Three phase reference standard meter -TPRS

Three phase reference standard meter -TPRS

The Three Phase Reference Standard Meter (TPRS-1107) is portable equipment from SANDS. The main objective of this device is to calibrate the errors in three-phase and single-phase energy meters i.e. the meter under test (MUT). The TPRS supports both static and electro-mechanical types of meters. It can also be used to compute the voltage, current, energy, power factor etc of the meter under test. It has an LCD display, an alphanumeric keypad that makes it easy for the user to operate the TPRS. It can be interfaced with the PC for data analysis. It has the capability of storing up to 8000 test results.


  • Storage of 8000 test results with search facility
  • Primary calibration LED (kWh and KVArh)
  • Graphical Display 240 x 128 with backlit
  • Membrane keypad with separate keys for alphabets and Numbers”
  • Sofware diagnostic feature
  • Data transfer through RS-232 serial port
  • External portable printer for on-site printing (optional)
  • Current transformer ratio checking
  • Simultaneous test for CT operator meters in the primary and secondary side of CT


TPRS-1107-H TPRS-1107-L TPRS-1107-LH TPRS-1107-H+ TPRS-1107-L+ TPRS-1107-LH+
Applications HT Meters LT-CT operated meters HT Meters HT Meters LT-CT operated meters HT Meters
LT-Whole current meters LT-CT operated meters LT-Whole current meters LT-CT operated meters
LT-Whole current meters CT Ratio test for
LT-CT operated meters
LT-Whole current meters
CT Ratio test for
LT-CT operated meters
Direct Mode
Current 10mA-10A 10mA-10A 10mA-10A NA NA NA
Accuracy 0.2S / 0.2 0.2S / 0.2 0.2S / 0.2
Clamp-on Mode
/Primary current 
Current NA 500mA-100A* 500mA-100A* NA 500mA-100A* 500mA-100A*
Accuracy 0.5S / 0.5 / 0.2S / 0.2 0.5S / 0.5 /0.2S/0.2 0.5S / 0.5 /0.2S 0.5S / 0.5 /0.2S
Current Measurement
Current NA NA NA 50mA-10A 50mA-10A 50mA-10A
Accuracy 0.2S 0.2S 0.2S
Display Resolution & Parameters
Volage 0.01 V
Current 0.0001 A
Power Factor 0.001
Frequency 0.001 Hz
Energy 0.00001 Wh
Error Percentage 0.00%
To analyse the waveform distortion
To identify cases of CT saturation
Available for both Voltage and Current channels
Voltage and Current Harmonic Distortion
Analysis upto 21 st Harmonic
Instantaneous Measurement
Simultaneous display of all Instantaneous parameters
Phase-wise – Voltage, Current, Active & Reactive Current and Power Factor
Phase wise active, Reactive and Apparent Power
Average Power Factor and Frequency
Dimension 275 x 210 x 110 mm (not exceeding)
Enclosure ABS FR (V-O) (High Strength Moulded)
Operating Temp -10 to 50 Deg C
Storage Temp -25 to 70 Deg C
Rel. Humidity 95% non-condensing
Phasor diagram to visualise the phase sequence and lead/lag conditions
Identification of CT reversal, Phase Sequence reversal, CT / PT interchange, Low Power factor
IEC 60687
IS 14697


  • High current range clamp-on CT with cable
  • Low current range clamp-on CT with cable
  • Cable for ring CT
  • Cable for field & laboratory use
  • Scanner with stand
  • Snap switch for manual operation
  • Communication cable for downloading
  • Base computer software
  • Portable Printer optional
  • Optical probe for DLMS Dial Test