Click here to discover the PQube 3 and the new PQube 3e!

How can you use the PQube?

Simply connect your PQube to the AC power for your system or building.
The PQube is like an aircraft's black box. It records the details of every power disturbance. When your system is "flying" normally, your PQube records every detail about power consumption for you.
No Software Required. Lab Grade Precision. Plug and Play.

PQube Highlights

  1.  Low-cost, high-precision power quality and energy monitor
  2.  Embedded design for reliable 24/7 monitoring
  3.  Direct remote access, anytime, anywhere
  4.  Plug-and-play compatibility, No Software Required!
  5.  Latest PQube Firmware: v2.1.8 (Download) NEW! 
PQube Compliance

PQube® AC Power Monitor
Embedded power quality and power quantity monitoring

Download Firmware (2.1.8)
Download PQube 2.1.2 Brochure
Independent Review

Power Quality monitoring: "Your PQube is like the black box on an aircraft: if anything goes wrong with the power, it records all the details."

  1. Three-phase and single-phase monitoring up to 690V, 50/60/400Hz.
  2. Auto power configuration for any world-wide power.
    1. Voltage dips, swells, and interruptions - waveforms and RMS graphs.
    2. Over-frequency and under-frequency events.
    3. 1-microsecond high-frequency impulse detection.
    4. THD, TDD, and time-triggered snapshots.
    5. Voltage and current unbalance.
    6. IEC Flicker - Pinst, PST, PLT.
    7. Detailed event recording, plus daily, weekly, monthly trends. Cumulative probability, histograms, and more.

    Energy monitoring: "The most accurate little monitor on the market. Complete energy information."

    1. Watts, VA, VAR's, true Power Factor, Watt-hours, VA-hours.
    2. Daily and accumulated CO2, and CO2 rate (patent pending).
    3. Peaks: single-cycle peak, 1-minute, and 15-minute averages.
    4. CT ratios support up to 50,000 amps . PT ratios support up to 6,900,000 volts.
    5. Daily, weekly, monthly trends. Load duration curves and more.

    No software required! The PQube automatically writes these files on a standard digital camera SD card:

    1. Spreadsheets: CSV Excel®-compatible files; events, trends, statistics.
    2. Pictures: Event and trend/statistics graphs - dual-language picture graphs output directly from PQube in typical GIF format
    3. PQDIF: the IEEE's standard for power quality data files.
    4. Text, XML, and HTML summaries: perfect for interfacing with other programs.

    Multiple Language Support

    PQube Languages

    Easy data retrieval:

    1. Sneakernet: Pop out SD card, just like a digital camera, and copy files to your PC.
    2. Ethernet:
      1. Email for easy approval by IT department. Automatically sends you events, trends, and statistics in the language of your choice.
      2. Built-in web server - see live meters, retrieve history files, and more.
      3. FTP server for easy file transfer.
      4. Modbus-TCP.
  3. Additional channels: two analog inputs, one digital input, one relay output, and two temperature-humidity monitoring channels.
  4. 256 samples-per-cycle measurements on all channels.
  5. About 2 gigabytes per year of data. PQube comes standard with 16-gigabyte SD-card for data storage. Can use 16-gigabyte SD cards.
  6. Full color display. 25+ languages, date/time setup, recent events, meters, and more.
  7. DIN-rail or panel mount.
  8. Built-in Li-Ion UPS. Power from 24 VAC, 24-48VDC, or optional 100~240 VAC power supply.
  9. FREE individual NIST calibration certificate for every PQube! Download here

PQube Compliance
Fascinating Video from Northern Power about how PQubes enable grid upgrades
PQube Installation at Ba Na Hills, Vietnam
(world record holder for longest non-stop single track cable car)

    Semiconductor manufacturing

    1. The PQube is designed specifically for embedding in semiconductor tools
    2. Reduce service costs, increase tool uptime, solve power problems at fabs

    Industrial equipment

    1. Size and price are perfect for embedding in automated machinery
    2. Quickly pay for PQube with avoided service calls
    3. Track energy trends over time - detect developing leaks, failing motors, and more


    1. Perfect for embedding in MRI and CAT scanners.
    2. Detect power quality events that cause intermittent errors, imaging malfunctions.
    3. Provide energy monitoring: the first step in improving energy efficiency in medical facilities

    Security scanning at airports

    1. World-wide necessity - must function perfectly with bad power
    2. Scanning errors can be catastrophic - embedded power quality monitoring is critical.

