PQ-Box 50 - The Mobile and Universal Power Quality Meter
For systematic troubleshooting of network faults and root cause analysis of voltage problems during operation.
For the targeted analysis of grid disturbances and voltage problems in electrical systems. Suitable for grid operators, industry, and technical infrastructure when causes need to be clearly documented.
Typical Application:
- Recurring faults whose cause must be clarified on site
- Unusual voltage conditions at individual feed points or outputs
- Clarification of causes after failures, malfunctions, or quality complaints
- Documentation of conditions before and after changes to the system
This Device Is Suitable If:
- You not only suspect malfunctions, but need to prove them conclusively.
- You want to clearly identify the time and cause of abnormalities.
- You need measurement data for internal decisions or for third parties.
- You want to perform a time-limited analysis directly at the affected point.
For Harsh Environments and Tight Spots
PQ-Box 50
The perfect tool for energy management audits to ISO 50001. Our universal power quality meter PQ-Box 50, has been developed for wide-ranging use and comes with an integrated power unit and robust housing, all in a small space. This network analyzer is for universal deployment and is ideal for mobile measurements in harsh environments or where space is highly limited.
Further questions or want to start an enquiry? Please click “Product Enquiry”.
A. Eberle GmbH & Co. KG
Measure. Regulate. Across All Grids.
A. Eberle GmbH & Co. KG, founded in 1980 and headquartered in Nuremberg, Germany, operates in the field of measurement and regulation technology for the energy sector as well as for medium-sized and large industrial companies. Our products and services ensure and enhance the availability of energy supply across all voltage levels and support the integration of renewable energy sources into power grids.
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Cross-Product Downloads
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Feature Matrix
Product Overview A. Eberle
A. Eberle Seminars in Nuremberg
PQ-Box 50
PQ-Box 50
Instruction Manual
Technical Data Sheets
Certificates
Accessories
Accessories
Current Clamp
Rogowski Current Clamps
Adapter Cable Set
Remote Access
Calib-Box
An Extremely Robust and Compact Housing
When developing our PQ-Box 50, the device’s compact design was our primary concern. With very reduced dimensions of only 220 x 110 x 40 mm and a weight of just one kilo, the power quality meter shines wherever restricted space is an issue. Naturally, despite its small size, our PQ-Box 50 not only reaches protection class IP 65 but is also a certified Class A device.
WLAN Interface for Cableless Communication with the Software & App
The data recorded by the power quality meter PQ-Box 50 can be transferred either by USB interface or a rapid WLAN interface to the evaluating PC. The device comes with our extensive WinPQ mobile evaluation software, which can be installed on as many PCs as you wish. To round off the excellent user experience, we have developed the PQ-Box app for both Android and iOS. The app allows you to display a wide range of online measurements and alter configurations for current and voltage transformers, measurement intervals or nominal voltages of the PQ-Box 50.
All the Standards and Protocols Upheld – Making Our Products Fit for the Future
The power quality meter PQ-Box 50 creates an automatic standard assessment and event record to:
- EN 50160
- IEC61000-2-2
- IEC61000-2-12
- IEC61000-2-4
- NRS048
- IEEE 51
Standard Accessories & Device Installation – How Your PQ Box Arrives
- power quality meter »PQ-Box 50«
- USB cable
- 4mm safety sockets incl. inserts for worldwide sockets
- 5 Delphin terminals (3x red, 1 x green, 1 x blue)
- Case for measuring device and accessories
- Hardware operating instructions (software instructions via website and included in software)
- QR code for downloading WinPQ mobile software
Analyse Faults in the Ripple Control Telegram With Ripple Control Analysis
In addition to measuring the ripple control level, the class a analyzer is also able to trigger a ripple control frequency and capture the voltages and currents for a set frequency. The complete telegram can be shown to a length of 210 seconds, while a wide range of parameters can be set in the measurement device (triggering threshold, recording threshold, ripple control frequency, bandwidth of the filter curve for ripple control frequency).
Not Sure What Device Is the Right One for You?
