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CM3 Current Data Acquisition


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current data logger
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The PicoLog CM3 Current Data Logger is a compact, easy-to-use data logger for measuring the current consumption of buildings and machinery.

CM3 Current Data Logger

The PicoLog CM3 is a three-channel data logger that uses industry-standard current clamps.  Simply connect to your PC via USB or Ethernet, run the supplied software and you can monitor and log current for a wide range of applications.  

  • Suitable for single or three-phase alternating currents
  • Non-invasive measurent 
  • High resolution and accuracy
  • No power supply required
  • USB and Ethernet interfaces
  • Run multiple units on a single PC


Typical applications

  • Mains current monitoring 
  • Three-phase load balancing
  • Long-term energy use recording
  • Energy and cost saving / ISO14001 monitoring
Flexible, expandable software included

Your PicoLog CM3 Current Data Logger is supplied with PicoLog data logging software. With PicoLog you can collect up to one million measurements, analyze them and then display the results in spreadsheet and graphical formats.

PicoLog can record data from multiple PicoLog data loggers at the same time. This allows you to collect up to 60 channels of current. You can even mix and match different PicoLog units to record a mix of current, temperature, voltage and other signals.

A software development kit (SDK) is also supplied. The SDK contains a range of software drivers and example code that you can use to write your own software or to use your PicoLog CM3 with third-party software such as LabVIEW.

Both PicoLog and the SDK are provided free of charge and updates can be downloaded for free.

Non-invasive current clamps

The CM3 measures current using industry-standard AC current clamps. These clamps have opening jaws so can be installed in seconds with no physical connection to high voltages. AC current clamps require no power supply or batteries so are ideal for long-term energy-use monitoring and logging.

Pico supply 200 A AC current clamps as standard. If you need to measure higher currents we will be happy to advise on suitable clamps for your application.

The CM3 is available on its own so you can add your own current clamps or as a cost-saving kit with three 200 A clamps included.
USB or Ethernet connection for local or remote logging

With both USB and Ethernet interfaces your PicoLog CM3 can be used in a variety of situations. If you need a portable instrument that can be used at various locations and is fast to set up and use, simply connect your laptop to the PicoLog CM3 by USB.  No external power supply is required as the CM3 is powered from the USB port.

Need to monitor a situation over a period of hours or days, or from a remote location? Plug your PicoLog CM3 into a spare port on your network and then access it remotely either from your LAN or over the internet. When using Ethernet the CM3 can be powered either by Power over Ethernet (PoE) or by using the USB connection just for power.


PicoLog 6 data logging software for PicoLog CM3

PicoLog 6 is a complete data acquisition software package for the PicoLog CM3 current data loggers. It provides a visual, easy-to-use interface for users to quickly set up simple or complex acquisitions, record, view and analyze data.
  • Real-time data collection and display
  • Visual logger and channel setup for easy configuration and viewing
  • Available for Windows 7, 8 and 10 (32 and 64-bit), macOS and Linux
  • Virtually unlimited logging capacity to PC
  • Robust database format minimizes data loss and corruption
  • Simple and complex programmable alarms
  • Up to 4 independent graph axes
  • Data can be exported as CSV, clipboard image and PDF
  • Supports multiple different PicoLog data loggers on the same PC


PicoLog CM3 Manuals

Resource Language Version Size Updated
Data Sheets:
PicoLog CM3 Data Sheet English 6 1 MB December 13 2016
User's Guides:
PicoLog CM3 User’s Guide English 2 249 KB June 28 2011
PicoLog User’s Guide English 5 2 MB February 17 2014
Programmer's Guides:
PicoLog CM3 Current Data Logger Programmer’s Guide English 3 201 KB June 30 2016
Quick Start Guides:
USB Data Logger Installation Guide English
中文 (简体)
7 400 KB January 17 2012
Press Releases:
PicoLog CM3 Press Release English 1 165 KB March 23 2012
Training Guides:
PicoLog Frequently Asked Questions English 2 932 KB October 10 2016


Current probes (clamps)

Clamp-on current probes or “current clamps” enable you to measure currents without breaking the electrical circuit. Current clamps are designed with jaws that can be opened, placed around the conductor and clamped shut to form a magnetic loop around the conductor.

