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

[gangmei]

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?

[Sean_C.]

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/876393DF257DB5B086256E55005A51CE

I hope this helps.

Regards,

Sean C.

[gangmei]

That is really helpful and now I dare to plug in power:-)

Thanks a lot.