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National Instruments NI 4350 User Manual
Summary of NI 4350
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Ni 4350 user manual temperature and voltage measurement instruments ni 4350 user manual may 1998 edition part number 321566b-01 © copyright 1997, 1998 national instruments corporation. All rights reserved..
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Internet support e-mail: support@natinst.Com ftp site: ftp.Natinst.Com web address: www.Natinst.Com bulletin board support bbs united states: 512 794 5422 bbs united kingdom: 01635 551422 bbs france: 01 48 65 15 59 fax-on-demand support 512 418 1111 telephone support (usa) tel: 512 795 8248 fax: 512...
Page 3: Important Information
Important information warranty the ni 4350 instruments are warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National instruments will, at its option, repair or replace equipment that proves to ...
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© national instruments corporation v ni 4350 user manual contents about this manual organization of this manual ........................................................................................ Ix conventions used in this manual....................................................................
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Contents ni 4350 user manual vi © national instruments corporation using programmable ground-referencing .................................................................. 3-4 using programmable open-thermocouple detection ................................................. 3-5 measuring temperature w...
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Contents © national instruments corporation vii ni 4350 user manual appendix a specifications appendix b signal connections appendix c customer communication glossary index figures figure 1-1. The relationship between the programming environment, ni-daq and your hardware ...............................
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Contents ni 4350 user manual viii © national instruments corporation table 3-5. Guidelines for resistance measurement ............................................... 3-25 table 3-6. Logic family thresholds*..................................................................... 3-29 table b-1. Using th...
Page 8: Organization of This Manual
© national instruments corporation ix ni 4350 user manual about this manual this manual describes the electrical and mechanical aspects of the ni 4350 family of instruments and contains information concerning its operation and programming. Organization of this manual the ni 4350 user manual is organ...
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About this manual ni 4350 user manual x © national instruments corporation conventions used in this manual the following conventions are used in this manual: ♦ the ♦ symbol indicates that the text following it applies only to a specific ni 4350 instrument. This icon to the left of bold italicized te...
Page 10: Customer Communication
About this manual © national instruments corporation xi ni 4350 user manual national instruments documentation the ni 4350 user manual is one piece of the documentation set for your daq system. You could have any of several types of manuals depending on the hardware and software in your system. Use ...
Page 11: Introduction
© national instruments corporation 1-1 ni 4350 user manual chapter 1 introduction this chapter describes the ni 4350 family of temperature and voltage measurement instruments, lists what you need to get started, explains how to unpack your ni 4350 instrument, and describes the optional software and ...
Page 12: What You Need to Get Started
Chapter 1 introduction ni 4350 user manual 1-2 © national instruments corporation the ni 4350 instrument is plug and play compatible. The instrument is fully software-calibrated. Because the ni 4350 instrument works with a variety of operating systems, you can develop applications that scale across ...
Page 13: Unpacking
Chapter 1 introduction © national instruments corporation 1-3 ni 4350 user manual unpacking ♦ ni 4350 (pcmcia) your ni 4350 (pcmcia) is shipped in an antistatic vinyl case; when you are not using your ni 4350 (pcmcia), store it in this case. Because your ni 4350 (pcmcia) is enclosed in a fully shiel...
Page 14: Software Programming Choices
Chapter 1 introduction ni 4350 user manual 1-4 © national instruments corporation software programming choices there are several options to choose from to program and use your national instruments daq instruments. You can use labview, labwindows/cvi, virtualbench, or the ni435x instrument driver. Na...
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Chapter 1 introduction © national instruments corporation 1-5 ni 4350 user manual data storage by adding timestamps, measurements, user name, and comments. Your ni 4350 works with virtualbench-logger and virtualbench-dio. Virtualbench-logger is a turn-key application that allows you to make measurem...
Page 16: Optional Equipment
Chapter 1 introduction ni 4350 user manual 1-6 © national instruments corporation figure 1-1. The relationship between the programming environment, ni-daq and your hardware optional equipment national instruments offers a variety of products to use with your ni 4350, including cables, connector bloc...
Page 17: Installation and
© national instruments corporation 2-1 ni 4350 user manual chapter 2 installation and configuration this chapter describes how to install and configure your ni 4350 instrument. Software installation install your software before you install your ni 4350 instrument. Refer to the appropriate release no...
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Chapter 2 installation and configuration ni 4350 user manual 2-2 © national instruments corporation use the following general instructions to install your ni 4350 (pcmcia): 1. Write down your ni 4350 (pcmcia) serial number on the ni 435 0 hardware and software configuration form in appendix c. 2. Tu...
