Instruction manual

SI-H Muscle Testers

WORLD PRECISION IN STRU MENTS

Data Acquisition Output–Connect a data acquisition system like WPI’s Lab-Trax-8/16 to

this BNC connector to record the raw SI-BAM21-LCB voltage output. For test purposes, a

multi-meter or oscilloscope may be connected using a standard BNC cable (WPI #2851).

Force Transducer Connection–An SI-KG force transducer is plugged into this DIN

connector. Align the pins, and insert the connector until it is fully seated.

Digital Interface–This connection is a legacy interface for classic SI-H equipment.

NOTE: When the SI-MT or SI-MKB electronics are conﬁ gured at the factory for the

muscle Tester systems, the signal is routed internally from the SI-BAM21-LCB module to

the SI-AOSUB module. The Force Output connection on the front of the SI-BAM21-LCB

module also shows the raw unﬁ ltered signal from the transducer, but it does NOT need to

be connected externally.

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. 7 SI-AOSUB Anti-Oscillation Module