Description of conversion of an EG&G VMCM into a MVMS (multi-variable moored sensor)

Miguel Maccio, Chris Langdon

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A standard EG&G VMCM (vector measuring current meter) has been modified to acquire data from external sensors. The external sensors are mounted on a compact backpack which attaches to the VMCM's cage. Some simple changes to the VMCM's A/D (analog/digital) board opened up eight analog voltage channels. Changes to the VMCM's firmware were made to allow control over the period of time between toggling external power on and the A/D sampling cycle. Some sensors with low power consumption were powered continuously and their signals passed through a low-pass filter to match time constants and minimize aliasing. Sixteeen VMCM's were modified and three deployments of these MVMSs (multivariable moored sensor) were made in 1987 with durations of 3 to 4 months as part of Biowatt (Bioluminescence and Optical Variability in Sea) II. Data return was better than 80%. Reasons for loss of data include tape breakage, underwater connector failure, pressure case flooding, and fouling.

Original languageEnglish
Title of host publicationUnknown Host Publication Title
Place of PublicationPiscataway, NJ, United States
PublisherPubl by IEEE
Number of pages7
StatePublished - Dec 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)


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