Dave explains errors and problems associated in insulation resistance measurement through a relay test matrix. Betcha no one else has that covered on Youtube!
Eevblog #38 2of2 – seismic survey boats relay matrix insulation resistance measurement
ByYTB
Oct 16, 2009
interesting
"switches in the matrix" nice nice nice
every whale or dolphin within earshot must be deaf after this tow ship sails through
i would have attached Analog to Digital Converts to every one of those mics and digitized the signel rather then have a low current go through that long of a cable
This one was only a low level of around 5-10V for IR. The hydrophones would actually be damaged at 50V. Another model of the system used 500V for the power wires as well.
One-man-band design team. Designed, Checked, and Approved by me :->
Probably spread over 6 months and went though many design and goal post changes.