At the time when there were no read-out control devices it was clearly much more important. Nowadays, it is used where the built in control device can't reach, or where the decisive values are not available. Because of it's price alone, the range of it's functions is wider than that of the multimeter, although the small hand-held oscilloscope, as far as speed and handling is concerned, is close on it's heels when it comes to measuring fast current flow.
Shown above is a multi-purpose, free-standing model, suitable for all makes of vehicles. This particular model has all the obligatory equipment necessary for measuring the Diesel- (clouding) and the petrol exhaust fumes (CO, HC, NOX, O2), and was one of the first devices to gather the values and display them on a monitor. Newer devices are more compatible with the world of PCs. The values can be fed into an Intranet (company internal network) from where they can be analysed by any or all the users. Of course, this tester can manage all the tasks that a multimeter can as well. Whereby, it can show the values either as large numbers or also as a graphic. It's operation and features, have been simplified for the use in the workshop. Due to this, it's possibilities, as opposed to (cheaper) oscilloscopes for electro-technicians, are noticably more limited. The monitor however, is larger. The particular advantages of these devices were previously to be found in the analysis of ignition defects. Hereby, the primary- and secondary image could be called up and evaluated. In this case, due to the possibility of a number of defective components and also engine defects (e.g., lack of compression) which had to be taken into consideration, these oscillograms could give quick advice. Nowadays, these procedures are more applied to the sensors, and only then, when the error-readout and the readings from the control device are not really helpful. 11/10
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