Analog_vs_Digital_Meters

Caution analog ohmmeters may apply a higher voltage

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: e internal battery. CAUTION: Analog ohmmeters may apply a higher voltage to a circuit than a digital ohmmeter, causing damage to solid state components. Use analog ohmmeters with care. Digital meters, on the other hand, apply less voltage to a circuit, so damage is less likely. Many analog ohmmeters will, when switched to the ohm function, reverse the polarity of the test leads. In other words, the red lead may become negative and the black lead may become positive. The meter will function properly as long as you are aware of this and reverse the leads. This is especially important when working with diodes or transistors which are polarity sensitive and only allow current to flow from the positive to the negative end. To check for polarity reversal, set the ohmmeter in ohm function and connect its leads to the leads of a voltmeter (red to red, black to black). If the voltmeter shows a negative value, that particular ohmmeter reverses polarity in ohm function. Most digital meters do not...
View Full Document

Ask a homework question - tutors are online