The ability to quickly calibrate directly to DC and AC signal sources is a great advantage of Dewesoft, and will save you much time, and ensure better and more reliable data recording long into the future.
NOTE: This procedure is only available with ‘by two point’ scaling!
Calibrating to signal sources
In 2-point calibration, there are two other sets of buttons that will allow you to perform a more accurate calibration when you have access to a known signal source or load. Let‘s say that we have a load sensor that we want to calibrate to a known load. We want to enter two points - say zero (0 kg) as our first point, and twenty-five (50 kg) as our known second point.
The first thing to do is simply enter those two values in these boxes as shown:
Now, we need to apply the known zero (0 kg) load. When it stabilizes, press the left-most from the average button, and the software will sample the input for a short time, average the values that it receives, and then calculate the required number for the upper left box - First point.
Now apply the known 50 kg load, let it stabilize, and press the right-most from the average button (see picture on right). Dewesoft is now perfectly calibrated to your signal based on the known loads that you input. Note in the screen picture above that Dewesoft has automatically input the two values in the upper two boxes that it needed in order to achieve this calibration.
If you have an AC signal source, you should not use the from average buttons - use the from RMS buttons instead! Also, press the red-labeled RMS button below the graph to add the RMS values to the dynamic display.
Background to this example: Defined weight from 0 to 50 kg (= signal source) will be measured with an uncalibrated strain gage sensor (= sensor) connected to a DAQP-BRIDGE module (= amplifier with 0.5 mV/V range).