Find the Right Power Quality Analyzer for Your Application
PQ-Box ONE
PQ-Box 50
PQ-Box 150
PQ-Box 200
PQ-Box 300
20,48 kHz
Sampling frequency voltage20,48 kHz
Sampling frequency curent-
2 (16-bit)
Input voltage (resolution)1 (16-bit)
Input current (resolution)-
1 GB
Memory size•
WLAN / USB-C(UPS 30 s)
Operating time via battery 20,48 kHz
Sampling frequency voltage20,48 kHz
Sampling frequency current-
4 (16-bit)
Input voltage (resolution)4 (16-bit)
Input current (resolution)-
1 GB
Memory size•
WLAN2 h
Operating time via battery 20,48 kHz
Sampling frequency voltage20,48 kHz
Sampling frequency current-
4 (24-bit)
Input voltage (resolution)4 (24-bit)
Input current (resolution)-
4GB (32)
Memory size (optional)S1
WLAN4,0 h
Operating time via battery 40,96 kHz
Sampling frequency voltage40,96 kHz
Sampling frequency current4 MHz
Sampling frequency transient measurement4 (24-bit)
Input voltage (resolution)5 (24-bit)
Input current (resolution)•
Binary input8GB (32)
Memory size (optional)S1
WLAN4,0 h
Operating time via battery 40,96 kHz
Sampling frequency voltage40,96 kHz
Sampling frequency current409,60 kHz
Sampling frequency transient measurement4 (24-bit)
Input voltage (resolution)5 (24-bit)
Input current (resolution)•
Binary input8 GB (32)
Memory size (optional)S1
WLAN3,5 h
Operating time via battery
WinPQ mobile
High-quality analysis software
WinPQ mobil was designed to support the user in evaluating the data. The clear presentation of the measured values was the main focus. Thus, the software not only advances the PQ-Box, but also the user.
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Comprehensive 2026 guide to power quality analysers: selection criteria, applications, standards, and future trends for reliable power quality monitoring.[...]
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Short video presentation »PQ-Box ONE«
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Ahead of the official launch on February 25, 2026, we are releasing a short video about the new »PQ-Box ONE« that provides an initial overview of the key features of the new PQ measuring device.[...]
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Blogpost
»PQ-Box 150« and »PQ-Box ONE«
15. January 2026
PQ-Box 150 and PQ-Box ONE in practical comparison: PQ-Box 150 and PQ-Box ONE both deliver Class A measurements, but differ in terms of installation, handling and areas of application.[...]
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Webinar
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3. December 2025
Webinar recording from 2025-11-26: »Cyber Security« - A Challenge for European Energy Companies[...]
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A. Eberle at the Schwabach City Run 2025
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»PQMobil« Training Video 8: Setting up remote access for the PQ-Box
21. November 2025
This video shows how to configure a PQ-Box remotely via Wi-Fi, LAN, network, and the Internet using a VPN tunnel, view live data, and transfer measurement data. Enjoy the video.[...]
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Total Harmonic Distortion (THD) in Low Voltage Networks
20. November 2025
This study examines harmonic distortion in modern low-voltage grids, showing real measurement data, key standards (EN 50160, IEC 61000-3-2/-4-30) and practical ways to reduce THD in applications such as[...]
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Special Publication
Power Quality Monitoring in Buildings - A Key Factor in Modern Building Design
12. November 2025
Discover how Power Quality Monitoring in Buildings improves reliability, efficiency and grid stability. Learn more in our technical article.[...]
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Continuous Power Quality Monitoring in the Jupiter Data Centre - Voltage Quality at Exascale Level
5. November 2025
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Power in Multiphase Systems
7. August 2025
This technical report highlights the special features of power transmission in three-phase systems and offers valuable insights into the optimisation and analysis of modern power grids.[...]
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Webinar
»PQMobil« Webinar: New Features/Functions for Your PQ-Box/es: Presentation of WinPQ mobil V8 & V7 legacy
5. August 2025
Webinar recording from 2025-07-29: »PQMobil - New Features/Functions for Your PQ-Box/es: Presentation of WinPQ mobil V8 & V7 legacy«. [...]
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Blogpost
Visit From the Rudolf Diesel Technical School at A. Eberle
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We were happy to welcome you, Rudolf-Diesel-Fachschule! Yesterday, we had the pleasure of welcoming two classes of future electrical engineering technicians from the Rudolf-Diesel-Fachschule Nürnberg[...]
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TOP 100 Awards 2025: Innovation for the Energy Future
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💡 As part of the TOP 100 Awards 2025, we were honored to receive a special recognition last week in Mainz – personally presented by TV host and science journalist Ranga Yogeshwar.[...]
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University Excursion: Pentecost Excursion of the Friedrich-Alexander-University Erlangen-Nuremberg (FAU)
14. July 2025
As a company dedicated to innovation, education, and the energy transition, we are pleased to have once again supported the Whitsun excursion of Friedrich-Alexander University Erlangen-Nuremberg (FAU)[...]
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14. July 2025
Welcome to the team! We welcome our new colleagues at A. Eberle.[...]
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Specialist Training on Power Quality
18. June 2025
On 27 May 2025, everything revolved around electricity, faults and how to recognise them in a specialist training course on power quality at the Balthasar Neumann Technical Centre in Trier (BNT).[...]
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Webinar
»PQMobil« Webinar: Power Quality Analysis in Public & Industrial Power Grids – Part 3
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Webinar recording from 2025-04-02: »PQMobil - Power Quality Analysis in Public & Industrial Power Grids – Part 3«. [...]
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Training Video
»PQMobil« Training Video 7: Measurement Data
15. April 2025
This video is all about the measurement data. What data does the PQ-Box record and what is the best way to configure it beforehand? [...]
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Measuring the Voltage Drop
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