Open Source PMU Comparison Chart

Properties GridTrak Open Source PMU (GTosPMU) OpenPMU
Technology Voltage reference crossings converted to digital and directly timed


Hardware dsPIC30F3013 Micro Controller based Open Source PMU Sensor Kit

National Instruments NI-DAQ, Sound Card, or other DAQ with custom OpenPMU GPS Clock & Sampling Trigger


Microchip C30, 16bit, open source code provided

GPS Clock – Microchip C18


Open Source C# .NET host PC application for sensor configuraiton and local observation and data recording, compatible with openPDC and IEEE C37.118-2005 compliant software

Open Source Python code library
GPS Optional - Integration testing scheduled for March 2011

GPS or other UTC 1PPS source required

Availability Available February 2, 2011 as Kits and Assembled Sensors

Summer 2011 (expected)

Project Life Cycle R&D work in progress for at least 3 years from Jan 2011

Continuous development

Cost Kit = $150, Assembled = $500 (USD)  (GPS not included at this time)

~ $400 (less if using existing NI-DAQ)

More Info Contact Arnold Stadlin clockdoctor
Signal Input 9-12 V AC/AC Linear Transformer, Adapters work for foreign conversions

3-phase & neutral voltages and currents

Measurements AC Voltage, single phase per sensor, Voltage Reference Crossings

14-bit, +/- 10 V

Measurements Rate Measurements are made each AC cycle

240 samples / cycle at 50 Hz (200 at 60 Hz)

Minimum Sample Time 1.2 AC Cycles, consecutive cycles overlap by about 20%

FFT uses minimum 2 cycles, sliding window

Nominal Frequency and Range 50Hz or 60Hz  +/- 1.0%

50 Hz / 60 Hz +/- 1.0%

Packet Transmission Rate Design Maximum = 60,  Reliably Tested = 20 packets per second

50 / 60 Hz, 25 / 30 Hz, 10 Hz

Data Connectivity RS232 115200 bps over Serial Port or Serial/USB adapter

UDP/IP using NMEA style plain text

Power Requirement 9-12V AC/AC Linear, non-Switching, Transformer is shared between input signal and circuitry. Optional +9V DC backup battery.  Optional +5V DC.  Jumper for isolating the signal input from the circuit power supply.

30 W auxiliary mains supply


Last edited Mar 2, 2011 at 5:00 AM by ajstadlin, version 11


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