Testing the v3.3 units purchased recently (#316, #317, #328 & #360) with this: http://www.mmcompsys.com/download_zone/6_sensors/SEN.pdf Magnetti Marelli sensor - which is a common sensor used by the likes of Omex and MM themselves. Its resistance was measured at ~620Ohms. A scope trace shows a good AC signal ~(+/-10V)
All have been loaded with firmware v1.0.23 and the same config (from MembersPage/JimW/ExampleConfig ).
- 316 (primary&secondary VR) and #328 (VR primary/Hall Secondary) read the engine speed perfectly, #317 & #360 show no engine speed.
Marcell has suggested I test the resistor at Pin7 of LM1815.
What am I looking to test? Voltage, or resistance.