LEMI-424 Magnetotelluric Data Acquisition System

• Type Name: Magnetic Field/Electric Field Instruments
  Type Identifier: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/bb175474-5e70-47be-8e1f-8dcd7563cc5b
  Type Identifier Type: URL
• Type Name: Magnetotelluric data acquisition system
  Type Identifier: https://pidinst.data.auscope.org.au/taxonomies/term/a2fb0e94-3bd0-4c51-b1f1-b2fcf58d8d37
  Type Identifier Type: URL

• Owner: Adelaide University
  Owner Contact: graham.heinson@adelaide.edu.au

• Manufacturer: Laboratory of Electromagnetic Innovations (LEMI)

• Model Name: LEMI-424
  Model Identifier: https://lemisensors.com/?p=500
  Model Identifier Type: URL

• Date: 2017-03
  Date Type: Commissioned

• Variable Name: MAGNETIC FIELD
  Variable Identifier: https://gcmd.earthdata.nasa.gov/kms/concept/204b482b-449b-42c9-a5bb-f6da42bee3a4
  Variable Identifier Type: URL
• Variable Name: ELECTRICAL FIELD
  Variable Identifier: https://gcmd.earthdata.nasa.gov/kms/concept/3202dab6-144a-4bfb-9bda-9d07e5ee7ec2
  Variable Identifier Type: URL

• Magnetotellurics
• MT
• Passive EM
• Electromagnetic Sounding
• Long-period MT

The LEMI-424 is a long-period magnetotelluric (MT) acquisition system designed for recording low-frequency natural electromagnetic field variations for deep crustal and lithospheric imaging. The system comprises a high-resolution data logger and a three-component analogue fluxgate magnetometer, providing four magnetic and four electric input channels with GPS time synchronisation. High-input-impedance, low-drift analogue front-end electronics and a DC-coupled signal path enable measurement of ultra-long-period signals without high-pass filtering, supporting periods extending to approximately 100,000 seconds. The LEMI-424 is widely deployed in long-period MT surveys, such as AusLAMP deployments, where its low-noise performance, low power consumption, and rugged field design enable continuous autonomous operation over extended deployments. This instrument instance forms part of the AuScope - ANSIR: Research Facilities For Earth Sounding and has been deployed in multiple research surveys across Australia.

• Funder: AuScope

• Alternate Identifier Type: Serial Number
  Alternate Identifier: #0059