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Borgelt B700
Borgelt B700 Borgelt B700 Borgelt B700 Borgelt B700

B700 Borgelt Variometer

Sale Price: $650.00

SKU: 5316

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Detailed Description

Borgelt B700 Variometer

Borgelt B700 Variometer

General Description

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

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

Use above dropdown box for Borgelt B700 Variometer selection.


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.

There is a 2 1/2 digit LCD in the middle of the lower part of the variometer scale. This shows either the AVERAGER or INTEGRATOR as selected by the pilot. The range is from at least -10 Knots (-5 M/s) to at least +15 knots (+7.5 M/s).

When climbing, the blue and amber lights are trend comparators between the AVERAGER and INTEGRATOR.

Ten seconds after beginning a climb, the inner amber and blue lights (one of each) turn on, rising tones are heard for a short interval * and the lights remain on for 60 seconds after which meaningful values for both running and whole climb average will have been established.

After that, the light pattern is:

AVERAGER greater than 1.2 x INTEGRATOR, two blue ON
AVERAGER greater than 1.1 x INTEGRATOR, one blue ON
AVERAGER less than 1.1 x INTEGRATOR but greater than 0.9 x
AVERAGER less than 0.9 x INTEGRATOR, one amber ON
AVERAGER less than 0.8 x INTEGRATOR, two amber ON

When the AVERAGER is less than 0.95 x INTEGRATOR, falling tones are heard for a short interval. This audio alert will repeat after 20 seconds while this condition exists and the rate of climb is still positive.

Of course if the current vario reading has decreased markedly and the green light is out the AVERAGER will follow soon.

Combined with the green light and audio ON/OFF ratio and audio alerts these blue and amber lights provide useful cues as to whether to remain in the thermal or to consider leaving.

Whenever the running average (AVERAGER) is greater than the whole climb average (INTEGRATOR) so far, the whole climb average is improving, conversely when the running average is less than the whole climb average so far, the whole climb average must be decreasing. The whole climb average is what determines your average cross country speed and staying in thermals for too long once they begin to weaken will hurt your whole climb average. Equally it is important to center thermals quickly as will be shown by comparing what the AVERAGER indicates for most of the climb against what the INTEGRATOR indicates as you leave.

Of course there may be good reason to remain in a weakening thermal if you suspect it is the last one of the day or there is an extensive dead area to cross. Pilot discretion must be exercised at all times.

It is up to personal preference as to whether the AVERAGE or the INTEGRATOR is selected for display. INTEGRATOR determines cross country speed. AVERAGER is best for setting MacCready for final glide.

The trend system is reset after leaving lift but the INTEGRATOR number is preserved until ten seconds after entering lift the next time.

When running from the standby AA battery pack, the red light flashes briefly every two seconds.
*These tones are disabled in current software release.

Quick Start Guide

Lower Left Switch: 3 Positions
• Up to left – Audio mode select either full range or up only or full range with silent zone 1– 4 knots (0.5 to 2 M/s) sink
• Center – AVERAGER (running 18 second average)
• Down to right – INTEGRATOR (height gain since starting thermal divided by time taken so far – also known as total or whole climb average – you want to try to maximize this).
Pointer – TE vario – note non–linear scale

Digital display – AVERAGE or INTEGRATOR selectable by switch as above

Green light ON = vario greater than AVERAGER, audio beeps 50 -50 (good – AVERAGER getting better)
Green light OFF = vario less than AVERAGER, audio beeps 70 ON, 30 OFF (bad – AVERAGER getting worse)
Blue and amber light ON – thermal integrator auto start.

Upper right switch: 3 position spring loaded either side of center adjusts audio volume
• Up to left volume increases
• Center – no change
• Down to right volume decreases

Two blue lights ON = AVERAGER greater than INTEGRATOR (very good INTEGRATOR getting better)
One blue light ON = AVERAGER greater than INTEGRATOR (good)
No blue or amber lights, climbing, AVERAGER = INTEGRATOR (OK)
Falling audio tones = AVERAGER less than INTEGRATOR (going bad)
One amber light = AVERAGER less than INTEGRATOR (bad)
Two amber lights = AVERAGER less than INTEGRATOR (worse)

Standby power: select using remote toggle switch
Red light flashing – standby power pack in use.
Reduce audio volume to comfortable minimum to extend battery life.


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