lost some data points

[jli]

I am using LabView to control HP4191A Impedance Analyzer to do measurements. My frequency is forom 1M-1GHz,step is 1MHz. Firstly the Impedance Analyzer measures three groups of calibration data. And then it measures sample data. then use those four data to di calculation, and show me the final results.And the program works well except some data points of final results are lost from 50M to 80MHz. I checked the equipment, it measures all the time, and calibration data seem ok. So the problem probably is not in equipment, maybe something wrong in the LabView program. Does anyone has any clue that what is wrong here? A big thanks.

[JLS]

It could be that the program simply does not read enough times to get the later part of the data you would like. I am not sure how you are connecting to your instrument, but you may want to check your LabVIEW program to see that it is, in fact, programmed to get all the data you request. You can post again with more information, such as how you are connecting to the instrument and whether or not you are using a prewritten LabVIEW driver (as opposed to writing your own code from scratch to communicate with the instrument), with which we may be able to better narrow down the problem.

Best Regards,

JLS
Applications Engineer
National Instruments

[jli]

I use GPIB to connect to the equipment. and I am using the existed HP4191A Instrument Drivers. I think the problem is in LabView program. If you guys need, I can post the whole program. thanks