Dealing With Small Signal Levels And Noise - Ramsey Electronics SG560 User Manual

DETAILED INFORMATION

Dealing with Small Signal Levels and Noise:

If small signal levels are needed for a test setup and the output noise of the SG560 is too
high, an attenuator on the output of the SG560 will scale the signal level and the noise down
to an acceptable level. The output could be limited with a resistor divider circuit as well, but it
may be desirable to use a balanced attenuator that will attenuate both the positive and nega-
tive outputs equally to keep noise to a minimum.
Use the following circuit for a divide by ten attenuator. When using this circuit all of you volt-
age and offset settings will be divided by 10, using an even number makes it easy to adjust
and read values. This will supply an output range of 0.0V to 1.0V with a max offset of 0.5V
and a 10 ohm output impedance.
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For a factor of 100, a larger divider is needed. This will supply a range from 0.0 to greater
than 0.1volts out with a maximum offset of 0.05V, and an output impedance of 10 ohms.
Note all resistors are 1% values.
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