Physitemp Instruments VIBRATRON II - Manual (Page 4)

Testing is completed when the subject has made a total of five errors. A single error often appears early
in the testing sequence. This anomalous data point is compensated for in the data analysis procedure (see
below.)
It should be noted that accurate measurements below 1 vibration unit (0.5 microns peak to peak ampli-
tude) are not possible with this equipment. Readings obtained below this level should merely be used as
and indication of a tests subjects ability to detect low vibration thresholds and should not be interpreted
quantitatively for purpose of statistical analysis.
DATA ANALYSIS PROCEDURE
Vibration Threshold The first step in caluclating the vibration threshold is to determine the vibration
setting of the five errors and the five lowest correct scores. The highest and lowest values of the ten
scores are eliminated and the mean of the remaining eight scores determine the vibration threshold. The
thresholds, measured in vibration units, can then be converted into microns by using the formula in
Section 3.
NORMAL VALUES
The vibration threshold for the index finger in the normal population between 18 and 65 years of age is
0.7 vibration units with a standard deviation of 0.4 vibration units. The vibration threshold for the great
toe in a similar population is 1.2 vibration units with a standard deviation of 0.5 vibration units. There is
an increase in threshold scores and in variance as a function of age.
5.0 SPECIFICATIONS
5.1 CONTROLLER SPECIFICATIONS
Range - high resolution:
0 - 6.5 vibration units
- low resolution: 6.5 - 19.9 vibration units
Resolution: 0.1 vibration units
Display 3 1/2 digit, 1/2” LED
Power Supply: 110V or 220V AC. See operating instrunctions (Section 2.3) for
explanation
Size 5 3/4” x 3.3/8” x 9 1/4”
14.5 x 8.5 x 23.5 cm
5.2 VIBRATOR MODULE SPECIFICATIONS
Size of Base:
5” x 3” x 4”
12.5 x 7.5 x 10.2 cm
Vibration Frequency: 120Hz with 60Hz AC line frequency
100Hz with 50Hz AC line frequency
Post Height: 3/8”, 95 cm
Accessories Supplied: Carrying case
16” x 11” x 5”
40.5 x 28 x 12.5 cm
Weight, including carrying 14 lbs
case
5