B700
vario/averager/integrator/audio
Web: www.borgeltinstruments.com
57mm or 80mm
Email: [email protected]
Metric or Knots
Installation
General installation guidelines are available from our website or request a copy -
please read prior to installation.
Remove batteries from glider until installation is complete.
The B700 fits a standard 57mm or 80mm instrument panel hole. The top right and
lower left mounting screw holes should be drilled to 6.35mm(0.25 inches) for the
bushes of the volume and mode switches. The top left and lower right holes
should be drilled to 4.5mm (11/64inches) to take the two M4 machine screws
provided to mount the instrument.
Put the instrument in place behind the panel, place the bezel on the front of the
panel (the bezel is reversible - place the side for the calibration you desire facing
you - 0 to 7 is meters/second, 0 to 14 is Knots) and screw the two M4 machine
screws in place gently. Adjust the bezel position for symmetry before tightening
screws.
Remove XCB (eXternal Connection Board) from rear of instrument by removing
2 x M3 screws from top corners. Tilt back to disengage DB15 connector then lift
to remove from fixed screw at bottom (bottom fixture has a slot to allow this)
Connect Total Energy line to pressure barb marked TE (see label on top of
instrument). Use green rubber doughnut over TE line to provide a seal. Slide this
close to instrument.
If you do not have a two hole TE probe of the modified Irving type on the
sailplane, Borgelt Instruments can supply one. These probes provide the best TE
compensation in our experience.
Connect sailplane 12 volt power and GROUND to XCB, place 4 x AA size
ALKALINE batteries in battery box if standby power is to be used. These will be
good for at least 8 hours of standby power at reasonable volume levels. We do not
recommend use of standby power supply instead of 12 volt sailplane power. It is
intended as emergency power only.
Replace XCB. Plug in Repeater cable, if used, to socket on XCB. See label on top
of instrument.
Plug in speaker supplied. Any 8 ohm, 0.25 watt or higher speaker may be used.
Mount power select switch on panel.
Main 12 volt power supply needs to be switched separately.
Ensure installation is secure and does not interfere with aircraft controls.
Operation
Startup: On power up pointer goes full down for a few seconds, then back to zero,
the lights flash on momentarily then variometer is ready to use a few seconds later.
Audio volume is set to a default level and is adjusted by the toggle switch in the
top right mounting hole position. Moving the toggle left and up increases volume,
right and down decreases volume.
The toggle switch in the lower left position has three positions. Up and to the left
is a momentary position and momentarily selecting this position changes the audio
mode. The standard setup is that the audio is in "full range" (up and down audio on
power up). First momentary selection, all the blue and amber lights flash for a
short time and the audio is confirmed in full range mode. Second momentary
selection the blue lights flash for a short time and the audio is in "up only" mode
and the sink audio is muted. Next selection causes both blue and the lower amber
light to flash and the audio is "full range"(climb and sink) but with a silent zone
between 1 and 4 knots sink (0.5 to 2 M/s). This corresponds to normal inter-
thermal sink rates. Sound then signifies some significant change in the airmass is
occurring. Next selection flashes all blue and amber lights and the audio is in "full
range" mode. This pattern repeats with successive selections.
In the middle position this switch selects the digital display to show the running
(last circle) average. It is a slow variometer with a time constant of around 18
seconds. This is the AVERAGER.
In the lower right switch position the average for the whole climb (total height
gain/time taken from start of climb to present time) is shown on the digital display.
This is the INTEGRATOR.
Indications
The white pointer indicates total energy rate of climb at all times. The basic
variometer time constant is around 2 seconds. The scale is expanded in the 0 to +/-
2 Knots (1 M/s) range, the same as the B400/B500 variometers in the 2 to 8 knot
(1 to 4 M/s) range and compressed in the 8 to 14 Knot (4 to 7 M/s) range. Pointer
movement is hence amplified in the low range (useful in weak lift or on best L/D
final glides) and the pointer still moves in the strongest lift.
At 10 knots (5 M/s) the audio produces 1 Hz (one per second clicks) rising to 5 per
second at 5 knots (2.5 M/s)sink and rising from there to 1200Hz and greater at 10
knots (5 M/s) and higher climb rate. At positive rates of climb the sound is
interrupted and becomes "beeps". The beep rate increases with increasing rate of
climb.
Note
that the audio ALWAYS has twice the change in pitch and beep rate from 0
to 1.5M/s (0 to +3 knots) as it does for the rest of the "up" range".
As supplied the B700 audio is in "competition" mode. This means that when the
vario reading is below the AVERAGER running average value the beeps above
zero are 70% on and 30% off. Above the AVERAGER the beeps are 50% on and
50% off. This is a subtle yet distinctive change which lets you know things are
getting better or worse and which side of the thermal is best.
The green light also lights when the vario is above the AVERAGER When it goes
out the running average climb rate is decreasing.
Designed & manufactured by:
Borgelt Instruments
Tel: 07 4635 5784
P O Box 4607 Toowoomba East QLD 4350 Australia
or Tel: + 61-7 4635 5784 outside Australia