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Chapter 2 installation and configuration © national instruments corporation 2-3 ni 4350 user manual 6. Screw the mounting bracket of the ni 4350 (isa) to the back panel rail of the computer. 7. Replace the cover. 8. Plug in and turn on your computer. 9. Run the ni-daq configuration utility to make s...
Page 20: Configuration
Chapter 2 installation and configuration ni 4350 user manual 2-4 © national instruments corporation configuration your ni 4350 is a completely software-configurable, plug and play instrument. The plug and play services query the instrument and allocate the required resources. Then the operating syst...
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Chapter 2 installation and configuration © national instruments corporation 2-5 ni 4350 user manual power considerations for the ni 4350 (usb) the ni 4350 (usb) is designed to remain powered only when the usb cable connects it to the host pc and the pc is powered. The ni 4350 (usb) is designed to ru...
Page 22: Ni 4350 Operation
© national instruments corporation 3-1 ni 4350 user manual chapter 3 ni 4350 operation this chapter describes how to use your ni 4350 instrument and includes operation tips on taking measurements with temperature sensors such as thermocouples, rtds, and thermistors, as well as measuring voltages and...
Page 23: Choosing A Reading Rate
Chapter 3 ni 4350 operation ni 4350 user manual 3-2 © national instruments corporation the 4-wire ohms mode has six corresponding input ranges when used with the built-in 25 µΑ current source: 25 k Ω, 50 k Ω, 100 k Ω, 150 k Ω, 300 k Ω, and 600 k Ω. Choose the smallest range for the best measurement ...
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Chapter 3 ni 4350 operation © national instruments corporation 3-3 ni 4350 user manual in single-channel measurements, the reading rate is the same as the notch filter frequency — 10, 50, or 60 readings/s. In multiple-channel measurements, the reading rates adjust to allow the analog and digital fil...
Page 25: Knowing Your Signal Source
Chapter 3 ni 4350 operation ni 4350 user manual 3-4 © national instruments corporation knowing your signal source for accurate measurements, you must determine whether your signal source is floating or ground-referenced. Floating signal source a floating signal source is one that is not connected in...
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Chapter 3 ni 4350 operation © national instruments corporation 3-5 ni 4350 user manual note: the default setting for programmable ground referencing is on in volts measurement mode and off in 4-wire ohms mode. Using programmable open-thermocouple detection the ni 4350 instruments have software-progr...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-6 © national instruments corporation note: the default setting for programmable open-thermocouple detection in volts and 4-wire ohms measurement modes is off. Measuring temperature with thermocouples the thermocouple is the most popular transducer fo...
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Chapter 3 ni 4350 operation © national instruments corporation 3-7 ni 4350 user manual figure 3-2. Effect of the cold-junction with the ni 4350 instruments, you can perform cold-junction compensation in software. To do this, you can use the thermistor temperature sensor on the ni 4350 accessory to m...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-8 © national instruments corporation 3. Measure the voltage, v measured , and add the cold-junction voltage, v cold-junction , computed in step 2. 4. Convert the resulting voltage to temperature using a standard thermocouple conversion formula. Conne...
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Chapter 3 ni 4350 operation © national instruments corporation 3-9 ni 4350 user manual auto-zero auto-zero is a method that instruments use to remove any offset errors in the measurement. Analog channel 1 (ch1) on the psh32-tc6, cb-27t, tc-2190, and tbx-68t is dedicated for auto-zero. Ch1+ is connec...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-10 © national instruments corporation programmable open-thermocouple detection to detect open or broken thermocouples, switch on open-thermocouple detection on that channel. Then, if the thermocouple breaks, the voltage on that channel will rise rapi...
Page 32: Measuring Dc Voltage
Chapter 3 ni 4350 operation © national instruments corporation 3-11 ni 4350 user manual temperature) and at the cold-junction on the accessory will introduce error. To minimize thermal emfs, use wires of the same thermocouple type when extending the length of the thermocouple. Also, minimize tempera...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-12 © national instruments corporation optimizing measurements to make accurate voltage measurements, program the onboard ground-referencing and open-thermocouple detection appropriately. Also consider problems associated with ac noise effects, therma...
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Chapter 3 ni 4350 operation © national instruments corporation 3-13 ni 4350 user manual programmable open-thermocouple detection when you measure voltage signals other than thermocouples, always switch off the onboard, open-thermocouple detection. Source impedance for best results, maintain the sour...
