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The SIM925 is an eight input channel, four-wire multiplexer for
low-level signal applications. Kelvin-lead measurements are supported
with optional buffering of the two sense leads. The buffer can be
switched out to form a simple relay-based, 4-pole/8-throw switch.
Multiple modules may be cascaded allowing unlimited networking possibilities.
The digital control circuitry in the SIM925 is designed with a
special clock-stopping architecture in which the microcontroller
is turned on only when switch settings are being changed. This guarantees
that no digital noise contaminates low-level analog signals.
Settings may be changed from the front panel or through the remote
interface. The multiplexer settings can also be queried. If armed,
the module generates a status signal to alert the user of an overload
condition. The SIM925 can be operated outside the SIM mainframe
by powering it with its required DC voltages.
The SIM925 may be used directly with the SIM921
AC Resistance Bridge, SIM922A Diode
Monitor, or SIM923A RTD Monitor
to read many temperature sensors. It may also be used to route multiple
signal sources to a lock-in amplifier, thus automating signal recovery
tasks.
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