MGL Avionics Blaze AHRS-2 Manuel utilisateur
Introduction
The AHRS-2 / MAG-2 is a 2 1/4” sunlight readable color display instru ent providing a display for an artificial horizon
reference syste (AHRS), an advanced digital co pass, or both depending on which sensor packages is connected.
The AHRS-2 / MAG-2 can be setup to display the following:
•Co pass with optional slip indicator (requires MGL Avionics SP-6 sensor package)
•Horizon with optional slip, turn indicator & G-Force (requires MGL Avionics SP-7/9 sensor package)
•Turn and bank indicator (requires MGL Avionics SP-7/9 sensor package)
•Co bined co pass and horizon display with bank indicator, optional slip indicator & G-Force (requires MGL
Avionics SP6 & SP-7/9 sensor packages)
1 Features
•Large 2.6” high resolution 320x240, IPS (fully viewa le in all directions), sunlight reada le color LCD
display
• Artificial horizon reference system (AHRS) display unit with slip indication, turn and ank and G-Force
indication
• Advanced magnetic compass with a course steering feature and slip indication
• Can e setup as an individual compass display, artificial horizon or oth
• The AHRS-2 / MAG-2 is connected to the AHRS / Compass sensor packages y a simple CAN us
interface. This allows for the optimum placement of the sensor packages in the aircraft
• More then one AHRS-2 / MAG-2 unit can e connected onto the CAN us. This allows the compass,
artificial horizon and the turn and ank indicator to e displayed on different units
• G-Force indicator (MGL Avionics SP7 required)
• Standard 3 1/8” aircraft enclosure (can e front or rear mounted)
• The LED acklight can automatically adjust to the am ient light, or it can e manually adjusted in the
menu system
• Rotary control plus 2 independent uttons for easy menu navigation and user input
• An external output activates when a high alarm condition has een reached
• Wide input supply voltage range of 8 to 30V DC with uilt in voltage reversal and over voltage protection
for harsh electrical environments
• 1 year limited warranty
Blaze AHRS-2 / MAG-2
AHRS-2: Artificial Horizon and Magnetic
Compass indicator
MAG-2: Magnetic Compass Indicator
Operating Manual – English 1.00
Blaze AHRS-2 / MAG-2 Operating Manual Page 2
2 Layout
2.1 AHRS-2 Layout
2.2 MAG-2 Layout
F2 / Down Button:
Menu Syste : Softkey button
Fast level function
Sunlight reada le color graphic display:
The backlight can auto atically adjust
to the a bient light or it can be anually
adjusted in the enu syste
Rotary Control (Up/Down) & Enter Button:
Press the rotary control during the nor al display screens to access the enu syste .
Rotate anti/clockwise for up/down enu scrolling. During nor al ode turning the rotary control
anti/clockwise will scroll through the ain displays (Artificial horizon, co pass and turn and bank
indicator).
F1 / Up Button:
Menu Syste : Softkey button
Pitch level function
3 1/8” enclosure.
Can be front or rear ounted
Rotary Control (Up/Down) & Enter Button:
Press the rotary control during the nor al display screens to access the enu syste .
Rotate anti/clockwise for up/down enu scrolling.
F1 / Up Button:
Menu Syste : Softkey button
Enable coarse steering display
F2 / Down Button:
Menu Syste : Softkey button
Enable the reverse coarse display
3 1/8” enclosure.
Can be front or rear ounted
Sunlight reada le color graphic display:
The backlight can auto atically adjust
to the a bient light or it can be anually
adjusted in the enu syste
A bient light sensor
A bient light sensor
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3 Main Displays
The AHRS-2 can be set up to show 3 different display screens. Turning the rotary control either clockwise or anti-
clockwise allows you to select the operation of the AHRS-2 as an artificial horizon with ini co pass and a ini turn and
bank indicator, turn and bank indicator, and a digital co pass.
The MAG-2 only displays the co pass display.
Note: If you have purchased the artificial horizon and co pass sensor packages with two or three AHRS-2 / MAG-2
displays, it is possible to setup either of the units to display either the artificial horizon, turn and bank indicator or the
co pass.
3.1 Artificial Horizon with Compass
Pitch level function
Should your aircraft fly “nose up” or “nose down” due to tri , 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 co pass displays. The source of
infor ation for this indicator is derived fro the accelero eter aligned with the pitch axis of the aircraft, i.e. the
acceleration forces acting in the direction of the wings.
G-Force display
10 degree pitchbars
5 degree pitchbars
Slip indicator can be turned on or off in the enu syste
Esti ate Horizon
Magnetic or true heading reading
(co pass can be switched off
in the enu syste )
Mini turn and bank indicator
(can be switched off in the
enu syste )
Slip indicator
Marker description
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Fast level function
Press the F2 key should the horizon display be toppled (i.e. indicating incorrectly by a large a ount) due to excessive
aneuvering or by exceeding the axi u bank, pitch or yaw rates. This will indicate to the instru ent that you are
flying straight and level and that gravity tracking ay be accelerated to ensure rapid realign ent of the horizon.