Current clamps offer a safe, cost-effective, simple and accurate way to take current measurements.

Our range of current clamps can be used with PicoScope Oscilloscopes and PicoLog Data Loggers, as well all major brands of oscilloscopes and multimeters.


Product Price
200 A AC current clamp (4 mm)




Product Price
USB 2.0 cable, 1.8 m
USB 2.0 cable, 4.5 m

PicoLog CM3 Specifications

PicoLog CM3 Current Data Logger Specifications
Number of chanels 3
Range (voltage input) 0 to 1 V  AC RMS
Accuracy (voltage input)
< 200 mV  RMS
< 1 V  RMS

RMS Noise 60 µV
Resolution 24 bit
Conversion time per enabled channel 720 ms
Voltage input 1 V  RMS, 20 Hz  to 1 kHz
Input connectors 4 mm  sockets
Input impedance >1 MΩ, AC coupled
Overvoltage protection ±30 V  DC

PC Requirements
Minimum Processor: 1 GHz
Memory: 512 MiB
Free disk space: 32-bit: 600 MB, 64-bit: 1.5 GB
Operating system: 32- or 64-bit edition of Microsoft Windows XP (SP3), Vista, Windows 7, Windows 8.1 (not Windows RT) or Windows 10
Ports: USB 1.1 port or Ethernet.
Recommended Processor: 1 GHz
Memory: 512 MiB
Free disk space: 32-bit: 850 MB, 64-bit: 2 GB
Operating system: 32- or 64-bit edition of Microsoft Windows 7, Windows 8.1 (not Windows RT) or Windows 10
Ports: USB 1.1 (or higher), or Ethernet.

Operating environment
Temperature range
Humidity range

0 °C to 50 °C  (20 °C to 28 °C  for stated accuracy)
20% to 80% RH, non-condensing
Storage environment
Temperature range
Humidity range

-20 °C to 60 °C
5% to 95% RH, non-condensing

Physical Properties
Dimensions 184 x 135 x 36 mm  (approx 7.2 x 5.3 x 1.4 in)

PicoLog for Windows PicoLog data acquisition software can collect up to 1 million samples. Features include:
Multiple views - view data as a graph, spreadsheet or text
Parameter scaling - convert raw data into standard engineering units
Math functions - use mathematical equations to calculate additional parameters
Alarm limits - program an alert if a parameter goes out of a specified range
IP networking - transfer measurements via a LAN or over the Internet
Operating systems supported — Microsoft Windows XP (SP3) to Windows 10. Not Windows RT.
Full details on PicoLog
Software development kit Includes drivers and example code for various programming languages including C, C#, Excel and LabVIEW.

Language Support

Full support for English, French and German; menus only for Italian, Spanish and Swedish
User's guide
Programmer's guide
Installation guide

English, Français, Deutsch, Italiano, Español, 中文
English, Français, Deutsch, Italiano, Español, Svenska, Nederlandse, Dansk

Data sheet English中文 (简体)DeutschEspañolFrançaisItaliano
Additional hardware (supplied) USB 2.0 cable, Ethernet cable, user manuals, software CD-ROM
PC interface USB 2.0 (USB 1.1 compatible) or Ethernet
Power requirements Powered from USB port or Ethernet
Compliance European EMC and LVD standards
FCC Rules Part 15 Class A
RoHS compliant
Total Satisfaction Guarantee In the event that this product does not fully meet your requirements you can return it for an exchange or refund. To claim, the product must be returned in good condition within 14 days.
Warranty 5 years
  • Need to know a specification not listed here? - just ask


Order your PicoLog CM3

CM3 Logger (PP815)
CM3 Logger Kit  (PP803)
(Comprising CM3 Logger and 3 x TA138  200 A  current clamps.)

USA Office

Address: 1480 Gulf Road, Suite 837,
PO Box 1364
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027