VWP Indicator Q&A
Question: I'm repairing a jumper cable for the VWP Indicator. What are the pinouts?
Question: We have been using the "microstrainVS" setting rather than "microstrainVW" to read VW spotweldable strain gauges. How can I convert these VS readings to the correct microstrainVW readings?
Answer: The data can be converted without too much difficulty. The main problem is that the VS readings used a 2nd order equation, consequently you will need to solve a quadratic equation using the following formula:
Hz = SQRT(711.09 * VS + 6783) - 82.4 (where VS is the microstrainVS reading)
Then, to convert the result to the correct microstrainVW reading, use the formula below:
uStrain = (Hz^2 / 1320) - 2030.1
For your convenience, we've made an Excel worksheet that provides these equations. The file is called VS2VWmicrostrain. You'll need an UnZip utility to access the file.
Question: I've been recording piezometer readings using the microstrain setting. How can I convert microstrain to Hz?
Answer: We've made an Excel worksheet for this. The file is called strain-to-hz-xls.zip. You'll need an UnZip utility to access the file.