iPecs Lab 104441-01, Руководство пользователя, Страница: 41 / 50

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System Calibration
Calibration for External Data Acquisition
The following instructions are used to complete the connection
between the iPecs Lab System and pre-existing customer equip-
ment. This connection is made through the analog signal input port.
This section can be ignored if the data is collected solely by the
iPecs Lab application.
The iPecs Lab System is delivered with a unique calibration data
fi le that is used by the iPecs Lab software to convert strain data
received from the sensor to forces and moments. Because the
system strain data is transmitted digitally to the DCM, the accu-
racy of calculated forces and moments is maintained.
When system strain data is transmitted in analog format to cus-
tomer equipment, there is potential loss of accuracy. However, ad-
vantages to this approach are additional control of sampling rates,
and synchronizing of strain data with data from other sources,
such as force plates. In this case, the customer is responsible for
calculating iPecs Lab System forces and moments from digitized
strains using the calibration data provided with the unit. Calcula-
tion of forces and moments from strains is outside the scope of
this manual.
To allow collection of the iPecs Lab System strain data by a cus-
tomer’s existing data acquisition system, the DCM has an analog
output signal port. With this port, the connection protocol and
cables that are provided with the system may be used to make
connections to customer equipment. To ensure that accuracy is
maintained, the customer should perform a system calibration on
this connection. The system calibration corrects for small errors
DCM Components
A
iPecs Lab DCM (data collection module)
B
USB Connector
C
DB 37 Connector
D
DB 37 Break Out Unit
A
B
C
D