Real time voltage measurement from Keithley 2400 Sourcemeter. How to increase chart update rate?

[jsp6]

Hello,

I'm trying to view the voltage measurements in real-time chart. (Labview2012 and I've connected 2400 sourcemeter with my laptop by using GPIB-USB-HS)

My question is, how can I increase the chart update rate? Say, how can I increase samples/second rate?

Here is the screenshot of my chart -> . Its update rate is quite slow and I dont know why the voltage measurement takes time to settle back 0V (notice the descending slop after the voltage pulse).

I'm using labview to measure a voltage pulses. So I need fast-response chart that looks like this -> .

I'm very new to Labview. Please help 

I'm attaching the vi

[_Bryan]

I am not able to look at your VI's right now.  But I had to communicate with a Keithley 2000 yesterday over RS232 and I ended up using the fetch command instead of the read command.  I ended up reading a few posts on the forum that recommended doing that.

[billko]

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@jsp6 wrote:

Hello,

I'm trying to view the voltage measurements in real-time chart. (Labview2012 and I've connected 2400 sourcemeter with my laptop by using GPIB-USB-HS)

My question is, how can I increase the chart update rate? Say, how can I increase samples/second rate?

Here is the screenshot of my chart -> . Its update rate is quite slow and I dont know why the voltage measurement takes time to settle back 0V (notice the descending slop after the voltage pulse).

I'm using labview to measure a voltage pulses. So I need fast-response chart that looks like this -> .

I'm very new to Labview. Please help 

I'm attaching the vi

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Are you sure they're the same timescale?  The LabVIEW shot sure looks like a time-stretched version of the display photo...

[jsp6]

Hi,

I replaced "Read" to "Fetch" command as shown below; 

  --> 

But, I'm not sure if I placed it correctly since I'm very new to Labview. 

Although I'm using "Fetch" command now, I can't feel any speed increase in the chard update rate..

[billko]

As I mentioned yesterday... are you sure the timescale is the same?  Your plots sure look similar, with your LabVIEW plot being a much smaller slice of time.