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SERVICES
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![]() The AP-20 System Accurate Phase Identification. . . Anywhere. Avistar's AP-20 phase measurement system is a fast, easy-to-use tool for identifying phase and phase angle anywhere on your power system. Featuring complete one-person operation, immediate phase identification, and powerful features for remote work and GIS system-map integration, the AP-20 is by far the most capable tool in its class. Click on any of the links below for additional information: Features and Benefits:
Common uses include:
AP-20 Users include:
Operational Description: The AP-20 consists of a Reference Unit, Field Unit, and Hotstick Unit. The Reference Unit typically installs at a substation, plugged into a reference phase via a standard wall outlet. Using GPS broadcasts for timing information, it continuously records the exact times of the voltage zero-crossings. The Field Unit and Hotstick Unit go to the job site. The Field Unit receives readings via FM wireless from the Hotstick Unit and, like the Reference Unit, uses GPS as a timing reference. The system compares the GPS time stamps at the test point with those at the reference location and uses this information to determine the phase angle at the Hotstick Unit's point of contact. Once the phase and phase angle are identified, the Field Unit displays them visibly and audibly. This is within seconds while within cell-service range. Outside of cell-service range, the Field Unit stores 100 readings for as long as 4 days, then automatically resolves and displays them for you as soon as you return to cell-service range.
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