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| HP 5335A Timer / Counter - Anything i should know? |
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| PE1RKI:
mine also came with the papst rated 18 to 30 volt. most ic date codes are 1989. i got it from a danish company going bust for cheap. but is has no 1300mhz option and no oven :( and thanks so much for the capacitor hint!!!!! :-+ i modded mine immediately |
| Dr. Frank:
--- Quote from: Orange on May 26, 2014, 06:29:16 pm ---OK, so I changed the EPROMS from V1.0 to V1.1. Initially done some tests on Channel A and B, and all seems fine... Later today I checked Channel C :palm: With a 100MHz signal it displays 320MHz !, 1200MHZ gives 3840MHz on the display ! I presume that the later units have a different division factor for the Channel C board which is compatible with V1.1 I could not find this in the documentation. So its back to V1.0 :( --- End quote --- Hi Oranje, after reviewing all the pictures posted here, I think that max_torque has got the right combination of EPROMs for you. The 05335-80006 for the elder by-20 scaler, and the 05335-80007 as in my unit. If his unit displays the decimal point, then it should be the updated V1.1 also, especially as his unit is 2626A. Perhaps he may read the content of both EPROMs for you and you'd give that try. Frank |
| Orange:
Well that's certainly worth a try. I find it peculiar that HP never mentioned something about it. It's also a thing to remember if you want to upgrade your counter with a Channel C board. |
| Dr. Frank:
--- Quote from: Orange on May 27, 2014, 12:21:14 pm ---Well that's certainly worth a try. I find it peculiar that HP never mentioned something about it. It's also a thing to remember if you want to upgrade your counter with a Channel C board. --- End quote --- Hm, I got that latest manual ...90044, which really covers EVERYTHING. The manual changes are described in reverse order, and very complicated to read. The different schematics stages are missing, so you have to imagine these. As I got a (very good) copy only, I don't know, how the original manual looks like. But anyhow, I think the status is clear now. Would be interesting, if you get the content and succeed to update correctly. V1.0 has really many annoying GPIB related and function bugs. Good luck. Frank |
| max_torque:
This is turning into quite an interesting thread! ;-) Yes, my unit is V1.1 and displays decimal point on boot. I'll try and upload the proms when i get a second :-+ I think i will install the fan mod too. Mine is running from the DC bus, but boy is it noisy! It's like someone doing the hoovering in the room :-// Also, i notice the GPIB board "A7" is completely seperate from the logic board "A4" and consists of a GPIB driver, driven by some parallel data lines for address and data etc. A nice little project would be to replace this pcb with a modern microcontroller with a direct USB output, to a USB socket on the front panel (probably on the right hand side) That would neatly avoid all the messing around with GPIB->USB convertors etc! If i find the time i might scope out some of the signals, however, assuming the driver IC on A7 is "dumb" then we should have TTL level GPIB protocol on the A7xA4 connector???? |
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