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Vega AHRS-1 / AHRS-3 / MAG-1 Operating Manual

Page 7

3.3.4 Heading stability issues

You may find short term fluctuations of the heading occurring. These tend to be very small and are typically less than one
degree. This could still cause the heading to fluctuate occasionally by a single degree. These fluctuations occur naturally
in the earth’s magnetic field and can also be caused by nearby electrical equipment such as radios, lamps, electronic in -
strumentation or computers, even the ignition systems of engines. The AHRS-1/3 / MAG-1 has a compass filter setting
which can be set to filter out some of these small fluctuations.

3.4 GPS Viewer

These display are active when a NMEA compatible GPS receiver is connected to the serial port.

The following GPS information is displayed:

•

Time and date

•

Latitude and Longitude

•

Magnetic variation

•

Sunrise and Sunset times

•

GPS altitude

•

SOG (Speed over ground)

•

COG (coarse over ground)

•

GPS fix

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Содержание Vega AHRS-1

Страница 1: ...1 Vega AHRS 3 Vega MAG 1 AHRS 1 Artificial Horizon and Magnetic Compass indicator AHRS 3 Self Contained Artificial Horizon Magnetic Compass indicator MAG 1 Magnetic Compass Indicator Operating Manual English 1 08 ...

Страница 2: ... display unit with slip indication turn and bank and G Force indication requires the MGL Avionics SP 7 sensor packages AHRS 3 Artificial horizon reference system AHRS display unit with slip indication turn and bank and G Force indication complete with built in attitude sensors The AHRS 3 does not require the MGL Avionics SP 7 sensor package to display attitude Advanced magnetic compass with headin...

Страница 3: ...i clockwise will scroll through the main displays Artificial horizon compass and turn and bank indicator F1 Up Button Menu System Softkey button Pitch level function 2 1 4 57mm enclosure Can be front or rear mounted Rotary Control Up Down Enter Button Press the rotary control during the normal display screens to access the menu system Rotate anti clockwise for up down menu scrolling F1 Up Button M...

Страница 4: ...nk indicator or the compass 3 1 Artificial Horizon with Compass Pitch level function Should your aircraft fly nose up or nose down due to trim then you can press the F1 key to level the pitch as displayed on the horizon 3 2 Turn and Bank Indicator Slip indicator A step on the ball slip indicator can be enabled to appear below the horizon and compass displays The source of infor mation for this ind...

Страница 5: ...ems based on mechanical gyros Simply correct the horizon when you are finished or let the horizon right itself which will happen during straight and level flight Message displayed when the maximum bank pitch or yaw rates have been exceeded 3 3 Digital Compass 3 3 1 Compass Tape The digital compass tape can be displayed in 3 different ways The way the compass is displayed can be setup in the menu s...

Страница 6: ... shown below the heading tape No course steering indicators are shown The current heading is 169 degrees course steering indicators show the need to steer slightly to the right to intercept the course The current heading is 218 degrees course steering indicators show that a large correction to the left is required to intercept the course Each or equals 2 degrees of heading error To cancel the cour...

Страница 7: ... can also be caused by nearby electrical equipment such as radios lamps electronic in strumentation or computers even the ignition systems of engines The AHRS 1 3 MAG 1 has a compass filter setting which can be set to filter out some of these small fluctuations 3 4 GPS Viewer These display are active when a NMEA compatible GPS receiver is connected to the serial port The following GPS information ...

Страница 8: ...he rotary control to navi gate through the menu system 4 1 Exiting the menu system Press the F1 Up button to exit the menu system when the EXIT soft key is shown All changes made during navigation of the menu system will be saved in non volatile memory upon exiting The instrument will not save any changes if you re move power before exiting the menu system ...

Страница 9: ...round color of the horizon A selection between BROWN default or GREEN can be made Turn Select whether you want the turn indicator to be shown on the horizon display screen Turn Rate Select whether you want the turn and bank indicators to show a 1 min rotation or 2 min rotation turn Slip Select if you would like to enable the slip indicator to be shown underneath the horizon display The slip indica...

Страница 10: ...m Gyros cannot tell your attitude they can only tell you how your attitude is changing Accelerometers can tell you your attitude but only if you are not accelerating That includes a turn as this involves accel eration constant change of direction In addition accelerometers will react to any movement of your aircraft caused by turbulence etc So basically accelerometers can sometimes tell you your a...

Страница 11: ... Earths gravity as a reference This function takes around 10 seconds to execute Keep the AHRS perfectly still until completed Note The AHRS will refuse to perform this operation if real AHRS bank or pitch angle is greater than 10 degrees Reset Gyro Bias AHRS 3 only Your AHRS gyros bias point is the point where your gyros report that you are not rotating around any axis Gyro bias may drift over tim...

