Wavetek 3HRV Bedienungsanleitung PDF herunterladen (Seite 3)

Fast-update spectrum displayfor

detecting ingress in the field

The Spectrum mode has the speed and

versatility to effectivelytroubleshoot

difficult system problems. A program-

mable dwell time enablesthe meter to

stay on each frequency longer to catch

more ingress.PeakHold modecaptures

and saves transient burstssuch as

evasive return path electrical noise.

The SDA-4040D detects signals as fast

as 5 µs, in both Zero Span and Continu-

ous modes. The preamp and lowpass

filter on the SDA-4040D assures that

ingress can be measured on devices

with bidirectional testpointsor test-

point values of 30 dB or more.

PathTrak Field View option

When a networkis equipped with the

Acterna PathTrak Performance Moni-

toring System, system technicianscan

benefit from the ultimate tool to com-

bat ingress – the PathTrakField View

option for the SDA-4040D. With Field

View, the SDA-4040D receives a return

path headend spectrum broadcast

from the PathTrak unit, and then com-

pares it with a return path spectrum at

any field test-point. The side-by-side

spectrum comparison instantly reveals

whether the ingress source is origi-

nating at the technician’s current

testpoint or at a different location.

The comparative spectrum technique

reduces noise/ingress troubleshooting

time dramatically, since the technician

can immediatelyverify whether correc-

tive action performed in the field (local

trace), results in improvement in the

headend spectrum (remote trace).

Sweepless Sweep

®

provides

nonintrusive frequencyresponse

The trademarked Sweepless Sweep

passively provides frequency response

information about a networkby meas-

uring active carriers. The SDA-4040D

stores the levels of all active carriers at

one reference pointin the network,

and then compares the relative levels

to another point within the network;

just like referenced sweep, but without

the need for a transmitter.

Powerful and intuitive standardized

graphical displays

All measurement results are presented

to the user in clear, highly informative,

summarydisplays.Thegraphicspresent

the information in a waythat the tech-

nician wantsto see it with no further

interpretation required. For example,

testpoint compensation values are

entered at the start of testing. Displays

then calculate actual levels auto-

matically, minimizing field errors.

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Zero span/time domain expert mode, showing the

TDMA bursty return path cable modem power ramp

of 3.5 ms

Reverse digital modem signal PathTrak Field View option compares headend

node spectrum with field testpoint spectrum

Reduced training time

With SDA Series products, all levels of

instruments are familiar to the techni-

cian regardlessof which is learned first

because the same user interface con-

ventions are used acrossall product

families. The time needed for a trainee

technician to learn to use the instru-

ment isconsiderably shorter than for

alternative test equipment. This means

urgent upgrade projectsmake the most

efficient use of limited resources when

SDA Series products are used.

Comprehensive testing

The SDA-4040D provides an extensive

set of signal analysis features designed

for proving and improving network

quality. All tests utilize a practicaluser

interface that normallyrequires only a

one-button keystroke.

Level measurement

The SDA instruments provide a

comprehensive single-channel display

with tuned channel, video frequency

and level, audio frequency and level,

and the difference between video and

audio carrier levels.

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