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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: We have a common re-occuring problem reported with the RPM input. The customer reports (from http://vems.hu/www.vems.co.uk/forum/index.php?topic=256 ) "I am feeding the RPM input with my function generator. Nothing else is connected. The dips come sporadic. Sometimes the RPM display is stable up to 20 seconds, sometimes they appear after 1 second. The input signal and the pullup resistor on pin 11 has no influence on the dips. The dip shows a RPM which is about a factor of 2,5 lower (2205 instead of 5555rpm or 1151 instead of 2860 ...). I think the dip is not a problem of the input signal, it must be a firmware problem (missing int or something like this). To understand more of the analog and rpm input, a schematic would really help. * the RPM input is divided internally towards 5V, so about 0.6V on RPM input will be about 2.8V internally, equal the RPMref threshold. * RPMref (often around 2.8V), can be changed with pulldown resistor to GND, or pullup to eg 4V * note that we suspect the dip might be calculation (rounding/overflow) problem, not analog. We are looking into it. I have the newest firmware (round_2007-04-25). I don't use signalgen.exe. I feed the rpm input with a square wave signal (0 to 12V/ duty cycle 50%) from an external generator." Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.