output channel set to ´U´ (see 7.3.1)?
Is the printer set to ONLINE mode?
Are the handshake lines DTR and DSR active?
A small interface tester with LEDs is very useful for checking the data
flow and the handshake lines (during standby mode the data lines TXD
and RXD are on a negative potential of approximately -9V and the diodes
are illuminated green. The handshake lines DSR, DTR, RTS and CTS
have a positive voltage of approxi9V and the LEDs are
illuminated red. During the data transmission the data lines must flash
red).
ALMEMO
®
2290-8
47
Appendix
