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The 16 analog input channels are terminated on sixteen pins of the user I/O connector.
Data Acquisition Modes
Program Controlled Mode
Channel selected and converted under program control.
Interrupt Controlled Mode
Each conversion initiated by timer or external trigger. At the
end of the conversion the sample is transferred to the FIFO
if the FIFO is enabled. Otherwise an interrupt request IRQ is
generated and the data word is immediately available for
transfer.
Channelling Mode
Group of channels between one and 16 for single- ended or
one and 8 for differential operation are selected in software.
Each group of conversions (scan) initiated by timer or
external trigger. After conversion the next channel in the
group is selected automatically by hardware. If the FIFO is
enabled all samples are passed to the FIFO after
processing. An interrupt is generated when the FIFO
reaches required level. If the FIFO is disabled, an interrupt
request is generated for each sample and the data is
immediately available for transfer.
Data Acquisition FIFO mode
If FIFO mode is selected, samples are passed to the 4096 sample
FIFO. An Interrupt is generated when sufficient data is collected in
the FIFO.
Programmable Gain
Gain of each channel set in software to gains is 1, 2, 4 or 8.
Data Acquisition Rate
Maximum sampling rate per channel
Single channel operation
500 kS/s
Two channel switched
125 kS/s
16 channels switched
15.6 kS/s
Maximum sample rate is reduced when switching channels
because extra time needs to be allowed for the amplifiers to settle
when the input channel is switched. The maximum data
acquisition rate may be limited by the performance of the host PC,
the operational mode of the and the program.
Typical maximum continuous useable sampling rates under
Windows 95, 98, NT, 2000 or XP allowing time to store samples to
disk in single channel operation are:
Software sampled
10 kS/s
FIFO mode
500 kS/s
Acquisition trigger
External digital trigger
Содержание PCI230+
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