Page 35: And Measuring Resistance
Chapter 3 ni 4350 operation ni 4350 user manual 3-14 © national instruments corporation measuring temperature with rtds and thermistors and measuring resistance rtds and thermistors are essentially resistors whose resistance varies with temperature. Therefore, measurement techniques for rtds, thermi...
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Chapter 3 ni 4350 operation © national instruments corporation 3-15 ni 4350 user manual coefficient, called alpha ( α ) differs between rtd curves. Although various manufacturers may specify α differently, α is most commonly defined as the change in rtd resistance from 0 ° to 100 ° c, divided by the...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-16 © national instruments corporation therefore, for temperatures above 0 ° c, this equation reduces to a quadratic: most platinum rtd curves follow one of three standardized curves: the din 43760 standard ( α = 0.00385), the u.S. Industrial or ameri...
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Chapter 3 ni 4350 operation © national instruments corporation 3-17 ni 4350 user manual figure 3-4. Two-wire rtd measurement for example, a lead resistance r l of 0.3 Ω in each wire adds a 0.6 Ω error to the resistance measurement. For a platinum rtd with α = 0.00385, the resistance equals a 0.6 Ω /...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-18 © national instruments corporation figure 3-6. Three-wire rtd measurement with a wheatstone bridge and a current source figure 3-7. Three-wire rtd measurement see figure 3-10 for an example of how you can use different transducers connected to ana...
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Chapter 3 ni 4350 operation © national instruments corporation 3-19 ni 4350 user manual commonly used than ptc thermistors, especially for temperature measurement applications. A main advantage of thermistors for temperature measurement is their extremely high sensitivity. For example, a 2252 Ω ther...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-20 © national instruments corporation the thermistor has been used primarily for high-resolution measurements over limited temperature ranges. Continuous improvements in thermistor stability, accuracy, and the availability of interchangeable thermist...
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Chapter 3 ni 4350 operation © national instruments corporation 3-21 ni 4350 user manual figure 3-9. Thermistor measurement see figure 3-10 for an example of how you can use different transducers connected to analog channels in the same measurement setup. Connecting your resistor you can use signal c...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-22 © national instruments corporation figure 3-10. Multiple transducer connections to analog channels in one measurement setup the ni 4350 instrument analog inputs are protected against damage from voltages within ±42 vdc in all ranges when powered u...
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Chapter 3 ni 4350 operation © national instruments corporation 3-23 ni 4350 user manual input ranges the ni 4350 has six ranges for resistance measurements. These ranges are 25 k Ω, 50 k Ω , 100 k Ω , 150 k Ω , 300 k Ω , and 600 k Ω .These ranges correspond to the six input ranges available for meas...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-24 © national instruments corporation especially useful when your ni 4350 instrument is operating at an ambient temperature other than that of calibration (23 ° c typical). Use the 4-wire mode in labview while reading the offset for resistance measur...
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Chapter 3 ni 4350 operation © national instruments corporation 3-25 ni 4350 user manual self-heating the current source on the ni 4350 instrument is designed such that any error resulting from self-heating is negligible in most cases. This section explains how that occurs. When current is passed thr...
Page 47: Using The Current Source
Chapter 3 ni 4350 operation ni 4350 user manual 3-26 © national instruments corporation higher in still air than in moving water. The self-heating in rtds due to the built-in 25 µ a is negligible. Ac noise effects the ni 4350 instruments reject ac noise as specified in nmr in appendix a, specificati...
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Chapter 3 ni 4350 operation © national instruments corporation 3-27 ni 4350 user manual using digital inputs and outputs the ni 4350 features ttl-compatible digital lines. These lines can be individually configured either as inputs or as outputs. At power-up, these digital lines are configured as hi...
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Chapter 3 ni 4350 operation ni 4350 user manual 3-28 © national instruments corporation figure 3-11. Examples of dio applications the dio lines of the ni 4350 instrument are protected against damage from voltages within – 0.5 and +5.5 v with respect to digital ground (dgnd). You should never apply v...
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Chapter 3 ni 4350 operation © national instruments corporation 3-29 ni 4350 user manual note: if the number of digital input lines is not adequate for your application, you can use the analog input channels to measure the voltage of the digital signal you want to measure. Then you can determine the ...
Page 51: Specifications
© national instruments corporation a-1 ni 4350 user manual appendix a specifications this appendix lists the specifications of the ni 4350. These specifications are for 15° to35° c ambient temperature range for one year unless otherwise specified. All specifications are relative to calibration stand...
