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9. TROUBLESHOOTING
The ALMEMO
®
6290-7B measuring instrument with built-in printer 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 permanently illuminated.
Remedy:
Check power supply, recharge battery, switch off and on again,
reinitialise (see 3.4)
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 the external power supply and output modules,
disconnect suspicious sensors and replace them by hand-held
sensors held in the air or by dummies (short circuit AB at
thermocouples, 100
Ω
at Pt100 sensors).
If the fault is eliminated by that, check the wiring,
isolate the sensor if necessary, use an electrically isolated power
supply, 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 8.5.1)?
Is the correct COM interface addressed at the computer?
Is the output channel set to ´U´ (see 8.1)?
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).
45
ALMEMO
6290-7B
Troubleshooting
Содержание ALMEMO 6290-7B
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