    Power companies

    1. Monitor key accounts at the meter, and at the critical loads: was it your problem, or a facility problem?
    2. Lowest-cost system-wide monitoring - including PQDIF output files

    Facility management companies

    1. Add value with power quality and energy monitoring
    2. PQube is the only monitoring system that doesn't require network infrastructure - just install and get useful data right away

    Military bases, government campuses, large facilities

    1. Allocate energy costs, and detect energy leaks
    2. Full carbon monitoring for green initiatives
    3. Start with no network; add e-mail later; then add full network support when needed

    Data centers

    1. AC and DC monitoring, plus temperature and humidity
    2. Monitor input and output of power conditioning - demonstrate your improvements


    1. 3-phase and 1-phase AC monitoring, with simultaneous capture of disturbances on -48Vdc
    2. Trigger on AC disturbances, -48Vdc disturbances, or both
    3. Full daily, weekly, and monthly trends and statistics for proof of service


    1. All data stored in open-format files (Excel-compatible CSV files) - easy to write your own programs for analysis
    2. Voltage, current, and DC oscilloscope waveforms, with sophisticated triggering
    3. Daily, weekly, and monthly trends and statistics: voltage, current, frequency, power, temperature, humidity, and more

    Green initiatives

    1. Direct reading of carbon emissions, using patent-pending algorithms
    2. Ultimate precision: 0.05% accuracy for sensitive energy savings measurements

    Distributed generation - wind and solar

    1. Ultra-precise 3-phase AC measurements, including net power flow
    2. Ultra-precise frequency recording and disturbances for stability analysis
    3. Detect LVRT (voltage dip) faults - speeds up acceptance tests and payment
    4. Available 1500 Vdc and 600-amp DC sensors, simultaneous with builtin AC sensors, for inverter efficiency measurements, recording DC bus disturbances

    Energy audits and Power Quality consulting

    1. Direct graph outputs (GIF format) that copy/paste into your reports - no software required
    2. Accumulated energy, peak energy, and daily/weekly/monthly trends and statistics for full understanding
    3. The most accurate, most flexible, easiest-to-use power recorder ever made for energy and power quality
PQube Compliance
Request a price quotation
GIF picture files can be opened by any picture program. You don't need any special software. You can also place GIF Graphs directly in Windows PowerPoint® presentations, Microsoft Word® reports, and so on.

Waveform Graph
The waveform graphs show you the detailed shapes of the instantaneous voltage and current waveforms.
This is useful when you are looking for specific details, at the millisecond level.
Your PQube measures all of the waveforms at 256 samples per cycle, but to graph a longer duration, you can choose to record fewer samples per cycle if you prefer (the measurements will not be affected).
RMS Graph
The RMS graphs show the cycle-by-cycle true RMS values of the voltage and current, updated every half cycle, and they also show the frequency.
This is useful when you are looking at more general characteristics of the event, at roughly the one-second level, especially if you are interested in the available energy.
The CSV files contain every data point recorded for an event. It is a standard file format and so it can be opened with almost any spreadsheet program, including Excel®.

CSV Files
The CSV files are useful if you want more detailed data, and the ability to sort individual recordings and customize your own graphs.
The event summary files give you all the critical data on an event. Each file format contains the same information, it is just formatted differently for different applications.

