NIPCI-4351 NI [National Instruments Corporation], NIPCI-4351 Datasheet

NIPCI-4351

Manufacturer Part Number

NIPCI-4351

Description

High-Precision Data Acquisition

Manufacturer

NI [National Instruments Corporation]

Datasheet

1.NIPCI-4351.pdf (6 pages)

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High-Precision Data Acquisition

NI PCI-4351, NI PXI-4351

◾ ◾

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.

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

Family

NI 4351

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

PCI, PXI

Bus

(Thermocouple)

Channels

Voltage/

16/(14)

Accuracy

RTD

0.12

(°C)

Operating Systems

◾ ◾

Recommended Software

◾ ◾

Driver Software (included)

◾ ◾

Windows XP/2000/NT

LabVIEW Real-Time

LabVIEW

LabWindows

Measurement Studio

NI-435x instrument driver

Traditional NI-DAQ (Legacy)

Thermistor

Accuracy

0.03

(°C)

™

/CVI

Measurement

Resistance

Excellent

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. 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.

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.

Related parts for NIPCI-4351

NIPCI-4351 Summary of contents

Page 1

High-Precision Data Acquisition NI PCI-4351, NI PXI-4351 ◾ ◾ Temperature and voltage loggers Operating Systems ◾ ◾ ◾ ◾ Accuracy – 0.42 °C for J-type ◾ ◾ thermocouples, 0.03 °C for thermistors, 0.12 °C for RTDs Recommended Software ◾ ◾ ...

Page 2

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). ...

Page 3

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 ...

Page 4

High-Precision Data Acquisition Specifications » For complete specifications, see the NI 435x User Manual ni.com/manuals at . Thermocouple Accuracy Error (°C) TC Type ° -100 0.53 0.61 0.74 0 0.42 0.49 0.59 760 ...

Page 5

High-Precision Data Acquisition Open-thermocouple detection .............. 10 MΩ between CH+ and +2.5 V (software selectable) Ground-referencing ............................... 10 MΩ between CH- and ground (software selectable) Input bias current .................................. <500 pA CMR (DC, 50 Hz, 60 Hz, 400 Hz) Range ...

Page 6

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 SERVICE NEEDS ongoing maintenance. We offer services and service ...

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