Ramsey Electronics SG560 Guía de usuario descargar pdf (Pagina 49)

TYPICAL TEST PROCEDURES

Digital (square wave symbol)

Digital AGC helps to get the desired deviation, and it is DC biased. This means that for an in-

put signal of 0-5V, the deviation will only go to the plus side of zero. If the input signal is

–2.5V to +2.5V, it will be centered around zero. Also if a 4-level digital signal is used the step

size will be an accurately scaled modulation change in relation to the peak voltage of the gen-

erator.

1. Connect a digital data source such as the Ramsey PE6400 to the MOD IN jack. Set its

output around 1 Vpp.

2. Set the generator for desired RF frequency. Example: 464.15 MHz, Press

3. Turn on external deviation by pressing

4. Select the tone AGC mode by pressing until you see the square wave icon.

5. Set the desired modulation type by pressing or

6. Set the required FM deviation or AM percent of modulation. Examples: for FM 3 kHz

deviation, press

For 50% AM, press

7. Train the AGC by sending a continuous data stream for about 2 seconds. When it is

trained the AGC display shows “Good”, if not, it must be trained again. Once trained,

the AGC will remain at this setting indefinitely or until External Mode has been exited

and re-entered or AGC mode has been changed.

Your Notes:

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Ramsey Electronics SG560 Guía de usuario Pagina 49