Appendix F. 8032 Multiplexer Manual; Theory Of Operation - Geokon 8025 Instruction Manual

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APPENDIX F. 8032 MULTIPLEXER MANUAL

The following Appendix includes excerpts from the Model 8032 Multiplexer manual that apply
to the Micro-800. A complete version of the Model 8032 Multiplexer Manual can be found at
WWW.GEOKON.COM.
F.1 THEORY OF OPERATION
The Model 8032 Terminal Board and Multiplexer expands the number of channels that can be
read by the MICRO-800 Datalogger, MICRO-1000 Datalogger or GK-403 Vibrating Wire
Readout Box. Channel switching is accomplished by mechanical relays mounted on the
underside of the circuit board and the transducer connections are accomplished by friction
locking spring-loaded terminals mounted on the top side of the circuit board.
There are two different varieties of 8032 board:
Terminal Board only – typically used in conjunction with a 4999 Manual
8032-E
Switch Box
Terminal Board with Multiplexer – typically used with the Micro-800 Datalogger,
8032-C
MICRO-1000 Datalogger or GK-403 Readout Box.
Two switching configurations are supported, 16 channels of four conductors or 32 channels of
two conductors. For the 8032-C, these configurations are set by a DIP switch on the top side of
the circuit board. A second DIP switch selects whether the 8032-C is being used with a
datalogger or GK-403 Readout Box. For the 8032-E, these configurations are determined by the
4999 Manual Switch Box.
To protect against lightning or EMI/RFI induced transients, each channel is protected by an
integrated lightning protection system, incorporating 230V tripolar plasma surge arrestors, 150V
bipolar plasma surge arrestors, 10uH inductors and 16V transient voltage protection diodes. See
Appendix A for complete specifications on these components.