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== Procedure to calibrate or recalibrate your WBO2 controller built-in to VEMS V3 == These are included during v3 assembly. It can be useful for debugging if something is wrong. Check WBO2 + supply and other wiring (the most common mistakes). '''wbo2_pump_pw_zero''' and '''wbo2_nernst_dc_target''' board calibration values are the results from these adjustments * Connect '''pump(-)''' and '''nernst''' with 100 Ohm * connect '''nernst''' and '''pump(+)''' with 100Ohm too. * Connect a LED's cathode to Heater(-). ** Anode with series 500 Ohm to 12V http://www.vems.hu/files/widebando2/wbo2controller_test.png '''Verify Pump-''' *First Measure the voltage between the GND and Pump(-). It should be appr +4V (3.85 - 4.15V) '''Measure Pump+ and Adjust Pump-pw-zero ''' * Measure the voltage between '''pump(-)''' and '''pump(+)''' ** DVM's COM (black) = Pump(-) ** it should between -4mv and +4mV, when wbo2 is off. If the voltage not in the specified range, adjust pump_pw_zero variable '''Verify Heater''' * turn on the wbo2 (mde02 in the terminal, or WBO2 calibration wizard in VemsTune) ** The LED should start lighting. '''Nernst-DC target''' * Connect DVM's (+) to '''nernst''' ** note: DVM reference (-) is still on pump(-) ** after a while, the voltage should rise to +450mV. Adjust wbo2_nernst_dc_target variable to get close. ** optional step: Switch to the display's 7th page (Terminal: mlp07). Check Ri(Top left corner), it should between 90 and E0.
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