Can I use it whitout accessories? How many accessories can I use with?

Can I use it whitout accessories? How many accessories can I use with?

Yes, it can work without any accessories, depending on the test you wish to perform on the site.  The only test that it is not available without accessories would be the primary/secondary analysis (Ratio Test).   

The accessories available are 3 phases Rogowski coils rated at 2500A max (ST-3/FLEX-CT2500), Voltage Transducer rated at 600 Volts max (ST-3/PT600), and two interface adapters to use with the SensorLink® Amp LiteWire (ST-3/ALW) and Volt LiteWire (ST-3/VLW) for overhead (pole mounted) installations. 

The accessories are 15 ft long. Cable extensions are available for purchase. The extension cable is used when the primary CT or PT is far from the meter installation.

They are compatible with ST-3/FLEX-CT2500 and ST-3/PT600 accessory. 

When using one of these extensions on primary current or primary voltage accessory previously described, the performance of the accessory will be derated. 


The table below shows which installed accessory is needed or not for the supported tests. 

Power Quality 
CT Ratio/Phase
PT Ratio/Phase
CT Secondary Burden 
CT Accessory 
Not necessary
Not necessary
Not necessary 
PT Accessory 
Not necessary 
Not necessary
Not necessary 
Not necessary 

Spec Sheet: Download PDF
Manuel: Download PDF
Connection Guideline: Download PDF

Introduction Video: Watch Tutorial
ST-3/XT3 Overview: Watch Overview

    • Related Articles

    • How does the ST-3/XT3 works?

      ST-3/XT3 : Transformer Rated Wireless Site Tester This unit is a socket type tester, that obtains the reading directly from the secondary of the current and potential transformers. It does not require any external load to perform tests and it is ...
    • What is the procedure when installing the tester?

      The ST-3/XT3 is compatible with CT rated installations forms 3S, 4S, 6S, 8S and 9S, it is also compatible with installation forms 5S, 35S and 45S using the included adapter. Before testing a CT rated installation in the field, always make sure that ...
    • Are all accessories compatible with all tester models?

      Most accessories are compatible with all models. You can use older accessories with new tester models. If you own 20-25 years old accessories, some might not be compatible with the new generation models (i.e. pulse pickup PW-9071), but all new ...
    • Does any of the meter tester come with accessories?

      The WT comes in a shock resistant carrying bag. The bag has individual compartments for the test socket, the pickups and the Users Guide. There is also enough space for small accessories such as the magnetic adapter for the optical pickup, seals, ...
    • Can I use in on a 5S installations?

      Yes. In order to use the ST-3/XT3 on a 5S, 35S or 45S installation, you must use the 5S, 35S and 45S adapter which is included when you purchase a ST-3/XT3. Useful links: Product ...