User`s guide

32
Bridge Balancing and Verification
Make sure then NI DAQ box is turned on before starting the VI. Adjust the measurement
time to 0.01 second on the LabVIEW program to view instant strain readings. Use the offset
potentiometer to adjust the output voltage to 2.5V, which is half of the output range.
Connect shunt resistors parallel to the active gauge, and observe appropriate change in
the strain reading.
Gently press on the tap of the can, and observe the strain readings change accordingly.
Take Measurements
Allow the amplifier to warm up for 5 minutes before taking measurements.
For each can, record strain readings for approximately 5 seconds before opening the can,
and stop the VI 10 about seconds after opening the can. Use 0.005 inch for thickness during
recording. After clearing out the beverage in the can and cleaning the can, measure the thickness
of the can wall with a caliper. Take the average value of three measurements. Adjust the data
according to the new thickness measurement.