Physitemp Instruments VIBRATRON II - Manual (Page 6)

22.4 CONNECTION TO AC POWER SUPPLY AND “SWITCH ON”
Connect line cord to socket on the back of the controller and to AC outlet. Use POWER switch on rear
panel to turn ON.
3.0 OPERATION
IMPORTANT NOTE: This instrument is normally calibrated at 60Hz line frequency. If it is to be used at
50Hz line frequency there will be a calibration sticker attesting to this on top of the control unit.
SELECT THE RANGE
There are two operating ranges:
High resolution, 0 - 6.5 vibration units. This range is used when fine control of ampli-
tude is required. It covers the 0 - 20 micron range.
Low resolution, 6.5 - 19.9 vibration units. This range covers the 20 - 200 micron ampli-
tude range.
SELECT THE MODULE
There are two switches on the front panel below the display:
The left switch controls the module selection. When it is in the “up” position, module A
will be vibrating. When in the “down” position, module B will be vibrating.
The right switch is a dummy switch and is used during testing and questioning to con-
ceal which module is being selected.
ADJUST THE VIBRATION AMPLITUDE
The output (signal to the modules from the controller) is indicated on the digital display in
vibration units. Vibration amplitude can be continuously adjusted with the OUTPUT control.
When the OUTPUT control is set to MIN (minimum) and the range switch to 6.5, the
display will read 00.0 ±.1 unit. As the control is turned clockwise, the output will
increase to a maximum of approximately 6.5 units.
When the OUTPUT control is set to MIN and the range is 20.0, the display will read
6.5 ±.1 unit. The maximum output is approximately 19.9 units.
The readings shown on the digital display (X) are related to the true amplitude (in microns) of the vibra-
tion (A) by the following formula:
A = KX 2
where K = 1/2
and A is the peak to peak amplitude in microns
A table for vibration units in whole numbers is provided in Appendix A.
4.0 TESTING PROCEDURES
This procedure and algorithm have been used successfully with the Vibratron II. However, this is not the
only possible approach and Physitemp welcomes input from Vibratron users.
The information in this section has been supplied by Dr. Joseph Arezzo, Albert Einstein College of
Medicine, Bronx, NY.
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