National Instruments NI 951x, Руководство пользователя, Страница: 60 / 79

Appendix A Specifications
NI 951x User Manual A-4 ni.com
Position capture input
Digital logic levels
Voltage .....................................–0.25 to 5.25 V
High, V
IH
..................................2.0 V min
Low, V
IL
...................................0.8 V max
Input current
(0 V
≤
V
in
≤
4.5 V) ........................±2 mA max
Min pulse width
2
.............................100 ns
Max capture latency ........................200 ns
Capture accuracy .............................±1 count
Active edge ......................................Programmable: rising edge or
falling edge
Position compare outputs
High, V
OH
........................................5.25 V max
Sourcing 12 mA .......................3.7 V min
Sourcing 4 mA .........................3.9 V min
Low, V
OL
Sinking 12 mA .........................0.7 V max
Sinking 4 mA ...........................0.5 V max
Compare mode.................................Programmable: single or periodic
Compare action................................Programmable: set, toggle, or
pulse
Max compare rate (periodic) ...........5 MHz
Pulse width (programmable)
Min ...........................................100 ns
Max...........................................1.6 ms
Active state...............................Programmable: high or low
Digital I/O
Inputs
Number of inputs
NI 9512.....................................4
NI 9514 and NI 9516................2
Input type.........................................Programmable: sinking or
sourcing