Chapter 4 Functional Details; Theory Of Operation - Analog Input Acquisition Modes; Software Paced Mode; Continuous Scan Mode - Measurement Computing miniLAB 1008 User Manual

Usb device for analog and digital i/o

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Functional Details

The miniLAB 1008 can acquire analog input data in three different modes – software

paced, continuous scan, and burst scan.

In software paced mode, the miniLAB 1008 gathers data in a single acquisition or as a

group of single acquisitions. An analog-to-digital conversion is initiated with a software

command, and the single data point result is returned to the host. This operation may be

repeated until the required number of samples is obtained for the channel (or channels)

in use. Software pacing is limited by the 20 mS round-trip requirement of a USB

interrupt-type endpoint operation. This yields a maximum throughput in software paced

mode of 50 S/s.

In continuous scan mode, the miniLAB 1008 gathers data in a single-channel or multi-

channel sequence. This sequence converts, transfers, and stores data to a user buffer

until the scan is stopped. In this mode, digitized data is continuously written to an on-

board FIFO buffer. This FIFO is serviced in blocks as the data is transferred from the

miniLAB 1008 to the user buffer in the host PC.

The maximum continuous scan rate of 1.2 kS/s is an aggregate rate. The total acquisition

rate for all channels cannot exceed 1.2 kS/s. You can acquire data from one channel at

1.2 kS/s, two channels at 600 S/s and four channels at 300 S/s. You can start a

continuous scan with either a software command or with an external hardware trigger

event.

In burst scan mode, the miniLAB 1008 gathers data using the full capacity of its 4K

sample FIFO buffer. You can initiate a single acquisition sequence of one or more

channels by either a software command or an external hardware trigger. The captured

data is then read from the FIFO and transferred to a user buffer in the host PC.

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Chapter 4

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