Manuale d’uso / di manutenzione del prodotto NI 4050 del fabbricante National Instruments
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Computer-Based Instruments NI 4050 User Manual Digital Multimeter Card for PCMCIA NI 4050 User Manual Mar ch 2000 Edition Part Number 3214 27C-01.
Worldwide Technical Support and Product Info rmation www.ni.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 794 0100 Worldwide Office.
Important Information Warranty The NI 405 0 is warrant ed against defects in materials and workmanshi p for a peri od of one year from th e date of s hipment, as evidenced by receipts or other documentation. Nat ional Instruments will, at its option, repair or replace equipment that proves to be defective durin g the warranty period .
Compliance FCC/Canada Radio Frequency Interference Compliance* Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless communications from interference.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV te chnician for help. Canadian Department of Communications This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Conventions The follo wing con ventions are used in this manual: » The » symbol leads you throu gh nested menu items and dialog box options to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box.
© National Instruments Corporation vii NI 4050 User Manual Contents Chapter 1 Taking Measurements with the NI 4050 Cable and Probes .................. .............. ........... .............. ............ ........... .............. ........... .. 1-1 Introduction to the VirtualBench-DMM Soft Front Panel.
Contents NI 4050 User Manual viii www.ni.com Appendix A Specifications Appendix B Technical Support Resources Glossary Index Figures Figure 1-1. Installing the NI 4050 and Cables ................. .............. .............. ............ 1-2 Figure 1-2.
© National Instruments Corporation 1-1 NI 4050 User Manual 1 T aking Measurements with the NI 4050 Thank you for buying a N ational Instruments 4050 digital multimeter card.
Chapter 1 T aking Measure ments with the NI 4050 NI 4050 User Manual 1-2 www .ni.com Figure 1-1. Installing the NI 4050 and Cables The test probes connect to the NI 4050 accessory cable via shrouded banana jacks. The shrouds around the banan a jacks prevent you from contacting potentially hazardous v o ltages connected to the test probes.
Chapter 1 T aking Measurements with the NI 4050 © National Instruments Corporation 1-3 NI 4050 User Manual Introduction to the VirtualBench-DMM Soft Front Panel The following sections explain how to make connections to your NI 4050 and take simple measurements using the VirtualBench-DMM, as shown in Figure 1 -2 .
Chapter 1 T aking Measure ments with the NI 4050 NI 4050 User Manual 1-4 www .ni.com The Function selector allo ws you select a measurement mode. Select Edit»Settings and click on the tabs for Current and Resistance or Temperature to control the d ata type acquired by V irtualBen ch-DMM.
Chapter 1 T aking Measurements with the NI 4050 © National Instruments Corporation 1-5 NI 4050 User Manual % selects the percentage calculation. V irtualBench-DMM expresses the displayed reading as a percent de viation from the reference value entered in the Math Settings.
Chapter 1 T aking Measure ments with the NI 4050 NI 4050 User Manual 1-6 www .ni.com The NI 4050 is protected against damage from voltages within ±250 VDC or 250 V rms in all rang es. Y ou should nev er apply v oltages abov e these levels to the inputs.
Chapter 1 T aking Measurements with the NI 4050 © National Instruments Corporation 1-7 NI 4050 User Manual Figure 1-5. Connections for Resistanc e Measurement 2. Select 2-wire resistance mode. 3. Select the range for your measurement—200 Ω , 2 k Ω , 20 k Ω , 200 k Ω , 2 M Ω , 200 M Ω , or autorange.
Chapter 1 T aking Measure ments with the NI 4050 NI 4050 User Manual 1-8 www .ni.com 2. Select diode mode. 3. Select the range for your measurement. Only the 2 V range is av ailable for diode measurement. The v alue indicator will indicate the voltage drop measured.
Chapter 1 T aking Measurements with the NI 4050 © National Instruments Corporation 1-9 NI 4050 User Manual Measure T emperature You can measure temperature using common temperature transducers such as resistive temperature devices (RTD) and thermistors.
© National Instruments Corporation 2-1 NI 4050 User Manual 2 NI 4050 Operation This chapter contains safety instructions, measurement fundamentals and concerns, and scanning information.
Chapter 2 NI 4050 Operation NI 4050 User Manual 2-2 www .ni.com Measurement Fundamentals Wa r m U p The required warm-up time for the NI 4050 is 30 minutes. This warm-up time is important because measurements made with the NI 4050 multimeter can change with temperature.
Chapter 2 NI 4050 Operation © National Instruments Corporation 2-3 NI 4050 User Manual Input Ranges The NI 40 50 has five input ranges available for measuring DC voltages. These ranges are ±20 mV, ±200 mV, ±2.0 V, ±25V, and ±250 V. Each range has a 10% overrange, except for the 250 V range.
Chapter 2 NI 4050 Operation NI 4050 User Manual 2-4 www .ni.com Thermal EMF Thermal EMFs, or thermoelectric potentials, are voltages generated at the junctions of dissimilar metals and are functions of t emperature. Thermal EMFs in a circuit under test can cause higher than expected offsets that change with temperature.
Chapter 2 NI 4050 Operation © National Instruments Corporation 2-5 NI 4050 User Manual Figure 2-2. Normal Mode Measurement Effects If you are measuring signals in the presence of large normal mode voltages, consult Appendix A, Specificatio ns , to calculate the additional error to your system.
Chapter 2 NI 4050 Operation NI 4050 User Manual 2-6 www .ni.com Figure 2-3. Common Mode Measurement Effects Using the equation in Figure 2-3, you can calculate the voltage error due to the common mode v oltage.
