Source Measure Unit - X200

Order Code: P2005A2-UK
Price excludes taxes
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Source voltage, measure current, get data.

Whatever your experimental needs, the Ossila Source Measure Unit
will simplify & accelerate your data collection.

The ability to control instruments is a key skill for experimental scientists and engineers. We’ve designed the Source Measure Unit so that no matter what your skill level is, you can access affordable, precise instrumentation. Accelerate your data collection today with this high-performance, low-cost measurement equipment! 

The Source Measure Unit incorporates 2 voltage source meters for measuring current and 2 voltage meters for measuring voltage. With it, you can measure a wide range of research devices including photovoltaics, LEDs/OLEDs, transistors, and more. This product is covered by our FREE 2-year warranty.

Ossila Source Measure Unit


Five current ranges - Choose between five separate current ranges to suit your experimental needs (refer to specifications).

User-friendly PC software - The Source Measure Unit  can be used without any prior coding experience! The included PC software comes with pre-set modes, allowing you to perform simple measurements (e.g setting voltages, measuring currents). Data can be saved in csv format for convenient analysis.

Flexible & scalable communication - Connect the Source Measure Unit via USB or Ethernet. Several units can be used at the same time via Ethernet connection.

Software-controlled current ranges - For safety and convenience, the current range switches can be controlled using the included PC software - so there is no need for manual adjustment.

Wide language compatibility - All common programming languages (LabVIEW, Matlab, C, Java, Fortran, Python, Perl etc) are compatible with the unit.

Source Measure Unit (X200) diagram

Improvements (X200 vs X100)

Higher current measurement limits - The maximum measurable current has been increased in each of the five current ranges.

Convenient positioning of BNC connectors - To reduce the risk of cables getting tangled, the BNC connectors have been arranged in an intuitive sequence.

Durable, static-free casing - The source meter is protected from liquid spillage, dust, and electrostatic discharge by a robust enclosure.

source meter with test board
Ossila Source Measure Unit in use with an Ossila Push Fit Test Board (E401).
Please note: Laptop and testing board are not included with the Source Measure Unit.


You can use the Source Measure Unit in many applications, and some are mentioned below. Most lab-scale devices that require electrical characterisation in the DC (or low frequency) range (between ±10 V and ±150 mA per channel) can be measured with the source meter.

For complete 'out-of-the-box' measurements, please see the measurement systems on our Test and Measurement page. For guides on how to program the source measure unit, please see our Getting Started page. For programming in Python, please see our more extensive Scientific Python Tutorials.

Devices & Uses Example Measurement Types
Photovoltaics IV Curves, lifetime measurements, maximum power point tracking etc
LEDs and OLEDs IV Curves, Lifetime
Sheet Resistance 4-Point Probe

PC Front Panel Software

The Ossila Source Measure Unit includes a software Front Panel that enables you to start taking measurements as quickly as possible. With the program you can control each SMU and Vsense channel independently, allowing you to perform many of the most common electrical measurements.

Key Features

  • Set voltage and measure current with two independent SMU channels.
  • Measure voltages with the two Vsense channels.
  • Set sampling rates (OSR) for the SMUs and Vsense channels.
  • Save data within easy-to-use spreadsheet (.csv) or text (.txt) files.
source meter front panel
Ossila Source Measure Unit Front Panel PC Software

Other Software

We also have software for performing specific measurements with the Ossila Source Measure Unit. These can be downloaded for free from our software and drivers page. The currently available measurements are:

  • I-V curves
  • Solar cell characterisation and lifetime
  • Four-point probe sheet resistance


The source measure unit contains four instruments on one board - two SMUs (voltage source, current sense) and two precision voltage sense channels. There Is also a general-purpose shutter/trigger which enables it to control (or be controlled by) other instruments.

Source Measure Units (SMU 1 & SMU 2)

The SMUs output a voltage and then measure both the voltage and current. The output voltage is always measured on the output to the BNC, rather than assuming it is at the set voltage. This is to account for any load effects, for example, short circuiting the output, or low impedance causing a small drop in voltage. Each source measure unit has multiple current ranges, so that you can measure both large and small currents with accuracy.

Voltage source specifications:

Range Accuracy Precision Resolution
± 10 V 10 mV 333 µV 170 µV

Voltage measure specifications

Range Accuracy Precision Resolution
± 10V 10 mV 50 µV 10 µV


Current measure specifications.

Range Max Current Accuracy Precision Resolution
1 ± 150 mA ± 200 µA 10 µA 1 µA
2 ± 20 mA ± 10 µA 1 µA 100 nA
3 ± 2 mA ± 1 µA 100 nA 10 nA
4 ± 200 µA ± 100 nA 10 nA 1 nA
5 ± 20 µA ± 10 nA 1 nA 0.1nA


Precision Voltage Meter Specifications (Vsense 1 and Vsense 2)

The voltage meters are designed to accurately sense small voltages while also having a wide dynamic range (±10 V).

Range Accuracy Precision Resolution
±10 V 10 mV 50 µV 10 µV


The Shutter/Trigger can be used either as an input or an output. It can be used to send a trigger signal to other instruments or configured to wait for a trigger from other instruments. The voltage level of this BNC is 5V - any higher may cause damage to the port.

Programming Languages

The X200's user-friendly design will work almost any programming language (at least anything that supports either serial COMs or Ethernet, which is nearly everything commonly used). Common languages that can be used to interface to it are:

Physical Specifications

Computer Connectivity USB-B and Ethernet
Measurement Connections BNC connector
Dimensions Width: 125 mm
Height: 55 mm
Depth: 185 mm

Software Requirements

Supported Operating Systems Windows Vista, 7, 8, or 10
Minimum Monitor Resolution 1024 x 768
Minimum Processor (CPU) Dual-core
Required Hard Drive Space 116 MB

To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.