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National Instruments NI-9218 Channel Analogue Input Module

National- Instruments NI-9218- Channel Analog- Input- Module-PRODUCT

Specifikationer

  • Produktnavn: NI-9218
  • Stiktyper: LEMO og DSUB
  • Måletyper: Indbygget understøttelse af forskellige typer
  • Sensorekscitation: Valgfri 12V-ekscitation

Konnektortyper

NI-9218 har mere end én stiktype: NI-9218 med LEMO og NI-9218 med DSUB. Medmindre stiktypen er angivet, refererer NI-9218 til begge stiktyper.
NI-9218 Pinout

National- Instruments NI-9218- Channel Analog- Input- Module-FIG (1)

Signals by Measurement Type

Mode Stift

1

1 2 3 4 5 6 7 8 9 10
±16 V EX+ AI-, EX- AI+
±65 mV EX+ 2 [2] EX- [2] AI+ AI- 3
Fuld-

Bro

EX+ [2] EX- [2] RS+ RS- AI+ AI- SC SC
IEPE AI+ AI-
TEDS T+ 4 T- T+ 5

Signalbeskrivelser

Signal Beskrivelse
AI+ Positive analogue input signal connection
AI- Negative analogue input signal connection
EX+ Positive sensor excitation connection
EX- Negative sensor excitation connection
RS+ Positive remote sensing connection
RS- Negative remote sensing connection
SC Shunt calibration connection
T+ TEDS data connection
T- TEDS return connection

Måletyper

NI-9218 har indbygget understøttelse af følgende måletyper.

  • ±16 V
  • ±65 mV
  • Full-Bridge
  • IEPE
  •  NI-9218 with LEMO only.
  •  Optional sensor excitation.
  • Tie to pin 3.
  • TEDS Class 1 data connection.
  •  TEDS Class 2 data connection.

Tip NI recommends using the NI-9982 screw-terminal adapter when using built-in measurement types on the NI-9218.

NI-9218 understøtter yderligere følgende måletyper, når der anvendes en målespecifik adapter.

  • ±20 mA, requires the NI-9983
  • ±60 V, requires the NI-9987
  • Half-Bridge requires the NI-9986
  • Quarter-Bridge requires the NI-9984 (120 Ω) or NI-9985 (350 Ω)

±16 V-tilslutningerNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (2)

NI-9218 har valgfri 12 V sensorexcitation. For at bruge 12 V excitationen skal du tilslutte en 9 VDC til 30 VDC strømforsyning til Vsup, tilslutte excitationsterminalerne på din sensor til EX+/EX- og aktivere 12 V excitation i din software.

Relateret reference:

  • NI-9982 ±16 V Tilslutningsudtag

±65 mV-tilslutningerNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (7)

  • You must connect AI to EX- on the NI-9218.
  • NI-9218 har valgfri 12 V sensorexcitation. For at bruge 12 V excitationen skal du tilslutte en 9 VDC til 30 VDC strømforsyning til Vsup, tilslutte excitationsterminalerne på din sensor til EX+/EX- og aktivere 12 V excitation i din software.

Relateret reference

  • NI-9982 ±65 mV Tilslutningsudtag

FuldbroforbindelserNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (4)

  • The NI-9218 provides 2 V excitation to loads ≥120 Ω or 3.3 V excitation to loads ≥350 Ω.
  • The NI-9218 provides optional connections for remote sensing (RS) and shunt calibration (SC). Remote sensing corrects for errors in excitation leads, and shunt calibration corrects for errors caused by resistance within one leg of the bridge.

Relateret reference:

  • NI-9982 Full-Bridge-forbindelses pinout

IEPE-forbindelserIEPE-forbindelser

  • The NI-9218 provides an excitation current for each channel that powers IEPE sensors.
  • AI+ provides DC excitation, and AI- provides the excitation return path.

Relateret reference:

  • NI-9982 IEPE Connection Pinout

±20 mA-tilslutningerNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (6)

  • Connecting ±20 mA signals requires the NI-9983.
  • NI-9218 har valgfri 12 V sensorexcitation. For at bruge 12 V excitationen skal du tilslutte en 9 VDC til 30 VDC strømforsyning til Vsup, tilslutte excitationsterminalerne på din sensor til EX+/EX- og aktivere 12 V excitation i din software.

