Designed for scientists and engineers working on the next generation of electronic devices, the Ossila Source Measure Unit is one of our most adaptable and fundamental pieces of equipment.

Measure the I-V characteristics of many devices including photovoltaics, LEDs and OLEDs, transistors, and more. 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.

We have used our SMU to develop the Ossila Four-Point Probe to measure sheet resistance, our Solar Cell IV Test System and LED Measurement System to measure IV curves and characterize solar cells and LEDs, and the Ossila Potentiostat for cyclic voltammetry.

Specifications

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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	Accuracy1	Precision2	Resolution	Burden
1	±200 mA	±500 µA	10 µA	1 µA	<20 mV
2	±20 mA	±10 µA	1 µA	100 nA	<20 mV
3	±2 mA	±1 µA	100 nA	10 nA	<20 mV
4	±200 µA	±100 nA	10 nA	1 nA	<20 mV
5	±20 µA	±10 nA	1 nA	0.1nA	<20 mV

1Accuracy has been measured at the maximum current of the range.
2Precision has been measured at the highest OSR (9).

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

Shutter/Trigger

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 5 V because any higher may cause damage to the port.

The front panel of the Ossila Source Measure Unit highlighting the SMU and Vsense channelsOssila Source Measure Unit wireframe

Physical Specifications

Computer Connectivity	USB-B and Ethernet
Measurement Connections	BNC connector
Dimensions (W x H x D)	125 mm x 55 mm x 185 mm (4.92" x 2.17" x 7.28")