SCXI 16-Channel RTD Module
NI SCXI-1503
NEW!
• 16 channels of voltage or
resistive inputs
• Ideally suited for 2-, 3-, and 4-wire
RTD and thermistor measurements
• Programmable gain settings per channel
• 5 Hz filter per channel
• 100
μA
current excitation
• 333 kS/s maximum sampling rate
• NI-DAQmx driver software
simplifies configuration, scaling,
and measurements
Operating Systems
• Windows XP/2000/NT
Recommended Software
• LabVIEW
• LabWindows
™
/CVI
• Measurement Studio
Other Compatible Software
• Visual Basic, C, C++
Measurement Services
Software (included)
• NI-DAQmx driver software
• Measurement & Automation Explorer
configuration utility
Calibration Certificate Included
Overview
The National Instruments SCXI-1503 RTD module provides 16 differential
input channels, 16 channels of 100
μ
A current excitation, and one
cold-junction (CJ) sensor channel. The NI SCXI-1503 is ideally suited
for measuring resistive transducers, such as RTDs or thermistors. Each
channel has an amplifier with a selectable gain of 1 or 100 and a lowpass
filter with a 5 Hz cutoff frequency to reject 50/60 Hz noise. The SCXI-1503
can programmatically connect each input to ground, which greatly
improves its accuracy by enabling a self-calibration of each input to
reduce offset drift errors. You can multiplex several SCXI-1503 modules
and other SCXI modules into a single channel on the data acquisition
device, greatly increasing the number of analog input signals that you
can digitize. The SCXI-1306 is a front mounting terminal block that offers
screw-terminal connectivity for the SCXI-1503.
Current Source Operation
SCXI-1503 current sources continuously provide 16 channels of 100
μA
current excitation. These current sources are on whenever the SCXI
chassis is powered on. SCXI-1503 current sources are designed to be
accurate within ±0.05 percent of the specified value with a temperature
drift of no more than ±5 ppm/°C. The accuracy and stability of these
current sources make them especially well-suited to measuring
resistance to a high degree of accuracy.
Calibration
The SCXI-1503 is shipped with a calibration certificate and is calibrated
at the factory to the specifications described in
NI SCXI-1503
Specifications.
Calibration constants, stored inside the calibration
EEPROM, provide software correction values that your application
development software uses to correct the measurements for both offset
and gain errors in the module.
Analog Input
Each of the 16 differential analog input channels feeds to a separate
instrumentation amplifier with a programmable gain of 1 or 100. Each
channel has a fixed 100
μ
A current excitation. Then the signal passes
through a fixed two-pole, 5 Hz lowpass filter. The CJ sensor input
channel reads the sensor temperature from the terminal block. The
temperature sensor is for cold-junction compensation of thermocouple
measurements. The CJ sensor channel also passes through a 5 Hz
lowpass filter to reject unwanted noise on the SCXI-1503. Along with
the other 16 input channels, the CJ sensor is multiplexed to the output
buffer, where the data acquisition device can read it.
Measurement Services Software
NI-DAQmx measurement services software is included with all
National Instruments data acquisition and signal conditioning products.
This easy-to-use software tightly integrates the full functionality of your
NI data acquisition hardware with NI LabVIEW, LabWindows/CVI, and
Measurement Studio for Visual Basic software. High-performance
features include multidevice synchronization, networked measurements,
and DMA data management. Bundled with NI-DAQmx, the Measurement
& Automation Explorer (MAX) utility simplifies the configuration of your
measurement hardware with device test panels, interactive
SCXI 16-Channel RTD Module
measurements, and scaled I/O channels. NI-DAQmx also provides
numerous example programs for LabVIEW and other application
development environments to get you started with your application quickly.
Terminal Block
SCXI-1306
Part Number
779698-01
Type
Screw terminals/front mounting
Table 1. Terminal Block Option for SCXI-1503
Calibration
Source
AI 0 +
+
Inst.
