Theory Of Operation - Geokon 8032 Instruction Manual

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
8032-C
Datalogger, MICRO-1000 Datalogger or GK-403 Readout Box.
Two switching configurations are supported, 16 channels of 4 conductors or 32 channels
of 2 conductors. For the 8032-C, these configurations are set by a DipSwitch on the top
side of the circuit board. A second DipSwitch 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.
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