Connecting a loop-powered 2-wire or 3-wire transducer requires adding a 20 kΩ resistor between AI- and Ex-.National- Instruments NI-9218- Channel Analog- Input- Module-FIG (7)

Relateret reference:

  • NI-9983 Pinout

±60 V-tilslutningerNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (8)

Connecting ±60 V signals requires the NI-9987.
Relateret reference:

  • NI-9987 Pinout

HalvbroforbindelserNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (9)

  • Connecting half bridges requires the NI-9986.
  • The NI-9218 provides 2 V excitation to half bridges of ≥240 Ω total or 3.3 V excitation to half bridges of ≥700 Ω total.
  • The NI-9218 provides optional connections for remote sensing (RS) and shunt calibration (SC). Remote sensing corrects for errors in excitation leads, and shunt calibration corrects for errors caused by resistance within one leg of the bridge.

Relateret reference:

  • NI-9986 Pinout

KvartbroforbindelserNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (10)

  • Connecting 120 Ω quarter bridges requires the NI-9984.
  • Connecting 350 Ω quarter bridges requires the NI-9985.

Tip NI-recommends 2 V excitation when using a NI-9984 with 120 Ω quarter bridges and 3.3 V excitation when using the NI-9985 with 350 Ω quarter bridges.

Relateret reference:

  • NI-9984/9985 Pinout

TEDS-forbindelserNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (11)

For more information about TEDS, visit ni.com/info and enter the Info Code rdteds.

TEDS-støtte

  • TEDS Klasse 1-sensorer fungerer som en grænseflade til overførsel af information fra sensorer. NI-9218 med LEMO, NI-9218 med DSUB, NI-9982L, NI-9982D, NI-9982F understøtter TEDS Klasse 1-sensorer.
  • TEDS Class 2 sensors provide an interface for transferring information from TEDS-enabled sensors. The NI-9218 with LEMO, NI-9982L, NI-9983L, NI-9984L, NI-9985L, and NI-9986L support TEDS Class 2 sensors.

    Vsup Daisy Chain-topologiNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (12)

NI-9218 med LEMO har fire ben på Vsup-stikket til daisy chaining.
NI-9218 Tilslutningsretningslinjer

Make sure that the devices you connect to the NI-9218 are compatible with the module specifications.

Retningslinjer for brugerdefineret kabelføring

  • Overhold følgende retningslinjer, når du bruger NI-9988 loddekopstikadapteren eller LEMO-krympestikket (784162-01) til at lave brugerdefinerede kabler.
  • Use a shielded cable for all signals.
  • Connect the cable shield to the earth ground.
  • Use twisted-pair wiring for the AI+/AI- and RS+/RS- signals to achieve specified EMC performance.National- Instruments NI-9218- Channel Analog- Input- Module-FIG (13)

NI-9218 BlokdiagramNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (14)

  • Two 24-bit analogue-to-digital converters (ADCs) simultaneously sampbegge AI-kanaler.
  • The NI-9218 provides channel-to-channel isolation.
  • The NI-9218 reconfigures the signal conditioning for each measurement type.
  • The NI-9218 provides excitation for IEPE and bridge completion measurement types.
  • The NI-9218 can provide optional 12 V sensor excitation for ±16 V, ±65 mV, and ±20 mA measurement types.

±16 V og ±65 mV signalbehandlingNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (15)

Indgangssignaler på hver kanal bufferes, konditioneres og derefter sampledet af en ADC.

Fuldbro signalbehandlingNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (16)

  • The analogue input connections sense and then amplify the incoming analogue signal.
  • The excitation connections provide differential bridge-excitation voltage.
  • Remote sensing continuously and automatically corrects for lead-wire induced excitation voltage loss when using the RS connections.
  • Shunt calibration can be used to correct for lead-wire-induced desensitisation of the bridge.

IEPE-signalbehandling

National- Instruments NI-9218- Channel Analog- Input- Module-FIG (17)

  • The incoming analogue signal is referenced to an isolated ground.
  • Each channel is configured for AC coupling with an IEPE current.
  • Each channel provides a TEDS Class 1 interface.

±20 mA signalbehandlingNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (18)

The NI-9983 provides a current shunt for the incoming analogue signal.

±60 V signalbehandlingNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (19)

The NI-9987 provides an attenuator for the incoming analogue signal.

Halvbro-signalbehandlingNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (20)

  • The NI-9886 provides half-bridge completion resistors for the incoming analogue signal.
  • You must connect AI+, EX+, and EX-.
  • RS+ and RS- connections are optional.
  • You do not need to connect the AI signal because it is connected internally.

