Electrical Projects Although the VOM has the capability of measuring line voltage, there are several disadvantages to its use which can be avoided by using a regular line-voltage monitor. Accuracy is the most significant of these disadvantages from a troubleshooting viewpoint. Most VOMs in the price range practical for the home repairman have an accuracy of ±5% of the center-scale reading (usually 120V). This means a reading is accurate to within 12V on this scale. For the line-voltage monitor accuracy is guaranteed to within 2% of the center-scale reading. In addition to this greater accuracy, the line-voltage monitor can provide a continuous indication of line voltage without having to use test probes, scale settings, etc. to obtain it. A further convenience is the large, easily read scale. Provided with a standard three-prong receptacle on the side of the meter case, this monitor connects an appliance quickly to the line without requiring an additional test outlet.

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October 6, 2008