Digital scope display of a 1 khz sine wave from a function generator. Bandwidth, as a banner specification, tells you something about how well. I really wanted you guys to know about the picoscope waveform library and in this video i show where i am using it to identify a jumped timing belt on a 2006 vw passat. The iatn waveform library or automotive waveform database, available only to premium members, allows easy searching of thousands of automotive scope waveforms, obdi and obdii scan data, component photos, automotive waveform videos, scantool snapshot videos and other vehiclespecific images that have been uploaded and discussed on iatn.
For a scope with a bandwidth above 1 ghz, or if you need one for special purpose testing. Oscilloscope fundamentals case school of engineering. For a scope with a bandwidth above 1 ghz, or if you need one for specialpurpose testing. Beyond general purpose signal analysis, most engineers are also interested. The trigger makes repetitive waveforms appear static on the oscilloscope display by. With the scope set in the triggered mode, you may not see the spike. After the scope has triggered, analyze or save the captured waveform. Zooming in on the camshaft waveform, it soon became clear there was an. Some scopes will convert the voltage scale to kv when the ignition probe is. Where to get known good lab scope waveforms scannerdanner.
The waveform library browser enables you to search a global database of waveforms uploaded by picoscope users from around the world, and contribute yours to share with others picoscope automotive 6. Secondary waveform the condition of the coil, the coil lead to the distributor, the distributor cap and rotor, the spark plug leads and the plugs. Picoscope automotive includes a fantastic feature that allows the pico community to benefit from each others experiences. There are several ways to navigate this interactive pdf document. Picoscope waveform library for sharing and cloud storage. A digital oscilloscope acquires a waveform by conditioning the input signal in the. Reference waveform notes air flow meter air vane the voltage output from the internal track of the air flow meter afm should be linear to flap movement. As you progress through the training program, you will learn picoscope from our guided tests through to our more.
Here youll learn all the setting commonly found on automotive scopes. At this point, it is worth reminding ourselves what a waveform is. Standard reports include a predefined set of signals such as wordline, bitline, sourceline, pwell, etc. The automotive digital multimeter dmm when correctly. Basic waveform analysis with an oscilloscope september, 2016 by mark hughes in this first part of a multipart series, we will use a tek mdo mixed domain oscilloscope to illustrate options to measure various circuit elements. The rapid growth of technology used in cars has highlighted the need for a piece of diagnostic equipment that will give you xray vision, and show you the heartbeat of a vehicles electrical and electronic system. Over the following pages, you will find a summary of picoscope and what it can do. The manual provided with your oscilloscope will give you more specific. Oscilloscope diagnostics using picoscope software pico technologys advanced diagnostics software is always on hand to help you, no matter what your experience of capturing component waveforms is. You also can select a single cylinder and separate it from a superimposed pattern to look at individual cylinder details. When you observe a negative spike in the waveforms, the ignition coil is the most likely cause. You can check many of the vital signs of these components by looking at the highvoltage secondary waveform.
A study of primary scope pattern analysis dynamic auto test corp. R e ef ferreennccee wwaavvefoorrmm lliibbrraarryy menu abs sensor waveforms. In this chapter we go through the fundamentals of a. This simple graph can tell you many things about a signal, such as. You should be able to deduce the meaning of these indicators.
The following exercise will explore making manual waveform measurements. Basic waveform analysis with an oscilloscope technical. Introduction coil on plug is a concept where each spark plug is ignited by its. Picoscope fundamentals ignition waveform analysis youtube. Below are the links to the rest of this series on sd premium. The oscilloscope or scope will give you a picture view of all electrical waveforms, regardless of vehicle brand or year. But that highvoltage waveform also is affected by combustion inside the cylinder. This document oscilloscope diagnostics, a picoscope guide is step 1 in a 5 step training program that we have developed to guide those new to picoscope along their journey of scope diagnostics, from the very beginning. Oscilloscope diagnostics picoscope automotive lab scopes and. Not only is the secondary scope hookup in coilonplug application in most cases time consuming, but the inconsistency of a capacitive pickup in the proximity of a coil winding on each coil, can be deceiving. Understanding oscilloscope bandwidth, rise time and signal fidelity.
Where to get known good lab scope waveforms print this is an excerpt from a case study i did on sd premium. Since the current flowing through the winding makes the resistance for the voltage drop, it mirrors the primary ignition coil waveform made with an inductive amperage clamp lower pane of fig. Picoscope fundamentals ignition waveform analysis spelunkerd. Scoping and interpreting secondary ignition waveforms. Pico scope airflow mass meter menu airflowmass meter range rover 3.