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Figure D.18 Final logic probe circuit with single shots to detect logic-level switching.
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APPENDIX D
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X Sweep Generator Electron Beam
Figure D.19 The basic circuitry of an oscilloscope is actually quite simple.
OSCILLOSCOPES
There are two different types of oscilloscopes. The most basic one is the analog oscilloscope that starts a sweep generator when a voltage trigger level is reached. The sweep generator causes a cathode-ray tube electron beam to move across the screen. The continuing signal is drawn on the circuit screen, de ected up and down proportionately to the voltage of the input signal. This operation is shown in Fig. D.19. The circuit screen is marked off in gradicules, which indicate the time between features on the screen and their magnitudes. The oscilloscope itself is calibrated so that these values can be read off the screen simply by counting the gradicules. Multiple signals can be displayed by alternating the position of the single electron beam. One way is to alternate the source displayed each time the oscilloscope is triggered. The second method is to change which source is being displayed as the beam sweeps (this is known as chop). Figure D.20 shows how these methods work and appear on an oscilloscope display. Neither method is perfect for looking at multiple signals, and in either case, important data could be lost or not visible. There are two problems with the analog oscilloscope when it comes to working with PIC microcontroller (and other digital) circuits. The rst is that each time the electron beam sweeps, the signal on the display is very dim and fades quickly. If the intensity is turned up, the phosphors on the backside of the CRT could be damaged. The second problem is that it is very easy to miss single events in multiple sources
Sources
ALT
CHOP
Inactive Display
Active Display
"Broken" Display
Figure D.20 When displaying multiple traces on an oscilloscope screen, they are either displayed alternatively or the display alternates between them.
MISCELLANEOUS ELECTRONIC REFERENCE INFORMATION
because the alt and chop displays miss the changes. These problems get worse with faster sweep speeds and multiple signals. Over the years, some manufacturers have come up with ways to store signals and improve phosphor performance, but still there are lot of problems working with an analog oscilloscope with digital signals. Analog oscilloscopes are excellent for very low-speed, repeating signals, such as you would nd in your stereo with a reference signal, but they will not be helpful for digital signals. Instead of using analog oscilloscope for digital applications, I would recommend using a digital oscilloscope, more properly known as a digital storage oscilloscope (DSO) or digitizer. These oscilloscopes save incoming signal values digitally and display them in a similar format as an oscilloscope. The block diagram for a digital oscilloscope is shown in Fig. D.21. In this circuit, the incoming circuit is digitized by the Flash ADC and stored into memory. When the triggered event has nished, the data is read from memory and displayed on the oscilloscope s display. The obvious advantage of a digital oscilloscope is its ability to capture and display an event s multiple signals without any data being lost or dif cult to observe. There is also the added advantage of being able to transfer the data from the digital oscilloscope to a PC without having to take a picture of the screen and then digitize it (as you would with an analog oscilloscope). The oscilloscope pictures shown in this book were transferred via RS-232 from my TDS-210 oscilloscope and stored into TIFF format les for publishing. Events also can be displayed more easily on a digital oscilloscope because many models have the capability to sample continuously, and then when the trigger point is reached, the counter just continues to the end of the sample. This is shown as throughout this book with the various oscilloscope pictures that are presented.
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