National Instruments NI USB-621x 170

Index

AI Sample Clock Timebase, 4-16 AI Start Trigger, 4-21

analog output, 7-1 circuitry, 7-1 connecting signals, 7-4

data generation methods, 7-2 fundamentals, 7-1

getting started with applications in software, 7-9

glitches on the output signal, 7-2 timing signals, 7-5 triggering, 7-4 troubleshooting, B-3

analog output data generation, 7-2 analog output signals, 7-5

AO Pause Trigger, 7-6

AO Sample Clock, 7-7

AO Sample Clock Timebase, 7-8 AO Start Trigger, 7-5

analog output trigger signals, 7-4 analog to digital converter, 4-2ANSI C documentation, xv

AO Pause Trigger signal, 7-6 AO range, 7-2

AO Sample Clock, 7-2 Timebase signal, 7-8

AO sample clock signal, 7-7

AO Sample Clock signal, 7-7

AO Sample Clock Timebase signal, 7-8 AO Start Trigger signal, 7-5 ao/PauseTrigger, 7-6 ao/SampleClock, 7-7 ao/StartTrigger, 7-5

applications counter input, 9-2 counter output, 9-20 edge counting, 9-2

arm start trigger, 9-31

avoiding scanning faster than necessary, 4-8

B

buffered edge counting, 9-3non-cumulative,9-4

buffered hardware-timed acquisitions, 4-10 buffered hardware-timed generations, 7-3 buffered period measurement, 9-7 buffered pulse-width measurement, 9-5 buffered semi-period measurement, 9-9 buffered two-signaledge-separation

measurement, 9-19bus

interface, 13-1

C

calibration, 2-2

calibration certificate (NI resources), C-2 calibration circuitry, 2-2

cascading counters, 9-33changing data transfer methods

between USB signal stream and programmed I/O, 13-2

channel scanning order, 4-7 channel Z behavior, 9-17channels

sampling with AI Sample Clock and AI Convert Clock, B-2

charge injection, B-1

choosing frequency measurement, 9-13circular-buffered acquisition, 4-10clock

generation, 12-1 sample, 9-32

common-mode noise, 11-2

configuring AI ground-reference settings in software, 4-5

connecting

analog input signals, 5-1,6-1 analog output signals, 7-4 digital I/O signals, 8-3 floating signal sources, 5-3

NI USB-621x User Manual

I-2

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