One instrument, multiple applications

Metrum's world leading PQX3-FR instrument is both a full feature fault recorder, and a high frequency measurement tool for power quality. The instrument is equipped with multiple current channels, allowing measurement on several different feeders simultaneously. The solution includes several intelligent circuits; moreover, it supports both WiFi-communication for real time analysis on site, and numerous communication protocols.

Proactive high quality analysis

In case of faults in the electrical grid, the PQX3-FR provides the customer with instant information, so that severe and costly faults may be avoided early on.

Further, the high quality measurement data on power quality and faults generated by the PQX3-FR is analyzed in the user friendly system application PQ Controller. Additionally, PQ Controller provides analysis reports in accordance with norms and standards.

3rd generation instrument

PQX3-FR is part of the new 3rd generation measurement instrument and is developed to use the latest technology available. In support of the user, the platform includes pattern recognition analysis utilized for continuous proactive control and automatic data analysis.

The instrument is based on a high performance solution including several intelligent circuits; storage and transfer of data to the central system is reliable and operates quickly.

Technical specifications


Parameters Specification Information PQX3-FR
Voltage Inputs 0-460 V RMS Differential voltage inputs (+/-), 51,2 kHz/channel 4
Voltage HV Inputs 0-6 kV peak Built-in high frequency inputs (2 MHz) 4
Current Inputs 0-10 A RMS Differential current inputs (+/-), 51,2 kHz/channel 9
General Inputs 4-20 mA General measurement inputs 4
Digital Inputs 20 V peak - 400 V peak Digital inputs supporting FR-options 16
Digital Outputs Max 350 V peak (0,1 A) For alarm and control 8

Power Supply

Parameters Specification Information PQX3-FR
Power Supply Range 85-264 VAC/110-350 VDC (47-63 Hz) Yes
Internal Backup Yes

Norm Conformity

Parameters Specification Information PQX3-FR
IEC 61000-4-30, Class A < 0,1 % Reference instrument Yes
IEC 61000-4-7 Harmonic measurements 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, Netcode NL, ZS387 etc) Wide range of standards supported Yes
User defined reports Calculated in the instrument Yes
Storage intervals Selectable storage intervals Yes
PQDIF format Optional export Yes


Parameters Information PQX3-FR
Memory 32 GB
Sampling-rate, U/I Standard Inputs Selectable sampling frequency 51,2 kHz
Sampling-rate, HV Inputs 2 MHz
Accuracy IEC 61000-4-30, Class A < 0,1 %
Resolution (U/I) Voltage/Current Inputs 16 bit
Resolution (GI) General Inputs 12 bit
Input Impedance - Voltage Inputs 10 MOhm
Input Impedance - Current Inputs 10 milliOhm
Anti-alias filter Yes
PLL-synchronisation Yes


Parameters Information PQX3-FR
RS-232 Modem port Yes
USB Computer port Yes
USB 2 Data storage Yes
Ethernetport 1 (RJ-45) Ethernet port Yes
Ethernetport 2 (RJ-45) For redundancy Yes
CL-port For current loop Yes
RS-485 For multidrop-communication Yes
Time synchronization port For external time synchonization (IRIG-B) Yes
WiFi WiFi-communication (optional) Yes

Communication protocol (optional)

Parameters PQX3-FR
MODBUS-TCP protocol Yes
IEC 61 850 protocol Yes

Mechanical data

Parameters Information
Size (Width x Height x Depth) 440 x 88 x 294 mm
Model 19'' rack
IP rating IP54
Weight 4,25 kg
Humidity 10 - 85 % non-condensing
Temperature 10 °C to +55 °C