High-Precision Data Acquisition
NI 435x
• Temperature and voltage loggers
• Accuracy – 0.42 °C for J-type
thermocouples, 0.03 °C for
thermistors, 0.12 °C for RTDs
• 16 voltage or 12 thermocouple
inputs; up to 60 readings/s
• 8 digital I/O lines (TTL)
• Autozero and cold-junction
compensation
Operating Systems
• Windows 2000/NT/XP
• LabVIEW Real-Time
Recommended Software
• LabVIEW
• LabWindows/CVI
• Measurement Studio
• VI Logger Full
Driver Software (included)
• NI 435x instrument driver
• Traditional NI-DAQ (legacy)
Family
NI 4350
NI 4351
Bus
USB
PCI, PXI
Voltage/
(Thermocouple)
Channels
16/(14)
16/(14)
RTD
Accuracy (˚C)
1.14
0.12
Thermistor
Accuracy (˚C)
0.03
0.03
Resistance
Measurement
Good
Excellent
Table 1. High-Precision DAQ Selection Guide
Overview
The National Instruments 4350 and 4351 are precision computerbased digitizers designed specifically for high-accuracy temperature
measurements (thermocouples, RTDs, thermistors), resistance
measurements, chromatography measurements, and for measuring
low-frequency analog signals within ±15 V. The NI 435x devices
are available for PCI, PXI/CompactPCI, and USB. They feature
±0.42 °C, J-type thermocouple accuracy, ±0.12 °C RTD accuracy
(NI 4351), ±0.03 °C thermistor accuracy, 51⁄2-digit voltage
measurements, power line noise rejection filters, and precision
current source for RTD and thermistor excitation. The NI 435x
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, the NI 435x
devices can easily integrate into your Internet-based applications.
Hardware
Precision Analog Input
NI 435x 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 reject 50, 60, and
400 Hz noise, based on the reading rate. The input circuitry delivers
±42 V overvoltage protection and per-channel lowpass, antialiasing
filters. NI 435x devices feature software-selectable ground
referencing on a channel-by-channel basis, so you can measure both
floating and ground-referenced signals together; they also
feature per-channel open-thermocouple detection. When openthermocouple 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.
Precision Current Excitation
NI 435x 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. NI 4351 devices
also feature 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
NI 435x devices have 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 mA and 15 mA, respectively.
With digital signal conditioning accessories, such as the ER-8,
SSR Series, and the SC-206x, you can use the NI 435x products to
control relays and drive optically isolated digital I/O.
USB Cables for the USB-4350
The USB-4350 includes a 1 m USB cable. Because the USB-4350
draws power from USB, no external power supply is needed.
High-Precision Data Acquisition
I/O Connector
Recommended Accessories
NI 435x 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.
Several accessories are available to accurately measure
temperature, voltage, or resistance. Use this table to choose from
recommended accessories.
Software
Instrument Driver
Use the NI 435x instrument driver to integrate a device into your test
software. The instrument driver works with:
• NI LabVIEW
• NI Measurement Studio
• Visual C/C++
• Visual Basic
With computer-based NI 435x devices, you can create distributed
measurement systems with ease, taking full advantage of the Web.
Interactive Control for Temperature
and Voltage Measurement
In addition to the instrument driver, NI includes interactive datalogging software with NI 435x devices. You can use this multichannel
data-logging software for recording and displaying low-frequency
signals, such as temperature, pressure, resistance, and voltage. The
software controls NI 435x devices with no programming required.
You use the data-logging software as you would use a stand-alone
data logger, but you benefit from the processing, display, and storage
capabilities of your computer.
2
National Instruments • Tel: (800) 813 3693 • info@ni.com • ni.com
Measurement Type
Thermocouple only
Voltage, resistance,
chromatography only
Temperature, voltage,
resistance, chromatography
NI 435x Platforms
PCI, PXI, USB
PCI, PXI, USB
Accessory
TC-2190 and SH6868 cable
TBX-68 and SH6868 cable
PCI, PXI, USB
TBX-68T and SH6868 cable;
CB-68T with CA-1000 and
SH6868 cable
Table 2. NI 435x Accessory Selection Guide
Ordering Information
NI PCI-4351 ..................................................................777789-01
NI PXI-4351 ..................................................................777790-01
NI USB-43501................................................................777225-01
Includes instrument driver and data-logging software.
