National Instruments NI PXI-562X Скачать руководство пользователя страница 30 | Manualshive

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National Instruments NI PXI-562X Скачать руководство пользователя страница 30

Glossary

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National Instruments Corporation

G-7

NI PXI-562x User Manual

R

R

resistor

RAM

random-access memory

random interleaved
sampling (RIS)

method of increasing sample rate by repetitively sampling a repeated
waveform

real-time sampling

sampling that occurs immediately

record length

the size of a chunk (or record) of data that can be or has been acquired by a
device

resolution

The smallest amount of input signal change that an instrument or sensor can
detect. Resolution can be expressed in bits, in proportions, or in percent
of full scale. For example, a system has 12-bit resolution, one part in
4,096 resolution, and 0.0244% of full scale.

rms

root mean square—a measure of signal amplitude; the square root of the
average value of the square of the instantaneous signal amplitude

ROM

read-only memory

S

s

seconds

S

samples

S/s

samples per second—used to express the rate at which an instrument
samples an analog signal

sample rate

the speed that a device can acquire data

sense

in 4-wire resistance the sense measures the voltage across the resistor
being excited by the excitation current

settling time

the amount of time required for a voltage to reach its final value within
specified limits

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Содержание NI PXI-562X

Страница 1: ...Computer Based Instruments NI PXI 562x User Manual High Speed Frequency Domain Digitizer NI PXI 562x User Manual July 2002 Edition Part Number 322949C 01...

Страница 2: ...14 24 24 Germany 089 741 31 30 Greece 01 42 96 427 Hong Kong 2645 3186 India 91 80 4190000 Israel 03 6393737 Italy 02 413091 Japan 03 5472 2970 Korea 02 3451 3400 Malaysia 603 9596711 Mexico 001 800...

Страница 3: ...ents installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third part...

Страница 4: ...ments could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been tested and found to comply with the limits for a Cl...

Страница 5: ...ought for OEMs if also available from an original manufacturer that also markets in the EU or where compliance is not required as for electrically benign apparatus or cables To obtain the DoC for this...

Страница 6: ...3 Safety Information 1 4 Chapter 2 Hardware Overview How the NI 562x Works 2 1 Connecting Signals 2 2 Conditioning the Signal Impedance Dither Gain and AC Coupling 2 3 Input Impedance 2 3 Dither 2 3 D...

Страница 7: ...on 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 This icon denotes a note which alerts you to impor...

Страница 8: ...x ni com Related Documentation The following documents contain information that you might find helpful as you read this manual NI PXI 5620 Specifications NI PXI 5621 Specifications NI SCOPE User Manua...

Страница 9: ...e NI PXI 5621 Specifications documents for NI PXI 562x performance specifications This chapter provides information on installing connecting signals to and acquiring data from the NI 562x modules The...

Страница 10: ...installation does not start automatically navigate to your CD drive and click setup exe Caution You must turn off and unplug your chassis before installing your device To prevent damage due to electr...

Страница 11: ...sfully installed and configured the necessary software and hardware to use your NI 562x Acquiring Data Programmatically You can acquire data programmatically either by writing an application for your...

Страница 12: ...an explosive atmosphere or where there may be flammable gases or fumes Operate the product only at or below the pollution degree stated in the NI PXI 5620 Specifications and the NI PXI 5620 Specifica...

Страница 13: ...stallation Category II are measurements on household appliances portable tools and similar equipment Installation Category III is for measurements performed in the building installation This category...

Страница 14: ...Chapter 1 Taking Measurements with the NI PXI 562x NI PXI 562x User Manual 1 6 ni com Below is a diagram of a sample installation...

Страница 15: ...r are applied to the signal Refer to the Conditioning the Signal Impedance Dither Gain and AC Coupling section for more information 3 The ADC converts the signal from analog to digital Refer to the Di...

Страница 16: ...connectors and an SMB connector One of the SMA connectors INPUT is for attaching the analog input signal you want to measure The second SMA connector REF CLK IN is a 50 10 MHz AC coupled reference inp...

Страница 17: ...Rin is the input impedance of the NI 562x Rs is the output impedance of the external device If the signal you are measuring has an output impedance other than 50 your measurements are affected by thi...

Страница 18: ...amount of memory For spectral analysis you can use a smaller faster FFT to look at only the band passed through the DDC Refer to the NI SCOPE VI Reference Help for specific DDC attributes you can use...

Страница 19: ...performs frequency translation filtering and decimation after signals go through the ADC Refer to the Incorporating the DDC section for more information The PLL uses a phase detector to synchronize t...

Страница 20: ...you can configure the NI 562x to begin another acquisition that is stored in another memory record on the device This process is a multiple record acquisition To perform multiple record acquisitions...

Страница 21: ...ignals with a minimum pulse width requirement of 100 ns or 16 ns times the DDC decimation Figure 2 5 Digital Trigger Sources Calibration Although the NI 562x is factory calibrated it needs periodic ca...

Страница 22: ...he following timing and triggering features that you can use for synchronizing multiple digitizers System Reference Clock A 10 MHz clock on the PXI backplane with 100 ppm accuracy It is independently...

Страница 23: ...Assisted Support Options Contact NI engineers and other measurement and automation professionals by visiting ni com ask Our online system helps you define your question and connects you to the experts...

Страница 24: ...ossary Prefix Meanings Value p pico 10 12 n nano 10 9 micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 109 Symbols percent positive of or plus negative of or minus per degree plus or minus ohm les...

Страница 25: ...of signal conditioning that improves accuracy in the resulting digitized signal and reduces noise amplitude flatness a measure of how close to constant the gain of a circuit remains over a range of f...

Страница 26: ...ng a default parameter value recorded in the driver In many cases the default input of a control is a certain value often 0 that means use the current default setting differential input an analog inpu...

Страница 27: ...are trying to measure G gain the factor by which a signal is amplified sometimes expressed in decibels H hardware the physical components of a computer system such as the circuit boards plug in boards...

Страница 28: ...level the relative priority at which a device can interrupt ISA industry standard architecture L LabVIEW Laboratory Virtual Instrument Engineering Workbench a program development application based on...

Страница 29: ...e overrange a segment of the input range of an instrument outside of the normal measuring range Measurements can still be made usually with a degradation in specifications P PCI Peripheral Component I...

Страница 30: ...in proportions or in percent of full scale For example a system has 12 bit resolution one part in 4 096 resolution and 0 0244 of full scale rms root mean square a measure of signal amplitude the squa...

Страница 31: ...according to temperature See also thermal drift thermal drift measurements that change as the temperature varies thermal EMFs thermal electromotive forces voltages generated at the junctions of dissim...

Страница 32: ...ally used with a PC that has the functionality of a classic stand alone instrument 2 a LabVIEW software module VI which consists of a front panel user interface and a block diagram program Vrms volts...

Страница 33: ...1 D data acquisition multi record acquisitions 1 3 2 6 programmatically 1 3 data storing in memory 2 4 DDC digital downconverter incorporating 2 4 overview 2 4 dead time in multiple record acquisitio...

Страница 34: ...e 2 2 installing software and hardware 1 1 safety information 1 4 NI SCOPE driver 1 1 O online technical support A 1 P phase detector 2 5 phase locked loop PLL 2 5 phone technical support A 1 professi...

Страница 35: ...pport A 1 TIO timing engine 2 6 training customer A 1 trigger and clock routing area 2 6 triggering digital trigger sources figure 2 7 overview 2 7 troubleshooting resources A 1 V voltage controlled c...

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