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U2802A_UG.book Page II Monday, January 19, 2015 10:28 PM Notices © Keysight Technologies 2008–2015 Warranty No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies as governed by United States and international copyright laws.
U2802A_UG.book Page III Monday, January 19, 2015 10:28 PM Safety Information The following general safety precautions must be observed during all phases of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.
U2802A_UG.book Page IV Monday, January 19, 2015 10:28 PM Off (Supply) Equipment protected throughout by double insulation or reinforced insulation Caution, risk of electric shock Caution, hot surface Caution, risk of danger (See note.
U2802A_UG.book Page V Monday, January 19, 2015 10:28 PM Regulatory Markings The CE mark is a registered trademark of the European community. This CE mark shows that the product complies with all the relevant European legal directive. ICES/NMB-001 indicates that this ISM device complies with Canadian ICES-001. The CSA mark is a registered trademark of the Canadian Standards Association. A CSA mark with the indicators "C" and "US" means that the product is certified for both the U.S.
U2802A_UG.book Page VI Monday, January 19, 2015 10:28 PM General Safety Information WA R NI N G C AUTI O N VI • Do not use the device if it is damaged. Before you use the device, inspect the case. Look for cracks or missing plastic. Do not operate the device around explosive gas, vapor or dust. • Do not apply more than the rated voltage (as marked on the device) between terminals, or between terminal and external ground. • Always use the device with the cables provided.
U2802A_UG.book Page VII Monday, January 19, 2015 10:28 PM Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical/electronic product in domestic household waste. Product Category: With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product.
U2802A_UG.book Page VIII Monday, January 19, 2015 10:28 PM Environmental Conditions The table below shows the general environmental requirements for the product.
U2802A_UG.book Page IX Monday, January 19, 2015 10:28 PM In This Guide... 1 Getting Started This chapter introduces the new Keysight U2802A 31- channel thermocouple input device and provides quick start information. It also provides product outlook, installation configuration and troubleshooting guide. 2 Features and Functions This chapter contains details of the product features, applications, system overview and theory of operation.
U2802A_UG.book Page X Monday, January 19, 2015 10:28 PM Declaration of Conformity (DoC) The Declaration of Conformity (DoC) for this instrument is available on the Web site. You can search the DoC by its product model or description. http://www.keysight.
U2802A_UG.book Page 1 Monday, January 19, 2015 10:28 PM Contents Notices II Safety Information III Environmental Conditions VIII In This Guide...
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U2802A_UG.book Page 4 Monday, January 19, 2015 10:28 PM List of Tables Table 4-1 U2802A measurement accuracy with U2355A or U2356A, at 23 °C ± 5 °C, with different number of averaging points. 43 Table 4-2 U2802A measurement accuracy with U2355A, at 0 to 18 °C and 28 to 45 °C, with different number of averaging points. 44 Table 4-3 U2802A measurement accuracy with U2356A, at 0 to 18 °C and 28 to 45 °C, with different number of averaging points.
U2802A_UG.book Page 5 Monday, January 19, 2015 10:28 PM Keysight U2802A 31-Channel Thermocouple Input User’s Guide 1 Getting Started Introduction to Keysight U2802A 31-Channel Thermocouple Input 6 Product Overview 7 Product Outlook 7 Product Dimensions 9 Standard Purchase Items Checklist 10 Installations and Configurations 11 IVI-COM Drivers 12 This chapter introduces the new Keysight U2802A 31- channel thermocouple input device and provides quick start information.
U2802A_UG.book Page 6 Monday, January 19, 2015 10:28 PM 1 Getting Started Introduction to Keysight U2802A 31-Channel Thermocouple Input The Keysight U2802A 31- channel thermocouple input is a thermocouple input device that functions to convert low input voltage signal (< ±100 mV) from a thermocouple into an output voltage range suitable for data acquisition (DAQ) device (± 10 V).
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U2802A_UG.book Page 10 Monday, January 19, 2015 10:28 PM 1 Getting Started Standard Purchase Items Checklist Inspect and verify that you have all the following items upon standard purchase of U2802A 31- channel thermocouple input device. If there are missing items, contact the nearest Keysight Sales Office.
U2802A_UG.book Page 11 Monday, January 19, 2015 10:28 PM Getting Started 1 Installations and Configurations The U2802A is used in conjunction with the U2355A or U2356A DAQ. If you are using the U2300A Series with the Keysight Measurement Manager, follow the step- by- step instructions as stated in the Keysight USB Modular Products and Systems Quick Start Guide. N O TE You need to install IVI-COM driver before using the U2300A Series with Keysight VEE, LabVIEW or Microsoft Visual Studio.
