IET Labs 1433 Series User And Service Manual

Contents

IET Labs 1433 Series User And Service Manual Manual pdf 13 page image

71433 SeriesOperation3.2.4 Thermal emf ConsiderationsThe highest-quality low-emf components are usedin the 1433 Series. There nevertheless may be someminute thermal emf generated at the test leads wherethey contact the gold-plated binding posts.This emf will not manifest itself if an ac measurementinstrument is employed. It will also be eliminatedif a meter with a “True Ohm” capability is used.Otherwise it may appear as a false component of thedc resistance measurement. It is possible to eliminatethis component of the reading error by taking a secondmeasurement with the leads reversed and averagingthe readings.3.3 Dial SettingWhenever the dials are used in positions 0-9, theresulting resistance is read directly. The decimalpoint and the steps are clearly marked on the panel.For additional flexibility and range, each decadeprovides a “10” position setting. This “10” positionon any one decade equals the “1” position on the nexthigher decade. It adds about 11% to the nominal totaldecade resistance.To determine the resistance obtained when one ormore “10” settings are used, simply add “1” to thenext higher decade. For example, a setting of 3-6-10-0-10 Ω becomes: TOT 3 7 0 1 0and a setting of 10-10-10-l0-10.10 Ω becomes:10 1 0 0 0 0 0.010 1 0 0 0 0.010 1 0 0 0.010 1 0 0.010 1 0.0.10 1.0TOT 1 1 1 1 1 1.0

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