High-Precision Data Acquisition
NI PCI-4351, NI PXI-4351
◾
◾
Temperature and voltage loggers
◾
◾
Accuracy – 0.42 °C for J-type
thermocouples, 0.03 °C for
thermistors, 0.12 °C for RTDs
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◾
16 voltage or 12 thermocouple
inputs; up to 60 readings/s
◾
◾
8 digital I/O lines (TTL)
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Autozero and cold-junction
compensation
Operating Systems
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Windows XP/2000/NT
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LabVIEW Real-Time
Recommended Software
◾
◾
LabVIEW
◾
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LabWindows
™
/CVI
◾
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Measurement Studio
Driver Software (included)
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◾
NI-435x instrument driver
◾
◾
Traditional NI-DAQ (Legacy)
Family
NI 4351
Bus
PCI, PXI
Voltage/
(Thermocouple)
Channels
16/(14)
RTD
Accuracy
(°C)
0.12
Thermistor
Accuracy
(°C)
0.03
reject 50, 60, and 400 Hz noise, based on the reading rate. The input circuitry
Resistance
Measurement
Excellent
delivers ±42 V overvoltage protection and per-channel lowpass, antialiasing
filters. An NI 4351 device features software-selectable ground referencing
on a channel-by-channel basis, so you can measure both floating and ground-
referenced signals together; it also features per-channel open-thermocouple
detection. When open-thermocouple detection is enabled, the input channel is
connected to +2.5 VDC through a 10 MΩ resistor. When a thermocouple breaks
or is disconnected, the reading rapidly increases to 100 mV or more, indicating
an open-circuit condition.
Table 1. High-Precision DAQ Selection Guide
Overview
The NI PCI-4351 and PXI-4351 are precision computer-based digitizers designed
specifically for high-accuracy temperature measurements (thermocouples,
RTDs, thermistors), resistance measurements, chromatography measurements,
and low-frequency analog signal measurements within ±15 V. Available for
PCI and PXI/CompactPCI, these devices feature ±0.42 °C, J-type thermocouple
accuracy; ±0.12 °C RTD accuracy; ±0.03 °C thermistor accuracy; 5½-digit voltage
measurements; power line noise rejection filters; and precision current source
for RTD and thermistor excitation. NI 4351 devices combine the functionality
of stand-alone temperature and voltage meters and chromatographs with
the flexibility and benefits of your computer, so you can build highly capable
computer-based data-logging systems. As with all computer-based digitizers,
NI 4351 devices can easily integrate into your Internet-based applications.
Precision Current Excitation
These devices feature a 25 μA precision current source for excitation
of RTDs, thermistors, or other resistive devices. The source excites the total
system resistance of up to 600 kΩ. An NI 4351 also features an additional
1 mA precision current source for RTDs or other resistive devices for total system
resistance of up to 15 kΩ.
Digital I/O and Alarm Outputs
An NI 4351 has eight 5 V/TTL digital lines. You can individually configure each
line as an input or an output. You can use the lines as general-purpose digital I/O
or as control lines for alarms. Each line sinks or sources 8 mA. With the TBX-68T
or CB-68T, you can increase the sinking and sourcing capability of these digital
lines to 64 and 15 mA, respectively. With digital signal conditioning accessories,
such as the ER-8, SSR Series, and the SC-206x, you can use an NI 4351 to
control relays and drive optically isolated digital I/O.
Hardware
Precision Analog Input
NI 4351 devices have 16 differential analog inputs. Each device has a 24-bit
analog-to-digital converter (ADC) and six possible reading rates – 10, 50, and
60 readings/s in single-channel acquisition mode and 2.8, 8.8, and 9.7 total
readings/s in multiple-channel acquisition mode. For channel speed, divide the
total readings/s by the number of channels acquired. Digital filters automatically
High-Precision Data Acquisition
I/O Connector
NI 4351 devices have a 68-pin shielded latched male connector. ACH±<0..7⁄15>
are the 8/16 differential analog input channels. AGND is the analog ground.
IEX±<0..1> are for the current excitation sources (25 μA and 1 mA). DIO<0..3⁄7>
are the TTL lines and are referenced to DGND.
Recommended Accessories
You can choose from several accessories, shown in Table 2, to accurately
measure temperature, voltage, or resistance.