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Appendix a specifications ni 4350 user manual a-2 © national instruments corporation n –100 0.68 0.84 1.08 0.03 0.26 0 0.54 0.67 0.86 400 0.42 0.51 0.65 1300 0.57 0.66 0.80 e –100 0.55 0.62 0.74 0.02 0.28 0 0.41 0.46 0.55 500 0.35 0.40 0.46 1000 0.46 0.50 0.57 t –150 0.81 0.96 1.17 0.03 0.36 0 0.46 ...
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Appendix a specifications © national instruments corporation a-3 ni 4350 user manual rtd accuracy 2 thermistor accuracy 3 2 rtd specifications assume that the 25 k Ω range is used and worst case common mode voltage for this range is present. Specifications improve if actual common mode voltage is le...
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Appendix a specifications ni 4350 user manual a-4 © national instruments corporation dc voltage accuracy 4 resistance accuracy 5 4 voltage specifications do not include errors resulting from common mode voltages. Calculate additional error because of common mode voltages as: common mode voltage/10 (...
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Appendix a specifications © national instruments corporation a-5 ni 4350 user manual accuracy calculation examples the following are accuracy calculation examples: • measurement of 760° c using j type thermocouple at 28° c ambient temperature; filter setting of 10 hz: accuracy is 0.42° c [directly f...
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Appendix a specifications ni 4350 user manual a-6 © national instruments corporation adc resolution .................................. 24 bits, no missing codes calibration cycle ................................ One year reading rates input coupling .................................... Dc maximum wo...
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Appendix a specifications © national instruments corporation a-7 ni 4350 user manual open-thermocouple detection .............10 m Ω between ch+ and +2.5 v (software selectable) ground-referencing.............................10 m Ω between ch– and ground (software selectable) input bias current .......
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Appendix a specifications ni 4350 user manual a-8 © national instruments corporation digital i/o and alarm outputs number of lines pcmcia ..................................... 4 isa and usb ............................... 8 compatibility ..................................... Ttl dio power-on state.....
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Appendix a specifications © national instruments corporation a-9 ni 4350 user manual physical dimensions pcmcia ......................................Type ii pc card isa...............................................Isa (half size) usb .............................................14.6 by 21.3 by 3.8...
Page 60: Signal Connections
© national instruments corporation b-1 ni 4350 user manual appendix b signal connections this section explains the signal correlation between your ni 4350 and the accessories you might use with it. ♦ the ni 4350 (pcmcia) kit includes a label that you should apply to your cb-27 accessory. This label ...
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Appendix b signal connections © national instruments corporation b-2 ni 4350 user manual ch6– 15 ch7+ 16 ch7– 17 agnd 1 iex+ 18 iex– 19 rsvd1 20 rsvd2 21 dio0 23 dio1 24 dio2 25 dio3 26 dgnd 27 gnd 22 table b-1. Using the ni 4350 (pcmcia) with the cb-27 (continued) ni 4350 (pcmcia) signal name cb-27...
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Appendix b signal connections © national instruments corporation b-3 ni 4350 user manual ♦ the ni 4350 (isa and usb) accessories—tbx-68, sh6868, and r6868— have a one-to-one correlation to pins on the ni 4350 (isa). Table b-2. Using the ni 4350 (isa and usb) with the tbx-68 ni 4350 (isa and usb) sig...
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Appendix b signal connections ni 4350 user manual b-4 © national instruments corporation ch9– 55 ch10+ 54 ch10– 21 ch11+ 19 ch11– 53 ch12+ 52 ch12– 18 ch13+ 17 ch13– 50 ch14+ 49 ch14– 15 ch15+ 13 ch15– 46 iex+ 12 iex– 45 dio0 7 dio1 6 dio2 5 dio3 4 dio4 37 dio5 3 table b-2. Using the ni 4350 (isa an...
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Appendix b signal connections © national instruments corporation b-5 ni 4350 user manual dio6 2 dio7 1 +5v 8* dgnd 35, 36, 38, 39, 40, 41, 42 agnd 9, 10, 11, 14, 16, 20, 24, 27, 32, 43, 44, 47, 48, 51, 56, 59, 64, 67 * the current available may be limited to less than 50 ma (typical) when using the ...
Page 65: Customer Communication
© national instruments corporation c-1 ni 4350 user manual appendix c customer communication for your convenience, this appendix contains forms to help you gather the information necessary to help us solve your technical problems and a form you can use to comment on the product documentation. When y...
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Fax-on-demand support fax-on-demand is a 24-hour information retrieval system containing a library of documents on a wide range of technical information. You can access fax-on-demand from a touch-tone telephone at 512 418 1111. E-mail support (currently usa only) you can submit technical support que...
