Constant Load The SI-COLUB Constant Load Module for performing constant load experiments, has augmented flexibility. In its primary mode (Constant Load) the unit takes an external trigger command from the force transducer to perform a constant load cycle. In addition, the module allows for a different external trigger or you can completely bypass the module without having to switch cabling. The SI-COLUB Constant Load Module lets you maintain a constant force, muscle length or sarcomere length rather than keep the total length of the preparation constant during an isometric contraction. This is accomplished using a feedback loop. The SI-COLUB monitors a designated parameter to determine how much force is necessary. It also monitors a feedback signal. The motor position command signal driving the motor is constantly adjusted to drive the feedback signal to the commanded setpoint. ●● Offers three modes including Constant Load, Eternal Loop and Bypass ●● Can be configured using MDAC software and Lab-Trax 8/16 data acquisition system Constant Load Mode External Loop Mode Bypass Mode SI-PF100 Programmable Filter Module When you use a motor, an SI-PF100 Programmable Filter is necessary to minimize the natural vibration. It is designed so you can eliminate the resonance frequency without affecting the signal of interest. It is a low pass filter set to pass signals of interest below the specified frequency. It can be calibrated from 5 to 1,000 Hz. You may select either a Bessel or a Butterworth filter. Then, you must carefully select the cutoff frequency based on the typical resonance frequency of your force transducer and your own experimental setup. When the Signal Conditioning Amplifier System electronics are configured at the factory with an SI-PF100 Programmable Filter, the signal is routed internally from the amplifier (SI-BAM21-LCB module) to the SI-PF100. If you prefer, the signal may be routed from the amplifier through the ports on the front panel of the Programmable Filter using a standard BNC cable. ●●Bessel and Butterworth filters ●●Programmable cutoff frequency ●●Signal may be routed through the backplane or through the front panel BNCs MUSCLE PHYSIOLOGY SI-COLUB Force Step ×k Command Linear Motor Measured Force (from SI-AOSUB or SI-BAM21-LCB) Capture Bypass External Trigger (Like SI-SARCAM Camera) Feedback SI-COLUB Constant Load Module SI-PF100 Programmable Filter Module SI-COLUB SPECIFICATIONS COMMAND REQUEST FEEDBACK MOTOR OUTPUT POWER REQUIREMENTS ±10V ±10V ±10V 12V DC provided by the chassis POWER INPUT SI-PF100 SPECIFICATIONS 12 VDC provided by chassis ± 10 VDC 5–1000Hz Bessel, Butterworth CUTOFF FREQUENCY RANGE FILTER TYPES UK: Tel: +44 (0)1462 424700 • wpiuk@wpi-europe.com World Precision Instruments www.wpiinc.com Germany: Tel: +49 (0)30-6188845 • wpide@wpi-europe.com US: Tel: 941-371-1003 • sales@wpiinc.com 11