.HTM files
Very user friendly and open automatically with any web browser (just double-click them)
.TXT files
Easy to read. Universal
.XML files
Easier for a computer to read than the other formats.
Consider using this file if you are building an automated monitoring system.
Trend/Statistics Files Request a Price Quotation
Reference conditions for factory tests: 19~25°C, 15%~50% RH, steady-state 10/12 cycle signals. ±1/2 display count on all accuracies
 Mains Voltage Measuring Channels
   ConnectionL1, L2, L3, N PQube screw terminals [9], [11], [13], [15]
   Range of Frequency Measurement40Hz~70Hz and 320Hz ~ 560Hz. Nominal 50Hz, 60Hz, or 400 Hz auto, 320-560Hz manually selected. Specifications below apply at 50 or 60Hz.
   Mains ConfigurationSingle-phase, delta, wye or star. User selected or auto-selected
   Range of Nominal Input Voltage100VAC~690VAC L-L (69VAC~400VAC L-N) User selected or auto-selected
   Measurement ChannelsLine-to-Neutral, Line-to-Line, Neutral-to-Earth
   Sampling Rate256 samples per cycle, phase-locked to input frequency
   Measurement range0 VAC ~ 900 VAC L-L (520 VAC L-N)
   BandwidthDC to 4.7 kHz, must be locked to mains frequency (see above). For higher bandwidth see HF Impulse.
   Accuracy±0.05% rdg ±0.05% FS typical (10% ~ 150% of nominal). Every PQube factory tested at better than ±0.04%rdg ±0.04%FS. Note: FS = 345 VAC or 520 VAC, selected based on nominal line-to-earth voltage.
   RMS measurement methodTrue single-cycle RMS, phase-locked to each channel, updated every 1/2 cycle. URMS½ per IEC 61000-4-30 Class A. Also 10/12 cycle true-RMS per IEC 61000-4-30 Class A.
   HF Impulse detectionL1-E, L2-E, L3-E. ±450Vpk nominal threshold detected through 2-pole high-pass 4.8 kHz nominal filter. Every PQube factory tested with 1-µsecond 10%-to-90% impulses; trigger required at ±650Vpk, must not trigger ±250Vpk.
   Unbalance - voltageANSI, IEC, and GB measurement methods. Range: 0.0% ~ 100.0%. Accuracy equivalent to rms voltage specification applied to measurement method.
   THD - voltageMeasurement method: Discrete Fourier Transform of phase-locked 256-samples-per cycle. Range: 0.0% - 100.0% Accuracy: ±0.2% at 60-Hz test waveform having typical harmonic content (5% 5th, 2.5% 7th, 1.5% 9th, and 1% 11th). Samples measured through 6-pole low-pass analog anti-alias filter, 3 dB frequency 4.7 kHz.
   Flicker±5% rdg at all reference points on the eye-response curve defined in IEC 61000-4-15 for PST≥1.
   Harmonics and Interharmonics Range: 0% ~ 100% of fundamental, measured up to the 63rd order (harmonics displayed up to the 50th order).
   Harmonic Accuracy IEC 61000-4-7:2002 Class II, typical, up to the 50th order, for units manufactured after February 2010.
   IsolationPQube provides more than 7500 VDC isolation to Earth. UL/IEC 61010 reinforced insulation.
   PT Input Ratio Range1:1 to 10000:1
   Installation categoryCAT IV UL/IEC 61010 for voltages up to 300VAC L-N (equivalent to 480VAC L-L), CAT III for higher voltages. Pollution Degree 2
 Analog Input Channels
   ConnectionAN1, AN2 PQube screw terminals [22], [30]
   Nominal InputHigh range: 0 ~ 30 VAC or ±60 VDC to Earth max. Low range: 0 ~ 7VAC or ±10VDC to Earth max.
   Input Impedance 800 kΩ to Earth
   Full Scale70VAC, ±100VDC
   Measurement ChannelsAN1-Earth, AN2-Earth, AN1-AN2. DC Energy Mode adds DC Power and DC Energy.
   User-specified Input Ratio1:1 to 10000:1
   Sampling Rate12.8kHz or 15.4kHz (measured at same rate as mains voltage measuring channels)
   Accuracy±0.2% rdg ±0.2% FS typical (10% ~ 100% FS), ANx-Earth. Every PQube factory tested at better than ±0.1% rdg ±0.1% FS AC.
 Digital Input
   ConnectionDIG1 PQube screw terminal [24]
   Rating60VDC to Earth
   Wetting5.4VDC at 3µA
   Threshold1.5V±0.2V with respect to PQube's Earth terminal, with 0.3V hysteresis typical
   Sampling Rate12.8kHz or 15.4kHz (sampled at same rate as mains voltage measuring channels)
 Frequency Measurement
   Range40Hz to 70Hz and 320Hz to 560Hz
   Accuracy±0.01Hz, steady state
   MethodCycle-by-cycle zero-crossing detection on L1-E or L2-E (auto-selected). Firmware phase-locked for frequency slew rate up to 5 Hz/sec. For 50/60 Hz, measured through an 9-pole low-pass analog filter, 3-dB frequency 76 Hz. For 400 Hz, measured through 7-pole low-pass filter, 3-dB frequency 1 kHz. Poles and 3-dB frequency are auto-selected based on nominal frequency.
 Optional Current Measuring Modules
   Measurement TypePass-through (built-in current transformers)
   Crest Factor 3.5 (±70 amps instantaneous for CT4-20A, ±350 amps instantaneous for CT4-50A)
