Blocking Out 100Hz EMI in the Lab

Thread starter gareth
Start date Apr 28, 2008
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Noise

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SUMMARY

The forum discussion centers on the challenge of blocking 100Hz electromagnetic interference (EMI) in a lab setup involving an ion source and a passive circuit. The user, Gareth, has implemented coaxial cables with copper tape shielding, which has reduced noise but not eliminated it, particularly when a 25V DC power supply is connected. Suggestions include using capacitors across the power supply output, exploring differential amplifiers, and considering battery power for the ion measuring device to mitigate noise issues. The discussion emphasizes the importance of grounding, shielding techniques, and the potential need for active amplification to improve signal clarity.

PREREQUISITES

Understanding of electromagnetic interference (EMI) and its effects on electronic circuits.
Familiarity with coaxial cable shielding and grounding techniques.
Knowledge of signal processing concepts, including filtering and amplification.
Experience with ion source operation and transient signal detection.

NEXT STEPS

Research "differential amplifiers" for improved signal clarity in noisy environments.
Learn about "active filtering" techniques to reduce EMI in electronic circuits.
Investigate "battery-powered measurement systems" for reducing noise from power supplies.
Explore "Faraday shielding" methods to enhance electromagnetic compatibility in lab setups.

USEFUL FOR

Electronics engineers, lab technicians, and researchers working with sensitive measurement equipment in high-noise environments, particularly those dealing with ion sources and transient signal detection.

May 2, 2008

f95toli

Science Advisor

Do you need to control it via a computer?
if not, 3x12V lead-acid batteries and one potentiometer would work.
Although personally I would use a single operational amplifier feed via a voltage reference instead, that way you can be sure that the voltage does not vary over time as the batteries are discharged.
Both circuits are very easy to build (the first one is just a single component+leads).