Wavetek 147 Especificações descarregar pdf (Página 260)

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

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Fig. 13-11 The C/N Screen

To make a carrier to noise measurement, press the C/N measurement mode

key. The C/N ratio of the tuned channel or frequency will be displayed.

Bandwidth Adjustments

To edit the bandwidth, press the BW soft key. The bandwidth can be

adjusted by using the up and down diamond keys or by entering a value

using the numeric keypad and then pressing the Enter key. The FCC

specification for C/N measurements is a bandwidth of 4.2 MHz. CATV

organizations outside of the United States may have different requirements.

Noise Offset Frequency Adjustments

The frequency at which the noise level is measured is the carrier frequency

plus the noise offset. To adjust the noise offset, press the OFFSET soft key.

The offset can be adjusted by using the up and down diamond keys or by

entering a value using the numeric keypad and then pressing the Enter key.

NOTE: BW and Noise Offset values can be defined

individually for each channel. When tuning by channel

number, the BW and Noise Offset values can be adjusted

using the Offset and BW soft keys. However, these

adjustments will affect the C/N screen only and will not

change the setup value in the channel plan.

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