| Electronics > Repair |
| Fluke PM6666 counter freezing after 3 seconds from turning on. |
| (1/27) > >> |
| pizzigri:
Ok, so I just received this counter from an Ebay seller. It looks brand new and has options pm9604 (gpib) and pm9607 (vtcxo). I connect it to mains and turn it on: it checks the display, passes whatever test it does at power-on, and works for three seconds. Then it freezes completely, with what ever option or command I managed to input in those three seconds. I tried connecting a function generator to an input, sending a 10mhz signal, and the counter actually works, for three seconds.... then it freezes up with the frequency displayed on the screen. Using 0.2s measuring time it samples the frequency until it freezes again. Does not matter if it starts from cold or after twenty minutes of being powered up.... i looked at it with a thermal camera and some chips do seem to run quite hot (around 50 C) but it should not be a problem. Can anyone help me? PS: it seems the previous owner replaced the mains filter - that shows a trend of exploding- with a standard IEC socket and standard fuse. |
| Haenk:
My 6666 manual mentions a "local lock-out" function (GPIB only?) and a "display hold" function. Not that I ever use those, but one of those might be the issue? Here: http://na.support.keysight.com/pna/help/latest/Programming/GP-IB_Command_Finder/Local_Lockout.htm Another thing I found is a service status request, which the counter sends out to attached GPIB units and requires a feedback (but gets none) - I'm sure some GPIB expert might help there... |
| pizzigri:
Thanks for the help, but it still freezes.... the command should lock out everything except the local key and that locks as well. Actually, even when locked out the display should show frequency of the DUT, instead it freezes as well, I just programed a sweep to test this..... It’s driving me crazy |
| pizzigri:
However, you ARE onto something! I pulled out the GPIB board, and the PM6666 is not freezing any more. Either it’s a broken option board or something to do with it.... I have never used it in my HP34401A, so I sincerely do not know anything about the interface. How can I troubleshoot the GPIB? I was indeed planning to use it. At least I know the counter works! |
| Haenk:
Funny enough, the german and english manual differ in the "local" mode. The german manual states (translated) "If the counter is commanded via GPIB, it is possible to deactivate the LOCAL key by a command." Of course this command is nowhere mentioned. And this part is missing from the english manual (however that's the first edition, compared to third edition on the german one...). |
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