MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 9
Fuel level sender input
Measurement accuracy of input: +/-2%. Overall measurement accuracy of fuel level is subject
to quality and installation of chosen fuel level sender as well as complexity and form of tank
shape.
Using the prescribed calibration procedure we find we can calibrate within 5% of actual level
for most tank shapes.
Power supply
The Stratomaster Ultra unit is optimized and intended for operation on a 12V DC supply such
as a motorcycle battery. However, it can be operated on any power supply down to about 7
volts as well as aircraft power supplies of 24 or 28V DC.
For high voltage power supplies (above 18V) MGL Avionics recommends the installation of a
pre-regulator to reduce heat build up in the instrument. Such a pre-regulator is inexpensive
and only needs to provide a maximum current of ½ ampere. Please contact your supplier or
MGL Avionics on further details is required.
Current consumption may vary slightly between units but is typically in the region of 80 mA
without display back light and 280 mA with display back light. Please note that when
connecting external sensors such as the fuel level sender, this is supplied from the unit and
the current consumption of the sender has to be added to the consumption of the basic unit.
The above figures include the current needs of the RDAC EIS unit.
The unit is internally protected against temporary over voltage loads such as those that can
be produced by a cranking starter motor.
It is advisable to power the unit via a fuse or circuit breaker. A fuse rating of 1A (slow blow) is
recommended. Generally it is accepted to use circuit breakers that can be reset during flight
should the need arise. Ordinary fuses are not recommended for aircraft use.
The Stratomaster Ultra “L” features and functions
Basic system functions
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Altitude to 40 000 ft (12 195 m) calibrated, 1ft dynamic resolution
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Airspeed ASI analog and digital, TAS digital
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Stopwatch
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Glide and climb ratio to 1/99
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QNH 960 to 1 060 mb (28.3 - 31.3 Inch of Hg)
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QNE 1013 mb quick select (29.9 Inches of Hg)
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Time of day, Date for flight log entries
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Air time since take-off (or lesson time)
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Ambient temperature using external sensor
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Fuel level using flow sender or optional level sender
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Fuel flow using optional flow sender
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Current range estimate (range at current speed and fuel burn)
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Fuel bingo estimate (time until tank empty)
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Air distance made good
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Voltage. Supply to unit. Usually 12V battery.
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VSI +/- 9 990 ft/minute (50.7 meters per second) range with logarithmic analogue
display
