GW Instek GFG-8200A Series User Manual

Page 13

FUNCTION GENERATOR-SERIES

INSTRUCTION MANUAL

6. APPLICATION NOTE

This section describes the application of the Function Generators in

details as well as a brief description relating to the block diagram. Only for

the essential application method.

(A) Trouble-shooting using signal-tracing method.

This method is similar to signal replacing way. The signal of model

will be fixedly sent to input terminal. Observing its signal wave on the

oscilloscope from front stage to rear stage orderly until appear a signal

with normal input but with abnormal output.

(B) Use as bias source and signal source circuit.

Utilize the Figure 4 of connecting type, which can provide bias of a

transistor and signal input. The output waveform can be observed from

oscilloscope. Adjust to the best condition with output max. amplitude

and no distortion. Adjust DC OFFSET to see the different effect of

different bias condition.

The Sine wave input will be different from output the overload point.

Using Triangle wave will easily observe the display of oscilloscope. It

can decide the linear range of output waveform. And the largest no-

distortion output amplitude.

FUNCTION GENERATOR-SERIES

INSTRUCTION MANUAL

(D) Using the Square wave test the characteristics of amplifier circuit.

It can’t actually explain the transient response of amplifier by using

Sine wave for the frequency response curve observation, but using the

high order poly-wave, Square wave, instead to display its waveform

from the oscilloscope can show up many characteristics of amplifier.

(a) Using the circuit of figure 5, the 50 Ω connector trim the

oscillation effect of Square wave.

(b) Use the output of Triangle wave, adjust the amplitude until there

are no clipping happened in the applied frequency.

form of middle of amplifier pass band, like 20Hz, 1kHz, 10kHz

and etc.

(d) The output waveform of (c), must get something with frequency

Figure 6 shows some possible conditions.

CAUTION: The composed poly-wave frequency of

Square wave is quite large, so it’s not suitable for the

narrow band amplifier testing.

(E) Test of logic circuit

This equipment is suitable for logic circuit testing. Using Square or

Pulse wave can analyze or watch the frequency waveform of a

designed testing circuit. Also the DC Offset effect, drive the plug-in

model board or logic circuit trouble-shooting and etc. Used as signal

tracing and signal replacing operation: