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| Upgrading Counter 53220A to Option 010 Ultra High-stability OCXO Timebase? |
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| Dr. Frank:
HighVoltage, that's very interesting.. could you please also provide the dimensions of this OCXO, the pinning, and the output waveform (square wave or sine)? I think, VECTRON offers OCXOs with standard pinning, which might fit, but with customized specifications for KS. Maybe something like their OX-208: https://www.vectron.com/products/ocxo/OX-208.pdf Frank |
| carl_lab:
Thank you very much! Now I can try to get those (U)OCXOs as spare parts. 1900+ euro (as offered by Keysight distributor) for changing one of these seem to be a bit over the top... I don't know which jerk ordered counters without OCXO for clock adjustment... |O What I know, those counters replaced out-dated 53131 opt. 010. The specs of 53220A (without option) is inbetween 53131 without option and 54131 opt. 010. I'm not sure about warranty. The counters maybe out in the meantime... I also don't know, if warranty stickers are attached. Most gear I see here in the lab is without stickers... |
| carl_lab:
--- Quote from: Dr. Frank on November 19, 2016, 01:23:15 pm ---HighVoltage, that's very interesting.. could you please also provide the dimensions of this OCXO, the pinning, and the output waveform (square wave or sine)? --- End quote --- Pinning is 19x19mm, case dimensions 1"x1" (Vectron C4550A2). -> www.vectron.com/products/ocxo/C4550.pdf The grey plasic cap seems to be the same, that is used with standard oscillator. |
| HighVoltage:
--- Quote from: carl_lab on November 19, 2016, 02:18:59 pm --- I don't know which jerk ordered counters without OCXO for clock adjustment... |O What I know, those counters replaced out-dated 54131 opt. 010. The specs of 53220A (without option) is inbetween 54131 without option and 54131 opt. 010. --- End quote --- You mean 53131? The 53131 without opt 010 was as bad as the 53220A without option 010 After a few month of being off, I turned my HP GPS Time Domain on again today. Here are my three counters after a few hours of warmup and GPS-Lock on the HP Z3805A. The 53132A was upgraded by me here: https://www.eevblog.com/forum/repair/agilent-53132a-repair-(and-possible-upgrade)/msg843138/#msg843138 This one is right on target in the shortest possible time. Every single time I turn it on, it is fluctuating only the last 2 digits The 53230A with all options was the one I opened in this thread This one takes much longer to warmup than the 53132A to be stable after a cold start But after one hour it has a stability about the same as the 53132A The 53220A is without Option 010 and is horrible in comparison After every cold start it finds a different spot where it settles Interestingly, this one was just repaired and calibrated at Keysight Germany in (warranty) but is far off. Why having 15 digits, when the last 6 have no meaning? |
| carl_lab:
--- Quote from: HighVoltage on November 19, 2016, 03:00:11 pm ---The 53220A is without Option 010 and is horrible in comparison After every cold start it finds a different spot where it settles Interestingly, this one was just repaired and calibrated at Keysight Germany in (warranty) but is far off. Why having 15 digits, when the last 6 have no meaning? --- End quote --- 7 digits, not 6. ;) --- Quote from: HighVoltage on November 19, 2016, 03:00:11 pm ---You mean 53131? --- End quote --- Yes, exactly: 53131A. Bad combination: Laptop keyboard and my "wurstfingers"... |
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