trouble in communicating with oscilloscopy

[xiaoguo]

I am using a AT-GPIB/TNT card to control my instruments and communicate with oscilloscoy TDS3052B. All things looks properly working.

I can read waveform data real-time from scopy and plot these data to a graph. Unfortunately, I only can read 500 points from scopy one time, even I have tried to increase or decrease the points arrange, like the command for TDS3052B "DATa:Start 1; DATa:Stop 1000; CURVe?". I am really puzzled with it.

Would you please to give me any suggests to check it? many thanks. I use labview 6.0 program.

[Dennis_Knutson]

If the horizontal record length is only set to 500 points, that's all that you'll get and your command to request more will have no effect. Are you using the available driver or are you writing your own? If you're doing your own, why? The driver has a function called tktds3K Configure Acquisition Record that sets the minimum record length. Also, the type of acquisition will affect record length.

[xiaoguo]

Thanks a lot! I have checked my programs again and found a mistake. Now, they are working well.