vdoc

Chapter 8: B. Special Gages and Applications 75
Oscilloscopes
An oscilloscope is a piece of electronic test equipment that allows signals of voltage
to be displayed as a two-dimensional graph with voltage on the vertical axis
plotted as a function of time along the horizontal axis.
A typical oscilloscope is box-shaped with a visual screen, attached connectors,
and control knobs and buttons on the front panel. A grid is normally drawn
on the screen. Each square in the grid is known as a division.
One of the most common uses of the oscilloscope is to troubleshoot electronic
equipment by graphically displaying signals that indicate failure or malfunction.
Software engineers also use the oscilloscope to test software. This is probably
the only way to see if the software is running the electronics properly.
Multimeters
A multimeter is an electronic gage that combines more than one function in a single
unit. Multimeters use either analog or digital displays. Common uses for multimeters
are fault discovery, fieldwork of electronics or telecommunications technicians,
or as a basic workshop instrument. Standard measurements taken using a
multimeter include voltage, current, and resistance.
Part II.B.2
Pyrometers
A pyrometer is a noncontact measuring instrument that gauges an object’s temperature
by measuring its self-emission and emissivity.
Emissivity is displayed as a numerical value and does not have units. It measures
the object’s ability to emit electromagnetic radiation. The value of emissivity
ranges from zero to 1, where the emissivity of a perfect emitter, also known
as a black body, is 1. Theoretically, an object that does not emit radiation has zero
emissivity.
Pyrometers are used in a variety of applications. In medicine they are used
to monitor human body temperature. Other industrial applications include sheet
metal manufacturing and semiconductor manufacturing.
2. AUTOMATIC GAGING
Identify and describe basic components of
automatic gaging, such as machine vision,
ultrasonic, X-ray, laser, etc. (Comprehension)
Note: The use of these components is
covered under 3D1.
Body of Knowledge II.B.2