RAYTECH TR Mark III 250V Transformer Turns Ratio Meter

The TR-Mark III 250V is a three phase transformer turns ratio meter with a test voltage measurement range of up to 250V.

It offers new features and increased accuracy to make it a perfect system. A color LCD with a back light and a touch screen increases handling and user comfort. Two USB interfaces make it easy to store measurements on external storage devices, to transfer easily to a personal computer, or download nameplate data of the transformer to test.

Ease of use: This system is designed to be easily used and understood. Once the buttons and few menus are learned the system is very simple to understand and operate. This intelligent system analyzes the configuration of a transformer and performs all required measurements automatically for Voltage Ratio, Turns Ratio, Current, and Phase Displacement. The system can operate a full 3 phase testing sequence with a single push button operation. Connect the leads, Select the transformer configuration then press GO to test.

Impressive Accuracy: The TR-MARK III is a high precision, fully automatic, microprocessor based, Single and Three Phase Transformer Turns Ratio Test system. This system is designed for highly accurate readings on-site with laboratory precision. It is the most accurate system available.

Unique Measuring Technique: This newly designed technique of measurement incorporates a high precision dual-vector voltage meter for ratio readings and a rectification resolution circuit for phase displacement (vector group). The phase displacement (vector group) can be automatically detected and displayed without operator intervention.

Operation: The TR-MARK III first applies a small voltage on the HIGH winding side of the transformer and measures back through the LOW side of the transformer. Analysis is made and the system determines whether a test can be conducted. Then the system applies the test voltage on the HIGH winding side of the transformer and measures the voltage back through the LOW side of the transformer. This technique has been determined to be the safest possible method of ratio testing. The results are reported on the easy to read touch screen display.

Compact Design: The TR-MARK III is a lightweight system designed with its own rugged waterproof field case.

Simple Maintenance: There is no maintenance required. There is no calibration procedure (no potentiometers to turn). This is due to the utilization of high precision components in the design.

Advanced Protection: Upon powering on the system initializes itself with a self-calibrating, circuit checking sequence. If any problems are detected during this initialization period, or during operation, the operator is immediately notified. The system constantly monitors the condition of the transformer under test. The TR-MARK III can even recognize shorted leads and will terminate the test without any damage to the test equipment. This works especially well when test leads accidentally fall free from the transformer while under full voltage measurement. Accidental interchanging of the test leads on the High and Low voltage side are also detected and the measurement is safely halted.

Raytech TR-Mark III 250V Specification
Measurement Parameters
Range    Accuracy at
100V or 40V    Accuracy at
10V    Resolution
0.8 ... 2000    ±0.06% Rdg ±1 LSD    ±0.15% Rdg ±1 LSD    5 Digits
2001 ... 4000    ±0.1% Rdg ±1 LSD    ±0.3% Rdg ±1 LSD    5 Digits
4001 ... 13000    ±0.3% Rdg ±1 LSD    not specified    5 Digits
13001 ... 16000    ±0.4% Rdg ±1 LSD         5 Digits
Range    Accuracy at 250V         Resolution
0.8 ... 5000    ±0.06% Rdg ±1 LSD         5 Digits
5001 ... 10000    ±0.1% Rdg ±1 LSD         5 Digits
10001 ... 32500    ±0.3% Rdg ±1 LSD         5 Digits
32501 ... 40000    ±0.4% Rdg ±1 LSD         5 Digits
Current    Accuracy         Resolution
0 ... 1A    ±0.001A         0.1mA
Phase Angle    Accuracy         Resolution
±90 Degree    ±0.05 Degree         0.01 Degree
Turns ratio range    0.8 to 45'000
Temperature    Operating -10ºC to +60° C
Storage -20°C to +70°C
General Specification
Size    L: 490 mm (19.3”) W: 436 mm (17.2”) H: 177 mm (7”), Rack Unit: 4U
Rack Unit    4U
Weight    7.8 kg (17 lbs.)
Input Power    100 to 250 VAC 50/60 Hz auto ranging
Fuse    2AT
Test Voltage User Selectable    250, 100, 40, 10, and 1VAC
Max test current    1A
Panel Display    Color LCD with back lighting and touch screen
Front Panel Sealed    Anodized
Interfaces    4 USB 2.0 full speed (3 host, 1 device) and 9 Pin RS232 serial
Memory Storage    Internally stores more than 10 000 test results
Temperature Operating    –10°C to +60°C, Storage –20°C to +70°C

What's In The Box
Complete cable sets (H and X lead cable 2 x 5m, extension cables 2 x 10m and power cord)
Cable carrying bag 
Instruction manual
Software for data download