Harmonic Clamp Meter

                Home > Products > DC/AC Harmonic Clamp Meter > Transformer Turns Ratio Meter
                PROVA 1660

                Transformer Turns Ratio Meter

                Product Features
                • Measurements of 1Φand 3ΦTransformer/VT/CT Turns Ratio.
                • VT/PT ratio 0.8~10000, CT ratio 0.8~2000.
                • Graphical and Literal Illustration of Measurements and Connections with Large Back-lighted Dot Matrix 240 x 128 LCD. Display Test Data with Nameplate Transformer Values for Easy Interpretation.
                • Ten Test Frequencies (50~400Hz).
                • Display Turns Ratio, Deviation, Secondary Output, Excitation Voltage and Current, Phase Angle and Nameplate Transformer/VT/CT Values in one page for easy transformer quality interpretation.
                • Check for Live Test Points, Short Circuit, Open Circuit, and Reverse Polarity before Each Measurement. Message is displayed to Warn Users (But, checking is not performed once measurement starts).
                • Store 4096 Files of Transformer Nameplate Values (VT/PT/CT, 1Φ/3Φ, Test Frequency, Primary and Secondary Voltages or Ratio, RCF) and Measuring Data.
                • 9 types of 3Φ Windings Connections pre-installed for easy user selection.
                • Wireless Blue Tooth Communication with PC.
                • Select Filter to Remove Field Noise (Slow, Normal, Fast).
                • Disable or Enable Auto-Power-Off with Programmable Time.
                • Built-in calendar clock.
                  Records with Date and Time Stamp.
                • Powerful Lithium Battery (3400mAH) with built-in Charging Circuit.
                • User Programmable RCF (Reference Correction Factor, 0.99~1.01) to Correct Accuracy within 1% Error.
                • Friendly File System for Easy On-site Data Retrieval and Nameplate Values Management.
                • PC Application Software included.
                Transformer Turns Ratio Meter

                 Electrical Specifications:  

                Reference Conditions23± 5 (30 to 50% RH) range.

                 Add 25ppm/ for 0° to 18 and 28° to 50 to all accuracy specifications.

                 No external electrical or magnetic fields.

                Output current 150 mA for VT/PT and 50mA for CT.  Calibration cycle is 1 year. 

                Ratio Range (VT/PT)

                Autoranging0.8000 to 100001

                Accuracy (70Hz)

                Ratio Range

                Accuracy (% of Reading)

                0.8000 ~ 999.99

                ± 0.1%

                1000.0 ~ 4999.9

                ± 0.2%

                5000.0 ~ 10000

                ± 0.25%

                Ratio Range (CT)

                Autoranging0.8000 to 2000.0

                Accuracy (70Hz)

                Ratio Range

                Accuracy (% of Reading)

                0.8000 to 2000.0

                ± 0.5%

                Excitation Signal

                VT/PT Mode34Vrms max                 

                       CT ModeAuto Level 0 to1A, 0.1 to 20Vrms

                Excitation Current     


                                       Range0 to 1000mA                          

                               Accuracy:±(2% of Reading +2mA)

                Excitation Frequency (Hz)

                50, 55, 60, 70, 100, 120, 200, 240, 300, 400


                5” Large dot matrix LCD display (240*128) with backlight

                Power Source

                Rechargeable Lithium Battery, 3400mAh

                Battery Life

                Over 10 hrs of continuous operation. Battery life (%) indication

                Battery Charger

                Universal input (90 to 264Vrms input)

                Charging Time

                4 hrs

                Data Storage

                4096 Files Each (VTM, CTM, VTR, CTR, BMP)

                Date/ Time

                Battery-backed, Real-time Calendar clock

                Measurement Method

                ANSI / IEEE C57.12.90 and IEC 600076.1

                Operation Environment

                5°C ~ 50°C, 85% RH

                Storage Environment

                -20°C ~ 60°C, 75% RH


                1. Test leads (set of 2) 

                2. Alligator clips (4pcs.) 

                3. Rechargeable lithium battery 

                4. User manual 

                5. AC adaptor 

                6. Power cord 

                7. Software CD & Manual

                8. Carrying bag