maximum speed using GPIB only and E3643A

[dentarthurdent]

Hi

I am using Labview 8 to control an E3643A power supply. The link is

via GPIB using the NI USB-GPIB converter. I have written a simple

application which is an infinite loop that swtiches the supply between

0V and 10V. My objective was to see how fast the system would run.

When I look at the power supply output on a scope I see that the

voltage changes every 50msec. The PC is not doing anything else.

I use VISA for the comms. Does this seem reasonable? Should I see

the voltage switching faster? I tried changing different things : for

loop , while loop , GPIB write , etc but nothing changed the basic

switching time of 50msec.

Thanks.

Paddy.

[Dennis_Knutson]

That's well under the maximum settling time that is in the specs. Were you expecting something else?

[Albert.Geven]

As Dennis said. this is expected. 50ms is fast for a powersupply via gpib. Gpib is faster, most instruments communicate in the 10ms range.

And windows is adding jitter to that. I you need fast IO I would use a multifunction IOcard for IO.

1 us is then easily achieved.

[dentarthurdent]

Thanks for the replies. There is no nothing so

easy to miss as the glaringly obvious.