| 摘要 |
The electrical measuring device consists of a housing (1) and an exchangeable test mandrel (10). A measuring transducer (2) is installed in the housing (1) and a measuring arm which is loaded by a spring (9) is rotatably mounted in said housing. The measuring arm projects into a recess of the test mandrel (10) and supports at its end a probe (7) which bears against the inner wall of the bore. The test mandrel is provided with four fixed stops (11) for centring. The measuring arm has two unequally long levers (a and b) for the purpose of standardising the transmission coefficient. Additional press-on elements (12) ease the centring. A push button (13) allows the probe (7) to be retracted. <IMAGE>
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