Appendices
Network Considerations
H
H-15
If you have replaced an instrument with another with the same IP address
(same BCN in the isolated network mode), you must reboot your PC. The
TCP/IP software builds a table of the relationship between an instrument IP
address and its Ethernet address. If you attach a new device to the network
with an IP address that has been previously used, the relationship between the
IP and Ethernet address will be wrong, causing communication with that
instrument to fail. Rebooting the PC clears the IP/Ethernet address relationship
table (the ARP table).
Make sure that there is only one TCP/IP stack software package running on
this PC.
3.
Instrument to PC communication starts OK, but there are frequent
communication interruptions reported.
There may be times on a very heavily loaded general network where it is
impossible to maintain high enough speed communication with the instrument
to avoid communication interruptions. In this case, consider moving the
instrument to an isolated network or a different subnet.
4.
Fluke DAQ can not keep up with the scan rate selected in the instruments.
This is indicated by the count of the number of scans in the instrument
increasing continually, to the maximum count, during a data acquisition run.
Once the maximum count is reached scan data may be lost.
Move your instrument to a less loaded subnet of your network or isolate the
2680 Series instruments on their own network.
If possible, increase the scan interval.
Make sure that there are few or no other Windows applications running at the
same time as Fluke DAQ.
Upgrade to a faster PC and disk drive and increase the amount of RAM in
your PC.
Disable the Windows Screen Saver function or make sure that it doesn’t
activate during data collection.
Close any dialog boxes that you have open in Fluke DAQ. Avoid operations
which open dialog boxes, such as configuring an instrument, while logging
data at high speed.
Use of disk caching utilities increases throughput to the data files. However,
data could be lost if the PC crashed suddenly due to power failure or
malfunction.
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