Dear sir,
I am writing this mail from Ankara,Turkey. We are two Ph. D. candidates at Gazi University. From your company we bought two accelerometers model 353B02 which has serial number of 112205 and also one force sensor model 201B03 and this one has serial number of 28995. These products had calibrated on 10/24/2006. However,to get measurements, from company National Instruments we bought NI9233 daq and NI USB 9162 arranger that is appropriate the daq talked above.We will use all these instruments in our experiments which are about the fracture modes of concrete under impact effect.
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Nowadays have been making pre experiments to get set-up procedure but as measured value from these instruments we get always the number start with 5.48.......Altough,we change the slope of calibration curve but the measured values change as the multitude of the value written above(divided or multipled values).
No matter the magnitude of the impacts,instruments show the mentioned value as if it is maximum. This is valid for the drop height of 20 cm and 50 cm. In original experiment a hammer of 5.25 kg will be free dropped of height of 50 cm. We do not think we reached maxium measurement capacity of the instruments. As software using NIDAQ and Labview Signal Express for DAQ. For hardware or software we want to know if there is any mistake have been done?What is the maximum value for the experiment value as voltage we wonder(as 5.25 kg dropped from 50 cm)? And lastly,to get measurements is there any document that will be guide to us(figure,project results or printed pages to follow during experiment)?
Erkan KANTAR
Civil Engineer
