METER TESTING

The PowerMaster 7 Series, 5 Series and 4 Series field instruments are all capable of testing meters.

The PowerMaster offers three methods for testing meters in the field:

1) Customer Load - checks the accuracy of the meter under its normal operating (billing) conditions. This is a very important test as it judges how the meter functions under real world conditions. These conditions include (but are not limited to) harmonics, imbalanced loads, varying loads and extreme power factors.  The PowerMaster 7 Series and 5 Series offer this functionality.

2) Phantom Load (controlled current source) - checks the accuracy of the meter using a controlled sinusoidal current source and customer site voltages. This test is ANSI compliant, and the normal testing points are Full Load (FL), Power Factor (PF) and Light Load (LL). Both the 7 Series and 5 Series offer a true three phase current source option and can test for Watthours, VARhours and VAhours using delivered or received current flow.  The 4 Series tests meters under series / parallel conditions utilizing its current source and site voltage.

3) Phantom Load (controlled current & voltage source) - checks the accuracy of the meter using a controlled sinusoidal current and voltage source. This test is ANSI compliant, and the normal testing points are Full Load (FL), Power Factor (PF) and Light Load (LL). This test replicates a normal laboratory testing scenario in which the meter will be totally isolated from all site voltages and currents. The 7 Series offers a true three phase current source and voltage source option and can test for Watthours, VARhours and VAhours using delivered or received current flow.