National Instruments NI 435 Series, User Manual, Page: 56 / 77

Appendix A Specifications
NI 435x User Manual A-8 ni.com
Excitation
Note The exact value of the excitation current is stored on the hardware. NI-DAQ uses this
value when taking resistance measurements.
Number of channels................................2
)
Digital I/O and Alarm Outputs
Number of lines ......................................8
Compatibility ..........................................TTL
DIO<0..3/7>
±0.001% 3
±0.0004% 7
Parameter I
EX
or I
EX0
I
EX1
Level 25
µ
A 1 mA
1
Maximum Load
Resistance 600 k
Ω
15 k
Ω
Temperature
Coefficient ±15 ppm/ ° C ±15 ppm/ ° C
1
The 1 mA excitation level is only available on the NI 4351.
Level Minimum Maximum
Input low voltage 0.0 V 0.8 V
Input high voltage 2.0 V 5.0 V (V
CC
)
Input low current (V
in
= 5 V) — –10
µ
A
Input high current (V
in
= 5 V) — 10
µ
A)
Output low voltage (I
out
= 8 mA) — 0.4 V
Output high voltage (I
out
= 8 mA) 3.8 V —
Accuracy Time(s)