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Thanks Todd
Steve
> On 24 Jun 2018, at 6:23 am, Andrew Martin andrew@martinag.com.au <flyrotary@lancaironline.net> wrote:
>
> Thanks Todd. This is very good info for making the EM2 just that bit more user friendly for me. Is your airspeed cal in mph or knots?
> Andrew
>
> On Sun, 24 Jun 2018 at 5:59 am, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:
> Below is my EM2 calibration data table. I hope it comes through to the list OK, otherwise I'll post a link.
> The only Dynon I have is the D10A, which is just flight instruments, so other than sharing a pitot probe there is nothing common. The Dynon has it's own OAT sensor which is connected through the EDC magnetometer (electronic compass)
>
> EM2 Calibration Data
> Ch. # Function Scale Factor Zero Offset Sensor Offset Low Limit Hi Limit sensor type location
> 0 H2O temp 3.152 20 447 100 VDO 323 095 H2O out of engine, before cooler
> 1 Aux air 2 3.6 0 69 LM34DZ behind right radiator air
> 2 aux LT 1 1.825 20 490 VDO ? 323 057 Oil Sump, before cooler
> 3 RT fuel 0.572 511 756 SW F-385C Right Outboard tank
> 4 oil temp 3.219 20 445 90 VDO 323 095 Oil into engine, after cooler
> 5 LT fuel 0.784 511 828 SW F-385B Left Outboard tank
> 6 aux air 3
> 7 aux LT 2 3.114 20 446 VDO 323 095 H2O into engine, after cooler
> 8 oil press 9.436 0 55 25 95 VDO 360 086D Oil into engine, after cooler & filter
> 9 H2O press 32.211 0 88 21 VDO 360 043 Coolant swirl bottle
> 10 aux air 1 8.105 0 176 LM34DZ behind left radiator air
> 11 OAT 8.666 0 439 LM34DZ under right wing root
> 12 fuel press 13.7 0 99 VDO 360 086 fuel rail loop
> 13 mixture 5.119 0 0
> 14 air speed 10.008 0 46 45 200
> 15 altitude 3.598 -50 7542
> 16 CHT 1 0.454 0 J type TC fuel filter/water seperator
> 17 CHT 2 0.454 0 J type TC MOCAL oil inlet
> 18 CHT 3 0.454 0 J type TC MOCAL H2O inlet
> 19 CHT 4 0.454 0 J type TC various, currently cowl air out
> 20 EGT 1 1.046 0 950 K type TC Rotor #1 exhaust
> 21 EGT 2 1.046 0 950 K type TC Rotor #2 exhaust
> 22 EGT 3 1.046 0 950 K type TC TIT, turbo inlet
> 23 EGT 4 1.046 0 500 K type TC exhaust pipe 30" downstream of turbo
> 24 MAP 13.639 30.029 371
> 25 voltage 6.277 10 0 130 155
>
> The temp sensor that is in the oil sump (aux LT 1,channel 2) has far different cal data as the other VDO temp sensors. I'm not sure where I got it from and it has no markings on it, but it's ohmic range matches the published data for a VDO 323 057 (max 150C), so I'm assuming that is what it is, but take that one with a measure of skepticism. It calibrated fine so I'm using it for now, but my next order from ACS will include a new VDO 323 095, to match the others.
>
> Todd
>
> Todd Bartrim
>
> On Sat, Jun 23, 2018 at 4:42 AM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
> Hi there Todd
> I’d be very interested in the settings though I have an EM3 and I’m not sure of the difference between models 2 and 3.
> Do you have all seperate senders for the Em2 and Dynon?
>
> Steve Izett
>
>
>
>
> > On 23 Jun 2018, at 5:33 pm, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:
> >
> > Ok, as I can never leave well enough alone, I took another look at this.
> > First as soon as I took a moment I realized that the J&K thermocouple would be real easy to calibrate and convert to metric.
> > I used a Fluke temperature calibrator with a millivolt output to simulate the TC"s. Worked like a charm.
> > I tried to use the same calibrator to simulate the variable resistance of the VDO probes, but they are thermistors which are very non-linear, so even with the tables it was a challenge.
> > So I brought home a Fluke 9009 dual dry block temperature calibrator. Good for -20°C up to 350°C at the same time (separate temp wells).
> > That made it easy, fast and very accurate.
> > However, the one that I'm worried about is the OAT as this one is also used to calculate TAS, HP, and "other readings".
> > Now I believe I can correct the TAS by calibrating the scale factor on the airspeed in flight against the TAS on my Dynon.
> > HP is an arbitrary number anyways based on what I think my max HP should be. I think I can tweak that factor as well to get it back to what I think it should be. And if I ever meet a Dyno I'll be sure to try to calibrate it properly.
> > But the manual also mentions "other readings" without details.
> > So I've put in an email to Tracy.
> > If it turns out to be important, I can always put this one back and just ignore the OAT. (Its also on the Dynon)
> > So if any of you metric blokes down under would like to do this, I can post all the parameters which you can input to your own EM2 and it will get you close.
> > For very accurate calibration you would have to tweak them a bit using a temperature calibrator.
> >
> > Todd
> >
> > On Fri, Jun 8, 2018, 00:46 Todd Bartrim bartrim@gmail.com, <flyrotary@lancaironline.net> wrote:
> > Hi Andrew;
> > I haven't spent much further time on the metric conversion. I think it wouldn't be as simple as I hoped. It was fairly straight forward to convert the fuel level to litres and most of the temp measurements should be almost as easy, but the K & J thermocouples have different raw data, that I don't believe would be easy to convert. And then some of the calculated parameters will likely be adversely affected as well. Probably not impossible, but first, I just don't have the time and second, I would probably have to be bugging Tracy a lot for info and he's busy being retired in the mountains of Colorado where he seems to be online only occasionally.
> > I have however longed for a data-logger which the early EM2 didn't have (I have #003). With the increasing popularity of hobby microcontrollers I can get a Ardurino microcontrollers for $35 and a datalogger for it for $6, so I just asked Tracy about the possibility of harvesting data from the EM2.
> > However for a few other reasons, I'm considering that next time someone on the list is selling an EM3 from an abandoned project, I might buy it for an upgrade. I think there was one recently but it was bought up right away.
> >
> > Todd Bartrim
> >
> > On Thu, Jun 7, 2018 at 7:58 PM, Andrew Martin andrew@martinag.com.au <flyrotary@lancaironline.net> wrote:
> > Todd, did you ever get the EM2 recalibrated to metric? I never attemped this as doing so usually gives me quite a few hours work to get back to a working system. I used Tracy’s factory calibration in the EM2 as the base to calibrate my efis, which is in metric. It is a minor inconvienience to do the mental arithmetric when comparing instruments, but would be interesting to know if you succeeded.
> > --
> > Regards Andrew Martin Martin Ag
> >
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
> --
> Regards Andrew Martin Martin Ag
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