Extended range of operation
Please see the corresponding MGL sensor docu entation for axi u rate specifications.
Depending on conditions axi u rates ay reach 180 degrees per second. No caging of the electronic gyro syste is
required during excessive aneuvering, unlike syste s based on echanical gyros. Si ply 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 axi u bank, pitch or yaw rates have been exceeded
3.3 Digital Compass
3.3.1 Compass Tape
The digital co pass tape can be displayed in 3 different ways. The way the co pass is displayed can be setup in the
enu syste under “COMPASS SETUP”
Numeric compass display
The heading tape shows headings as nu bers in degrees.
Mixed compass display
The heading tape shows headings as nu ber in degrees except for the four ajor
cardinal points which are shown as N, S, E and W.
Cardinal compass displayThe heading tape shows headings as ajor and
inter ediate cardinal points: N, NE, E, SE, S, SW, W and NW.
Magnetic (M) or true
(T) North indicator
Slip indicator can be turned on or off in the enu syste
Course steering Indicator
Blaze AHRS-2 / MAG-2 Operating Manual Page 5
3.3.2 Using the course steering indicator
To activate the course steering indicator, steer the required heading and then press the F1 key. The co pass will display:
The F1 key pressed at a heading of 176 degrees. Currently the heading equals the
course to steer as 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 right is required to intercept the course.
Each “>” or “<” equals 2 degrees of heading error. To cancel the course steering function, si ply press the F1 key again.
3.3.3 The reverse course (from heading) display
Press the F2 key to activate the reverse course display. This display re ains active for
about 5 seconds before reverting back to the nor al heading display.
3.3.4 Heading sta ility issues
You ay find short ter fluctuations of the heading occurring. These tend to be very s all 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 agnetic field and can also be caused by nearby electrical equip ent such as radios, la ps, electronic
instru entation or co puters, even the ignition syste s of engines. The AHRS-2 / MAG-2 has a co pass filter setting
which can be set to filter out so e of these s all fluctuations.
Blaze AHRS-2 / MAG-2 Operating Manual Page 6
4 Menu System
Press the rotary control button during the nor al display ode to enter the enu syste . Use the rotary control to
navigate through the enu syste .
4.1 Exiting the menu system
Press the F1/Up button to exit the enu syste when the “EXIT” soft key is shown. All changes ade during navigation
of the enu syste will be saved in non-volatile e ory upon exiting. The instru ent will not save any changes if you
re ove power before exiting the enu syste .
4.2 Horizon Setup
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Compass:
Select “ON” if you would like to see the co pass box on the horizon display.
Numeric:
Select “ON” if you would like to see a nu eric display of bank and pitch angles superi posed on the horizon display.
G-Force:
Select “ON” if you would like to see the G-Force displayed on the horizon display.
Ground :
Select the ground color of the horizon. A selection between "BROWN" (default) or "GREEN" can be ade.
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 in/rotation or 2 in/rotation turn.
Slip:
Select if you would like to enable the slip indicator to be shown underneath the horizon display. The slip indicator
operates in the sa e fashion as the well known “step on the ball” indicator in traditional cockpits.
Note: The slip indicator is always enabled in the turn and bank indicator ode.
Slip Sense:
Select if you want the slip to have a high sensitivity or a low sensitivity setting.
Slip Zero:
This function allows you to set your slip indicator to exactly zero even if your aircraft tends to fly slightly wing down. The
procedure is to place the aircraft in a stable, straight and level attitude during cal flight conditions and then select this
function. To cancel the correction, place your sensor absolutely horizontal (use a spirit level) and select the function
again.
Speed Unit:
Select the speed unit.
Speed:
Enter the cruising speed of your aircraft. This speed is trans itted to the attitude sensor for aiding purposes if the GPS
speed is not available.
NMEA Baud:
Select the Baud rate of your NMEA GPS receiver
NMEA Speed:
The NMEA speed will be displayed if a NMEA co patible GPS receiver is connected to the AHRS-2.
Pitc Marker:
This enables or disables the pitch arkers on the horizon display.
CAN Address:
Select the CAN address of the SP-X attitude sensor.
Blaze AHRS-2 / MAG-2 Operating Manual Page 8
4.3 Compass Setup
Display:
Select the style of the co pass tape as in section display ode as described in section 3.3 above
Heading:
Select whether you would like the instru ent to display agnetic or true heading. If you select true heading, you need to
enter the correct agnetic variation for your location. You can find your local variation on aeronautical or ariti e
charts. The heading displays will be aug ented with °M or °T depending on the ode you have selected.
Variation:
Enter the agnetic variation of your location. This is only used if you would like the instru ent to display true heading.
