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Trouble-shooting
When the VISO II detects a fault, an error ("ERR") symbol and trouble shooting
numbers 2 to 5 and 100 are displayed in the upper part of the screen. At the same
time the unit beeps every minute.
The "ERR" trouble shooting codes are as follows: ERR 2 (transducer defective), ERR
3 (transducer out of range), ERR 4 (crystal defective), ERR 5 (comm. error to flash),
ERR 100 (flash defective). Remedy: Perform reset.
(Performing reset, see page 56)
If the unit still does not function correctly even after replacing the batteries and
performing reset, perform following: Press and hold
resets to factory settings and sounds three beeps. Note: All logbook data are lost
If the unit is still faulty, please contact your local dealer or
LARSEN & BRUSGAARD.
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APPENDIX
Example: A skydiver (in a fixed freefall position) who has a terminal fall rate of
62 meters/sec at 10,000 feet will have a terminal fall rate of 50 meters/sec at
3,000 feet.
It will be seen that the difference in altitude (air pressure) makes it difficult to
compare the fall-rates when measured using TAS.
SAS. The SAS formula calculates airspeed (using the same metrics used with TAS) as
though the complete skydive had been performed at a fixed air pressure and a fixed
temperature which corresponds to 4,000 feet ASL. 4,000 feet is chosen as the refer-
ence altitude by LARSEN & BRUSGAARD since this is the average altitude at which
the working time of a skydive is normally ended.
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SPECIFICATIONS
Mechanical
Dimensions:
81 x 69 x 23 mm (3 1/8" x 2 ¾" x 3/4")
Weight:
90 g (3.9 oz)
LCD area:
5.5 cm
Logbook
Maximum jumps:
200
Logbook information:
Exit altitude
Deployment altitude
Freefall time
Max. speed in freefall
Max. speed under canopy
Tolerances:
Exit altitude: +/- 1.2%
Deployment altitude: +/- 1.2%
Freefall time: +/- 1 sec
Speed (TAS/SAS): +/- 3 mph (+/- 5 kmh)
64
while resetting. The VISO II
(0.9 inch
2
)
2
APPENDIX
TAS and SAS
Definitions
True Airspeed (TAS) and Skydiver's Airspeed (SAS) are two methods of calculating
the airspeed of a moving/flying/falling object.
TAS is a term used in aviation: It is the speed of an object relative to the
surrounding air, regardless of the altitude.
SAS is a new concept developed by LARSEN & BRUSGAARD: SAS is the speed of a
skydiver calculated from measurements of air pressure and
temperature and converted to a fixed air pressure (875.3 mb) and a fixed tempera-
ture (+7.080C) which corresponds to 4,000 feet ASL.
TAS. A skydiver's True Airspeed (TAS) relative to the ground changes as a function
of the altitude (air pressure) and temperature which makes it difficult to compare
fall-rates.
APPENDIX
Conclusion
Using SAS, skydivers in any body position can express their vertical speed by a
number (SAS). This number remains virtually constant regardless of altitude with
little or no variance due to temperature differences and can be compared with the
airspeeds of other skydivers.
This means that regardless of the elevation of the DZ you are jumping at,
SKYDIVER'S AIRSPEED (SAS) will be the same for the same body position.
SAS is very useful when doing big formation skydiving. If using TAS, it will seem like
the base is slowing down the fall rate during the entire skydive.
For information about using the VISO II as a Speed-Meter, see page 16.
SPECIFICATIONS
Profile Storage
Continued storage of last jump
Maximum logging time:
10 minutes
Sampling rate:
4/sec.
Maximum logging altitude:
39,999 feet (12,191 m)
Factory default settings
Mode
Alti-Meter
Feet / Meter:
Feet
Mph / Kmh:
Mph
TAS / SAS:
TAS
Type of Dive:
0
Date:
2009:01:01 (year, month, date)
Time:
12:00:00 (hours, minutes, seconds)
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