   Sampling Rate 12.8 kHz or 15.4 kHz (sampled at same rate as mains voltage measuring channels)
   Accuracy±0.2% rdg ±0.2% FS typical (10% ~ 120% FS). Every PQube factory tested at better than ±0.15% rdg ±0.15% FS.
   Burdenless than 0.1VA
   Conductors0.34 inches (8,6mm) max. diameter, 600V UL-recognized insulation required
  XCT4-1A-00, XCT4-5A-00
   Measurement TypeExternal current transformer
   CT input ratio range1:1 to 10000:1
   Crest Factor 3.5 (±3.5 amps instantaneous for XCT4-1A, ±17.5 amps instantaneous for XCT4-5A)
   Sampling Rate 12.8 kHz or 15.4 kHz (sampled at same rate as mains voltage measuring channels)
   Accuracy - excluding external CT's±0.2% rdg ±0.2% FS typical (10% ~ 120% FS). Every PQube factory tested at better than ±0.15% rdg ±0.15% FS.
   BurdenLess than 0.1VA
   Wire connectionMin. 20AWG (0,52 mm2), Max. 14AWG (2.1mm2). 600V UL- recognized insulation required
   Max screw torque 7 inch-pounds (0.8N-m)
  XCT5-0.333V-00, XCT5-1V-00, XCT5-5V-00, XCT5-10V-00, and CTE1
   Measurement TypeExternal current transformer
   CT input ratio range1:1 to 10000:1
   Nominal0.333V RMS, 1V RMS, 5V RMS, and 10V RMS
   Crest Factor3.5 (±1.17Vpk, ±3.5Vpk, ±17.5Vpk, and ±35Vpk)
   Sampling Rate12.8kHz or 15.4kHz (measured at same rate as mains voltage measuring channels)
   Accuracy - excluding external CT's±0.2% rdg ±0.2% FS typical (10% ~ 120% FS). Every PQube factory tested at better than ±0.1% rdg ±0.1% FS.
   Wire connectionMin. 20AWG (0,52 mm2), Max. 14AWG (2,1mm2). 600V UL- recognized insulation required
   Max screw torque5 inch-pounds (0,6Nm)
 Instrument Power
  Screw Terminals(AC or DC) PQube POWER screw terminals [23], [31]
   AC Input24VAC ± 20% 50/60 Hz
   DC Input24-48VDC ± 20% (polarity independent)
   Power Required5VA max
  Internal UPS
   TypeLithium Polymer Battery - UL recognized (replacement batteries available from PSL)
   Capacity660mAH (30 minutes typical with new, fully-charged battery)
   Backup periodUser controlled. 1 to 10 minutes, 3 minute default.
  Optional PS1, PS2 Plug-in Module
   AC Input100~240VAC ± 10%. 50/60 Hz
   Power Required25VA max
   IsolationModule provides more than 3200VDC isolation to all other circuits
 Power Measurements
   Watts (power)Sum of true instantaneous per-phase power
   Volt-Amps (apparent power)Sum of per-phase product of RMS voltage and RMS current, taken over the measurement interval
   Power Factor (tPF)True power factor - ratio of Watts to Volt-Amps.
   VAR's (volt-amps reactive)Budeanu definition or fundamental VARs—user-selectable.
   Carbon (CO2 rate and accumulated)Based on patent-pending algorithm using watts and user-selected proportions of generator sources, and user-supplied carbon generation rates for each source.
   Current unbalanceMeasurement method ANSI C84.1.
  Accuracy excluding external CT's
   Watts (power)±0.2% typical at unity power factor, nominal voltage, 20% ~ 100% FS current. Better than ±0.25% rdg ±0.25% FS plus error due to phase angle uncertainty (<1.5° typical) for Θfundamental < ±30°, nominal voltage, 10% ~ 120% FS current. Θfundamental = angle between fundamental voltage and fundamental current.
   Volt-Amps (apparent power)Better than ±0.25% rdg ±0.25% FS typical (10% ~ 120% FS)
  Measurement interval
   Measurement intervalPhase-locked, 10-cycles (50 Hz nominal) or 12-cycles (60 Hz nominal). Approximately 5 readings per second. Actual readings per second dependent on actual frequency.
 Operating Environment
   Ambient Conditions - Operating-20°C ~ 50°C, RH 5% ~ 95% RH non-condensing
   Transient Voltages100kHz ring wave, 6 kVpk, IEC 61180, IEC 61000-4-5. Applied to voltage measuring terminals with Performance Evaluation Class 1. (When applied to optional power supply mains terminal, supply's fuse may operate in PE Class 3 at test levels greater than 4 kV.)
   EFT Burst Immunity4 kV pk, IEC 61000-4-4, Performance Evaluation Class 1. Applied to power measuring terminals and optional PS1 power supply mains terminals
   RF Field Strength Immunity3V / m, IEC 61000-4-3 Test Level 2
   Magnetic Field Strength Immunity30A / m, IEC 61000-4-8 Test Level 4
   Ingress Protection Rating (IP Rating)IP20H, IEC 60529
 Agency Approvals and Listings
   UL (Underwriters Laboratories)UL-recognized, cULus - File Number E220936
   RoHSCertified - PSL Construction File PQube-001
   CECertified - PSL Construction File PQube-001, TUV CB Test Certificate US-TUVR-4368-A2
   ITCCertified - 20080102-01-CE, 20080326-01-RI
   TUV Bauart-markCertified - TUV Report 30880881.009
   ABS ShipyardCertified - 2009 Steel Vessels Rules 1-1-4/7.7, 4-8-3/Table 2, 2008 MODU Rules: 43-3-3/Table 1
PQube Compliance

