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Portable 3-Phase Watthour Meter Tester
SKU: WT1 Category:



Portable 3-Phase Watthour Meter Tester

The MT-1/NT3 is an ideal tool for field-testing and periodic sampling of self-contained meters. No setup wiring is needed. A complete test is done within a few minutes!


The MT-1/NT3 can be set to test all 3 phases simultaneously in one step or set to do a full test consisting of the 3 phases simultaneously followed by each element separately.

Self-Contained Meters

An ideal testing solution for self-contained meters, the MT-1/NT3 also has reverse flow testing capability for net metering installations.


Uncompromised accuracy

Three built-in 50A current synthesizers (phantom load) simulate active and reactive load.

Its built-in single-phase Wh/VARh standard will offer you a typical NIST traceable accuracy of ±0.02%.

Easy Setup

Fast setup with no wiring and a dead-front design means your operation is quicker and safer.

Setting-up your test has never been easier.

Technical Specifications

Compatible Meters
Single-Phase 1S, 2S, 12S, 14S, 15S and 16S
Class 100, 200, 320
Test Socket
Input Voltage 100 – 600VAC
Line Frequency 58 – 62Hz
Power Consumption 75VA (maximum)
Circuit Breakers 3 x 1A (press-to-reset mechanism)
Current Synthesizers
Adjustable Current 1 to 50A
Phase Angle (Wh) Unity and 60° Lag
internal 3-phase Watthour Standard
Typical Accuracy ±0.02%
Guaranteed Accuracy ±0.05%
Operation Temperature -4° to 140°F (-20° to 60°C)
Storage Temperature -4° to 140°F (-20° to 60°C)
Physical Dimensions
Test Socket (Diam. x L) 6.9” x 7.7”
Remote Control 8.3” x 3.9” x 1″
Carrying Bag 11″ x 11″ x 8″
Test Socket 5.7 lb
Remote Control 0.6 lb
Carrying Bag 8.7 lb
Parts and Labor 2-years limited***
Carrying bag Update cable
User’s manual WTDataOne Software
Quick Start Guide 2 Removable Twist Tabs
Calibration report Remote Control

***Only applicable to units shipped to Canada or USA. 1-year warranty for other countries.

Often used with these accessories