| Electronics > Repair |
| Fluke PM6666 counter freezing after 3 seconds from turning on. |
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| khs:
I would be interesting to see I²C clock/data and the option signal (BU102) together - from your working counter and from your not working counter. Additional you may check the I²C data signal with an oscilloscope and compare the voltages to to your 'working' counter. There are two pullups for I²C clock / data: R147/R148. You may check the values and solder points. Again just my 2 cents.. |
| pizzigri:
KHS, this evening I'll try to check it out. I do have a DSO, I'll connect it this evening and also the logic analizer and see what comes out! Thanks for the heads up. |
| pizzigri:
So I checked the pullup resistors they are basically almost spot on at 1.48K (both of them) however I'm measuring in circuit. Iterrupts, I treid with the Saleae logic analizer, there's absolutely no traffic that I can see in the Option line, unless I am mistaken. And also, I have to rectify a statement: it is true that there's always unreg power to the GPIB connectr, however the gnd ref is controlled by the main switch so the board does get powered on when the power switch is pressed. However, and I did test this, using one of the two GND lines and unreg +V, it is possible to keep something always on inside the meter - i.e. an OCXO osc, that then is always ready when the whole meter is turned on. I am struggling with the brand new Siglent SDS1202X-E, which does have I2C decoding and a lot of other things but I have to learn that too! Uff. I could not see the signal levels yet. However, as I said, no traffic on OPTION interrupt.Surely I'm doing somethng wrong? It HAS to have some traffic. |
| coromonadalix:
is there a configuration pin, something who tells there is an gpib card installed ?? id pin ? an tensy wheeny little thing ? something so stupid to make it work in this 6666 ?? I havent seen the schematic, was it posted ? |
| khs:
--- Quote from: pizzigri on October 09, 2020, 04:02:49 pm ---However, as I said, no traffic on OPTION interrupt.Surely I'm doing somethng wrong? It HAS to have some traffic. --- End quote --- If there is no traffic I would take my next two cents and: 1) Make an adapter to connect pin by pin from the mainboard to the GPIB board. 2) Isolate all connections - and check the counter. - the counter should run. 3) Connect GND and check the counter. 4) Conenct the positive power supply and check the counter. If there is a problem check the power supply. 5) Connect I²C clock and check the counter. The counter should work. 6) connect I²C Data and check the counter. 7) connect OPTION and check the counter. Then maybe we know more.. |
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