How the MeasureReady™ 155’s in-phase AC reference benefits small AC signal measurements

Since introducing our MeasureReady™ 155 precision current and voltage source, we continue hear feedback about how it benefits certain types of measurements. One of these is small AC signal measurement.

The reason is, for the AC output the instrument provides an in-phase AC reference, making the 155 ideal for use with a lock-in amplifier when detecting extremely low signal levels in the presence of other signals.

AC Reference Output on 155 Current and Voltage Source

This output provides the 155 source a convenient way to sync up with a lock-in amplifier to permit the detection of small AC signals in the presence of other noise sources—a scenario that is common for semiconductor device measurements and other types of material research.

In-Phase AC Signal Reference Output of 155 Current and Voltage Source

In-phase AC signal reference output supplied by the MeasureReady 155 for use with lock-in amplifier measurements

Common small signal characterization applications where a lock-in can be very useful include:

  • Measuring resistivity/conductivity of very high- or low-resistance materials
  • Performing Hall effect measurements on low-mobility materials
  • Measuring very low gate/channel leakage currents in FETs or any kind of transistor, including HEMTs, BJTs, HBTs, and MESFETs at <100 kHz.

Small signal measurements also benefit research into quantum systems and devices, including:

  • Characterizing spin orbit torque
  • Measuring kinetic inductance of superconductor superfluid densities
  • Characterizing unconventional quantum-limited electronic devices, such as graphene FETs, monolayer and multilayer MoS2, and tunnel FETs.

For more about the source’s performance, how it’s ideal for scientists and material researchers requiring a precise, low-noise supply of current or voltage in the lab, and its simple, intuitive interface, visit the MeasureReady 155 webpage.

 Download the 155 current source and voltage source app from Google Play  

Also now available: a free app that enables you to conveniently operate the MeasureReady 155 remotely from your Android device (installable from Google Play). The app mirrors the 155’s front-panel interface.

Try the MeasureReady 155 risk-free

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Tags: current source, small signal measurement, lock-in amplifier

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