Amp
Lowpass
Filter
Buffer
Buffer
AI 0 +
AI 0 –
AI GND
Switch
Mux
OUT REF
Rear Signal Connector
AI 0 –
Mux
–
Gain 0
32-to-1 Mux
AI 15 +
Figure 1. SCXI-1503 Block Diagram
Front Signal Connector
+
Inst.
Amp
Lowpass
Filter
Buffer
Switch
Switch
AI 15 –
–
Gain 31
IEX 0 +
100
μA
IEX 0 –
AB 0 +
AB 0
–
IEX 15 +
SCXIbus
Interface
SCXIbus Connector
100
μA
IEX 15 –
CJSENSOR
Input Select
Gain Select
Digital Interface
and Control
Calibration EEPROM
Input Protection
and Lowpass Filter
Buffer
Ordering Information
NI SCXI-1503 ........................................................................779638-01
NI SCXI-1306 (terminal block) ..............................................779698-01
For information on extended warranty and value-added services,
visit
ni.com/services.
BUY NOW!
For complete product specifications, pricing, and accessory
information, call 800 813 3693 (U.S.) or go to
ni.com/scxi.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
2
SCXI 16-Channel RTD Module
Specifications
>>
For complete specifications, see the
NI SCXI-1503 Specifications
Amplifier Characteristics
Input coupling .....................................
Input impedance
Normal powered on........................
Input bias current................................
CMRR characteristics (DC to 60 Hz)
Gain 1..............................................
DC
>1 GΩ
±2.8 nA
manual at
ni.com/manuals.
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
-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
μV
rms
Gain = 100
10 Hz to 1 MHz........................... 1
μV
rms
0.1 to 10 Hz ................................ 0.5
μV
pp
Transfer Characteristics
Nonlinearity......................................... 0.005% FSR
Input offset error (RTI)
Gain = 1
Calibrated
1
.................................. ±650
μV
max
±250
μV
typ
2
............. ±300
μV
max
With autozero enabled
±150
μV
typ
Gain = 100
Calibrated
1
.................................. ±25
μV
max
±10
μV
typ
2
............. ±10
μV
max
With autozero enabled
±5
μV
typ
Gain error (relative to calibration reference)
Gain = 1 or 100
Calibrated
1
.......................................... 0.074% of reading max
0.02% of reading typ
1
Assumes
2
Assumes
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
0.46
0.47
0.49
0.65
1.04
1,000 point average, 25 °C ±10 °C over one year.
1,000 point average, ±1 °C of autozero temperature.
RTD Measurement Accuracy
Measured
Temperature °C
-100 to 0
0 to 25
25 to 100
100 to 500
500 to 1200
100 W Max °C
0.60
0.62
0.69
1.11
2.06
100 W Typ °C
0.23
0.23
0.25
0.37
0.65
1000 W Max °C
1.09
1.11
1.20
1.68
2.81
1000 W Typ °C
Excitation
Channels..............................................
Current output.....................................
Accuracy..............................................
Temperature drift ................................
Output voltage compliance.................
Maximum resistive load .....................
Overvoltage protection .......................
Measurement Category ......................
16 single-ended outputs
100
μA
±0.05%
±5 ppm/°C
10 V
100 kΩ
±40 VDC
CAT I
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.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
3
SCXI 16-Channel RTD Module
Power Requirements from SCXI Backplane
V+ .................................................... 18.5 to 25 VDC, 170 mA
V- .................................................... -18.5 to -25 VDC, -170 mA
+5 V .................................................... +4.75 to 5.25 VDC, 50 mA
Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electrical equipment for measurement, control, and
laboratory use:
• EN 61326 EMC requirements; Minimum Immunity
• EN 55011 Emissions; Group 1, Class A
• CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
Note:
For EMC compliance, operate this device according to
product documentation.
Environmental
Operating temperature .......................
Storage temperature...........................
Humidity ..............................................
Maximum altitude...............................
Pollution degree (indoor use only)......
0 to 50 °C
-20 to 70 °C
10 to 90% RH, noncondensing
2,000 m
2
Physical
3.0 cm
(1.2 in.)
