LCR meter control

[Dennis_Knutson]

That makes no sense. Does the instrument have a 485 interface or are you converting from an RS-485 interface in the pc to RS-232?

In any case, look at the 34401 example. It does not matter if it's RS-485 or RS-232. The code is the same.

You don't convert anything to use USB. The instrument has to have this interface. You plug it in. make sure you have the USB driver from Agilent.

[Plexonite]

Hello jszarra.  I used would recommend using a USB or GPIB interface.  I submitted my VI in a previous posting which uses the USB interface.  My VI was used to to perform C-V measurements using the list sweep.  Is there any reason why you cannot use a USB connection? 

[jszarra]

Hi, im back with the LCR meter after 2 weeks! Now im looking for the usb cable to test the connection between the instrument and my pc. Thanks for your help! I was wondering if the examples for de 4980a can work using an RJ-45 Input!. Because that is the input that we use here with another software. I think that it may be possible, but some changes are going to be required in the block diagram. If anyone knows something about this, the info would be awesome!

[jszarra]

Hi, I was finally able to get communication between the 4980 and the pc! Now I have other questions. Is there any way to use the Read Measurement example for making multiples tests and saving all the results so it can be displayed on the vi? Just like the original, but only that in this one, you can only see a single measurement. For example, we have another software, and you can specify the amount of time for the instrument to make tests and save the results in an excel file. Im also interested in displayin a graph in the vi. I dont know if all this is possible because I have no experience using LabView. Sorry for asking to many questions and I would appreciate any suggestions!.

[Plexonite]

If you would like to use Read Measurement to perform multiple test use a for loop or you can use the sweep command but you are limited to 201 points.  To specify the amount of time use the configure apeture vi which will allow you to adjust the integration time(short, medium, long).  To display the graph I reccomend a xy graph.  To do this, use the index and bundle cluster array. 

[jszarra]

Thanks MATE!

[jhkhjg]

Hi, sorry in advance for my English, I'm not a native. Also I'm beginner in Labview.

I'd like to make an automatic measurement of impedance and  phase in Labview using Agilent E4980A in a broad range of frequencies (from 20 Hz to 100 kHz). Also I need to write my measurement data to the file. I can't find any working example of it.  

[jhkhjg]

This programme (which is an example from Agilent) is working for one frequency. How to develop it to make measurements in broad range of frequencies?

[NathanS]

Hi jhkhjg,

I don't know if this helps or not, but I found another example VI you could look at to try and take measurements across a broad range of frequencies. Please see the attached VI.

Regards,

[jhkhjg]

Hi, thanks, but I've seen this programme before too. I modified the first programm (I added a loop) and it's working good now. I have another question to users of Agilent E4980A. I don't know which is the best averaging factor for my experiment and I can't find nothing about it in User's guide exept that we can specify it within the range of 1 to 256 in steps of 1.