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Related Experiment Video

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Measurement of Bioelectric Current with a Vibrating Probe

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Published on: January 4, 2011

Electrometric direct current I/V converter with wide bandwidth.

S Holt¹, P Skyba

¹Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom. skyba@saske.sk

The Review of Scientific Instruments

|July 5, 2012

Summary

This study presents a high-frequency current-to-voltage (I/V) converter suitable for low-temperature physics applications. The I/V converter offers selectable gains and wide frequency ranges for precise electric current measurements.

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Area of Science:

Low Temperature Physics
Electrical Engineering
Measurement Science

Background:

Accurate measurement of electric current is crucial in various scientific disciplines, particularly in low-temperature physics.
Existing current-to-voltage (I/V) converters may have limitations in frequency range or gain selection for specific applications.

Purpose of the Study:

To present the operating principle and electrical characteristics of a novel high-frequency current-to-voltage (I/V) converter.
To highlight the suitability of the developed I/V converter for diverse applications in low-temperature physics.

Main Methods:

Detailed description of the I/V converter's design and operational principles.
Characterization of the I/V converter's electrical performance, including selectable gains and frequency response.
Analysis of the influence of input impedance on measurement precision.

Main Results:

The I/V converter provides selectable gains of 10^5, 10^4, and 10^3 V/A.
Achieved frequency ranges are DC to 500 kHz, 1.2 MHz, and 2.4 MHz, respectively, for the different gain settings.
Demonstrated suitability for applications including tuning forks, torsion oscillators, and piezoelectric transducer detection.

Conclusions:

The developed high-frequency I/V converter is a versatile instrument for precise current measurements in low-temperature physics.
Its selectable gains and broad frequency response enable its use in a wide array of sensitive experimental setups.
Understanding input impedance effects is key to optimizing measurement accuracy.