25
Publication 1747-SG001D-EN-P — January 2009
RTD/Resistance Input Modules
Cat. No.
1746-NR4
1746-NR8
Backplane Current (mA) at 5V
50 mA
100 mA
Backplane Current (mA) at 24V
50 mA
55 mA
Number of Inputs
4
8
Input Type
100
Ω
Platinum (385)
200
Ω
Platinum (385)
500
Ω
Platinum (385)
1000
Ω
Platinum (385)
100
Ω
Platinum (3916)
200
Ω
Platinum (3916)
500
Ω
Platinum (3916)
1000
Ω
Platinum (3916)
10
Ω
Copper (426)
120
Ω
Nickel (618)
120
Ω
Nickel (672)
604
Ω
Nickel-Iron (518)
150
Ω
Resistance Input
500
Ω
Resistance Input
1000
Ω
Resistance Input
3000
Ω
Resistance Input
100
Ω
Platinum (385)
200
Ω
Platinum (385)
500
Ω
Platinum (385)
1000
Ω
Platinum (385)
100
Ω
Platinum (3916)
200
Ω
Platinum (3916)
500
Ω
Platinum (3916)
1000
Ω
Platinum (3916)
10
Ω
Copper (426)
120
Ω
Nickel (618)
120
Ω
Nickel (672)
604
Ω
Nickel-Iron (518)
150
Ω
Resistance Input
500
Ω
Resistance Input
1000
Ω
Resistance Input
3000
Ω
Resistance Input
Temperature Scale (selectable)
1 °C or 1 °F and 0.1 °C and 0.1 °F
Resistance Scale (selectable)
1
Ω
or 0.1
Ω
for all resistance ranges; or
0.1
Ω
or 0.01
Ω
for 150
Ω
potentiometer
Filter Frequency
(Selectable Filter)
10 Hz
50 Hz
60 Hz
250 Hz
28 Hz
50/60 Hz
800 Hz
6400 Hz
RTD Excitation Current
(Two current values are user-selectable)
0.5 mA
✶
2.0 mA
0.25 mA
✶
1.0 mA
Open-circuit or Short-circuit
Detection
Zero, upscale or downscale
Maximum Cable Impedance
25
Ω
maximum per 308.4 m (1000 ft)
Data Formats
Raw/Proportional, Engineering Units, Engineering Units x 10, Scaled-for-PID
Calibration
Autocalibration at power-up and when a channel is enabled
Autocalibration at power-up and user-enabled periodic calibration
Isolation Voltage,
Channel-to-Channel
None
±5V
Isolation Voltage, Input to Backplane
500V ac for 1 minute
Common Mode Voltage Separation
±1V maximum
✶
Cannot use for 10
Ω
Copper RTD. Recommended for use with higher resistance ranges for both RTDs and direct response inputs (1000
Ω
RTDs and 3000
Ω
resistance input). Contact the
RTD manufacturer for recommendations.
Must use for 10
Ω
Copper RTD. Recommended for use with all other RTD and direct resistance inputs, except 1000
Ω
RTDs and 3000
Ω
resistance ranges. Contact RTD manufacturer for
recommendations.
RTD Channel Step Response for 1746-NR4 and 1746-NR8
1746-NR4
1746-NR8
Filter
Frequency
50 Hz
NMR
60 Hz
NMR
Cut-off
Frequency
Step
Response
Filter
Frequency
50 Hz
NMR
60 Hz
NMR
Cut-off
Frequency
Step
Response
10 Hz
100 dB
2.62 Hz
300 ms
28 Hz
110 dB
95 dB
7.8 Hz
120 ms
50 Hz
100 dB
⎯
13.1 Hz
60 ms
50/60 Hz
65 dB
13.65 Hz
68.6 ms
60 Hz
⎯
100 dB
15.72 Hz
50 ms
800 Hz
⎯
⎯
209.8 Hz
3.75 ms
250 Hz
⎯
⎯
65.5 Hz
12 ms
6400 Hz
⎯
⎯
1677 Hz
1.47 ms
Update Time for 1746-NR4 and 1746-NR8
1746-NR4
1746-NR8
Filter Frequency Channel Scan Time
✶
Filter Frequency
Channel Scan Time
With Lead Resistance Measurement
10 Hz
305 ms
28 Hz
125 ms
250 ms
50 Hz
65 ms
50/60 Hz
75 ms
147 ms
60 Hz
55 ms
800 Hz
10 ms
18 ms
250 Hz
17 ms
6400 Hz
6 ms
10 ms
✶
The module-scan time is obtained by summing the channel-scan time for each enabled channel. For example, if 3 channels are enabled and the 50 Hz filter is selected, the module-scan time
is 3 x 65 ms = 195 ms.
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