Single Phase Portable Reference Standard

The single phase portable reference standard (SPRS-1102) from SANDS is a hand held device that helps to calibrate the error present in the single phase energy meter i.e. the meter under test (MUT). The SPRS supports both static and electro-mechanical types of meters. It can also be used to compute the voltage, current, energy, phase angle etc of the meter under test. It has an LCD display and an alphanumeric keypad to suit the user. It can be interfaced with the PC for analysis. It has a capability of storing 1000 test results.


  • Current range up to 60 Amperes
  • Accurancy class 0.2/0.2S/0.5/0.5S
  • Automatic error computation
  • 1000 test results storage facility
  • Harmonics upto 7 th & THD
  • Optical sensor for electro mechanical & electronic meters
  • RS-232 communications to BCS
  • Calibration LED for Primary clibration
  • Powered by measuring circuit


  • 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


  • Elimination of human error
  • Confident test results
  • Portable, compact & easy to use
  • Interface to an External printer (optional)
  • Voltage clip – type Connectors for safety
  • Testing without service interruptions
  • No external projections, by which the epuipment could be damanged
  • 1000 Records storage

Working with SPRS

Following steps are involved in performing calibration of meter using SPRS.

  1. Perform power-up operation of the SPRS
  2. Selection of Meter Calibration menu
  3. Entering the meter related information like meter serial number, consumer number, consumer number, consumer ID, meter type, etc. This information is saved along with the test result of the meter for future reference.
  4. Entering the testing related parameters like MUT meter constant, testing mode, number of pulses, etc. This information is necessary as testing is carried out according to the selection.
  5. Performing actual test. Once the mode of testing and other parameters are entered user can carry out the actual testing as per selection.

Connection Diagram

Technical Specifications

• Voltage 240V ± 30%
• Current 100 mA to 10Amps-ring Ct
200 Ma to 60A -clamp on CT
• Frequency 50Hz ± 10%
• Voltage burden Less than 8VA
• Current burden Less than 1VA
• Power factor Zero lag – Unity – Zero lead
• With ring Ct 0.2/0.2S
• With clamp on CT 0.5/0.5S / 0.2/0.2S
• Format 4 lines * 20 characters
• Day light visibility Backlit LCD
Display resolution & Parameters
• Voltage 0.01
• Current 0.001
• Power factor 0.001
• Frequency 0.001
• Energy 0.0001
• Error percentage 0.01%
• Type Sealed membrane (Tactile)
• Number of key Alpha numeric keypad with separate keys for alphabets & numbers
• 1000 test results along with meter, consumer information
Optical Scanner
• Led pulse for electronic meters
• Rotor mark for electro mechanical meters
• RS-232 port
• Dimension Not exceeding 250 mm*

100 mm* 60 mm

• Weight less than 0.5Kg
• Enclosure High strength molded ABS
Environmental Specification
• Operating Temperature range -10 C to 50 C
• Storage Temperature range -25 C to 70 C
• Relative humidity 95% non condensing
• Degree of Protection IP 52
• IEC 60687
• IS 12346
• IS 14697