Proactive analysis for digitalized grid

Metrum PQX3-M is a class A reference instrument for energy, power quality and disturbance analysis. The instrument is designed for easy installation in various environments and applications and thus offers an optimal and comprehensive measurement for both electricity distribution companies and industry.

The measuring instrument has maximum measurement performance. Due to high accuracy and an intelligent basic platform, the Metrum PQX3-M works excellently as both an energy control meter and a class A power quality reference meter.

In addition, the instrument is adapted for proactive disturbance analysis. Detect deviations before they lead to costly faults and outages!

High-quality analysis

The PQX3 instrument series was developed to provide high-quality measurement data with a focus on energy, power quality and disturbances. All data can be analyzed with the central Metrum PQ Controller system, which includes a report generator according to current standards, and several different analysis functions (such as graphical disturbance analysis).

Third-generation measuring instrument

The new PQX3-M was developed with the latest available technology and belongs to the third generation of Metrum measuring instruments. The high-performance platform includes proactive and automatic analysis of data that facilitates its use throughout the process.

The instruments support both multi-triggering and area triggering with several selectable configuration options. This expands the field of application and gives the possibility of dynamic control.

Disturbance recorder

Metrum PQX3-M is a full-scale disturbance recorder. The digital inputs can be used to trigger various events, such as breaker switches. The instrument records waveforms and current status at high speed on all channels.

The high-resolution measurement enables proactive fault analysis and detection of incipient and intermittent faults in the grid, minimizing the risk of unnecessary and costly outages.

Technical specification


Parameters Specification Information PQX3-PQR
Voltage inputs 0–460 V RMS Differential voltage inputs (+/-), 51.2 kHz/channel 4
HF voltage inputs 0–6 kV peak Built-in high-frequency inputs (1 MHz) 4
Current inputs 0–10 A RMS Differential current inputs (+/-), 51.2 kHz/channel 4
General inputs -20 mA to +20 mA 51.2 KHz 2
Digital inputs 20–150 VDC Digital inputs that support FR options 2
Digital outputs 120 VAC/150 VDC For alarm and control 2

Power supply

Parameters Specification Information PQX3-PQR
Supply voltage 85–264 VAC/110–350 VDC (47–63 Hz) Yes
Built-in backup Yes

Norm compliance

Parameters Specification Information PQX3-PQR
IEC 61000-4-30, class A < 0.1% Reference instrument Yes
IEC 61000-4-7 Harmonic measurement Yes
IEC 61000-4-15 Flicker measurements Yes
EN 50 160 Calculated in the instrument Yes
EIFS 2013:1 Calculated in the instrument Yes
National standards (FoL, DEFU, NL, ZS387, etc.) Large number of standards supported Yes
Custom reports Calculated in the instrument Yes
Storage intervals Selectable storage intervals Yes
PQDIF-format Selectable export Yes


Parameters Information PQX3-PQR
Memory 32 GB
Sampling rate, U/I Standard inputs 51.2 kHz
Sampling rate, HF inputs 1 MHz
Accuracy IEC 61000-4-30, class A < 0.1%
Resolution (U/I) Voltage/current inputs 16 bit
Resolution (GI) General measurement inputs 16 bit
Input impedance – voltage inputs 10 MOhm
Input impedance – current inputs 10 mOhm
Anti-aliasing filter Yes
PLL synchronization Yes


Parameters Specification Information PQX3-PQR
USB Computer port Yes
Ethernet port 1 (RJ-45) Ethernet port Yes
Ethernet port 2 (RJ-45) For redundancy Yes
Time synchronization For external time synchronization (NTP/PTP/IRIG-B) Yes

Physical data

Parameters Information
Size (H x D x W) 160 x 240 x 90 mm
IP class IP41
Weight 1.4 kg
Humidity 10–85% non-condensing
Temperature -10 °C to +55 °C