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MT-1/WT3 User Guide
Chapter 2
Description
The first part of this chapter describes the MT-1/WT3 socket. The second part
explains the theory of operation for the tester.
MT-1/WT3 Socket
The MT-1/WT3 socket is cylinder-shaped, designed to be easily inserted in both
ringless and ring-type meter bases. A latch with a quick release mechanism is
available as an option for ring-type meter bases.
The socket contains three 50A synthesized AC current sources to simulate resistive
and reactive loads, a high accuracy three-phase electronic standard and a WiFi
communication controller.
The rear of the socket has six standard fixed tabs with bypasses and two removable
twist tabs, with twist-and-lock mechanism. The socket gets its power directly from
these back tabs and accepts an input voltage from 100 to 600VAC.
The twist tabs can be placed at the 3, 5, 6 or 9 o'clock position as required by the
meter base where the test is being conducted. The twist tab at 3 o'clock can be
inserted at two different positions to hold either forms 6S, 8S, 9S or form 4S. The
twist tab at 9 o'clock can be inserted at two different positions to hold either forms
6S, 8S, 9S or forms 3S, 4S, 12S. One of the twist tabs can be placed at the 5 o'clock
position for some 3S or 12S meter bases or at the 6 o'clock position for 14S, 15S, 16S
meter bases. See Appendix C for all twist tab configurations.
The front of the socket has seven jaws and five spring-loaded contact pistons. The
pistons are actuated by the meter's middle lugs. A spring contact at the 6 o'clock
position is also provided for 12S meters. The meter under test is entirely controlled
by the socket. No setup wiring is needed.
The socket has a dead-front design for safer operation. The front jaws of the socket
only become live when a meter is inserted. See Appendix A for all technical
specifications.
Page • 9
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