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A standby
power pack of 4 x AA alkaline batteries will
provide at least 7-8 hours of operation in the event of main power systems
failure.
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A remote press
button circuit or button in lower left enables the pilot to select the 20
second running average rate of climb at any time. The audio continues to
function as a variometer during this time.
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Alternatively
one of two small full time digital averager displays may be driven by
the B400 AV. The advantage of the separate
display is that it may be mounted in or very close to the instrument
panel glareshield, close to the pilot's line of sight. One display is 38
x 14mm with 6.3 mm high digits (DAD-S) , the other is 50 x 21 mm with
12.5mm high digits(DAD-L). The displays are supplied with 0.5 m cables
with plugs which plug in to matching sockets on the rear of the B400 AV.
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Audio is full
range or "Up" only and there are two styles - "B40 mode" with solid tone
in sink and 50:50 chopped tone in lift and a "competition mode" as
follows: At -10 knots (-5 m/s) the audio begins with clicks which become
closer together as the sink decreases and then become a rising tone with
the tone being chopped in lift. When the lift is above the running twenty
second average the tone is chopped 50:50, when the lift is below the
running average the tone is 70 on:30 off. Style selection is by a small
switch accessible through a small hole in the rear cover of the
instrument.
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Volume control
is by a centre off toggle switch in the upper right mounting screw
position.(B400).
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The instrument
is supplied with an external speaker with case and mount.
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Total energy
compensation is by TE probe making for easy installation and setup.