1Includes 1 m USB cable; no power supply required; requires Windows 2000/XP.
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. only) or go to ni.com/daq.
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
NI 4350/4351
(PCI, PXI, USB)
SH6868
NI 4350/4351
(PCI, PXI, USB)
SH6868
TBX-68T
or
CB-68T
TBX-68T
or
CB-68T
NB8
NB8
NB8
NB8
NB7
NI 4350/4351
(PCI, PXI, USB)
SH6868
TBX-68T
or
CB-68T
NB7
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
0.050series D-type connectors. The cable is used to connect
USB-4350 or 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
ER-8
+5 V (Required for NI 4350 for USB Only)
ER-8
+5 V (Required for NI 4350 for USB Only)
SSR-8 (Input or Output)
+5 V (Required for NI 4350 for USB Only)
SSR-8 (Output)
+5 V (Required for NI 4350 for USB Only)
SC-206x (Input or Output)
+5 V (Required for NI 4350 for USB Only)
SC-206x (Output)
+5 V (Required for NI 4350 for USB Only)
*There are eight DIO lines available. In case two digital signal conditioning accessories are used at the same time, a digital input signal
There are eight
digital I/O
you use two
at the
same time,
a digital
input
signal
conditioning
accessory
willlines
alsoavailable.
drive the Ifequivalent
linedigital
on thesignal
digitalconditioning
output signalaccessories
conditioning
accessory.
Do not
use two
digital
input
conditioning at
accessory
drives the equivalent line on the digital output signal conditioning accessory. Do not use two digital input
accessories
the samealso
time.
accessories at the same time.
TC-2190
TBX-68T
CB-68T and CA-1000
TBX-68
National Instruments • Tel: (800) 813 3693 • info@ni.com • ni.com
3
High-Precision Data Acquisition
Specifications
Accuracy Tables1,2
RTD Accuracy4,5,6,7
Thermocouple Accuracy3
TC Type
J
K
N
E
T
R
S
B
°C
-100
0
760
-100
0
1,000
1,372
-100
0
400
1,300
-100
0
500
1,000
-150
0
400
250
1,000
1,767
250
1,000
1,767
600
1,000
1,820
Error (°C)
10 Hz
50 Hz
0.53
0.61
0.42
0.49
0.42
0.47
0.60
0.72
0.45
0.54
0.60
0.69
0.74
0.84
0.68
0.84
0.54
0.67
0.42
0.51
0.57
0.66
0.55
0.62
0.41
0.46
0.35
0.40
0.46
0.50
0.81
0.96
0.46
0.55
0.33
0.39
0.82
1.16
0.72
0.99
0.91
1.19
0.91
1.28
0.77
1.05
0.96
1.27
1.08
1.64
0.76
1.14
0.74
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
Temperature
Coefficient
(°C/°C)
0.02
Accessory
Error2
(°C)
0.25
0.03
0.27
°C
-200
0
100
300
600
10 Hz
0.05
0.12
0.16
0.23
0.36
1.00
1.14
1.22
1.38
1.66
Error (°C) (100 Ω RTD)
50 Hz
0.06
1.33
0.13
1.49
0.17
1.58
0.24
1.76
0.37
2.08
60 Hz
0.07
0.14
0.18
0.26
0.39
1.81
2.00
2.10
2.32
2.69
Temperature
Coefficient (°C/°C)
0.02
*With 100 Ω RTD, 1 mA current source (NI 4351 only) **With 100 Ω RTD, 25 µA current source
Thermistor Accuracy8,9
0.03
0.26
0.02
0.28
0.03
0.36
0.06
0.12
0.07
0.13
0.11
0.00
°C
0-50
Error (°C)
0.03
Temperature
Coefficient (°C/°C)
0.001
Settling Time for Full-Scale Step
Accuracy (%)
±0.1
±0.01
±0.0015
±0.001
±0.0004
Time (s)
0.3
0.5
2.4
3
7
Resistance Accuracy10 (with 1 mA current source, NI 4351 only)
Range
(Ω)
15,000
7,500
3,750
2,500
1,250
625
24 Hour
0.0320
0.0326
0.0338
0.0240
0.0246
0.0258
% of Reading
90 Day
0.0349
0.0355
0.0367
0.0269
0.0275
0.0287
1 Year
0.0379
0.0385
0.0397
0.0299
0.0305
0.0317
Additional Error with Autozero (Ω)
10 Hz
50 Hz
60 Hz
1.53
1.62
1.64
1.52
1.57
1.61
1.51
1.53
1.54
0.03
0.04
0.05
0.03
0.04
0.04
0.02
0.02
0.02
Additional Error without Autozero (Ω)