Page 67: Technical Support Form
Technical support form photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contacting national instruments for technical support helps ...
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Ni 4350 hardware and software configuration form record the settings and revisions of your hardware and software on the line to the right of each item. Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current con...
Page 69: Documentation Comment Form
Documentation comment form national instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: ni 4350 user manual edition date: may 1998 part number: 321566b-01 please comment on the completene...
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© national instruments corporation g-1 ni 4350 user manual glossary numbers/symbols % percent + positive of, or plus – negative of, or minus ± plus or minus / per ° degree Ω ohm +5v +5 v output signal prefix meanings value n- nano- 10 –9 µ- micro- 10 – 6 m- milli- 10 –3 k- kilo- 10 3 m- mega- 10 6 g...
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Glossary ni 4350 user manual g-2 © national instruments corporation a a ampere—unit of current ac alternating current ac coupled allowing the transmission of ac signals while blocking dc signals adc analog-to-digital converter—an electronic device, often an integrated circuit, that converts an analo...
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Glossary © national instruments corporation g-3 ni 4350 user manual c c celsius channel pin or wire to which you apply or from which you read the analog or digital signal. For digital signals, you group channels to form ports. Ports usually consist or either four or eight digital channels. Chx chann...
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Glossary ni 4350 user manual g-4 © national instruments corporation drivers software that controls a specific hardware instrument dynamic range the ratio of the largest signal level a circuit can handle to the smallest signal level it can handle (usually taken to be the noise level), normally expres...
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Glossary © national instruments corporation g-5 ni 4350 user manual in. Inches interrupt a computer signal indicating that the cpu should suspend its current task to service a designated activity i/o input/output—the transfer of data to/from a computer system involving communications channels, opera...
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Glossary ni 4350 user manual g-6 © national instruments corporation n ni-daq national instruments driver software for daq hardware, including computer-based instruments nist national institute of standards and technology nmr normal mode rejection noise an undesirable signal—electrical noise comes fr...
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Glossary © national instruments corporation g-7 ni 4350 user manual plug and play isa a specification prepared by microsoft, intel, and other pc-related companies that will result in pcs with plug-in boards that can be fully configured in software, without jumpers or switches on the boards port (1) ...
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Glossary ni 4350 user manual g-8 © national instruments corporation t ttl transistor-transistor logic thermocouple kind of temperature sensor thermistor kind of temperature sensor u update one or more analog or digital output samples. Typically the number of output samples in an update is equal to t...
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© national instruments corporation i-1 ni 4350 user manual index numbers 4-wire ohms measurement mode purpose and use, 3-1 range selection, 3-2 a ac noise effects, minimizing dc voltage measurement, 3-13 rtds, thermistors, and resistors, 3-26 thermocouples, 3-10 accuracy specifications, a-1 to a-5 c...
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Index ni 4350 user manual i-2 © national instruments corporation inadequate number of input lines (note), 3-29 logic family thresholds (table), 3-29 preventing safety hazards (caution), 3-28 digital i/o and alarm output specifications, a-8 documentation conventions used in manual, x national instrum...
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Index © national instruments corporation i-3 ni 4350 user manual overview, 1-1 to 1-2 power considerations for ni 4350 (usb), 2-5 requirements for getting started, 1-2 software programming choices, 1-4 to 1-6 national instruments application software, 1-4 ni435x instrument driver and ni-daq, 1-5 to ...
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Index ni 4350 user manual i-4 © national instruments corporation programmable open-thermocouple detection, 3-13 source impedance, 3-13 thermal emf, 3-13 rtds, thermistors, and resistors, 3-23 to 3-26 ac noise effects, 3-26 auto-zero method, 3-23 to 3-24 connecting to external circuits, 3-24 guidelin...
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Index © national instruments corporation i-5 ni 4350 user manual rtds, 3-14 to 3-18 accuracy specifications (table), a-3 callendar-van dusen coefficients (table), 3-16 connecting, 3-16 to 3-18 four-wire rtd measurement (figure), 3-17 three-wire rtd measurement (figure), 3-18 two-wire rtd measurement...
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Index ni 4350 user manual i-6 © national instruments corporation connecting thermocouple, 3-8 input ranges, 3-8 optimizing measurements, 3-8 to 3-11 thermal emf, minimizing dc voltage measurement, 3-13 rtds, thermistors, and resistors, 3-26 thermocouples, 3-10 to 3-11 thermistors, 3-18 to 3-21 accur...