I think the look-up table would give, in theory, a far more accurate result. I had considered making one up myself but found using off the shelf thermocouples, the offset required daily adjustment depending on ambient as you have pointed out. So opted to take advantage of the K type linearity output...

FioranoCars wrote:I guess I should try tapping into a sensor on a car's exhaust to prove it... that'll be this afternoon then!

FioranoCars wrote:I'll post a waveform data file a bit later showing the readings I get from the thermo sensor.

Any update/images on this yet?

FF

Thanks Rob i just measured a few plugs most standard 14mm plugs have thread length of about 17mm.

The O'ring once rolled off will allow a collar to be removed allowing a longer thread. With collar removed you have 19mm less O'ring.

HTH
FF

... but I think I can answer that now for myself! The Pico 4x23 scopes have a resolution of 10mv, where a k type probe has a Thermoelectric Voltage in Millivolts (ie the output) of -2.2mv at -50degC to 0mv at 0degC to 4.1mv at 100degC to 10mv at about 250degC and about 20mv at 500degC. So based on ...

That probe is for a direct connection to a K type thermocouple. I had assummed (possibly incorrectly) the connector made up some sort of referance/cold junction. As I'm able to measure a voltage at room tempreture. I'm not sure what causes that junction although it can be worked out and that is what...

Check your email. Probe sent. Best do some calibration tests first. The zero compensation may need adjusting but should be accurate to a couple of degrees. Keep sample rates low and be prepared to filter the results. From the few runs I have done using that probe (EGT's 700*C +) the results are good...

Sorry was the forth pin after the missing tooth on the pick up on the crank

That explains what I see'd.


FF

As he said. Need the file.

That screen image may have just missed the money shot. Looks like the VRS amplitude reduces further (last switch).
Can't add any more to that.

HTH
FF

I hold my hands up on this one as I don't know how to set the scope up to measure Hz? On the tool bar you have your channel. Beside that you can select the range you want and beside that is your selected coupling. You will find it here. You have the choice of AC or DC coupling or Frequency. I think...

I'm not sure of your set up: A - signal (20:1 attenuator selected) B - Primary ( +/- 20v selected) C - Your power supply is being pulled closer to gnd than the primary :?: D - Not sure what was going on there but you could of just used 'Secondary ignition probe (Pos)' No need for Math channel. Also ...