True heading is the heading relative to the geographic North Pole. Magnetic heading is the heading relative to the
agnetic North Pole. Variation is expressed in degrees east or west. Please note that should you ove a long distance,
you ay have to update the variation setting. This setting ay be ignored if you only use the agnetic heading display
option.
Filter:
Select the filter factor for the co pass heading. A selection of "NONE", "LOW", "MED" or "HIGH" can be ade. This can
i prove the stability of the co pass.
Slip:
Select if you would like to enable the slip indicator to be shown underneath the horizon display. The slip indicator
operates in the sa e fashion as the well known “step on the ball” indicator in traditional cockpits.
Slip Sense:
Select if you want the slip to have a high sensitivity or a low sensitivity setting.
Slip Zero:
This function allows you to set your slip indicator to exactly zero even if your aircraft tends to fly slightly wing down. The
procedure is to place the aircraft in a stable, straight and level attitude during cal flight conditions and then select this
function. To cancel the correction, place your sensor absolutely horizontal (use a spirit level) and select the function
again.
Can Address:
Select the CAN address of the SP-X co pass sensor.
Blaze AHRS-2 / MAG-2 Operating Manual Page 9
Calibrate
This allows calibration of the agnetic sensor.
In-Flight cali ration Procedure
Please see docu entation supplied with the SP-6 for ore infor ation.
Fly the aircraft in safe area where you can perfor rando banked turns. Do not exceed the safety li its of the aircraft
during the calibration flight.
Start the calibration in the Co pass setup enu by selecting “Calibrate”. The AHRS-2 /
MAG-2 will display the co pass calibration screen. You should see the co pass heading
change to “111” to confir that calibration has started.
Fly a nu ber of banked 180 or 360 degree turns at different bank angles - i.e. shallow, ediu and steep turns. Try to
add any different pitch attitudes in various orientations relative to the field direction. It does not atter in what order you
fly the aneuvers. A typical, good calibration tends to take 5-10 inutes of flight.
Do not activate any electrical equip ent that creates large agnetic fields during the calibration process (for exa ple
starter otors, autopilot servos, landing lights etc). The heading starts reading 111 after you start calibration. After 36
initial sa ples have been collected this changes to 222. This should take approxi ately one turn. Continue the flight
while aneuvering until the heading starts reading nor ally. This happens once the SP-6 has collected 100 distinctly
different agnetic sa ples. At this point the heading should start showing reasonable nu bers. Continue the calibration
flight, settling into straight and level at intervals on different headings and verify the heading readout against an
ACCURATE reference. Continue the flight until you find heading errors that are within 1 to 2 degrees, about the li it one
can reasonably expect.
When satisfied, end the calibration by selecting “DONE” in the co pass calibration enu. This will save the calibration to
per anent e ory in the SP-6. Should you not be able to achieve a good heading readout, please locate the co pass to
a better location in the aircraft.
The AHRS-2 / MAG-2 displays the calibration sa ple count and fit percentage during calibration. The sa ple count will
count up to 150 after which new sa ples replace the oldest sa ples stored. The fit percentage is a value fro 0% to
100%. The ai is to get to a value as close as possible to 100%. The fit starts displaying other than 0% after the first 36
sa ples. Fit values of 98% and higher are considered good. If you cannot achieve this you do not have a good
installation location for your co pass. You ay still get reasonably good heading accuracy despite a lower fit. However,
to ensure long ter accuracy please consider locating the SP-6 in a better area in your aircraft.
If the readout decreases suddenly by a large a ount (for exa ple fro 85% to 42%), this is typically caused by a
strong ti e-variant agnetic field such as can be created by electrical equip ent ( otors, relays, current flow in cables).
In such a case please either end and restart the calibration or continue the calibration flight until the fit error is acceptable
again (the incorrect agnetic sa ple(s) will eventually be re oved). It is advised to locate the interference source and
either ove this or the SP-6 to a better location in the aircraft.
Note: should you ove the SP-6 to a new location or fit new equip ent close to the SP-6 you will have to perfor the
calibration again. There is no practical li it as to how any ti es you can perfor and save a new calibration.
Blaze AHRS-2 / MAG-2 Operating Manual Page 10
4.4 MISC Setup (Miscellaneous Setup)
Backlig t:
Select anual or auto atic backlight control.
Use the rotary control in anual ode to adjust the backlight brightness.
Allow 3 seconds for the display to adjust to the a bient lighting conditions when using
the auto atic backlight ode. The display will set the backlight to the di setting if the
a bient light is less then the threshold setting, alternatively the display will set the
backlight to the bright setting if the a bient light is greater then the threshold setting. The
a bient light received is shown as the ADC value in the top header. Use this value to set
the threshold value.
Security Setup:
Select this enu option if you want to password protect the enu syste .
Information:
This enu option displays infor ation about the unit.
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