LESSON 1.
ELECTRONIC COUNTER FUNDAMENTALS
ACCP Subcourse MM0462
Model 5345A Frequency Time
Measurement System
LESSON OBJECTIVE
Given supportive text and diagrams;
1.
Explain
the
purpose
of
electronic counters.
2.
Explain the difference between
period and frequency measurement.
3.
Explain the purpose of each
major circuit comprising a counter.
4. Explain the different types of
measurements made with a counter.
5.
Correctly answer all exercise
questions.
CREDIT HOURS
Two
TEXT
While the oscilloscope is a very widely used instrument for
observation of waveforms, its use as a device for measurement of frequency
has the inherent limitation of approximately 3% accuracy.
On the other
hand, a typical frequency counter exhibits accuracies on the order of .001
parts per million (PPM).
Electronic counters are considered to be the most accurate,
convenient, and flexible of all the available instruments for making
frequency and time interval measurements.
They cover a wide variety of
features allowing measurement of frequencies from dc to 40 GHz and time
intervals from 10 nanoseconds to more than 100 days.
An electronic counter is used for the comparison of an unknown
frequency or time interval with a known frequency or known time interval.
The counter's logic is designed to present this information in an easy to
read numerical display. The accuracy of the measurement depends, to a great
extent, on the stability of the known frequency. This known
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