SCXI 16-Channel RTD Module

3

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Specifications

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For complete specifications, see the

NI SCXI-1503 Specifications

Specifications are typical at 25 °C unless otherwise noted. Specifications

do not include transducer error.

Input Characteristics

Number of channels............................

16 differential

Input coupling .....................................

DC

Input signal ranges .............................

±100 mV (gain = 100) or

±10 V (gain = 1)

Input overvoltage protection

Powered on.....................................

±42 VDC

Powered off ....................................

±25 V

Inputs protected..............................

AI<0..15>

CJ sensor input protection .............

±15 VDC powered on or off

Transfer Characteristics

Nonlinearity.........................................

0.005% FSR

Input offset error (RTI)

Gain = 1

±650

μV max

±250

μV typ

±300

μV max

±150

μV typ

Gain = 100

±25

μV max

±10

μV typ

±10

μV max

±5

μV typ

Gain error (relative to calibration reference)

Gain = 1 or 100

0.074% of reading max

0.02% of reading typ

1

Assumes 1,000 point average, 25 °C ±10 °C over one year.

2

Assumes 1,000 point average, ±1 °C of autozero temperature.

RTD Measurement Accuracy

Notes: The accuracies in this table reflect using the module in 4-wire

mode. They do not include errors from the RTD such as lead-wire errors

when using 2- or 3-wire connections. The accuracies assume autozero

is enabled and the environmental conditions are 25 °C ±10 °C over a

one-year period.

These accuracies were computed using a standard RTD with a TCR

of 3851.

Amplifier Characteristics

Input coupling .....................................

DC

Input impedance

Normal powered on........................

>1 G

Ω

Input bias current................................

±2.8 nA

CMRR characteristics (DC to 60 Hz)

Gain 1..............................................

-75 dB min

-90 dB typ

Gain 100..........................................

-106 dB min

-110 dB typ

Output range .......................................

±10 V

Output impedance...............................

91

Ω

Dynamic Characteristics

Minimum scan interval (per channel, any gain)

±0.012% accuracy ..........................

3

μs

±0.0061% accuracy ........................

10

μs

±0.0015% accuracy ........................

20

μs

Noise characteristics (RTI)

Gain = 1

10 Hz to 1 MHz...........................

100

Gain = 100

10 Hz to 1 MHz...........................

1

0.1 to 10 Hz ................................

0.5

Filter

Cutoff frequency (-3 dB)......................

5 Hz

NMR (60 Hz)........................................

-40 dB min

Step response characteristics (gain 1 or 100)

To 0.0015%.....................................

0.6 s

Stability

Recommended warm-up time.............

20 min

Offset temperature coefficient

Gain = 1 ..........................................

±35

μV/°C max

±10

μV/°C typ

Gain = 100 ......................................

±1.5

μV/°C max

±0.5

μV/°C typ

Gain temperature coefficient

(gain 1 or 100).................................

±15 ppm/°C max

±5 ppm/°C typ

Excitation

Channels..............................................

16 single-ended outputs

Current output .....................................

100

μA

Accuracy..............................................

±0.05%

Temperature drift ................................

±5 ppm/°C

Output voltage compliance.................

10 V

Maximum resistive load .....................

100 k

Ω

Overvoltage protection .......................

±40 VDC

Measurement Category ......................

CAT I

Measured

Temperature °C

100 W Max °C

100 W Typ °C

1000 W Max °C

1000 W Typ °C

-100 to 0

0.60

0.23

1.09

0.46

0 to 25

0.62

0.23

1.11

0.47

25 to 100

0.69

0.25

1.20

0.49

100 to 500

1.11

0.37

1.68

0.65

500 to 1200

2.06

0.65

2.81

1.04