Measurement Type
Thermocouple only
Voltage, resistance,
chromatography only
Temperature,
voltage, resistance,
chromatography
NI 435x Platforms
PCI, PXI
PCI, PXI
PCI, PXI
Accessory
TC-2190 and SH6868 cable
TBX-68 and SH6868 cable
TBX-68T and SH6868 cable;
CB-68T with CA-1000 and SH6868 cable
Software
Instrument Driver
Use the NI-435x instrument driver to integrate a device into your test software.
The instrument driver works with:
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NI LabVIEW
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◾
NI Measurement Studio
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Visual C/C++
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◾
Visual Basic
With a computer-based NI 4351 device, you can create distributed measurement
systems with ease, taking full advantage of the Web.
Table 2. NI 435x Accessory Selection Guide
Ordering Information
NI PCI-4351 ....................................................................................777789-01
NI PXI-4351 ....................................................................................777790-01
Includes instrument driver.
For more 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/daq.
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93 (U.S.)
2
High-Precision Data Acquisition
TC-2190
– Shielded, rack-mount adapter with 14 thermocouple miniconnectors,
spring terminals for four digital I/O lines, isothermal construction, a cold-junction
sensor on channel 0, and autozeroing circuitry on channel 1. Use with the
SH6868 shielded cable.
TC-2190 .................................................777510-01
TBX-68T, CB-68T
– 68-pin, DIN-rail mountable terminal block with screw
terminals for 14 unconditioned temperature, voltage, or resistance signals as
well as for excitation. The TBX-68T also has eight digital I/O lines, isothermal
design for cold-junction compensation, and autozeroing circuitry on channel 1.
The CB-68T is similar to the TBX-68T but is designed to mount inside the
CA-1000 custom connectivity enclosure.
Both the TBX-68T and CB-68T provide circuitry to increase your sinking and
sourcing capabilities to 64 and 15 mA, respectively. They also have two 26-pin
connectors to which you can connect digital signal conditioning accessories such
as the SSR-8, ER-8, and the SC-206x.
TBX-68T .................................................777232-01
CB-68T ...................................................777926-01
TBX-68
– General-purpose terminal block to which you can connect up to 16
unconditioned analog signals as well as excitation and digital signals. Use the
TBX-68 with the SH6868 shielded cable.
TBX-68 ...................................................777141-01
SH6868
– 68-pin shielded cable terminated with two 68-pin 0.050 series D-type
connectors. The cable is used to connect an NI 4351 device to 68-pin accessories
such as the TC-2190, TBX-68T, TBX-68, and CB-68T.
1 m ......................................................182419-01
2 m ......................................................182419-02
TC-2190
TBX-68T
CB-68T and CA-1000
TBX-68
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3
High-Precision Data Acquisition
Specifications
»
For complete specifications, see the
NI 435x User Manual
at
ni.com/manuals
.
Thermistor Accuracy
Temperature .........................................
Error ......................................................
Temperature coefficient .......................
Temperature
Coefficient
(°C/°C)
0.02
Accessory
Error
(°C)
0.25
0 to 50 °C
0.03 °C
0.001 °C/°C
Thermocouple Accuracy
Error (°C)
TC Type
J
°C
-100
0
760
K
-100
0
1,000
1,372
N
-100
0
400
1,300
E
-100
0
500
1,000
T
-150
0
400
R
250
1,000
1,767
S
250
1,000
1,767
B
600
1,000
1,820
10 Hz
0.53
0.42
0.42
0.60
0.45
0.60
0.74
0.68
0.54
0.42
0.57
0.55
0.41
0.35
0.46
0.81
0.46
0.33
0.82
0.72
0.91
0.91
0.77
0.96
1.08
0.76
0.74
50 Hz
0.61
0.49
0.47
0.72
0.54
0.69
0.84
0.84
0.67
0.51
0.66
0.62
0.46
0.40
0.50
0.96
0.55
0.39
1.16
0.99
1.19
1.28
1.05
1.27
1.64
1.14
1.05
60 Hz
0.74
0.59
0.55
0.89
0.67
0.81
0.99
1.08
0.86
0.65
0.80
0.74
0.55
0.46
0.57
1.17
0.68
0.47
1.65
1.37
1.60
1.83
1.47
1.72
2.47
1.69
1.50
0.11
0.00
0.07
0.13
0.06
0.12
0.03
0.36
0.02
0.28
0.03
0.26
0.03
0.27
Resistance Accuracy and DC Voltage Accuracy
For detailed resistance accuracy and DC voltage accuracy specifications,
see the
NI 435x User Manual
at
ni.com/manuals
.
