Is that OK to power up SCC-SG01/S​C-2345 with no signal connected?

A dumb question from first time user:
From the specification of SCC-SG01, the voltage input range is -100mV
to 100mV. But if no signal/sensor is connected to SCC-SG01, is that
equivelent to RG = infinite so that voltage input becomes 2.5V/2 =
1.25V which exceeds the limit?

Hello,
You are correct.  The signal would be floating at 1.25 Volts, which would cause your measurement to rail at 100 mV.  The SCC-SG01 has over voltage protection up to 28 V, so 1.25 V will not damage the module.
Please see the SCC-SG Series Strain-Gauge Modules User Guide for more details at:  http://digital.ni.com/manuals.nsf/websearch/876393​DF257DB5B086256E55005A51CE
I hope this helps.
Regards,
Sean C.

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