Testing
A quick test is recommended. Attach some voltage or signal to the summer inputs and measure all
outputs.
Calibration
For calibration you need a DC voltage source of about 10V. The exact value is not important,
anything between 9 – 10V is fine. You can also use a lower voltage, such as 5V, but that may result
in a more difficult calibration.
Attach the voltage source to the first summing inputs and measure the voltage between
the input and the summer output with a multimeter, preferably in mV range.
Adjust the trimmer on the PCB until the voltage reads as close to 0V as possible.
The three summing inputs will have slightly different gains (variation of maximum 0.05%),
so it is recommended to try all three inputs and minimize the total error.
