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Appendix A
Specifications
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)