A.C. Coupled Distortion Example
- Here we take a look at what happens when we view
a low frequency signal using both A.C. and D.C. Coupling.
- In this case the signal is a square wave and has
a frequency of 50Hz and an amplitude of 5Vpp. Which
implies that the Time
Base is set to 10mS/div and the Vertical Gain
is set to 1Volt/div.
- Below we can see the diagrams on the left side of
the table the upper signal is the input viewed eith the
CRO set to D.C. mode. While below that we see the same
signal distorted due to A.C. coupling.
- Here we have the input signal a 5Vpp
square wave which is D.C coupled. (i.e the Mode Selector
has been set to the D.C. position).
- As is expected the signal is not
distorted in any way.
- Here we have the same signal except it is
A.C. coupled (i.e the
Mode Selector is set to A.C.
- Due to the capacitor that is connected to
the input when we use A.C. coupling, the signal
has been distorted a great deal as can be seen
ALWAYS use the CRO with the Mode Selector set
to D.C. unless an A.C. setting is absolutely necessary.
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Revised: 15 September 2004