Analog Input
Input characteristics
Number of channels .........................
Digits.................................................
Type of ADC ......................................
ADC resolution..................................
Calibration cycle ...............................
Mode
Single channel
10
50
60
Multiple-channel
2
scanning
2.8 (1.4
1
)
8.8 (2.1
1
)
9.7 (2.1
1
)
Resistance ranges >50 k
Total number of readings per second (for single-channel speed, divide by the
number of channels acquired)
1
2
16 differential or 14 temperature
5½
Delta-sigma
24 bits, no missing codes
1 year
Power Line Noise Rejection (Hz)
50, 60, 400
50, 400
60
50, 60, 400
50, 400
60
Reading Rate (Readings/s)
Reading Rates
Input coupling........................................
Range >2.5 V.....................................
Range ≤2.5 V ....................................
Overvoltage protection
(ACH<0..8/15>, IEX± <0..1>) .............
±42 V powered on, ±17 V powered off
Interrupts, programmed I/O
30 minutes
Data transfers .......................................
60 Hz
I
EX11
0.07
0.14
0.18
0.26
0.39
I
EX02
1.81
2.00
2.10
2.32
2.69
Temperature
Coefficient
(°C/°C)
0.02
–
–
–
–
DC
Each input should remain
within ±15 V of ground
Each input should remain
within ±2.5 V of ground
Maximum working voltage (signal + common mode)
RTD Accuracy
Error (°C) (100 Ω RTD)
10 Hz
°C
-200
0
100
300
600
1
50 Hz
I
EX02
1.00
1.14
1.22
1.38
1.66
I
EX11
0.06
0.13
0.17
0.24
0.37
I
EX02
1.33
1.49
1.58
1.76
2.08
Warm-up time .......................................
I
EX11
0.05
0.12
0.16
0.23
0.36
Amplifier Characteristics
Input impedance
Normal powered on ..........................
Powered off ......................................
Overload............................................
>1 GΩ in parallel with 0.39 µF
10 kΩ
10 kΩ
With 100 Ω RTD, 25 µA current source.
2
With 100 Ω RTD, 1 mA current source (NI 4351 only) .
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High-Precision Data Acquisition
Open-thermocouple detection ..............
Ground-referencing ...............................
Input bias current ..................................
CMR (DC, 50 Hz, 60 Hz, 400 Hz)
Range ≥2.5 V ....................................
Range <2.5 V.....................................
NMR (50 Hz, 60 Hz, 400 Hz) ..................
80 dB
100 dB
>100 dB
10 MΩ between CH+ and +2.5 V
(software selectable)
10 MΩ between CH- and ground
(software selectable)
<500 pA
Safety and Compliance
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.
Dynamic Characteristics
Bandwidth .............................................
20 Hz
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
Excitation
Parameter
±Ex0
±Ex1
Level
25 µA
1 mA
Maximum Load Resistance
600 kΩ
15 kΩ
Temperature Coefficient
±15 ppm
±15 ppm
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◾
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.
Digital I/O and Alarm Outputs
Number of lines ....................................
Compatibility .........................................
8
TTL
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.
Digital Logic Levels
Power-on state ......................................
Data transfers .......................................
Bus interface .........................................
Tristate (weak pull-up)
Programmed I/O
PCI, PXI, USB
Power Requirements
+5 VDC
PCI-4351............................................
PXI-4351............................................
480 mA
480 mA
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,
Physical
Dimensions
PCI .....................................................
PXI .....................................................
I/O connector.........................................
11.2 by 18.8 cm (4.4 by 7.4 in.)
10.0 by 16.0 cm (3.9 by 6.3 in.), 3U
68-pin male, shielded and latched
visit
ni.com/environment/weee.htm
.
Environment
Operating temperature..........................
Storage temperature .............................
Relative humidity ..................................
0 to 55 °C
-20 to 70 °C
10 to 90%, noncondensing
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