KEITHLEY 238/ NI GPIB-USB-HS- change time delay

[poli]

hello

I have a keithley 238 meter that measures current  as the voltage is swept. It is  GPIB device and hooked up to my PC through NI GPIB-USB-HS

adaptor. I want to control it using Labview 8.6. I used the VI available at your instrument driver network, which directed me to keithley website and is attached below.Keithley says the VI is an unsupported  freeware. The VI is located at

 http://www.keithley.com/products/currentvoltage/?path=238/Downloads#1

 The first "example program"  in this website is the VI that i am using.

Now the VI is working nicely.  The VI sweeps the voltage and displays measured current as a table and a graph.

I just want to modify the sweep  delay, but i cannot increase it beyond 1000ms. Why is it so?

The sweep delay is the time it pauses after each increment of voltage.

I dont know whether a modification in the VI is needed or settings of the NI GPIB-USB-HS adaptor are a problem. I checked the settings of this device under MAX-  the time related settings are as follows

1) I/O timeout-> by default set to 13(10sec)

2)Antipolling- checked

3)then there are some termination settings and advanced settings, there is a setting, bus timing set at - 2(500nsec)

So are the GPIB  settings wrong or code must be changed? How and where to change the code?

[Dennis_Knutson · Accepted solution]

The reason that the VI will not allow to set a value greater than 1000 is simple to understand. Just right click and select Data Entry and you will see that the maximum is set to 1000. Why it's set to that I don't know. Have you looked in the manual to see if 1 sec is a limitation of the instrument?

[poli]

thanks!

the problem is solved.