Multi LAN 350
Operation
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If the supply voltage drops below 6.5V the instrument switches itself off to prevent
uncontrolled behaviour because of too low supply.
5.13.7 Set Date/Time
Date and time are attached to the saved results in the memory.
Setting procedure
After entering this menu the selected item flashes.The following actions can now be
performed:
Left, Right keys
select next or previous item
Up, Down keys
select date/month/year/hour/minute
OK
confirm the set date/time
ESC
leave menu without any changes
5.13.8 Backlight mode
After entering this menu the following actions can be performed:
Left, Right keys
switch between available modes
OK
leave menu and confirm the selected mode
ESC
leave menu without changes
Two backlight modes are available:
AutoOff mode:
the backlight is automatically switched off after 20 seconds.
Normal mode:
no Autooff.
In order to save battery power it is recommended to use the Autooff mode.
5.13.9 Noise Filter
Excessive noise degrades the measuring performance. Presence of noise often results
in:
- permanent FAILs (mostly on NEXT and ELFEXT)
- too low HEADROOM is reported
- spikes in result plots.
Typical noise sources are:
- active electrical equipment near the tested LAN wiring
- live network traffic in adjacent cables and connectors
- other HF signal sources near the tested LAN wiring (cable TV, xDSL, …).
To improve the results the following actions can be taken:
- Use one of the two built-in filters
- Determine the noise sources and switch them off.
The instrument checks for excessive noise before each test.
Two filters are available:
No:
filters are switched off
Low:
the noise is reduced by averaging the results (autotest last 3 times longer)
High:
the noise is reduced by averaging the results (autotest last 5 times longer)
