Spectrum Controls 1746sc-INI4vi - Manual (Page 13)

Chapter 1: Overview And Specifications 9
Table 3. Electrical specifications—inputs
Input Current Ranges 4 to 20 mA
(selectable for each channel) 0 to 20 mA
Input Voltage Ranges—INI4vi only
(selectable for each channel)
-10 to +10 Vdc
0 to 10 Vdc
0 to 5 Vdc
1 to 5 Vdc
SLC Communication Formats
(selectable for each channel)
Scaled engineering units
Scaled for PID
Proportional counts
1746-NI4 format
User-defined scale A
User-defined scale B
Input Impedance
Current Inputs Less than 250
Ω
Voltage Inputs—INI4vi only Greater than 220 k
Ω
Input Overcurrent Protection 70 mA non-continuous
33 mA continuous
Input Overvoltage Protection—INI4vi only 50 Vdc continuous
Input Filter 3 dB Cut-Off Frequencies 13.1 Hz for 50 Hz filter
(selectable for each channel) 15.7 Hz for 60 Hz filter
65.5 Hz for 250 Hz filter
131 Hz for 500 Hz filter
Input Step Response Time 80 ms for 50 Hz filter
66.7 ms for 60 Hz filter
16 ms for 250 Hz filter
8 ms for 500 Hz filter
Channel Update Time (minimum)
Current Inputs 14 ms with 500 Hz filters and all channels enabled
Voltage Inputs—INI4vi only 18 ms with 500 Hz filters and all channels enabled
Input Resolution (maximum) 16-bit
Current Inputs 312.8 nA/count
Voltage Inputs—INI4vi only 312.8
µ
V/count
Overall Accuracy
Current Inputs 0. 1 5% of full scale @ 25
°
C
0. 25 % of full scale @ 60
°
C
Voltage Inputs—INI4vi only 0. 1 0% of full scale @ 25
°
C
0.25% of full scale @ 60
°
C
Overall Drift
Current Inputs Offset:
±
539 nA/
°
C
Gain:
±
50.5 ppm/
°
C
Voltage Inputs—INI4vi only Offset:
±
352
µ
V/
°
C
Gain: 34.8 ppm/
°
C