Index
NI USB-621x User Manual I-2 ni.com
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, 4-2
ANSI C documentation, xv
AO FIFO, 7-1
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, 9-3
non-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-signal edge-separation
measurement, 9-19
bus
interface, 13-1
C
calibration, 2-2
calibration certificate (NI resources), C-2
calibration circuitry, 2-2
cascading counters, 9-33
changing data transfer methods
between USB signal stream and
programmed I/O, 13-2
channel scanning order, 4-7
channel Z behavior, 9-17
channels
sampling with AI Sample Clock and AI
Convert Clock, B-2
charge injection, B-1
choosing frequency measurement, 9-13
circular-buffered acquisition, 4-10
clock
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
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