U2802A_UG.book Page 12 Monday, January 19, 2015 10:28 PM 1 Getting Started IVI-COM Drivers The Keysight IVI- COM drivers simplify instrument control when you are working in a COM- compatible environment. IVI- COM allows you to programmatically control your instrumentation and make measurements while providing a greater degree of instrument interchangeability and code reuse.
U2802A_UG.book Page 13 Monday, January 19, 2015 10:28 PM Getting Started 1 application will compile, link, and execute without error. The test results, however, may be quite different because different instruments measure and generate signals differently. For more information on class- compliant interfaces and capability groups, visit www.ivifoundation.org.
U2802A_UG.book Page 14 Monday, January 19, 2015 10:28 PM 1 Getting Started Programming Environments An IVI- COM driver works well in a variety of application development environments (ADEs) below: ✔ Keysight VEE ✔ Microsoft® Visual Basic® 6 ✔ Visual Studio C++ ✔ Visual Basic 7 ✔ C# ✔ National Instruments LabVIEW IVI-COM Driver Installation 1 Verify that your PC meets the minimum system requirements. 2 Close all other applications on your PC.
U2802A_UG.book Page 15 Monday, January 19, 2015 10:28 PM Getting Started 1 7 Click IVI-COM to open the IVI- COM Driver Installation Menu. 8 Check on the U2300A Series and click Install and wait for the Installation Dialog to appear. 9 When the Installation Dialog appears, click Next to begin the IVI Driver installation. 10 Read the License Agreement(s). To accept the terms, click on the radio button labeled I accept the terms in the License Agreement then click Next to continue.
U2802A_UG.book Page 16 Monday, January 19, 2015 10:28 PM 1 Getting Started 12 If you choose a Custom setup, the Select Features dialog box will appear. a Click on any feature in the list to see the feature’s description and space requirement. It is recommended that you install the sample programs if you plan to program with the IVI driver. However, you may omit this recommendation to save space. b Select the check box for each feature to be installed. Clear the check box to omit the feature selection.
U2802A_UG.book Page 17 Monday, January 19, 2015 10:28 PM Keysight U2802A 31-Channel Thermocouple Input User’s Guide 2 Features and Functions Features 18 Applications 19 System Overview 20 Theory of Operation 21 Functionality of the System 21 Functional Block Diagram 22 This chapter contains details of the product features, applications, system overview and theory of operation.
U2802A_UG.book Page 18 Monday, January 19, 2015 10:28 PM 2 Features and Functions Features The U2802A Thermocouple Input conditioning device is complete with the following features: ✔ Up to 31 differential input mode, or 31- single ended inputs in voltage input mode. Each of the 31 channels can be configured as either thermocouple or voltage input mode independently. ✔ ×97.673 gain setting for thermocouple input mode. ✔ Built- in thermistor for cold junction compensation (CJC).
U2802A_UG.book Page 19 Monday, January 19, 2015 10:28 PM Features and Functions 2 Applications The U2802A Thermocouple Input conditioning device is designed for robust and demanding industrial applications.
U2802A_UG.book Page 20 Monday, January 19, 2015 10:28 PM 2 Features and Functions System Overview Figure 2-1 System overview of U2802A with DAQ The U2802A is essentially an amplifier module with a built- in temperature sensor (thermistor). In thermocouple mode, the U2802A input channel is used to amplify a differential voltage signal from a thermocouple (or any low voltage signal source in the range of ±100 mV) by 100 times.
U2802A_UG.book Page 21 Monday, January 19, 2015 10:28 PM Features and Functions 2 Theory of Operation Functionality of the System Figure 2-2 System functionality block diagram for U2802A 13 Thermocouple voltage signals are detected at the U2802A thermocouple inputs. 14 Signal is amplified with a gain of 97.673 by the U2802A. 15 The U2355A or U2356A DAQ converts the analog voltage signals to digital voltage readings.
U2802A_UG.book Page 22 Monday, January 19, 2015 10:28 PM 2 Features and Functions Functional Block Diagram The block diagram below in Figure 2- 3 illustrates the key functional components of the U2802A.
U2802A_UG.book Page 23 Monday, January 19, 2015 10:28 PM Features and Functions 2 The major functional blocks of the U2802A module are: • Analog input channel circuitry • Cold junction sensor • Digital control logic • EEPROM Analog input channel circuitry The analog circuitry for each channel consists of an instrumentation amplifier with a fixed gain of 97.673, a 4 Hz RC low- pass filter, and an output buffer.
