SI-MT/SI-MKB/SI-HTB
WORLD PRECISION IN STRU MENTS
7
Front Panel
Zero Button
Gain Switch
Data Acquistion Output
Force Transducer Connection
Offset Adjustment Switch
Offset Adjustment LEDs
Zeroing LED
Gain Indicator LEDs
Gain Calibration Potentiometer
Digital Interface Connection
Fig. 6 SI-BAM21-LCB KG Optical Force Transducer Amplifi er
Zero Button
–When pressed, the
SI-BAM21-LCB
output comes close to zero and the
Zeroing LED
illuminates. Before any measurements are taken, the
SI-BAM21-LCB
should
be zeroed to establish a baseline value for the force transducer.
Offset Adjustment Switch
–This toggle switch permits the position of the baseline to be
adjusted after the baseline is zeroed. Press and hold the toggle switch to the left if you
want to raise the baseline. Or, press and hold the toggle switch to the right to lower the
baseline. If the baseline is more that 0.3V above zero, the
High
LED illuminates, and if it
is less than –0.3V, the
Low
LED illuminates. When the baseline is within 0.3V of zero, the
LEDs are off.
Gain Switch
–Under normal conditions, the
Gain
switch is set to X1. The output of the
force transducer can be amplifi ed by a factor of 2, 5 or 10. Press the
Gain
switch to toggle
between the gain settings. A
Gain Indicator LED
illuminates to show which gain factor is
applied. Larger gains are essential when working with extremely small forces.
Gain Calibration Potentiometer
– This potentiometer can be used to maximize the output
of the amplifi er for the anticipated range of forces to be measured. Use the provided
potentiometer adjustment tool (WPI#
13661
) to calibrate the output of the amplifi er to the
range of forces that will be measured by the transducer. See "Calibrating the SI-BAM21-
LCB" on page 25.
