NATIONAL INSTRUMENTS PXI-6624 Counter Timer Module
Mgbakọ
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Ngwa ngwa chọrọ
Calibrating the NI 6624 requires installing NI-DAQmx 7.5 or later on the calibration system. You can download NI-DAQmx at ni.com/downloads.NI-DAQmx supports programming an External Calibration in the LabVIEW, LabWindows™/CVI™, Microsoft Visual C++ 6.0, Microsoft VisualBasic 6.0, Microsoft .NET, and Borland C++ application development environments (ADEs). When you install NI-DAQmx, you only need to install support for the ADE that you intend to use.
Mara: NI na-atụ aro ka ị wụnye ngwa ọkwọ ụgbọala NI-DAQmx tupu ịwụnye ngwaọrụ NI 6624.
Achọrọ akwụkwọ
For information about NI-DAQmx and NI 6624, you can consult the following documents:
- NI-DAQmx Help—Nke a na-enyere aka file nwere ozi izugbe gbasara echiche nha, isi NI-DAQmx, yana ngwa nkịtị na-emetụta gburugburu mmemme niile.
- NI-DAQmx C Reference Help—Nke a na-enyere aka file contains C references and general information about measurement concepts.
- DAQ Getting Started guides—These guides describe how to installNI-DAQmx for Windows software and NI-DAQmx-supported DAQdevices, and how to confirm that your device is operating properly.
- NI 6624 User Manual—This document describes the electrical and mechanical aspects of the NI 6624 and contains information about its operation and programming.
- NI 6624 Specifications—This document lists the specifications for theNI 6624. The limits you use to verify the accuracy of the device are based on the specifications found in this document. You can download the latest version of this document from the NI Web saịtị na ni.com/manuals.
Eji NI-DAQmx tinye akwụkwọ ndị a. Ị nwekwara ike ịhụ ụdị akwụkwọ ọhụrụ kachasị ọhụrụ na ni.com/manuals.
Ogologo oge nhazi nhazi
NI na-atụ aro ka ị rụọ nhazi nhazi zuru oke ọbụlagodi otu ugboro kwa afọ. Ị nwere ike ibelata oge a dabere na mkpa ngwa gị ziri ezi.
Ngwa nnwale
NI na-atụ aro ka ị jiri akụrụngwa dị na Tebụl 1 maka ịhazi NI 6624.
Tebụl 1. Ngwa akwadoro
|
Akụrụngwa |
Ụdị akwadoro |
Ihe achọrọ kacha nta |
| Mpụga counter | PXI-6608 | £1 ppm uncertainty for measurement |
| +5 V Isi Iyi Ike | - | Must be able to source current of at least 1 A. |
| Discrete Resistors | - | 5% precision
Resistor values: 500 W (´ 2) |
| USB | SH100-100-F | - |
| ngọngọ njikọ | SCB-100 | - |
Mara: Ị ga-achọkwa ihe nkwụnye CompactPCI-to-PCI ma ọ bụrụ na ị na-emezi PXI-6624.
Soro ntuziaka ndị a ka ịkwalite akụrụngwa na gburugburu ebe obibi n'oge mmezi:
- Debe njikọ na ngwaọrụ dị mkpụmkpụ ka enwere ike. Ogologo eriri na waya na-arụ ọrụ dị ka antennae, na-ebuli mkpọtụ ọzọ nwere ike imetụta nha.
- Nyochaa na njikọ niile na ngwaọrụ ahụ, gụnyere njikọ ihu panel, nwere nchebe.
- Debe okpomọkụ nke gburugburu 25 Celsius. Okpomọkụ ngwaọrụ ga-adị ukwuu karịa okpomọkụ gburugburu.
- Debe iru mmiri dị n'okpuru 80%.
- Kwe ka oge ikpo ọkụ nke opekata mpe nkeji iri na ise iji hụ na sekit nke nha na-arụ ọrụ nke ọma.
- Use shielded copper wire for all cable connections to the device. Usetwisted-pairs wire to eliminate noise and thermal offsets.
- Gbaa mbọ hụ na edobere ọsọ fan chassis PXI ka ọ bụrụ HIGH, na ihe nzacha ndị fan dị ọcha, yana oghere ndị na-adịghị nwere oghere nwere oghere. Maka ozi ndị ọzọ, rụtụ aka na akwụkwọ ndetu mmanye-ikuku jụrụ oyi dị na ni.com/manuals.
- Tinye chassis na ngwa ahụ n'otu eriri ọkụ ka ịzena loops ala.
Pinout ngwaọrụ
Figure 1 shows the pinout of the NI 6624.
Usoro nhazi nhazi
When calibrating the NI 6624, you first use the 20 MHz timebase on theNI 6624 as the source to generate a 1 Hz square wave signal. The external counter measures the frequency of the square wave signal. You then calculate the frequency of the crystal oscillator to determine if the NI 6624 is operating within its specifications. Figure 2 illustrates the calibration process.