CE Compliance
This product meets the essential requirements of applicable European
Directives, as amended for CE marking, as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Note:
Refer to the Declaration of Conformity (DoC) for this product for
any additional regulatory compliance information. To obtain the DoC for
this product, visit
ni.com/certification,
search by model number or
product line, and click the appropriate link in the Certification column.
17.2 cm
(6.8 in.)
Waste Electrical and Electronic Equipment (WEEE)
EU Customers: At the end of their life cycle, all products must be
sent to a WEEE recycling center. For more information about WEEE
recycling centers and National Instruments WEEE initiatives, visit
ni.com/environment/weee.htm.
18.8 cm
(7.4 in.)
Figure 2. SCXI-1503 Dimensions
Weight................................................. 745 g (26.3 oz)
Maximum Working Voltage
Maximum working voltage refers to the signal voltage plus the common-
mode voltage.
Signal + common mode ...................... Each input should remain within
±10 V of AI GND
Safety
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement, control,
and laboratory use:
• IEC 61010-1, EN-61010-1
• UL 61010-1, CSA 61010-1
Note:
For UL and other safety certifications, refer to the product label or
visit
ni.com/certification,
search by model number or product line, and
click the appropriate link in the Certification column.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
4
NI Services and Support
NI has the services and support to meet
your needs around the globe and through
the application life cycle – from planning
and development through deployment
and ongoing maintenance. We offer
services and service levels to meet
customer requirements in research,
design, validation, and manufacturing.
Visit
ni.com/services.
Local Sales and Technical Support
In offices worldwide, our staff is local to the country, giving you access
to engineers who speak your language. NI delivers industry-leading
technical support through online knowledge bases, our applications
engineers, and access to 14,000 measurement and automation
professionals within NI Developer Exchange forums. Find immediate
answers to your questions at
ni.com/support.
We also offer service programs that provide automatic upgrades to
your application development environment and higher levels of technical
support. Visit
ni.com/ssp.
Training and Certification
NI training is the fastest, most certain route to productivity with our
products. NI training can shorten your learning curve, save development
time, and reduce maintenance costs over the application life cycle. We
schedule instructor-led courses in cities worldwide, or we can hold a
course at your facility. We also offer a professional certification program
that identifies individuals who have high levels of skill and knowledge on
using NI products. Visit
ni.com/training.
Hardware Services
NI Factory Installation Services
NI Factory Installation Services (FIS) is the fastest and easiest way to
use your PXI or PXI/SCXI combination systems right out of the box.
Trained NI technicians install the software and hardware and configure
the system to your specifications. NI extends the standard warranty by
one year on hardware components (controllers, chassis, modules)
purchased with FIS. To use FIS, simply configure your system online
with
ni.com/pxiadvisor.
Professional Services
Our NI Professional Services team is composed of NI applications
and systems engineers and a worldwide National Instruments Alliance
Partner program of more than 600 independent consultants and
integrators. Services range
from start-up assistance to
turnkey system integration.
Visit
ni.com/alliance.
Calibration Services
NI recognizes the need to maintain properly calibrated devices for
high-accuracy measurements. We provide manual calibration
procedures, services to recalibrate your products, and automated
calibration software specifically designed for use by metrology
laboratories. Visit
ni.com/calibration.
OEM Support
We offer design-in consulting and product integration assistance if you
want to use our products for OEM applications. For information about
special pricing and services for OEM customers, visit
ni.com/oem.
Repair and Extended Warranty
NI provides complete repair services for our products. Express repair
and advance replacement services are also available. We offer
extended warranties to help you meet project life-cycle requirements.
Visit
ni.com/services.
ni.com
• 800 813 3693
National Instruments • info@ni.com
*351537A-01*
351537A-01
2007-9254-321-101-D
© 2007 National Instruments Corporation. All rights reserved. CVI, LabVIEW, Measurement Studio, National Instruments, National Instruments Alliance Partner, NI, ni.com, and SCXI are
trademarks of National Instruments. The mark LabWindows is used under a license from Microsoft Corporation. Other product and company names listed are trademarks or trade names
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