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Operation Theorem
4
Operation Theorem
The operation theorem of the functions on PCI-9112 card is described in
this chapter. The functions include the A/D conversion, D/A conversion,
Digital I/O and counter / timer. The operation theorem can help you to
understand how to manipulate or to program the PCI-9112.
4.1 A/D Conversion
Before programming the PCI-9112 to perform the A/D conversion, you
should understand the following issues:
Ø A/D front-end signal input connection
Ø A/D conversion procedure
Ø A/D trigger mode
Ø A/D data transfer mode
Ø Signal Connection
4.2 Analog Input Signal Connection
The PCI-9112 provides 16 single-ended or 8 differential analog input
channels. The analog signal can be converted to digital value by the A/D
converter. To avoid ground loops and get more accuracy measurement
of A/D conversion, it is quite important to understand the signal source
type and how to choose the analog input modes : signal-ended and
differential. The PCI-9112 offers jumpers to select 16 single-ended or 8
different analog inputs.