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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.
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