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| Keysight 3000T scope 1 GHz(or more) hardware upgrade mod |
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| Netroman:
I've just completed my mod (MSOX3024T now 1GHz) and it works great - many thanks to all envolved users from this Forum; especially Steve for additional hints and support. If someone needs contacts, i got plenty of offers for the teledyne relays. Most where between ~40-59 US (i bought mine much too expensive and they are not very hard to get |O). For the really tiny parts i used a JBC NASE nano rework station - not cheap, but definitive worth the money. I did not believe that, but i'll never buy another brand anymore. I had some problems with the user calibration, but the reasons were just wrong ordered parts. Especially the Driver "74ACT04" - MUST be an "ACT", because it is driven by Levels about 2.4 Volts and Needs to be able to work with TTL-Levels. So the "ACT" is absolute must (i had a "HCT" which has much too low power, whilst the ACT delivers up to 25 mA). And i made absolute equal length cables for the calibration with 250mm (important: not longer than 300mm per cable), also bought hight quality tee-connectors bnc. Though i was successful in reusing the desoldered cheaper relays, i would also suggest to buy new ones, because these should work for years without Troubles. I replaced the two ones in channel 1 whilst finding out my calibration problems. Best regards from Austria, Josef |
| EE-digger:
Thanks for your report ! Now I'm stoked again to perform the mod. I had a thought on clean shield removal. What do you guys think about heating a single corner, sliding a piece of Kapton film under it, then on to the next 'til done? Re-soldering should be a piece of cake but I might use NC paste to keep it neat. Also, 74ACT is almost twice as fast as 74HCT. Is this the cal signal? The 74HCT rise time may have been inadequate. |
| TheSteve:
--- Quote from: EE-digger on June 02, 2018, 01:01:30 am ---Thanks for your report ! Now I'm stoked again to perform the mod. I had a thought on clean shield removal. What do you guys think about heating a single corner, sliding a piece of Kapton film under it, then on to the next 'til done? Re-soldering should be a piece of cake but I might use NC paste to keep it neat. Also, 74ACT is almost twice as fast as 74HCT. Is this the cal signal? The 74HCT rise time may have been inadequate. --- End quote --- Removing the shields isn't actually too bad. You can just lift them up corner by corner. The 74ACT04 drives the FET's that turn the Teledyne attenuator relays on and off. |
| EE-digger:
There must be some other loading on the '04 output then, that does not permit the HC04 to satisfy the Vgs. |
| Netroman:
@EE-digger: I broke a small piece of GND-route, because the shields do not really bend well. I suggest to spend some solder wick to remove as much as possible before you lift the corners. IMHO the corners do not lift (bend) more then 1/2 to 1 mm - that was not enough (too much solder on it and at first i did not use wick) in one case, so i ripped the route :-( Josef |
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