Measurement Computing ADAC-LVi - Manual (Page 47)

Chapter 2 Utility Analog Input VIs
ADAC LabVIEW VI 41
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Channel List (0 (1)) Channel List is a string that specifies the analog input channel
numbers to acquire data from. Channel List is typically set to acquire multiple channels,
but may be used to collect single channels into its two dimensional array.
For boards that support input gain the channel list also specifies a separate gain value for
each channel. Gains are specified in parentheses after the channel number. For example,
"0(1),1(8),2(4)" is interpreted as channel 0 at a gain of 1, channel 1 at a gain of 8 and
channel 2 at a gain of 4.
Clock Source (Internal:1) Clock Source is a numeric value that sets the hardware
clocking source. The available options are:
0:SOFTWARE_CONVERT Software clocked acquisition, supported by all A/D's.
1:INTERNAL On-board clocking acquisition, supported by A/D's with DMA, Interrupt
or FIFO capabilities.
2:EXT_RISING_EDGE External clocking rising edge, supported by A/D's with DMA,
Interrupt or FIFO capabilities.
3:EXT_FALLING_EDGE External clocking falling edge, supported by A/D's with
DMA, Interrupt or FIFO capabilities.
4:MMTIMER Multi-Media system timer, supported by the 4012AD and 4112AD series
in the Windows 95/98 environment only.
The default Clock Source is 0:SOFTWARE_CONVERT
Sample Rate (Hertz:1000) Sample rate is the requested number of samples per second
the VI acquires from the specified channel. This parameter defaults to a rate of 1000.00
samples per second.
Number of Buffers(1) Specifies the number of buffers the VI allocates. This parameter
defaults to 1, and should only be changed for multi-buffered acquisitions.
Number of Samples (1000) Number of samples is the number of single-channel samples
the VI acquires before the acquisition completes. This parameter defaults to 1000.
Timeout limit (sec) Time Limit in Seconds specifies the maximum length of time this VI
waits for a done buffer. You express time limit in seconds. If this VI does not receive a
completed buffer status prior to the timeout period, the VI returns an error.
Output Units (scaled:0) Output Units specifies whether the VI returns unscaled binary
data or scaled voltage data.