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© National Instruments Corporation 71 NI cDAQ-9172 User Guide and Specifications
Debounce filter settings .........................Selectable per input:
125 ns, 6.425 µs, 2.54 ms, disable,
high and low transitions
Timing input frequency.......................... 0 to 20 MHz
Timing output frequency........................0 to 20 MHz
General-Purpose Counter/Timers (Slots 5 and 6 Only)
1
Number of counter/timers ...................... 2
Resolution .............................................. 32 bits
Counter measurements........................... Edge counting, pulse,
semi-period, period, two-edge
separation
Position measurements........................... X1, X2, X4 quadrature encoding
with Channel Z reloading;
two-pulse encoding
Output applications ................................ Pulse, pulse train with dynamic
updates, frequency division,
equivalent time sampling
Internal base clocks................................ 80 MHz, 20 MHz, 100 kHz
External base clock frequency ............... 0 to 20 MHz
Base clock accuracy............................... 50 ppm
Output frequency.................................... 0 to 20 MHz
Inputs......................................................Gate, Source,
HWarm, Aux, A, B,
Z, Up_Down
Routing options for inputs...................... Any PFI, analog trigger,
many internal signals
FIFO....................................................... 2 samples
Data transfers ......................................... High-speed data stream,
programmed I/O
1
Requires correlated digital I/O modules installed in the appropriate slot(s).