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BIOPAC Hardware | SS12LA | Page 3 - 3 Updated: 3.21.2013
Gain set too high — Clipped Force data
e) If the signal is clipped, decrease the Gain setting by one step (e.g., from x5000 to x2500) and collect new
data at the lower gain setting.
To access the Gain setting: MP3X menu > Setup Channels > Force preset channel > View/Change
Parameters icon > Gain pull-down menu
f) Repeat this procedure until the signal no longer appears “clipped.”
Once an optimal gain setting for the transducer has been established, this same gain setting can be used for
other similar transducers and similar measurements.
2) The next step is to actually calibrate the transducer, which means mapping the input signal to more
meaningful units (such as grams). To do this:
a) Access the Channel scaling dialog box (MP3X menu > Setup Channels > Force preset channel >
View/Change Parameters icon > Scaling button).
Note:
In this sample dialog, a weight of 5 grams
was placed on the transducer and the Cal
1 button was pressed.
The transducer weight was then removed
and Cal 2 was pressed.
b) Place the maximum expected weight or force on the transducer.
c) Click on the Cal 1 button in the Channel scaling window.
A voltage value will be automatically entered in the corresponding Input value box.
d) Remove all weight or force from the transducer.
e) Click on the Cal 2 button in the same scaling window.
A voltage value will be automatically entered in the corresponding Input value box.
The transducer will be calibrated to the set values the next time an acquisition is started.
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