DOES STRAIN GAGE RESISTANCE MATTER?

In this iNote video Darryl and Paul demonstrate using DAQ system 7100, StrainSmart® Data Acquisition Software and 350 Ω/5000 Ω C5K strain gage sensors why your strain gage resistance value matter?

With Advanced Sensors Technology foil strain gages available now with 5000 Ω, does it really matter which value you choose?

Well, like many choices in life, your resistance selection will involve trade-offs. Let's say you choose a higher strain gage resistance. It will provide lower current for equal bridge voltage, which results in less grid self-heating and potentially better resistance stability over time. In addition, there will be higher bridge output when bridge excitation is increased and the lead-wire resistance will have less influence.

StrainSmart® Data Acquisition Software:

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You need to be careful with strain gage resistance and a balancing circuit. If the balancing circuit is digital, then no issues, if the balancing circuit is analog, you will introduce non-linearity the severity of which gets worse as resistance of the gage gets closer to the resistance of balance resistor via which balance DAC is connected.