I am having problems with labview and a Keithly 6517A

[Mechi2323]

I have labview 6.1 and I have been fixing an old program to test for TSC (Thermally Stimulated Current) it was working beautifully on tuesday but today it does not work. The problem is with the Keithley 6517A the display gets stuck on dashed lines, as if it were trying to take a measurment and in the program it is at the place where it should in deed take a measurment. But it does not actually get past that point, it just sits there and I hear a clicking noise over and over from the 6517A. I have never altered any drivers from the original program or anything to do with the aquiring data part only things before that. I am frustrated because I have no idea what to do. The Instrument seams to work up until I run th
e program (there is an error message when the 6517A is turned on that says error id code: 510)

[Dennis_Knutson]

First thing you should do is open the instrument manual and find out what error 510 is. I went to Keithley's web page and found out that 510 is "Reading buffer data lost". It's seems likely that the instrument has a buffer that keeps that last x number of readings and once the buffer is full, no more readings are possible. You might want to check with Keithley on this and see if there is a function in the driver to purge the buffer and how to avoid the problem in the future.