Wavetek 3ST Manuel d'utilisateur télécharger pdf (Page 2)

Stealth Sweep System

Comprehensive Testing

The 3SR Receiver is a full-featured

signal analysis meter with a full

spectrum display and analog rep-

resentation of single channel

measurement data. When tuned to

a channel, comprehensive infor-

mation is provided: tuned channel,

video frequency and level, audio

frequency and level, the difference

between video and audio carrier

levels and battery charge condition.

These screens may be printed

directly, and the levels may be

stored and printed or uploaded to a

PC as part of an Autotest.

Extensive Auto Test Capability

Automated tests can be scheduled

to perform either FCC compliance

tests, or they can be initiated

immediately in order to log

performance at individual nodes,

amplifiers, or other test points.

A wide range of tests can be

performed automatically, including

signal levels, C/N, hum and depth

of modulation. Providing

unprecedented flexibility, the

Stealth enables the operator to

designate which tests to perform on

which channels. Because tests are

non-intrusive, it’s no problem to

test all parameters on all channels.

After a test is performed, results

can be displayed on the Stealth

screen with a pass/fail indication on

a variety of limits. Limits can be

set for FCC or other government

standards, or to system preferences.

Data taken during any automated

test, or sequence of automated

tests, can be viewed with a pass/fail

indication for each of the limits,

and the operator can scroll through

the stored data to look at specific

measurement results. Automated

test results can be printed directly

to a printer or uploaded to a PC

using StealthWare to store and

manage the data or format reports.

Measuring hum on a channel is

as simple as pressing the “HUM”

key. A CW carrier is no longer

required, but the channel must not

be scrambled. A carrier-to-noise

measurement is just as simple, and

again, there is no need to remove

modulation from the video carrier.

Digital QAM Carrier Level

Measurement

This feature permits accurate

average power measurements of

digitally modulated (16 and 64

QAM) carriers. The user simply

specifies that the channel is a

"digital carrier" type in the channel

plan, and then indicates the

bandwidth of the carrier to be

measured. When a digital channel

is selected, the instrument auto-

matically switches to an RMS

detection mode, makes and

processes the measurement and

displays the result on the LCD.

The levels are displayed in similar

fashion to "single" carrier types.

Informative Tilt Display

Before initiating a sweep at a

specific amplifier test point, the

technician typically balances the

pilot levels. The “tilt” mode

simplifies this step by displaying a

bar graph with up to nine differ-

ent user-selected video carrier

levels represented. The levels of

high and low pilots are shown,

along with the difference between

these carrier levels. From this

mode, the operator can quickly

switch to sweep by pressing the

“sweep” key.

Channel Scan Mode

To get a quick look at absolute

carrier levels, the “scan” mode is

used. A bar graph showing all

carrier levels is displayed. A

marker selects which of the

carrier's level is displayed on the

bottom of the screen. Pressing

the “level” key quickly changes

the mode to show more detailed

measurement information about

the marked channel.

1 2 3 4 5 6

Commentaires sur ces manuels

Pas de commentaire