U2802A_UG.book Page 24 Monday, January 19, 2015 10:28 PM 2 Features and Functions Bypass mode: In bypass mode, the TCn+ input is routed directly to the corresponding AI channel on Rear Connector 1. The single- ended signals tied to TCn+ should be referenced to a GND pin, and not to the TCn– input, as it is not directly connected to GND. The signal connection will depend on the type of source used.
U2802A_UG.book Page 25 Monday, January 19, 2015 10:28 PM Features and Functions 2 Figure 2-6 Ground-referenced and differential signal sources configuration in U2802A Zero mode: In zero mode, the positive and negative inputs of the instrumentation amplifier are shorted together. The output of the instrumentation amplifier is driven out to the corresponding AI channel. The voltage measured in this mode corresponds to the offset voltage of the channel.
U2802A_UG.book Page 26 Monday, January 19, 2015 10:28 PM 2 Features and Functions For bypass mode channels that are connected to valid voltage sources, the 10 MΩ pull- up resistor will cause additional current to flow through the voltage source. However, this additional current measurement is small and negligible for low impedance voltage sources. For thermocouple mode channels connected to valid thermocouples, the presence of the pull- up resistor introduces approximately 0.
U2802A_UG.book Page 27 Monday, January 19, 2015 10:28 PM Features and Functions 2 Open Thermocouple Detection The U2802A provides a built- in 10 MΩ resistor on each TC+ terminal, which is pulled up to the internal +15 V power supply rail. This resistor can be enabled or disabled via the digital I/O pins on Rear Connector 2.
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U2802A_UG.book Page 29 Monday, January 19, 2015 10:28 PM Keysight U2802A 31-Channel Thermocouple Input User’s Guide 3 Pin Configurations and Assignments Pin Configurations 30 Pin Assignments 30 Pin Description 31 Connector Pinout 36 This chapter described the Keysight U2802A 31- channel thermocouple input device pin configurations and connector pinout for user’s reference.
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U2802A_UG.book Page 31 Monday, January 19, 2015 10:28 PM Pin Configurations and Assignments 3 Pin Description Connector J71 Pin Pin name Description 1 TC1+ 2 TC1– In thermocouple mode, TCx+ and TCx– are the thermocouple differential input. In voltage mode, single ended input at TCx+ and GND. TCx– is not connected.
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U2802A_UG.book Page 39 Monday, January 19, 2015 10:28 PM Keysight U2802A 31-Channel Thermocouple Input User’s Guide 4 Product Specifications General Specifications 40 Product Characteristics 41 System Accuracy Specifications 43 Calculating System Accuracy 46 System Typical Performance 49 Making Accurate Temperature Measurements 51 This chapter specifies the environmental conditions, characteristics, and specifications of the Keysight U2802A 31- channel thermocouple input device.
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U2802A_UG.book Page 42 Monday, January 19, 2015 10:28 PM 4 Product Specifications Overvoltage protection* TC Mode† • Common mode: ±17 V (TC+ and TC– with respect to GND) • Differential mode: ±7 V (Differential voltage between TC+ and TC–) Bypass mode • ±20 V (TC+ input with respect to GND) Power Off Mode • ±11 V (TC+, TC– input with respect to GND) Input impedance > 1 GΩ Input bias current ±2.5 nA max Input offset current ±1.
U2802A_UG.book Page 43 Monday, January 19, 2015 10:28 PM Product Specifications 4 System Accuracy Specifications The Keysight U2802A thermocouple input measurement accuracy with the U2355A and U2356A is as shown in Table 4- 1, Table 4- 2, and Table 4- 3. N O TE • Assume a ±1 °C error in the CJ measurement due to sensor error and temperature gradient error in the accuracy numbers in Table 4-1, Table 4-2, and Table 4-3 below.
U2802A_UG.book Page 44 Monday, January 19, 2015 10:28 PM 4 Product Specifications Thermocouple Measurements Accuracy (U2355A @ 0 °C to 18 °C and 28 °C to 45 °C) T/C Type B E J K N R S T ITS-90 Temperature Range (°C) Optimum Measurement Range(°C) Without averaging 50 points averaging 500 points averaging (± °C) (± °C) (± °C) Low High Low High 0 1820 1100 1820 3.4 2.4 2.2 400 1100 7.5 3.6 2.2 –150 1000 2.7 2.6 2.5 –200 –150 3.8 3.6 3.6 –150 1200 2.5 2.4 2.
U2802A_UG.book Page 45 Monday, January 19, 2015 10:28 PM Product Specifications 4 Thermocouple Measurements Accuracy (U2356A @ 0 °C to 18 °C and 28 °C to 45 °C) T/C Type B E J K N R S T ITS-90 Temperature Range (°C) Optimum Measurement Range(°C) 50 points averaging 500 points averaging (± °C) (± °C) (± °C) Low High Low 0 1820 1100 1820 6.1 3.1 2.4 400 1100 14.4 6.3 2.7 –150 1000 3.0 2.6 2.6 –200 –150 4.2 3.7 3.6 –150 1200 2.9 2.5 2.5 –210 –150 4.9 4.1 4.
