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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 functioning theory of 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 obtains its power directly from
these back tabs and accepts an input voltage from 100 to 600VAC.
The twist-tabs can be placed at 3, 5, 6 and 9 o'clock position as required by the meter
base where the test is 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-tab can be positioned at 5 o'clock for some 3S or
12S meter bases or positioned at 6 o'clock 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 middle lugs of the meter. A spring contact at 6 o'clock 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
become live only when a meter is inserted. See Appendix A for all technical
specifications.
Page • 9
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