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PCG10 / K8016
Circuit Analyzer as a Bode Plotter
Bode Plotter enables you to evaluate the frequency response of devices such
as amplifiers and filters.
The frequency response is a representation of the device's output response
to sinusoidal input voltage at varying frequencies. The device under test is
connected between the signal output of the function generator (PCG10 or
K8016) and the CH1 input of the oscilloscope (PCS500, PCS100 or K8031).
The function generator automatically steps a sine wave over a specified
frequency range and the oscilloscope measures the output voltage of the
device under test at each step. These readings are plotted to the frequency
response curve on the screen.
Operation of the Bode Plotter
Assume that you want to measure the frequency response of an amplifier.
•
Connect the function generator signal output to the input of the amplifier.
•
Set proper output voltage to the generator (e.g. 1Vpp).
•
Connect the output of the amplifier to CH1 input of the oscilloscope.
•
Click oscilloscope's Run button and adjust the Y position until the trace is
in the middle of the screen.
Make following selections on the Bode Plotter interface:
•
Select proper Frequency Range
•
Select proper Frequency Start
•
Click the Start button
The frequency response graph will be plotted on the screen.
You can take a look to the oscilloscope display to see the a mplifier output
waveform.
If the graph is too low position or partly out of the display area change the V
Range (or oscilloscope's Volts/div setting), so that the graph is at the desired
vertical position on the screen and click the Start button again.
You can afterwards change the display mode, frequency scale and the
voltage scale (V Range) to survey the details of the graph.
Note: Pay careful attention to the input and output signal levels of the amplifier
to get correct test results. PCG10 and K8016 generators can output 0.1V to
10V peak-to-peak signal. If high sensitivity phono inputs are being tested, an
extra voltage divider (potentiometer) should be used to connect the signal to
the amplifier input.
The maximum signal amplitude that can be plotted to the graph is 10Vrms.
Use the probe's attenuator position x10 or some other means to bring the
maximum expected level below 10Vrms.
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