| Electronics > Repair |
| Fluke PM6666 counter freezing after 3 seconds from turning on. |
| << < (9/27) > >> |
| FransW:
I will try to scan the I2C-bus pages tomorrow. From the GPIB parts lists not much can be deducted. They appear nearly exactly the same with minor variations. Did you check the com port dataflow to your PC? Is there data flow? I can not check any GPIB irregularities since mine does not have that unit. There seems to be something blocking the counter functionality when the unit is installed. Waiting for ??? (unknown command). Since working with a GPIB unit is fairly common with the PM66xx counter/timers I would not expect something like this would happen, given careful consideration setting the command address switches. Can you monitor the data exchange with your scope? Bedtime now, 01:00 hrs here locally. Regards, Frans Scanning tomorrow. I will try to OCR these pages, given enough time. |
| pizzigri:
OK thank you. I just trashed my SALEAE clone, it just died on me so I have now doubts on whatever i was looking at. I purchased another locally at double the cost (10 Euro) but at least it should arrive tomorrow, hopefully it's going to be better to check the I2C bus. I really appreciate your help and the manual excerpts! Best, Franco |
| FransW:
I2C, 3 pages. Rest to follow. |
| FransW:
Pages 27, 28 and 29 |
| pizzigri:
So I have been checking the I2C bus with the logic analyzer. I probed the SDA and SCL lines, using the rear diagnostic connector, see photo. I am baffled, I can see that the bus at one point basically crashes but I cant understand why. The Saleae sw I am using shows me an interpretation of the I2C bus but I cannot correlate it to what I read in the manual excerpts, surely I am lacking in knowledge of the bus (dont know crap about it) but surely enough it has nothing to do with the little I do know about it from i.e. arduino. That something wrong is going on I can tell by the last signals recoded when the machine crashes and locks up, all lines go down and they are supposed to stay up. See images and XLS files, the one with the crash is labeled "withgpib". Can someone help me with this? Pleease! |O ETA: Image 3 is of the counter WITHOUT GPIB card connected, and 4 and 5 are WITH the card, up to the point immediately before crashing. |
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