Ramsey Electronics SG560 Guide de l'utilisateur télécharger pdf (Page 15)

DETAILED INFORMATION

Signal Descriptions:

TP1 is the SG560 direct output; note the flat line vs. frequency.

TP2 is the correct filter output as expected of a properly input and output matched filter.

TP3 is the frequency response of the lower filter when no matching or an incorrect matching

resistor is used while testing the circuit. Note the difference between TP2 and TP3. Not only

is the level 6 dB higher here in the pass band (since there is no voltage divider), it also has an

additional “bump” that is unexpected from the filter design. This is due to the complex im-

pedance of the filter reacting with the ideal source of the SG560. This is not a desirable re-

sponse.

TP4 is what would be seen at the output jacks of a generator with a 330 ohm output imped-

ance.

TP1

TP3

TP4

TP2

FREQUENCY

AMPLITUDE IN DB

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Ramsey Electronics SG560 Guide de l'utilisateur Page 15