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The DisplayMax 800CLI is powerful enough to maintain
the headend, yet simple enough for routine installation
checks. With a wide range of measurement options,
a technician can quickly check an individual channel,
favorite channels, all channels, tilt, leakage, ingress,
C/N or HUM.
The graphic display allows a technician to view the full
system response and quickly identify problems such as
low level, roll-off, suck-outs or missing channels. In the
ingress mode, the graphic display shows a spectrum
analyzer view of the full return path, revealing any unwanted
ingress signals.
All multi-channel modes are supported by an automatic
pass/fail test that compares all measured channels
against user defi ned parameters. In less than one
minute a headend technician or installer can scan up
to 135 channels and verify that all analog and digital
channels are within tolerance.
Data recording permits all measurements to be saved
and downloaded to a computer.
VoIP and High-Speed Data Qualifier
Qualifying the drop and home wiring for VoIP and HSD
services requires more than just checking signal level.
Although proper signal level is important, verifying the
shielding properties of the coax is equally important.
Why is shielding important? Bad shielding allows unwanted
signals (ingress) to enter the return path and
slow down or abruptly stop digital services. Since more
than 90% of ingress is generated at the drop and home
wiring, it is necessary to check all installations for good
shielding.
To test the entire home for ingress, disconnect the
ground block and connect the meter to the home wiring.
Performing an ingress scan will immediately show
if ingress is present. A peak-hold mode will capture
intermittent ingress if left running for a longer period of
time.
Since shielding problems also allow forward channels
to escape from the cable, using the leakage detector
mode is very effective in fi nding the source of an ingress
problem. To measure leakage, simply attach the
supplied rubber duck antenna and press the leakage
key.
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