info@biopac.com
support@biopac.com
www.biopac.com
BIOPAC Hardware | SS12LA | Page 2 - 3 Updated: 3.21.2013
SS12LA SPECIFICATIONS*
Lever Arm Position
(hook ring)
Full Scale Range
(FSR)
10Hz Noise 1Hz Noise
50 grams 50 grams 2.5 mg 1 mg
100 grams 100 grams 5 mg 2 mg
200 grams 200 grams 10 mg 4 mg
500 grams 500 grams 25 mg 10 mg
1000 grams 1000 grams 50 mg 20 mg
Sensitivity
1mV/V (for 5V excitation, output is 5mV at full scale)
Temperature Range
-10°C to 70°C
Thermal Zero Shift*
<±0.03% FSR/°C
Thermal Range Shift*
<0.03% Reading/°C
Excitation Voltage
5 VDC
Nonlinearity*
<±0.025% FSR*
Hysteresis*
<±0.05% FSR*
Non-repeatability*
<±0.05% FSR*
30-Minute Creep*
<±0.05% FSR*
Dimensions
19mm (wide) 25mm (thick) 190mm (long)
Weight (with mounting rod)
300g
Cable length
3 meters
Materials
Aluminum: hook rings
Anodized aluminum: housing
Stainless Steel: attachment arm
* These parameters assume the transducer is set for a 50g range. For all other range
settings, force measurements from 10% to 90% full scale are linear to ±1.0%.
CALIBRATION
The SS12LA is easily calibrated using weights of known mass. Ideally, calibration should be performed with
weights that encompass the range of the forces expected during measurement and should cover at least 20% of the
full scale range of the transducer. When calibrating for maximu
m range on the force transducer, use weights that
correspond to 10% and 90% of the full scale range for best overall performance.
FORCE TRANSDUCER CALIBRATION
Calibrating a force transducer is a two st
ep process. The first step involves finding the optimal Gain setting for the
transducer and the second step is the actual calibration.
1) To find the optimal Gain setting:
a) Start with the software Preset for the force range desired.
To set the Presets: MP3X menu > Setup Channels > Analog Presets > “Force (range)”
b) Load the transducer with the maximum expected weight.
c) Collect data for a few seco
nds at these settings.
d) Inspect the sample data; look for data that is “railed” or “clipped.” This occurs when the input signal
(times the gain setting) is too large relative to the maximum input range. An example of clipped data
follows.
To Next Page
Loading...