Scope Triggering

COMPONENTS USED TO SELECT SCOPE TRIGGERING

The TRIG MODE section in the figure below allows for automatic scope triggering or normal triggering. In AUTO (automatic), the activation will be free-running in the absence of a proper initiation input or will activate on the input signal at frequencies above 20 hertz. In NORM (normal), the vertical channel input will start the sweep.

Components to select triggering.

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COMPONENTS USED TO SELECT HORIZONTAL-DEFLECTION MODE

For the present, notice only that the HORIZ DISPLAY (horizontal display) in the figure below can be controlled by the TIME/DIV switch. Other switches in this section will be explained later in this chapter.

Components to select mode of horizontal deflection.

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COMPONENTS USED TO CALIBRATE THE PROBE OF THE SCOPE

In the next figure below, you can see the components used to calibrate the test probe on the scope. A 1-volt, 2-kilohertz square wave signal is provided for you to adjust the probe for an accurate square wave and to check the vertical gain of the scope. You adjust the probe with a screwdriver, as shown in the figure.

Components to calibrate probe.

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SIMILARITIES AMONG OSCILLOSCOPES

The oscilloscope you use may differ in some respects from the one just covered. Controls and circuits may be identified by different names. Many of the circuits will be designed differently. However, all the functions will be fundamentally the same. Before using an oscilloscope, you should carefully study the operator’s manual that comes with it.

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