I have a weird one. In my test program I have a spectrum magnitude vs. phase (polar) object that executes repeatedly, each time with fresh data from the instrumentation. So the operator can see what's going on while they twiddle with the device under test.
They noticed that the loop time was increasing very gradually as they continued to test for a long time. I checked it out and found that yes indeed they were right - by a sub-sub-millisecond value that you didn't notice until tons and tons of iterations.
I found the cause but not the reason. The "clear at activate" option on my plot object was not checked. I did that ages ago when I first developed the software, to get rid of a flickery appearance. I checked "clear at activate", and the problem went away. (But I couldn't really go with that as a solution because of the flicker, so I changed it so that a clear control input pin gets pinged if the operator hits any confirm ok button on the panel).
Problem solved but I want to know what's going on. Try as I might I can't get this to repeat in a small example program. If I do I will post it. Anyone else noticed anything like this? What did you do to solve it? And what does "clear" actually do anyway?
Thanks
Warren
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Hi All. Using an HP6654 power supply I was able to measure the current drawn by a board directly from the supply. However, the design of the board has changed and the current drawn is "chopped" in to blocks at a frequency of 200Hz. [i.e max ON time 5ms] I have tried various ways of obtaining the current measurement and although I am aware that there are fairly straightforward hardware ways of overcoming this issue, I prefer to use the software route. Anybody had a similar experience and can shed some light on this?
Best regards Dave Bielawski Test Development Engineer Raymarine ...world leaders in marine electronics Tel : 44 (0)23 9269 3611 (1043) Fax : 44 (0)23 9269 4642 e-mail : david.bielawski@raymarine.comwww.raymarine.com The information in this e-mail is confidential and is intended solely for the addressee. Access, copying or re-use of information contained in it by anyone else is unauthorised
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I have a weird one. In my test program I have a spectrum magnitude vs.
phase (polar) object that executes repeatedly, each time with fresh data
from the instrumentation. So the operator can see what's going on while
they twiddle with the device under test.
They noticed that the loop time was increasing very gradually as they
continued to test for a long time. I checked it out and found that yes
indeed they were right - by a sub-sub-millisecond value that you didn't
notice until tons and tons of iterations.
I found the cause but not the reason. The "clear at activate" option on my
plot object was not checked. I did that ages ago when I first developed the
software, to get rid of a flickery appearance. I checked "clear at
activate", and the problem went away. (But I couldn't really go with that
as a solution because of the flicker, so I changed it so that a clear
control input pin gets pinged if the operator hits any confirm ok button on
the panel).
Problem solved but I want to know what's going on. Try as I might I can't
get this to repeat in a small example program. If I do I will post it.
Anyone else noticed anything like this? What did you do to solve it? And
what does "clear" actually do anyway?
Thanks
Warren
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