| Electronics > Repair |
| Fluke PM6666 counter freezing after 3 seconds from turning on. |
| << < (24/27) > >> |
| 0xdeadbeef:
Did some quick measurements. Currently, the counter stops reacting to key presses after ~3s about every 2nd start. So I did a measurement while frozen and while running. They look the same to me though. I didn't invest any time to get rid off environmental crosstalk, but the measurements were made with a low capacitance active differential probe and a scope with ~750MHz bandwidth. [EDIT] The frequency measurement at the bottom of the screen is using the rising edge (no way to change that AFAIK). The falling edge frequency is pretty stable though if you look at the upper (trigger) frequency. |
| thinkfat:
Thanks. If your IC105 is socketed, could you pull it out (carefully) and measure again? The counter will not boot (IC105 is the main CPU) but I'd like to see if that changes anything about the waveform. PS: if you have a GPIB option, maybe pull it as well and try if the reliability improves? |
| 0xdeadbeef:
Not today or tomorrow. But I'm not convinced that this signal is the root cause anyway. |
| shakalnokturn:
@0xdeadbeef: Does your counter also have the VTCXO option? @pizzigri: Did your sold PM6669 have the VTCXO or not? |
| 0xdeadbeef:
I'm not at home right now, but I have that TCXO thing that can be calibrated by pushing some internal button when an external 10MHz reference is connected. Wasn't this called MTCXO? |
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