Страница 12: ...iation is expressed in degrees east or west Please note that should you move a long distance you may have to update the variation setting This setting may be ignored if you only use the magnetic heading display option Filter Select the filter factor for the compass heading A selection of NONE LOW MED or HIGH can be made This can improve the stability of the compass Slip Select if you would like to...

Страница 13: ...e Continue the flight until you find heading errors that are within 1 to 2 degrees about the limit one can reasonably expect When satisfied end the calibration by selecting DONE in the compass calibration menu This will save the calibration to permanent memory in the SP 6 Should you not be able to achieve a good heading readout please locate the compass to a better location in the aircraft The AHR...

Страница 14: ...cal miles per hour UTC Offset Enter the UTC offset for your location The UTC offset can be adjusted in half an hour increments Mag Var Select manual or automatic magnetic variation Automatic variation is only possible if using an external NMEA compatible GPS receiver Variation Enter the magnetic variation of your location This is only used if you would like the instrument to display true heading T...

Страница 15: ...th Data payload Checksum ETX STX Start of text 0x02 Address unsigned char 8bit Unit address range 0 255 Message Type unsigned char 8bit Specifies the message type Length unsigned char 8bit Length of the data payload does not include the STX Address message type checksum or ETX Data payload Data Checksum unsigned char 8bit XOR of all bytes starting from the unit address to the end of the data paylo...

Страница 16: ...6 bits Bank Angle in 0 1 degrees Pitch angle Signed Int 16 bits Pitch Angle in 0 1 degrees Yaw Angle Signed Int 16 bits Yaw Angle in 0 1 degrees Slip Signed char 8 bits Slip left right 0 0x80 Attitude Status Unsigned char 8 bits bit 2 set AHRS overrange Heading Unsigned Int 16 bits Heading in 0 1 degrees G Force Signed Int 16 bit G Force in 0 1G ...

Страница 17: ...6 MISC Setup Miscellaneous Setup Backlight Select this menu option to adjust the backlight brightness Security Setup Select this menu option if you want to password protect the menu system Information This menu option displays information about the unit ...

Страница 18: ... for use during IFR in strument flight rules This implies that any such flight that uses the AHRS 3 SP X sensor packages as refer ence for either heading turn and bank or horizon is illegal 6 RS232 NMEA enabled GPS receiver message The AHRS 1 AHRS 3 and MAG 1 have the ability to be connected to a NMEA enabled RS232 GPS receiver to allow the use of actual ground speed in the attitude aiding algorit...

Страница 19: ...nstrument will then have to be returned to the factory Internal flash CRC error The instrument does a firmware check on the program when power is applied to the instrument If the program is corrupt in any way then the internal flash CRC error will be displayed Reload the instruments firmware and load default settings If the error message still persists then it could possibly be an internal flash m...

Страница 20: ... LCD display 1000 cd m2 brightness Sunlight readable with anti glare coating LED Backlight is user configurable Alarm Output Open collector transistor switch to ground Maximum rating 0 25A Dimensions see Vega series dimensional drawing Enclosure 2 1 4 57mm ABS black in color front or rear mounting Flame retardant Weight Approx 120 grams Instrument excluding cables Non volatile memory storage 10000...

Страница 21: ... can be used to upgrade the firmware Please see the Vega firmware upgrading document for more information 12 Installation AHRS 3 The Tilt Compensate function must be done after the installation of the AHRS 3 has been completed This allows installa tion of the AHRS 3 at angles other than vertical face The tilt compensation only needs to be performed once 12 1 Cable connections Main connector D15HD ...

Страница 22: ...e 22 12 2 Connection Diagram The use of an external 1A fuse is recommended Connect the supply terminals to your aircrafts power supply Ensure that the supply voltage will not drop below 8V during operation as this may result in incorrect readings ...

Страница 23: ...Vega AHRS 1 AHRS 3 MAG 1 Operating Manual Page 23 13 Dimensions ...

Страница 24: ...nd relevant pilot s license This person has to make themselves familiar with the operation of this instrument and the effect of any possible failure or malfunction Under no circumstances does the manufacturer condone usage of this instrument for IFR flights IMPORTANT NOTICE You must make your own determination if the products sold by MGL Avionics are safe and effective for your intended ap plicati...

Страница 25: ... and Vertical Speed Indicator VSI EMS 1 Engine Monitoring System FF 4 Fuel Computer INFO 1 Information Display G Force meter UTC and Local Time Slip Indicator Outside Air Temperature OAT Battery Voltage Current and charge display Flight Timer Flight Log Stopwatch Countdown Timer and Alarm MAG 1 Magnetic Compass Indicator MAP 3 Manifold Pressure and RPM Indicator RPM 1 Universal Engine Rotor RPM In...

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