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NanoVolt Amplifier NVM-01

NanoVolt Amplifier NVM-01 was developed for very high resolution measurements of the magnetic flux distribution in ion and electron beam magnets by digitizing and integrating the voltage signal from a moving wire or rotating coil in the working region of the magnet.
The magnetic flux in the region of interest sampled by the wire or coil can be measured very quickly compared to point-by-point magnetic field mapping.

NVM-01 is an ultra low noise amplifier module for sensitive DC/AC measurements and data acquisition systems. It is ideal as the input unit for measuring low noise and low impedances sources.

The Voltage Gain of the NVM-01 can be set from about 30k to 800k for input signals from +/-250uV down to +/-10uV and the frequency response can be set as dc to 10Hz or dc to 40Hz.
The equivalent input noise from 0.1Hz to 10Hz is <4nVrms.

Typical Applications

  • Vibrating wire and rotation coil magnetometry
  • Thermocouple thermometry

By using purpose shaped Coils the NVM-01 can enable the measurement of very small changes in magnetic flux in a region of interest, e.g.:

  • The technique of measuring the magnetic moment of a magnet by rotating it in a Helmholtz Coil and monitoring the Coil voltage can be extended to very low magnetic moments.
  • Low levels of magnetic content can be detected by moving material or items though an appropriately dimensioned measurement Coil. For “soft” magnetic materials the sensitivity can be enhanced by applying a dc bias magnetic field.
  • Fluctuations in the magnetic field near magnetically sensitive equipment or instruments can be measured with “Pick-up Coils” at the equipment or arranged in the Lab walls. The output signals can be used to correct the measured parameter or to drive active field cancellation coils
  • Geomagnetic magnetic field changes due to natural or induced changes can be measured with a Coil of dimensions and turns scaled to the anticipated rate of change in magnetic flux.
  • Low levels of magnetic field fluctuation or noise in nominally dc magnetic fields can be measured independently of the magnitude of the dc field value.

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