LESSON 2.

MODEL 5345A OPERATION

ACCP Subcourse MM0462

Model

5345A

Frequency

Time

Measurement System

LESSON OBJECTIVE

Given supportive text and diagrams;

1.

Explain/demonstrate

operation

of the 5345A.

2.

Explain each of the operating

modes.

3.

Explain

operating

considera-

tions.

4.

Correctly answer all exercise

questions.

CREDIT HOURS

Two

TEXT

1.

DESCRIPTION

a. General.

The Model 5345A Electronic Counter (figure 1) is a

reciprocal counter capable of direct measurements from dc to 500 MHz. High

speed digital logic circuits are incorporated to give a true direct counting

and totalizing capability.

Frequency coverage can be extended to 18 GHz

with the use of the 10590A plug-in adapter and the Model 5257A Transfer

Oscillator. On the other end of the spectrum, the direct coupled amplifiers

allow frequencies as low as 50 uHz to be displayed full scale.

The instrument measures frequency, period, period average, single-shot

time interval, time interval average, and ratio.

It also provides a

totalize function, whereby two signals can be simultaneously totalized with

the displayed result being the sum of difference in the total number of

counts.

Both frequency and period are measured by measuring the total elapsed

time for an integral number of cycles of the input waveform. This results

in a direct readout of frequencies between 50 uHz - 500 MHz, and period

readouts from 2 nsec to 20,000 seconds.

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