Engineering Design NIDisk Guia do Utilizador descarregar pdf (Página 28)

NIDisk User Guide

4. If NIDisk has (or may have) terminated abnormally, it may be running as a

"phantom" process and preventing other NIDisk processes from operating correctly.

To check this in Windows XP, open Windows Task Manager by hitting Ctrl-Alt-Del,

select the Processes tab, and click Image Name to view the task names in alphabetical

order. Select each "nidisk.exe" task and click End Process to terminate it. Then

launch NIDisk again. If NIDisk still will not perform I/O operations, proceed to the

next step.

5. Run Measurement & Automation Explorer (MAX) and perform the troubleshooting

steps described in "Confirm and troubleshoot I/O card and driver installation" under

"National Instruments" in Appendix C of the SIGNAL Reference Guide. If MAX

does not recognize the device or reports a problem, proceed to the next step.

6. Reboot the computer, then run MAX again. If MAX still reports a problem, proceed

to the next step.

7. Uninstall and reinstall the National Instruments system driver and board driver for the

I/O device, as described under "National Instruments" in Appendix C of the SIGNAL

Reference Guide.

Minimum and Maximum Duration

Minimum acquisition and playback duration is 0.1 seconds. Maximum acquisition and

playback duration is the capacity of the hard disk.

Minimum and Maximum Sample Rate

Minimum sample rate is 100 Hz for acquisition and playback. Maximum sample rate is

determined by the analog I/O card. NIDisk has been tested with a 12-bit, 500 kHz PCMCIA

notebook analog I/O card (model DAQCard-6062E) and a 16-bit, 1.5 MHz PCI desktop

analog I/O card (model PCI-6251). See "Technical Specifications" for more detail.

I/O Errors

Acquisition and playback errors arise when the I/O board cannot convert data, or when

NIDisk cannot cannot store or retrieve data from memory or the hard disk, at the requested

sample rate. NIDisk will issue messages similar to the following. Possible causes include

performing demanding processes in parallel with NIDisk, a slow CPU, or a slow hard disk.

Remedies are to terminate other processes, defragment the hard disk, increase CPU or disk

capabilities, or reduce sample rate.

Following are two sample acquisition error messages (the verboseness is from the

manufacturer, not NIDisk!):

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 34 35 36

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