Wavetek 147 Specifikace stáhnout pdf (Strana 152)

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Measuring System Performance: CSO/CBT Measurements

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

certain frequencies in the spectrum. These beats cause 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.

The capability to make these measurements enables you to troubleshoot

and correct the cause of this unwanted distortion.

NOTE: Acterna recommends that a < 12 MHz band pass

filter be used to limit the amount of intermodulation

distortion caused by overload of the RF input of the SDA-

5000. If used, a preamplifier should be placed between the

band pass filter and the receiver.

In Spect mode, press the CSO/CTB soft key to initiate CSO/CTB

measurements. The SDA-5000 first switches to a 30 kHz resolution

bandwidth (see Fig. 6-11), measures the carrier, and then prompts you to

turn the carrier off. The signal must be unmodulated.

Fig. 6-11 CSO/CTB, Carrier ON

Press OK when the carrier has been turned off.

CSO/CBT MEASUREMENTS

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