SI-MT/SI-MKB/SI-HTB
WORLD PRECISION IN STRU MENTS
9
Cutoff Frequency Selection Buttons
–Use the Up and Down buttons to change the
frequency of the fi lter applied to the input signal.
Signal In BNC
– The output signal from the transducer amplifi er comes into the
SI-PF100
through this port (LPF IN). If the signal is not routed along the backplane, connect the
SI-
BAM21-LCB
Force Output
to this port.
Signal Out BNC
– The Programmable Filter applies the selected cutoff frequency to the
input signal (LPF IN) and makes the fi ltered signal available through this BNC port (LPF
OUT).
SI-AOSUB
Every force transducer has a resonance frequency at which it vibrates. The
SI-AOSUB
allows you to locate that frequency and fi lter the signal to mitigate the noise of the
resonance frequency. Since each force transducer is unique, the anti-oscillation unit must
be calibrated for each force transducer. Likewise, the tissue mounting hardware affects
the resonance frequency. Therefore, the system must be calibrated with the mounting
hardware attached to the force transducer.
Front Panel
Pulser Amplitude Adjustment Knob
Pulser Port
External Input Port
Anti-Oscillation Frequency
Adjustment Potentiometer
Signal Amplitude
LED Array
Filtered Signal Output Port
Fig. 8 SI-AOSUB Anti-Oscillation Module
Pulser Port
–Connect the Pulser cable to this port when you need to calibrate the system
for a force transducer. The force transducer fi ts inside the Pulser, and the Pulser uses a
strong electro-magnet to exert small square-wave forces on the force transducer.