Wavetek 147 Dokumentacja Pobierz pdf (Strona 265)

100

101

Description and Basic Operation of the SDA-5500 and 5510: Basic Modes of Operation

241

How To Make CSO/CTB Measurements

CSO (Composite Second Order) is a clustering of second order beats at any

frequency in the spectrum, which causes interference to picture quality when

they fall within the video bandwidth. CTB (Composite Triple Beat) is a

clustering of third order distortion products usually around the video carrier

frequency.

By making these measurements, you can troubleshoot and correct the

cause of this unwanted distortion.

NOTE: A < 12 MHz band pass filter is recommended to

limit the amount of intermodulation distortion caused by

overload of the RF input on the receiver. If you use a

preamplifier, it should be placed between the bandpass

filter and the receiver.

Press the CSO/CTB soft key to initiate CSO/CTB measurements. The unit

will first switch to a 30 kHz resolution bandwidth, measure the carrier, and

then prompt you to turn the carrier off (Fig.13-16).

Fig. 13-16 The Carrier Measurement Screen

Press the OK soft key after the carrier has been turned off. The CSO/CTB

measurement will be displayed (Fig.13-17).

1 2 ... 260 261 262 263 264 265 266 267 268 269 270 ... 409 410

Komentarze do niniejszej Instrukcji

Brak uwag

Wavetek 147 Dokumentacja Strona 265

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Pomiary, testowanie i kontrola Wavetek 147