10 Hz
50 Hz
60 Hz
1.63
1.69
1.71
1.63
1.66
1.69
1.62
1.63
1.64
0.05
0.06
0.06
0.05
0.05
0.06
0.04
0.04
0.04
Temperature Coefficient %
Reading/°C
0.0013
0.0013
0.0013
0.0013
0.0013
0.0013
Additional Error with Autozero (Ω)
10 Hz
50 Hz
60 Hz
20.11
23.64
24.63
19.82
21.80
23.22
19.54
20.16
20.67
0.51
1.00
1.28
0.45
0.80
1.02
0.41
0.54
0.74
Additional Error without Autozero (Ω)
10 Hz
50 Hz
60 Hz
24.17
26.67
27.37
23.97
25.37
26.37
23.77
24.21
24.57
1.26
1.60
1.80
1.21
1.46
1.62
1.18
1.28
1.42
Temperature Coefficient
% Reading/°C
0.0013
0.0013
0.0013
0.0013
0.0013
0.0013
Resistance Accuracy11 (with 25 µA current source)
Range
(kΩ)
600
300
150
100
50
25
24 Hour
0.0435
0.0441
0.0453
0.0355
0.0361
0.0373
% of Reading
90 Day
0.0464
0.0470
0.0482
0.0384
0.0390
0.0402
1 Year
0.0494
0.0500
0.0512
0.0414
0.0420
0.0432
1All
specifications are for the NI 435x instruments between 15 and 35 °C and for 1 year unless
otherwise noted. All specifications are relative to calibration standards and require a 30-minute
warm-up period. Specifications do not include transducer error.
2 Temperature coefficient is applicable for 0 to 15 °C and 35 to 55 °C. For thermocouples, add the
accessory error in °C only if the accessory (TC-2190, TBX-68T, CB-68T) is in the 0 to 15 °C and
35 to 55 °C temperature range.
3Thermocouple measurement specifications include cold-junction compensation error (with sensor
between 15 and 35 °C), isothermal accuracy, and system noise. The specifications assume that the
0.625 V range is used and that ground-referencing and open-thermocouple detection are enabled
for a floating thermocouple. Specifications improve with ground-referencing enabled and openthermocouple detection disabled for a floating thermocouple. The specifications also assume that
the cold-junction sensor is between 15 and 35 °C.
4With 100 Ω RTD, 1 mA current source (NI 4351 only)
5With 100 Ω RTD, 25 µA current source.
6RTD specifications assume that the 625 Ω range (with a 1 mA current excitation) is used, and the
worst-case common-mode voltage for this range is present. Specifications improve if the actual
common-mode voltage is less than the worst-case voltage.
4
National Instruments • Tel: (800) 813 3693 • info@ni.com • ni.com
7RTD
specifications assume that the 25 kΩ range (with a 25 µA current excitation) is used, and the
worst-case common-mode voltage for this range is present. Specifications improve if the actual
common-mode voltage is less than the worst-case voltage. Specifications improve for a 1,000 Ω RTD.
8With 5,000 Ω thermistor
9Thermistor accuracy is valid for all filter settings. Specifications assume that the 25 kΩ range is
used, and the worst-case common-mode voltage for this range is present. Specifications improve
if the actual common-mode voltage is less than the worst-case voltage.
10Resistance specifications assume the worst-case common-mode voltage for the given range.
Specifications improve if the actual common-mode voltage is less than the worst-case voltage.
Measurement accuracy is affected by source impedance.
11Resistance specifications assume the worst-case common-mode voltage for the given range.
Specifications improve if the actual common-mode voltage is less than the worst-case voltage.
Measurement accuracy is affected by source impedance. Resistances >25 kΩ may require
1 s settling time.
