Agilent Technologies 54657A Podręcznik Użytkownika Pobierz pdf (Strona 61)

The following procedure can be used to setup a mask template for testing the

frequency of a sine wave or a square wave. Similar methods can be used to

generate masks for testing the frequency of signals of other shapes.

In the oscilloscope setup, the vertical sensitivity and position should be

adjusted so that the amplitude is almost full scale. The trigger level should

be adjusted to the middle of the input signal. The mask template can be

created by using a function generator to generate a signal of variable

frequency but of similar shape and amplitude to the one that is going to be

tested.

Connect the output of a function generator to the oscilloscope.

2 Set the function generator to generate a waveform with a similar

shape to the one that you are going to test.

3 Adjust the amplitude of the output until it is similar to the signal that

you are going to test.

4 Press Time on the oscilloscope, then press the Freq softkey to

turn on the automatic measurement for frequency.

5 Adjust the frequency of the output of the function generator to the

lower test limit.

The frequency can be verified by the automatic measurement.

Press Autostore .

7 Adjust the frequency of the output of the function generator to the upper test

limit.

An envelope of the test limit is generated.

Create a mask in the Define Automask menu with a tolerance of 0.0%.

For more information, refer to "To Create a Mask Template Using Autostore"

in this chapter.

Specify your test region in the Mask Editor menu.

Operating the Measurement/Storage Module

Creating a frequency testing mask

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Agilent Technologies 54657A Podręcznik Użytkownika Strona 61