Wavetek 3HRV Manual de usuario descargar pdf (Pagina 6)

! Limit checks can be instantly viewed after

identifying channel of interest with a marker in

scan mode display.

Carrier-to-Noise Measurement:

In-Service.

Carrier-to-noise mea-

surement (on non-scrambled

channel) is just as easy, and there is no need

to remove modulation from the video carri-

er. No tunable preselector filter is needed.

! In-service carrier-to-noise.

Hum Measurement: In-Service.

Measuring hum on a channel

(non-scrambled) is as simple as

pressing the "HUM" key. And since the

instrument is battery powered, the measure-

ment is independent of ground loops, there-

fore isolated from the line (mains). Hum

reveals itself as either single (60 Hz) or dou-

ble (120 Hz) horizontal bars across the video

screen. The level of either can be measured.

! In-service HUM (PAL/NTSC compatible).

Modulation Measurement.

Includes NTSC, PAL and SECAM

formats. Demodulation of the

audio is done for both AM and FM. FM is

used to hear audio distortion on the FM

radio channels or the sound of the TV pro-

gram. AM is used to recognize short-wave

interference signals in the reverse band.

! Depth of modulation.

Local Amplifier Alignment with

Loopback Tests.

The SDA

Loopback tests allow the techni-

cian to quickly perform frequency response

measurements of active or passive field

devices using a single meter. Either a CW

or sweep signal may be generated from the

SDA unit and injected to the input of a

device under test. The DUT output can

then be measured by the SDA, providing

valuable information like gain, loss, roll-off

or frequency response. The CW loopback

test is available on the SDA-5000 when

ordered with OPT 1. The CW loopback and

Sweep Loopback features are available on

the SDA-5000 when ordered with OPT 2.

! Local Loopback Sweep: Performs initial

setup of optical nodes or measuring the gain

or loss of individual components in the field.

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