The Yocto-milliVolt-Rx device is a high accuracy USB voltmeter. It lets you measure by USB very small voltages (down to a few dozen of microVolts, and up to 2V max), even when they are generated by extremely weak sources (very high impedance).

Typical applications include measurement of electro-chemical reactions (e.g. pH and redox probes), low-voltage sensors (e.g. gaz sensors, etc), or Wheatstone bridges (e.g. load cells, etc). It is also possible to use this device to accurately measure the voltage drop across a shunt to measure high currents.

The input circuit of this device uses a very low bias current amplifier (typ. 0.2 pA). The measure circuit is electrically isolated from the USB bus, which makes it possible to measure grounded voltages without risk of creating a ground loop.

For measuring the weakest signals (e.g. pH measurements), we recommend to use the BNC variant of this product, which features a BNC connector to use with coaxial cable, to avoid electromagnetic interference.

This device can be connected directly to an Ethernet network using a YoctoHub-Ethernet, to a WiFi network using a YoctoHub-Wireless-n and to a GSM network using a YoctoHub-GSM.

Yocto-milliVolt-Rx Yocto-milliVolt-Rx Yocto-milliVolt-Rx

USB cables and enclosures to be ordered separately.

CHF 56.10

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Hardware release:Rev. C
Product name:Yocto-milliVolt-Rx
USB connector:micro-B
Input bias current (typ.):< 1pA
Refresh rate:100Hz
Input impedance:> 1000GΩ
Measuring range:-1000 ... +2000mV
Protection class, according to IEC 61140:class III
USB isolation, dielectric strength:1kV
Normal operating temperature:5...40░C
Extended operating temperature2:-30...85░C
Supported Operating Systems:Windows (PC + IoT), Linux (Intel + ARM), macOS, Android
Drivers:Driverless, no driver needed
API / SDK / Libraries:C++ Obj-C C# VB.NET UWP Delphi Python Java Android LabVIEW
API / SDK / Libraries (TCP only):Javascript Node.js PHP
RoHS compliance:RoHS III (2011/65/UE+2015/863)
Suggested enclosure:YoctoBox-Short-Thick-Black
Harmonized tariff code:9032.9000
Made in:Switzerland

1 These specifications are for the current hardware revision. Specifications for earlier revisions may differ.
2 The extended temperature range is defined based on components specifications and has been tested during a limited duration (1h). When using the device in harsh environments for a long period of time, we strongly advise to run extensive tests before going to production.

Accessories and related products

YoctoBox-Short-Thick-Black, Enclosure for Yoctopuce device (short, thick, black)USB-A-MicroB-50, USB 2.0 type A to Micro-B data cable, 50 cmYoctoHub-Ethernet, Ethernet-enabled hub for Yoctopuce modules

Related articles and application examples


User manual (HTML)
User manual (PDF)
Product brief
3D file (STEP)
RoHS certificate
Most recent firmware52889 (01/25/2023)
Programming libraries61813 (07/05/2024)
Command line API61813 (07/05/2024)
VirtualHub application61813 (07/05/2024)

Add a comment 5 comments

1 - volt-win10 Saturday,july 28,2018 15H29

My Windows 10 computer does not recognize Yocto-milliVolt-Rx-USB.
I installed VirtualHub.windows.31315 (64bit).
Can you create a driver for Windows 10 and make the istallation instruction?

2 - martinm (Yocto-Team)Saturday,july 28,2018 17H18

@volt-win10: Our products don't need any drivers. Your Yocto-milliVolt-rx is supposed to work on any version >=Windows XP, including Windows 10 64bits, as soon as it it plugged. Make sure that you are using a proper USB cable, not a phone USB charging cable, then contact Yoctopuce support.

3 - gaz Wednesday,june 24,2020 11H44

Hi there I'm a newbie, and don't know much about this product.
My questions are:

I assume you plug it into your laptop usb port-- this provides the power to the device and also the means to access what is going on on the circuit board.

1. Where do the wires, which will serve as a voltage probe, connect to the circuit board? Where do I solder these wires onto the circuit board?

2. Can I write a Powershell program to monitor the voltage values given by the circuit board. Powershell has full access to the .NET classes (I think full access, unless it uses .NET core in which case it has access to a subset on the .NET programmable infrastructure.) My question is: Would I be able to import a module or dll ie. an assembly into Powershell, and use this module to access the voltage values output by the device? Thanks.

4 - mvuilleu (Yocto-Team)Wednesday,june 24,2020 12H03

@gaz: you would simply put the measurement wires in the terminal block, as illustrated in the user manuel (yes, we do provide a manual :-) Regarding access from PowerShell, you are perfectly correct: this can be done via the .Net proxy DLL, as described in this article: https://www.yoctopuce.com/EN/article/the-yoctopuce-library-as-a-net-assembly

5 - jayphotonics Thursday,july 01,2021 23H23

We used the Yocto-milliVolt to fabricate a prototype of a breathalyzer integrated in a smartphone screen. The Yocto-milliVolt work perfectly. Easy to use and implement. For more info, here is the article on the breathalyzer:

Thanks to you for making such great products!

Yoctopuce, get your stuff connected.