PSL Modbus Client (with Data Logging)

Pick among hundreds of real-time meters, strip charts to show on your screen. Includes links to dozens of PQubes around the world, with real-time meters in Europe, Asia, North and South America.

Free Download

PQube Report Writer

PQube Report Writer accepts files recorded by any PQube precision power monitor. The output is a beautifully formatted Microsoft Word document. Optimized for Power Quality consultants, PQube Report Writer also remembers your list of clients and customers.

Free Download

MPMS by Adabel

Device configuration and downloading data without application software is one of PQube's great features. In large system environments, however, it has some drawbacks. While configuration and data download for a couple of devices can be easily done via web browser, this method of handling larger systems (tens or hundreds of devices) is rather time consuming. Adabel recognized the need for multi-PQube management software which can be utilized for automatic and simplified handling of device configuration, data download, archiving, and reporting tasks.

Visit Website Data Sheet

PQube DSS Platform by CN Rood

PQube DSS Platform is an easy to use, web based, multi-PQube data organizer. Using PQube DSS Platform gives numerous advantages like automatic download of multiple PQube data, centralized data access, logical and easy map view, and much more... PQube DSS Platform is compatible with PQube and PQube 3.
Visit Website Data Sheet

PQView® by Electrotek Concepts

PQview® is a multi-component software system developed by Electrotek Concepts® and EPRI® for building and analyzing databases of power, power quality, and energy measurements. PQView integrates data from digital relays, digital fault recorders, power quality monitors, smart meters, and SCADA historians into an open relational database.
Visit Website

groov by Opto22

Monitor & control multiple PQubes via Modbus/TCP from a groov mobile interface. groov brings PQube data from sensors, drives, meters, and thousands of other Modbus/TCP devices directly to your smartphone or tablet. It acts as a Modbus master and communicates directly with PQube over standard, non-proprietary Ethernet networks.

Visit Website Data Sheet

FREE software package from PSL - writes standards-based Reports.

  1. Accepts files recorded by any PQube precision power monitor (optimized for firmware 2.1)
  2. Output is beautifully formatted Microsoft Word document - modify any way you like.
    (Requires Microsoft Word 2007 or later. Does not work with Word 2003 - sorry...)
  3. Optimized for EN50160 Standards by default - easy to add your own standards and Norms
  4. Multiple languages: Comes with English, French, Spanish, German, Portuguese, Polish. Easy to add your own language.
  5. Optimized for Power Quality consultants - Remembers your list of clients and customers.
  6. You are the author. Your logo, your web site on every page of of every Report
  7. Yes, this powerful program is a FREE download!    

  8. Download Report Writer
    (12.6 MB - latest version - Report Writer Guide 3.0
Watch a fun video of the PQube Report Writer in action...

FREE firmware upgrade

Download the 2.1.8 firmware upgrade package, including firmware, setup file, and language packs (50 MB).
>> Video installation instructions

Package Includes

  1. Firmware
  2. Setup File

FREE Documentation

Download the Documentation Package

Package Includes

  1. PQube Manual 2.1
  2. What's New in 2.1?
  3. PQube 2.1 New Features Guide
  4. Firmware Upgrade Guide 2.1
  5. Application Notes
  6. Release Notes, etc...

FREE Software

Download your optional PQube support software.

Download Links

  1. NEW!  PQube Configurator Program 2.1.8
  2. NEW!  PSL PQube Modbus Demo
  3. NEW!  PQube Report Writer
Includes links to dozens of PQubes around the world, with real-time meters in Europe, Asia, North and South America.
  >> Free Download: PQube 2.1 Modbus demonstration program (Source Code)
PQube Configurator is a great way to create and modify your PQube's SETUP.INI file. Even easier than using a text editor!
  >> Free Download: PQube 2.1.8 Configurator Utility
Name 2D Drawings 3D Drawings



Current Sensing Modules

Ethernet Module


Power Supply Modules


Temperature/Humidity Probe


High Voltage DC Modules