SI-H Muscle Testers
28
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
Signal Conditioning Amplifi er System
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 Programmable Filter
1. Press
the
Filter Select
button to choose the type of fi lter you would like to apply. The
appropriate
Filter Type Display LED
illuminates (Bessel or Butterworth).
2. Use the Up or Down (
Cutoff Frequency Selection
) buttons to set the desired cutoff
frequency. The frequency is shown on the
Cutoff Frequency Display
. When using
a Bessel fi lter, do not apply a cutoff frequency greater than 1kHz. Choose the cutoff