High-Precision Data Acquisition
DC Voltage Accuracy1
Range
(Ω) 24 Hour
15
7.5
3.75
2.5
1.25
0.625
1Voltage
90 Day
0.0146
0.0152
0.0164
0.0066
0.0072
0.0084
% of Reading
1 Year
0.0175
0.0181
0.0193
0.0095
0.0101
0.0113
10 Hz
0.0205
0.0211
0.0223
0.0125
0.0131
0.0143
Additional Error with Autozero (Ω)
50 Hz
60 Hz
10 Hz
28
117
141
21
71
106
14
30
42
5
17
24
3
12
18
2
6
11
Temperature Coefficient
µV/°C
0.0009
5
0.0009
5
0.0010
5
0.0004
1
0.0004
1
0.0005
1
specifications do not include errors resulting from common-mode voltages. Calculate additional error due to common-mode voltages as: common-mode voltage/10 (CMR specification in dB/20).
Digital I/O and Alarm Outputs
Analog Input
Input characteristics
Number of channels ..................................
Digits..........................................................
Type of ADC...............................................
ADC resolution ..........................................
Calibration cycle ........................................
Mode
Single channel
Multiple-channel2 scanning
1Resistance
2Total
Additional Error without Autozero (Ω)
50 Hz
60 Hz
% Reading/°C
130
193
210
125
160
185
120
131
140
24
32
37
22
29
33
22
24
28
16 differential or 14 temperature
51⁄2
Delta-sigma
24 bits, no missing codes
1 year
Reading Rate (Readings/s)
10
50
60
2.8 (1.41)
8.8 (2.11)
9.7 (2.11)
Power Line Noise Rejection
50, 60, 400 Hz
50, 400 Hz
60 Hz
50, 60, 400 Hz
50, 400 Hz
60 Hz
ranges >50 k
number of readings per second (for single-channel speed, divide by the number of channels acquired)
Reading Rates
Input coupling................................................... DC
Maximum working voltage (signal + common mode)
Range >2.5 V ............................................. Each input should remain within ±15 V of ground
Range ≤2.5 V............................................. Each input should remain within ±2.5 V of ground
Over voltage protection
(ACH<0..8/15>, IEX± <0..1>)...................... ±42 V powered on, ±17 V powered off
Data transfers .................................................. Interrupts, programmed I/O
Warm-up time .................................................. 30 minutes
Amplifier Characteristics
Input impedance
Normal powered on...................................
Powered off ...............................................
Overload.....................................................
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).............................
>1 GΩ in parallel with 0.39 µF
10 kΩ
10 kΩ
10 MΩ between CH+ and +2.5 V (software selectable)
10 MΩ between CH- and ground (software selectable)
<500 pA
80 dB
100 dB
>100 dB
Number of lines ............................................... 8
Compatibility .................................................... TTL
Level
Input low voltage
Input high voltage
Input low current (Vin = 0 V)
Input high current (Vin = 5 V)
Output low voltage (Iout = 8 mA)
Output high voltage (Iout = 8 mA)
Output low voltage1 (Iout = 64 mA)
Output high voltage1 (Iout = 15 mA)
1Buffered
Minimum
0.0 V
2.0 V
–
–
–
3.8 V
–
2.0 V
Maximum
0.8 V
5.0 V (Vcc)
-10.0 µA
10.0 µA
0.4 V
–
0.5 V
–
digital output on TBX-68T and CB-68T accessories
Digital Logic Levels
Power-on state ................................................. Tristate (weak pull-up)
Data transfers .................................................. Programmed I/O
Bus interface .................................................... PCI, PXI, USB
Power Requirements
+5 VDC
PCI-4351..................................................... 480 mA
PXI-4351..................................................... 480 mA
USB-5350................................................... 500 mA
Physical
Dimensions
PCI ............................................................... 11.2 by 18.8 cm (4.4 by 7.4 in.)
PXI ............................................................... 10.0 by 16.0 cm (3.9 by 6.3 in.), 3U
USB ............................................................. 14.6 by 21.3 by 3.8 cm
(5.8 by 8.4 by 1.5 in.)
I/O connector.................................................... 68-pin male, shielded and latched
Environment
Operating temperature..................................... 0 to 55 °C
Storage temperature ........................................ -20 to 70 °C
Relative humidity ............................................. 10 to 90%, noncondensing
Certifications and compliances
CE Mark Compliance
The product meets applicable EU directives for CE Mark compliance.
Dynamic Characteristics
Bandwidth ........................................................ 20 Hz
Excitation
Parameter
±Ex0
±Ex11
1NI
Level
25 µA
1 mA
Maximum Load Resistance
600 kΩ
15 kΩ
Temperature Coefficient
±15 ppm
±15 ppm
4351 only
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5
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