Chapter 2 NI 4050 Operation © National Instruments Corporation 2-7 NI 4050 User Manual components and then measures the RMS v alue of the A C component. This method lets you measure a small A C signal in the presence of a lar ge DC of fset. Input Ranges The NI 40 50 has five input ranges available for measuring AC voltages.
Chapter 2 NI 4050 Operation NI 4050 User Manual 2-8 www .ni.com These additional errors are sho wn in Appendix A, Specifications . Wh ile the NI 4 050 is characterized and specified ov er the 20 Hz to 25 kHz frequency range, measurements outside of this range can still be made with decre ased accuracy .
Chapter 2 NI 4050 Operation © National Instruments Corporation 2-9 NI 4050 User Manual In the extended ohms range, the NI 4050 adds a 1 M Ω resistor in parallel with the test resistor , and then calculates the v alue of the resistor being tested. The test current for the 200 Ω , 2.
© National Instruments Corporation A-1 NI 4050 User Manual A Specifications This appendix lists the specif ications of the NI 4050. These specif ications are guaranteed between 15 and 35 ° C unless otherwise specifi ed. DC V oltage Accuracy (% of reading ± µV) Noise Rejection NMRR (10 Hz reading rate, 50/60 Hz powerline frequency ±1%) .
Appendix A Specifications NI 4050 User Manual A-2 www .ni. com DC Current Accuracy (% of reading ± µA ) DC current measurements require the use of the CSM current shunt modules. Input Characteristics 200 mA shunt Input protection ...................
Appendix A Specifications © National Instruments Corporation A-3 NI 4050 User Manual AC V oltage Accuracy (% of reading ± mV) Noise Rejection AC CMRR (DC to 60 Hz).................. .... > 80 dB (with a 1 k Ω imbalance in LO lead) Input Characteristics Input resistance .
Appendix A Specifications NI 4050 User Manual A-4 www .ni. com AC Current Accuracy (% of reading ± mA) A C current measurements require the use of the CSM current shunt module. Input Characteristics 200 mA shunt Input protection .....................
Appendix A Specifications © National Instruments Corporation A-5 NI 4050 User Manual Resistance Accuracy (% of reading ± Ω) Measurement mode ......
Appendix A Specifications NI 4050 User Manual A-6 www .ni. com General Specifications Settling time . .............. .............. ...............Affected by source impedance and input signal changes Warm-up time ............... ........... .........
© National Instruments Corporation B-1 NI 4050 User Manual B T echnical Support Resources This appendix describes the comprehensiv e resources av ailable to you in the T echnical Support section of t.
Appendix B T echnical Support R esources NI 4050 User Manual B-2 www .ni. com Software-Related Resources • Instrument Driver Network —A library with hundreds of in strument dri v ers fo r control of standalone instruments via GPIB, VXI, or serial interfaces.
© National Instruments Corporation G-1 NI 4050 User Manual Glossar y Pref ix Meanings V alue p- pico- 10 –1 2 n- nano- 10 –9 µ- micro- 10 –6 m- milli- 10 –3 k- kilo- 10 3 M- mega- 10 6 G- gi.
Glossary NI 4050 User Manual G-2 www.ni.com ADC analog-to-digital con verter—an electronic de vice, often an integrated circuit, that con verts an analog v oltage to a digital number ADC resolution the resolution of the ADC, which is measured in bits.
Glossary © National Instruments Corporation G-3 NI 4050 User Manual CompactPCI refers to the core specif ication defined by the PCI Industrial Computer Manufacturer’ s Group (PICMG ) con version de vice de vice that transforms a signal from one form to another .
Glossary NI 4050 User Manual G-4 www.ni.com dielectric absorption a parasitic phenomenon related to capacitors that can cause une xpectedly long settling times in circu its usin g capacitors with poor.
Glossary © National Instruments Corporation G-5 NI 4050 User Manual H harmonics multiples of th e fundamental frequency of a signal half-po wer bandwidth the frequency range over which a circuit main.
Glossary NI 4050 User Manual G-6 www.ni.com ISA industry standard architecture isolation a type of signal conditioning in which you isolate the transducer signals from the computer for safety purposes.
Glossary © National Instruments Corporation G-7 NI 4050 User Manual P PCI Peripheral Component Interconnect—a high-performance expansion bu s architecture originally dev eloped by Intel to replace .
Glossary NI 4050 User Manual G-8 www.ni.com S s seconds S samples sense in four -wire resistance the sense measures the v oltage across the resistor being excited b y th e excitation current settling .
Glossary © National Instruments Corporation G-9 NI 4050 User Manual V V volts V A C volts alternating current VDC volts direct current V error voltage error VI virtual instrument—(1) a combination .
© National Instruments Corporation I-1 NI 4050 User Manual Index A AC current specifications, A-4 AC voltage measurement, 2-6 to 2 -8 AC offset voltage, 2-7 frequency response, 2-7 to 2-8 input range.
Index NI 4050 User Manual I-2 © National Instruments Corporation using VirtualBench-DMM Soft Front panel, 1-5 to 1-6 current, 1-8 DC voltage, 2-2 to 2 -6 common mode reject io n , 2-6 to 2-7 effectiv.
Index © National Instruments Corporation I-3 NI 4050 User Manual S safety instructions, 2-1 soft front panel . See VirtualBench-DMM Sof t Front panel.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il National Instruments NI 4050 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del National Instruments NI 4050 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso National Instruments NI 4050 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul National Instruments NI 4050 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il National Instruments NI 4050, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del National Instruments NI 4050.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il National Instruments NI 4050. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo National Instruments NI 4050 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