U2802A_UG.book Page 46 Monday, January 19, 2015 10:28 PM 4 Product Specifications Calculating System Accuracy The overall measurement system comprises of three major components: 1 DAQ (U2355A or U2356A) 2 Signal Conditioner (U2802A), which includes CJ Sensor error 3 Sensor (Thermocouples) Errors introduced by each of the above components has to be accounted for when calculating the total system accuracy.
U2802A_UG.book Page 47 Monday, January 19, 2015 10:28 PM Product Specifications 4 With zeroing, the offset errors from the DAQ and the U2802A can be removed, and replaced with the zeroing error. Based on the ITS- 90 Thermocouple table, a J- type thermocouple will output 33.102 mV at 600 °C, and changes at a rate of approximately 59 µV/°C. This corresponds to (33.102 mV × 97.673) or 3.2332 V at the input of the DAQ. Hence, EDAQ, ESIG_COND, and EZEROING are calculated as follows: • EDAQ = 0.02% × 33.
U2802A_UG.book Page 48 Monday, January 19, 2015 10:28 PM 4 Product Specifications Therefore, ETHERMOCOUPLE = 0.75% × 600 °C = 4.5 °C Using the above individual component errors, the total measurement system accuracy is calculated as below. System accuracy without thermocouple sensor error: ETOTAL = SQRT(EDAQ2 + ESIG_COND2 + EZEROING2 + ECJC2) = 0.95 °C System accuracy with thermocouple sensor error: ETOTAL = SQRT(EDAQ2 + ESIG_COND2 + EZEROING2 + ECJC2 + ETHERMOCOUPLE2) = 4.
U2802A_UG.book Page 49 Monday, January 19, 2015 10:28 PM Product Specifications 4 System Typical Performance Thermoelectric Characteristics The thermoelectric characteristics for various thermocouple types is shown in Figure 4- 10.
U2802A_UG.book Page 50 Monday, January 19, 2015 10:28 PM 4 Product Specifications Typical Error vs. Measurement Performance The U2802A measurement error with U2355A or U2356A at 23 °C ± 5 °C is shown in Figure 4- 11. Figure 4-11 U2802A measurement accuracy plot for various thermocouples type NOTE 50 Assume a ±1 °C error in the CJ measurement due to sensor error and temperature gradient error in the accuracy numbers in Figure 4-2.
U2802A_UG.book Page 51 Monday, January 19, 2015 10:28 PM Product Specifications 4 Making Accurate Temperature Measurements Thermocouple measurement accuracy is very sensitive to cold junction sensor errors and temperature gradients across the terminals. Keep the module away from any heat sources and drafts to minimize any variation between channels. The channels located closest to the center near the reference thermistor will have the best accuracy.
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U2802A_UG.book Page 53 Monday, January 19, 2015 10:28 PM Keysight U2802A 31-Channel Thermocouple Input User’s Guide 5 Calibration Calibration 54 Calibration Information 54 Zeroing Function 54 Restore Factory Calibration 55 This chapter contains the calibration information and factory restore calibration procedure for the Keysight U2802A 31- channel thermocouple input device.
U2802A_UG.book Page 54 Monday, January 19, 2015 10:28 PM 5 Calibration Calibration Calibration Information The Keysight U2802A is factory calibrated and the calibration constants are stored in the EEPROM. During initial setup, the calibration constants are read from the EEPROM before any measurements are taken. Zeroing Function The Keysight U2802A thermocouple input device operating in thermocouple mode can be set to zero mode, where the differential inputs of each channel are shorted together.
U2802A_UG.book Page 55 Monday, January 19, 2015 10:28 PM Calibration 5 Restore Factory Calibration The Restore Factory Calibration function in the Keysight U2802A is used to restore calibration data from user’s settings to factory original settings. To perform factory restore calibration, follow the step- by- step instructions shown below: 1 Click Restore Factory Calibration in the thermocouple form. 2 A dialog box will appear as shown below. 3 Click OK to start the factory restore calibration process.
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U2802A_UG.book Page 57 Monday, January 19, 2015 10:28 PM www.keysight.
U2802A_UG.book Page 1 Monday, January 19, 2015 10:28 PM This information is subject to change without notice. © Keysight Technologies 2008–2015 Edition 4, January 2015 *U2802-90003* U2802-90003 www.keysight.