Ntụle ugboro ole nwere ejighị n'aka nke ruru nchikota nke igbu oge mgbasa nke NI 6624 na njehie nke counter mpụga. Ogologo oge mgbasa kachasị bụ 500 ns. N'iji oge nleta nke 1 s, enwere ike gbakọọ ejighị n'aka ịgbasa mgbasa dị ka ndị a:
500 ns/1 s = 0.5 ppm
The error of the external counter must be 1 ppm or less, as specified in the Test Equipment section of this document. The measurement uncertainty equals the sum of 0.5 ppm and 1 ppm, that is, 1.5 ppm. Therefore, the calculated frequency allows for a 1.5 ppm measurement uncertainty. Youcan reduce measurement uncertainty by using a more stable external counter, by increasing the measurement duration, or both.
Usoro nhazi nhazi gụnyere usoro ndị a:
- Initial Setup—Set up the test equipment for calibration.
- Verification—Verify the existing operation of the device. This step confirms whether the device is operating within its specifications.
Rụtụ aka na ntuziaka mmalite DAQ maka ozi gbasara otu esi etinye ngwanrọ na ngwaike yana otu esi ahazi ngwaọrụ na Measurement & Automation Explorer (MAX). NI na-atụ aro ka ị jiri PXI-6608 weta counter mpụga. Ị nwere ike iji counter ọzọ ma ọ bụrụ na ọ na-emezu ihe ndị a chọrọ ka akọwara na ngalaba Ngwa ule nke akwụkwọ a.
Mara: If you are calibrating the PXI-6624 on a PXI chassis, the measured frequency is that of the PXI backplane clock instead of the onboard crystal oscillator. To verify the onboard crystal oscillator, you must calibrate the PXI-6624 on a PCI chassis using a CompactPCI-to-PCI adapter
Mezue usoro ndị a ka ịtọlite akụrụngwa nnwale maka nhazigharị:
- USB NI 6624 gaa na ngọngọ njikọ 100-pin.
- Kpoo isi iyi ike +5 V na ngọngọ njikọ. Rụtụ aka na eserese 3 maka njikọ mmezi.
- a. Wụnye ọdụ ọkụ +5 V na ọdụ ngọngọ njikọ jikọtara na PFI 36 Vdd/CTR 0 Vdd pin (pin 7) na NI 6624.
- b. Waya ala nke isi iyi ike +5 V na ọdụ ngọngọ njikọ nke ejikọrọ na PFI 36 Vss/CTR 0 Vss pin (pin 8) na NI 6624.
- Wire a 500 Ω resistor between the connector block terminals that are connected to the PFI 36 Vdd/CTR 0 Vdd pin (pin 7) and PFI 36/CTR0 OUT pin (pin 9) on the NI 6624. Wire another 500 Ω resistor to the connector block terminal that is connected to the PFI 36/CTR 0 OUTpin (pin 9) on the NI 6624, as Figure 3 shows.
- Jikọọ counter mpụga na ngọngọ njikọ site na iji waya gbagọrọ agbagọ.
- a. Wire the input of the external counter to the other end of the 500 Ωresistor that is connected to the PFI 36/CTR 0 OUT pin (pin 9) onthe NI 6624.
- b. Wire the ground of the external counter to the connector block terminal that is connected to the PFI 36 Vss/CTR 0 Vss pin (pin 8)on the NI 6624.
Complete the following steps to verify the operation of the crystal oscillator the NI 6624:
- Configure counter 0 on the NI 6624 to generate a 1 Hz continuous square wave signal with a 50% duty cycle on the PFI 36/CTR 0 OUTpin (pin 9).
- Tulee ugboro nke mgbama emepụtara site na iji mpụta mpụta. Ọ nwere ike were oge maka counter mpụga iji tụọ mgbama 1 Hz.
- Jiri 20,000,000 mụbaa ugboro a tụrụ atụ iji gbakọọ ọnụọgụ mkpụrụ akụ kwesịrị ime n'otu sekọnd.
- Tụlee uru ugboro ole ị gbakọrọ site na nsonaazụ nha yana ụkpụrụ ndị a:
- a. If the frequency you measured falls between the upper limit of 20,001,000 Hz and the lower limit of 19,999,000 Hz, your device’s operating within its specifications.
- b. If the frequency you measured is above 20,001,000 Hz or below 19,999,000 Hz, your device is nonfunctional. Return the device toNI for repair or replacement.
Mara: Oke n'ime akwụkwọ a dabere na mbipụta Disemba 2006 nke nkọwapụta NI 6624. Rụtụ aka na nkọwapụta NI 6624 kacha ọhụrụ n'ịntanetị na ni.com/manuals. Ọ bụrụ na ụdị nkọwapụta dị nso nso a, gbakọọ oke dabere na nkọwapụta kachasị ọhụrụ.
Ebe aga maka nkwado
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Akwụkwọ a nwere ozi maka ịhazi ngwaọrụ counter/ngụ oge nke mba 6624. Maka ozi ndị ọzọ gbasara nhazigharị, gaa na ni.com/calibration. ni.com/manuals.
Akwụkwọ / akụrụngwa
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NATIONAL INSTRUMENTS PXI-6624 Counter Timer Module [pdf] Ntuziaka onye ọrụ PXI-6624, PCI-6624, 6624, PXI-6624 Counter Timer Module, Counter Timer Module, Timer Module, Module |