MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 64
Generally it is not required to fit any form of power supply filters or surge suppressors as the
Stratomaster Ultra includes the required protection devices. External power line filters or surge
protectors should only be considered in very unusual conditions.
Important note: Please provide the Stratomaster with its own ground (earth) return wire to
the battery. Do not share this wire with any other equipment like lamps, radios or any
other items. Spurious currents caused by other equipment can cause the Stratomaster to
receive an invalid ground reference. This reference (minus pole of the battery) must be of
best possible quality as it is a reference for many senders like EGT, CHT water
temperature and oil pressure
.
Please note: If you set the display backlight mode to “auto”, the display backlight will be switched
off automatically after four minutes of no activity to conserve power. The display backlight will
remain switched on if engine revs are detected.
You can select backlight modes in the Device Setup Menu under Device Basic Setup.
Ambient temperature sender
The Stratomaster Flight includes a precision semiconductor temperature probe. It is
recommended that you install it as shown above. The
RED
wire connects to the “Temperature
” terminal. The remaining wire may be
GREEN
,
BLUE
or
BLACK
. This wire connects to
the “Temperature sensor –“ terminal.
The probe head itself should be mounted using suitable means outside of the instrument pod or
aircraft if a closed cockpit aircraft is used. The probe should be placed in the shadow of the pod
or aircraft or in a place were sunlight cannot heat the probe. Also ensure that engine heat or
exhaust gases cannot heat the probe at any time. Remember – the probe is intended to show the
temperature
outside
of your aircraft – not inside.
The twisted cable can be extended should this be required. In this case please use a similar
cable type and continue the twist for the length of the cable.
The probe is required for the display of ambient temperature and density altitude. Should you
choose not to use the probe, please disable the “External temp sens” in the mode menu. In this
case the unit will use the internal temperature probe. Due to self-heating of the unit this may lead
to incorrect, exaggerated density altitude readings.
We recommend that you install the external temperature probe.
