The Psychology of Quality and More |
A Toolbook for Quality Improvement and Problem Solving (contents) |
Histogram: ExamplesThe Quality Toolbook > Histogram > Examples When to use it | How to understand it | Example | How to use it | Practical variations
ExampleA power engineer required a 10 ohm, 0.1% tolerance, high power resistor. The only resistors available were 10% tolerance. To achieve the higher tolerance, he uses a series of 100 resistors each of 0.1 ohm. The summing effect was expected to average out the low tolerance, as resistors over and under 0.1 ohm balanced each other out. When the resulting resistance started overheating, the engineer measured the value of each one and plotted a Histogram, as in Fig. 1. The result showed that although the resistors were within specification, their distribution was not normal and not centered on 0.1 ohm (this was probably caused by selection from an off-center production system). The solution of a specially made resistor was significantly more expensive.
Fig. 1. Histogram shows selected sample
Other examples
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