Continuous Waveform Recording

Continuous Waveform Recording is the streaming of high resolution waveform and RMS data to memory continuously with no gaps. The PQPro is the only portable instrument that can do this without data compression which can result in loss of fidelity. Data is stored on a removable SD memory card. Both the PQPro firmware and the PV II software have been optimized to allow the user to quickly sift through the large amount of data to find areas of interest.

There are two firmware applications for the PQPro™ that can do Continuous Waveform Recording.


Continuous Waveform eXtended Continuous Waveform
Firmware Part of the standard Power Quality “PQ” firmware, installed on every PQPro Optional “XCW” firmware.
Storage rate
  • Waveforms: 12 cycles @ 60Hz (10 cycles @ 50Hz)
  • RMS: Every 8 milliseconds. Min/Max/Avg stored every 0.2 seconds.
Sample rate 256 samples per cycle, every cycle Adjustable from 64 to 1024 samples per cycle, every cycle
Number of channels Up to 6 channels (3 voltage, 3 current) Up to 8 channels (4 voltage, 4 current)
*At 1024 samples per cycles, limited to 6 channels
Individual data file size 500MB
Supported SD card capacity 4GB to 32GB 64GB and 128GB

The following table shows the number of days that PQPro can record when using Continuous Waveform Recording.

PQ Firmware XCW Firmware
Frequency Sample Rate Channels 32GB 64GB 128GB
Hz per cycle

#ch Voltage Current
8 V1, V2, V3, V4 I1, I2, I3, I4
6 V1, V2, V3 I1, I2, I3
4 V1, V2, V3 I1
3 V1, V2, V3
2 V1 I1
1 V1