Instruction manual

SI-MT/SI-MKB/SI-HTB

WORLD PRECISION IN STRU MENTS

8. If you intend to use multiple ampliﬁ cation factors, cross-check your calibration. For

example, if a 0.5g mass was used to calibrate the SI-BAM21-LCB as close as possible

to 10.0V at a gain of X10, then at a gain of X1, the monitor should display an output

very close to 1.0V for the same 0.5g calibration mass.

Making Measurements

After the SI-BAM21-LCB has been calibrated, measurements may be taken.

1. Turn the SI-BAM21-LCB Power switch on (I).

NOTE: Allow the system to stabilize for about 30 minutes. This allows all the compo-

nents to reach thermal equilibrium, minimizing measurement changes due to thermal

variations.

2. Turn on the data acquisition system.

3. Press the Zero button to set the baseline value for the measurements.

NOTE: When the Zero button is pressed, the zeroing LED illuminates to indicate that

it is functioning properly.

4. Measurements may be taken.

Setting System Gain Factor

The SI-BAM21-LCB gain multiplier setting is selected with an internal jumper that is

conﬁ gured at the factory for use with the muscle tester system of your choice (SI-MT,

SI-MKB, SI-HTB). The X1 setting (SI-MT/SI-HTB) allows for 1X, 2X, 5X and 10X gains.

The X10 setting (SI-MKB) allows for 10X, 20X, 50X and 100X gains that may be needed

when recording passive tension or small muscle contractions.

1. Turn off the Signal Conditioning Ampliﬁ er System and unplug it from the power out-

let.

2. Remove the two screws on the face of the SI-BAM21-LCB module.

3. Gently slide the module out of the Signal Conditioning Ampliﬁ er System frame.

4. Locate the 3-pin jumper J16. Jumper pins 1 and 2 to use the SI-BAM21-LCB with X1

gain multiplier, or jumper pins 2 and 3 for use with X10 gain multiplier.

5. Reinstall the module into the frame and secure it with the screws.

Using the Anti-Oscillation Unit

Adjusting the Anti-Oscillation Filter

The anti-oscillation ﬁ lter is adjusted at the factory using the transducer that is supplied

with the SI-MT, SI-MKB, SI-HTB, or SI-CTS system. Normally, the ﬁ lter does not need to

be reset, unless a different force transducer is connected to the unit. To adjust the anti-

oscillation ﬁ lter properly, the transducer is excited at its resonance frequency using a

magnetic driver or pulser (WPI #97204).