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Watthour Meter Principles 2 - Instant Video



This 31-minute video explains why a meter disk turns in proportion to the power being used. The theory and functions of electro-mechanical meter compensations and adjustments are also discussed.

Training Sessions
Meter Design Characteristics – 4 minutes

Identifies basic operating principles and design characteristics that relate directly to a meter’s accuracy. Defines design speed and disk constant and explains how design speed is related to a meter’s accuracy. Describes how meter manufacturers control a meter’s design speed.

Overload Compensation – 6 minutes
Identifies four compensations used to maintain watthour meter accuracy. Explains why an uncompensated meter will run slow in an overload condition. Describes how a watthour meter can be compensated during overload condition by an overload plate.

Voltage, Temperature, and Frequency Compensations – 8 minutes
Describes voltage compensation. Describes temperature compensation. States why variations in a system’s frequency are not a major concern.

Full Load Adjustment – 6 minutes
Identifies three common watthour meter adjustments. Explains why a full load adjustment may be needed to maintain a meter’s accuracy. Describes three ways in which a full load adjustment can be made.

Light Load and Power Factor Adjustments – 7 minutes
Explains why a light load adjustment may be needed to maintain a meter’s accuracy. Describes how a light load adjustment can be made. Explains why a power factor adjustment might be needed and how it can be made.

Item Code: WP2-IV

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