D-10 and OAT problem/question

[rv8bldr]

Hi

I finally got around to installing the OAT probe for my D-10 (not D-10A) in the tail of my RV-8. If anyone has been headfirst down the back of an RV-8, they'll know why it took me so long to get around to it

The problem is that upon power up, I am getting bizarre readings. Last night, the temperature in the hangar was 4C, and with a airport altitude of 380 'ish feet, this should result in a density altitude of around -640 feet. The D-10 was showing 65C and 1200 feet. So I adjusted the OAT through the menus down to 4C, and now it is showing a density altitude of (I think) 3200 feet (it was either that or 2300. Alzheimers...)

Any ideas ?

Mark
RV-8 C-GURV
http://rv8bldr.tripod.com

 

[dynonsupport]

Correct DA calculations do rely on the OAT, so we should get that working first.

First, make sure you have the right OAT. It should be p/n 100240-000, not 100433-001. This number is noted on the packaging and your shipping invoice. Additionally, if there is a small loop of black heat shrink tubing near the sensor end of the OAT wire, you have the wrong OAT.

If you believe you have the right OAT installed:

- Is your remote compass providing heading to your EFIS? If not, the OAT will not work right either. To test, wave a magnet around your EDC-D10. If the heading on the EFIS moves, then the remote compass is working.
- Did you turn on the OAT probe under the EFIS Setup menu?
- Does the OAT seem to respond to temperature changes?
- Have you updated the firmware on your EFIS without the EDC connected? If so, the remote compass and EFIS may have different versions of firmware on them. This can cause strange OAT results.

A final way to directly test the EFIS-D10 OAT (this test does not apply to the EFIS-D10A OAT):

With the power on and everything connected, measure the voltage between the red and blue wires. It should be about 5V. Measure the voltage between the yellow and blue wires. It should be about 1.6 V at 70ish degrees (room temperature).

 

[rv8bldr]

Thanks for the ideas !

Yes, I did update the EFIS without the remote compass attached. I'll try that first, then the rest of the ideas.

Thanks again,

Mark

 

[rv8bldr]

Re: D-10 and OAT problem/question - SOLVED

Woo hoo !

Sure enough, I had updated the D-10 without the remote compass attached. WHen I updated the firware last night, it worked perfectly.

Now, how come the remote wasn't attached? I had a wiring error on the back of the DB25 going into the back of the D-10. My drawing was right, however, my implementation was wrong.

Cheers

Mark