PA calibration

[alainrac]

Is there a way to calibrate admission pressure to match the altimeter when engine out? today, it was std on the altimeter (29.92) and it was more on the PA value... nothing in the manual it seems?

 

[Rhino]

I don't understand the question. What is admission pressure?

 

[RV8JD]

If I understood your question correctly (and I may not have), Yes there is a way to adjust Manifold Pressure (MP) in the SkyView. MP can be adjusted +/- 0.5" Hg.

Choose/Highlight the MP sensor (Pressure Sensor 100434-000) in the Sensor Input Mapping screenshot below:

And then touch on the Sensor number (100434-000) and pick which adjustment you need. I needed -0.5" HG (as shown in the screenshot above).

The traditional quick check of your MP gauge is to set field elevation, note the value in the Kollsman window, and subtract 1" Hg per 1000 feet above sea level. For example, if your field elevation is 200 feet set 200 feet on the altimeter, then subtract 0.2 from the Kollsman. In theory, if the Kollsman said 29.92, the MP gauge should read 29.72.

Like any rule-of-thumb, it's not super accurate, just close. The answer will be as much as 0.1" Hg too high below 6000 feet, and could be worse if your altimeter is out of calibration.

Here's a simple web calculator which will work on your phone, at the airport. Seems to be pretty accurate.

http://www.csgnetwork.com/stationpressurecalc.html

Input the altimeter setting from your best local source (AWOS, ATIS, etc.) and the altitude where your airplane is parked. Tap calculate, and compare "station pressure" to your MP gauge, engine off. The calibration risk is the accuracy of your local FAA equipment.

 

[preid]

I tried your steps RV8JD, I dont have any of the adjustments you show. Just the name of the sensor "100434-000"when selected. Maybe a newer firmware change? Im still on 16.1 version with older skyview.

 

[RV8JD]

I tried your steps RV8JD, I dont have any of the adjustments you show. Just the name of the sensor "100434-000"when selected. Maybe a newer firmware change? Im still on 16.1 version with older skyview.

It looks like the MAP adjustments came with v15.2.0 on 1/4/2018. So you appear to have a pre-adjustment version of the EMS Sensor Config file.

From: https://dynonavionics.com/whats-new-skyview-sensor.php).

15.2.0

1/4/2018 (version 54802)

Added: MAP adjustment. To use, adjust the BARO setting until the altimeter reads zero. The baro window is the current MAP pressure. Then, choose the appropriate MAP sensor in EMS configuration to make MAP as good as possible.

 

[preid]

interesting i don’t get that option.. wonder what else I am missing.

 

[RV8JD]

One suggestion: As long as you do not have a custom engine sensor definitions file, download to a USB flash drive the latest engine sensor definition file from Dynon (file: "sensor_68996.sfg"). It's available from the link below, under the "System Software (Classic/Touch/SE)" tab, at the bottom, right of the page ("Engine Sensor Definitions for SkyView"). Note the caveats listed. Then load the file into the SkyView.

Dynon Avionics | Software Updates and Downloads

Download and get updates to the latest SkyView Software for either HDX, Classic, Touch or SE.

dynonavionics.com

BTW, the code for the +/- 0.5" HG sensors (id=100434-000) looks like this, copied from my engine sensor definitions file ("... Sensor_Config.sfg"). It is near the top of the file.

sensor={ id=100434-000 ;VERIFIED POLY, FILTER? function=PRESSURE pins=C37_P26 ; THIS NAME IS FOR A SPECIAL CASE FUNCTION WHICH WILL NOT APPEND "PRESSURE" TO THE END OF THE SENSOR NAME name=MAP ;The below are in PSI, not inHG, like all pressure senders min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.7993 c_x0=1.1599 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (-0.1) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.7800 c_x0=1.1560 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (-0.2) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.7608 c_x0=1.1522 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (-0.3) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.7415 c_x0=1.1483 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (-0.4) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.7223 c_x0=1.1445 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (-0.5) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.7030 c_x0=1.1406 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (+0.1) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.8186 c_x0=1.1637 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (+0.2) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.8378 c_x0=1.1676 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (+0.3) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.8571 c_x0=1.1714 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (+0.4) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.8763 c_x0=1.1753 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 } sensor={ id=100434-000 (+0.5) function=PRESSURE pins=C37_P26 name=MAP min_val=2 max_val=29.5 resolution=1 round=.1 is_piecewise=0 low_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=5.8956 c_x0=1.1791 } low_resistance=NONE low2high_cross=0 high_coeff={ c_x4=0 c_x3=0 c_x2=0 c_x1=0 c_x0=0 } high_resistance=NONE high2low_cross=0 window=.2 shift=3 age=16 }

 

[preid]

Thank you! I seem to definitely have an older version of .sfg. Appreciate you bringing that to my attention and the detailed reply with steps!

 

[swatson999]

It looks like the MAP adjustments came with v15.2.0 on 1/4/2018. So you appear to have a pre-adjustment version of the EMS Sensor Config file.

From: https://dynonavionics.com/whats-new-skyview-sensor.php).

15.2.0

1/4/2018 (version 54802)

Added: MAP adjustment. To use, adjust the BARO setting until the altimeter reads zero. The baro window is the current MAP pressure. Then, choose the appropriate MAP sensor in EMS configuration to make MAP as good as possible.

You'd think that would be in either installation manual or the user's guide, wouldn't you? If it is, I couldn't find it. Thanks for the link!