SIM925 Octal Four-wire Multiplexer0 pages

Small Instrumentation Modules
SIM925 — Octal four-wire multiplexer

· Eight input channels
· Four-pole relay switching
· Selectable buffer for V-sense lines
· Rear-panel bypass for unlimited
daisy-chaining

· SIM925 ... $990 (U.S. list)

SIM925 Octal Four-Wire Multiplexer
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 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.

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.

Stanford Research Systems

phone: (408)744-9040
www.thinkSRS.com