Borgelt B700 Variometer
Borgelt B700 Variometer/Averager/Integrator/Audio Logarithmic scale with backup power. 57mm or 80mm, Metric or Knots.
Wings & Wheels is proud to be a Borgelt Instruments Dealer.
• Unique lift trend displays and warnings, both audio and visual.
• Expanded scale in low range (± 2 knots or ± 1 M/s).
• Compressed in high range (+14 knots or +7M/s maximum indication), catering for all lift strengths without switching.
• Better sensitivity (pointer movement per lift unit) in mid range than typical mechanical vario or LCD vario.
• Expanded audio sensitivity in low climb range.
• Digital display never obscured by pointer while climbing.
• High contrast, high resolution stepper motor driven white pointer against black background.
• Bright, clear color LED indicators.
• Running average (AVERAGER) and total climb average (INTEGRATOR).
• Only one instrument of each size (57mm and 80mm), easily field changeable for knots or metric calibration.
• Clear labeling of switch functions.
• Common repeater to both B700 and B800 instruments includes controls.
• Glass front, not plastic.
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″) for the bushes of the volume and mode switches. The top left and lower right holes should be drilled to 4.5mm (11/64″) 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.
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 “ull 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 interthermal 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.
User Options As supplied the B700 variometer response is set to “fast”(around 2 seconds time constant). It may be slowed by gently turning the control marked “response” clockwise using a small flat blade screwdriver. Maximum is a little greater than 180 degrees of movement. This should not normally be necessary and we recommend you do not adjust this until you have flown with the instrument for some time.
Also, as supplied the B700 is set to Knots calibration and “competition” mode Metric calibration requires setting the “mode” control to either end of the range (Maximum is a little greater than 180 degrees of movement). Fully anticlockwise is Metric with audio set to “B40 Classic” mode where the beeps are always 50% on, 50% off (the green light still works normally). Fully clockwise is Metric “competition” mode. Moving about 60 degrees from each stop sets Knots calibration with the audio mode selection the same as on the stop on that side. Caution – GENTLY does it. DO NOT FORCE the control against the stop