4. INTRODUCTION TO CRO
• Versatile electronic instrument giving visual
display of signals
• Used for measurement of frequency , amplitude,
• Also used in determining the nature and
characteristics of various components.
• Has a high bandwidth range thus making it a
sensitive and accurate device.
• Easier to use as the internal routine act as a
guide to the user.
• Hand-drawn oscillograms:
The earliest method of creating an image of a
waveform was through a laborious and painstaking process of
measuring the voltage or current of a spinning rotor at specific points
around the axis of the rotor, and noting the measurements taken with
The device which convert any electrical signal to
The graph, usually called the trace, is drawn by a beam of electrons striking
the phosphor coating of the screen making it emit light, usually green or blue.
This is similar to the way a television picture is produced.
27. WHY DUAL TRACE?
Unlike single trace oscilloscope , dual trace oscilloscope can display two traces
on the screen, allowing you to easily compare the input and output .
FOREXAMPLE: input and output of an amplifier.
30. Typical Applications:
Troubleshoot electrooptical and electrical systems.
Observe a triggered event separately or relative to the
Use with analog light meter output to visualize
intensity of a source.
Check response of a silicon, InGaAs, or avalanche photo
Analyze signals produced by function generators.
Evaluate system performance.