Kvartbro-tilstandsbetingningNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (21)

The NI-9984 and NI-9985 provide a quarter-bridge completion resistor and a half-bridge completion resistor.
Filtrering
The NI-9218 uses a combination of analogue and digital filtering to provide an accurate representation of in-band signals while rejecting out-of-band signals. The filters discriminate between signals based on the frequency range, or bandwidth, of the signal. The three important bandwidths to consider are the passband, the stopband, and the alias-free bandwidth.
NI-9218 repræsenterer signaler inden for pasbåndet, primært kvantificeret ved pasbåndsripple og faseulinearitet. Alle signaler, der vises i den aliasfri båndbredde, er enten ualiaserede signaler eller signaler, der er blevet filtreret med mindst samme mængde stopbåndsafvisning.

Passband

Signalerne i pasbåndet har frekvensafhængig forstærkning eller dæmpning. Den lille variation i forstærkning i forhold til frekvens kaldes pasbåndets fladhed. De digitale filtre i NI-9218 justerer pasbåndets frekvensområde, så det matcher datahastigheden. Derfor afhænger mængden af ​​forstærkning eller dæmpning ved en given frekvens af datahastigheden.

Stopbånd
Filteret dæmper alle signaler over stopbåndsfrekvensen betydeligt. Filterets primære mål er at forhindre aliasing. Derfor skalerer stopbåndsfrekvensen præcist med datahastigheden. Stopbåndsafvisningen er den minimale dæmpning, som filteret anvender på alle signaler med frekvenser inden for stopbåndet.

Aliasfri båndbredde
Any signal that appears in the alias-free bandwidth of the NI-9218 is not an aliased artefact of signals at a higher frequency. The alias-free bandwidth is defined by the ability of the filter to reject frequencies above the stopband frequency, and it is equal to the data rate minus the stopband frequency.

Åbning af en måleadapter

Hvad skal man gøreNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (22)

  • Unlock the measurement adapter housing/cover.
  • Slide the measurement adapter housing/cover to access the screw terminals.

Montering af NI-998xD/998xL
Hvad skal man bruge

  • NI-998xD or NI-998xL Measurement Adapter
  • M4 or Number 8 Screw
  • Skruetrækker

Hvad skal man gøreNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (23)

Mount the measurement adapter to a flat surface using the mounting hole on the measurement adapter and the screw.

Jordforbindelse til måleadapter

Jordterminalerne på en måleadapter er forbundet til chassisjord, når måleadapteren er tilsluttet NI-9218, og NI-9218 er installeret i et chassis.

Måleadapterens pinouts

De følgende afsnit indeholder pinouts til NI-9218 måleadapterne.

NI-9982 ±16 V TilslutningsudtagNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (24)

Pins 3a and 3b are tied together on the NI-9982.
Relateret reference:

  • ±16 V-tilslutninger

NI-9982 ±65 mV Tilslutningsudtag

Pins 3a and 3b are tied together on the NI-9982.

Relateret reference:

  • ±65 mV-tilslutninger

NI-9982 Full-Bridge-forbindelses pinout

Pins 3a and 3b are tied together on the NI-9982.

Relateret reference:

  • Fuldbroforbindelser

 

NI-9982 IEPE Connection Pinout

Pins 3a and 3b are tied together on the NI-9982.
Relateret reference:

  • IEPE-forbindelser
    NI-9983 PinoutNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (26)

Pins 3a and 3b are tied together on the NI-9983.
Relateret reference:

  • ±20 mA-tilslutninger
    NI-9984/9985 PinoutNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (27)

Relateret reference:

  • Kvartbroforbindelser
    NI-9986 PinoutNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (28)

Pins 3a and 3b are tied together on the NI-9986.
Relateret reference:

  • Halvbroforbindelser
    NI-9987 PinoutNational- Instruments NI-9218- Channel Analog- Input- Module-FIG (29)

Pins 3a and 3b are tied together on the NI-9987.
Relateret reference:

  • ±60 V-tilslutninger

FAQ

Dokumenter/ressourcer

National Instruments NI-9218 kanal analog indgangsmodul [pdf] Brugsanvisning
NI-9218 med LEMO, NI-9218 med DSUB, NI-9218 Kanal analogt indgangsmodul, NI-9218, Kanal analogt indgangsmodul, Analogt indgangsmodul, Indgangsmodul

Referencer

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