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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.
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Typical applications

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


Screenshot of PicoLog 6 software in Windows, shows a graph of 3 current channels over time.

Flexible, expandable software included

Your PicoLog CM3 Current Data Logger is supplied with PicoLog 6 data logging software, available for Windows, macOS and Linux. With PicoLog 6 you can collect almost unlimited datasets, analyze them and then display the results in spreadsheet and graphical formats.

PicoLog 6 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 loggers to record a mix of current, temperature, voltage and other signals.

The PicoSDK, a software development kit (SDK) is also supplied. PicoSDK 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 MATLAB, C,C++, C#, LabVIEW, Python, VB, to name but a few. PicoSDK can be found on GitHub.

Both PicoLog 6 and PicoSDK are provided free of charge and updates can be downloaded for free.


Image shows a blue and black current clamp with jaws closed

Non-invasive current clamps

The PicoLog 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 PicoLog 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.


Image shows the rear panel of the PicoLog CM3 showing Ethernet and USB ports

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.

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

PicoLog CM3 Specifications

PicoLog CM3 current data logger specifications
Number of channels 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 +80 °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.
PicoLog languages Full support for — English, Français, Deutsch
Menus and dialogs only for — Italiano, Español, Svenska
Software Development Kit Includes example code.
Optional free software Drivers for Linux and OS X.
Documentation languages
User's guide
Programmer’s guide
Installation guide
English, Français, Deutsch, Italiano, Español, 中文
English, Français, Deutsch, Italiano, Español, Svenska, Nederlandse, Dansk
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

PicoLog CM3 Manuals

Resource Language Version Size Updated
Data Sheets:
PicoLog CM3 Data Sheet English 8 2 MB April 08 2019
User’s Guides:
PicoLog CM3 User’s Guide English 5 3 MB May 20 2019
Programmer’s Guides:
PicoLog CM3 Current Data Logger Programmer’s Guide English 3 201 KB June 30 2016
Quick Start Guides:
USB Data Logger Quick Start Guide English
8 1 MB January 17 2012
Press Releases:
PicoLog CM3 Press Release English 1 165 KB March 23 2012
Training Guides:
PicoLog Frequently Asked Questions English 3 932 KB April 05 2019
PicoLog CM3 EU Declaration of Conformity English 2 417 KB November 01 2018