Re: HP8594E : What is really needed when lost of cal data with dead battery?
Hi Nicolas,
I can report from my calibration experience with an HP8593E. I assume there is no big difference in procedures to your HP8594E.
I purchased a used HP8593E to find that is was only calibrated to 18GHz. For the frequency range 18...27GHz there were no correction coefficients, so level readings were way off.
Calibration required a stable generator for the frequency range in question, a high quality splitter and an accurate power meter. You have to take a level measurement with the SA at every single correction grid frequency (there are many!) and write it down. You find those lists in the manual.
Then you have to enter all those numbers point by point into the instrument. I used the front panel keys to do that.
This may be automated via GPIB, but you still need to get the numbers into a computer.
It was very tedious and I refrained from re-calibrating the range below 18GHz. I do not ever want to do this again.
That's why in the same pass I replaced the CMOS memory battery. Now, I should be safe for another 10 years.
Best regards,
Tom
|
Re: My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge?
Sorry:
maurinot (AT) libero (DOT) it?
|
Re: My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge?
Hi Stan,
as Phil says, if Keysight does not guarantee you will need to do it yourself, you will need a LAN card for your DSOX2024.
If you want, I still have some LAN cards available.
You can see them on eBay by searching for:? "Agilent Keysight DSOXLAN Card MSOX DSOX 2000 3000 InfiniiVision Oscilloscope"
Otherwise with, a little discount (45Eu. + Sp.), send me a PM to maurinot (AT) libero (DOT)?
Have a good day.
maurizio - Italy
|
Re: HP8594E : What is really needed when lost of cal data with dead battery?
I Think I found the right section in the manual :
Reloading the Correction Constants
This procedure assumes that you have valid correction constant data
from a previous backup. Without backup data, new correction constants
must be generated by performing the adjustments in Chapter 2.
|
I have a good scanning setup, I can scan without disassembling books. If anyone has a copy I will be happy to scan it for all to use.
|
HP8594E : What is really needed when lost of cal data with dead battery?
I read everywhere that loosing the CAL data when the battery dies is like planning a ride through hell but nobody actually demonstrated what is involved when such thing happens.?
while troubleshooting my S.A, I did a DEFAULT CAL recall and it recalibrated itself fine after.
I even read the manual and it explains in details what to do and srite down measurements compensation. I did not read however how those manual readings are then set into the instrument¡¯s memory. ??
Does someone knows why is everyone afraid so much about the battery and the involved procedure?
|
All those plugins alse have HW difference so they can be identified and fixed/restored even with empty eeprom by mainframe unit. I spent quite lot of time o this. Would be nice to have trigger only plugin to track the HW difference/ idenrification section. Amplifier plugin seams to be to complex for that, especialy that there is not so much informatins about communication. Maybe plugins for 54750 would help also, as Mike mentoined before, they have thos selection swiches, which are responsible for HW identification, also they are a bit better documented.??
Best Regards Arkadiusz Gibes
W wtorek, 8 lutego 2022, 16:15:42 CET, Ovidiu Popa [Business] <ovidiu.popa@...> napisa?(-a):
An EEPROM dump would be a great asset, saving much grief in people that lost the 54720 mainframe calibration due to a stinkin' dead battery. The 54717 "calibrator" hardware is just a brain dead pair of coax cables and a limiter (which can be omitted, anyway).
|
Re: My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge?
This is a well-known NAND flash corruption issue. ? Call Keysight and ask for a free fix, if they don¡¯t do it then report back. ? Read this if you want to do it yourself: ? ? ? ? ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Stan
Sent: Tuesday, February 08, 2022 10:35 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge? ? My MSOX2024A had been sitting on a shelf for several months without being powered up. This weekend when I powered it up for the first time, it would not boot up and froze with just the REF and MATH LEDs illuminated. Power cycling it (as had been suggested in another post) did nothing to resolve the problem. I had the same thing happen with another MSOX scope a few years ago and Keysight repaired it at no charge. Does anyone know if they still honoring that "extended warranty?"
Thanks,
Stan
|
Re: 8594E input attenuator issue?
Can¡¯t help you with the screw, maybe a attenuator mounting screw if the unit assembled right.
Highly recommend you replace the battery asap. A new battery in place doing it¡¯s job should read greater than 3.6v, many around 3.63 to 3.65v?
a Lithium Thionyl battery at 3.1V is considered near end of life if it more then 10-15 years old.
the replacement is a easy process. Loss of cal data is a hard process to set right again.
good luck.
Gerald
VK3GJM
|
Re: My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge?
You can call their customer contact center and ask. Worst thing that happens is they say no. Best thing is they say yes. Intermediate thing is they quote a reasonable price to fix it which will [probably include a fresh cal. Or may an unreasonable price, but that is your judgement call. ? Or , they might just tell you how to fix it yourself. ? The phone number is on their web website. ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Stan
Sent: Tuesday, February 08, 2022 10:35 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge?? My MSOX2024A had been sitting on a shelf for several months without being powered up. This weekend when I powered it up for the first time, it would not boot up and froze with just the REF and MATH LEDs illuminated. Power cycling it (as had been suggested in another post) did nothing to resolve the problem. I had the same thing happen with another MSOX scope a few years ago and Keysight repaired it at no charge. Does anyone know if they still honoring that "extended warranty?"
Thanks,
Stan
|
My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge?
My MSOX2024A had been sitting on a shelf for several months without being powered up. This weekend when I powered it up for the first time, it would not boot up and froze with just the REF and MATH LEDs illuminated. Power cycling it (as had been suggested in another post) did nothing to resolve the problem. I had the same thing happen with another MSOX scope a few years ago and Keysight repaired it at no charge. Does anyone know if they still honoring that "extended warranty?"
Thanks,
Stan
|
Re: 8594E input attenuator issue?
I would like to thank the group. My HP 8594E is now working correctly. I basically cleaned the attenuator inside contacts with deoxit then checked the attenuator by itself on a bench using a simple bread-board setup to actuate each solenoids. After it tested good, I put it back into the analyzer, ran the calibration and it passed without errors!
I have two easy questions:
1: I still have 1 long slim philips screw left. Can¡¯t remember where it goes. Anyone knows?
2: the current CR2477 battery reads 3.0v. What¡¯s the threshold where it can¡¯t keep the ram from loosing its data?
|
Re: 5383a counter-Need 7seg decoder IC (HP 1820-0914)
The 7448 is "likely" to work fine, given the circuit you showed in the first post.
Install a socket, and try it. Worst case, you have to plug something else in.
Pete
|
Re: 5383a counter-Need 7seg decoder IC (HP 1820-0914)
Hi Greg, Thanks for the datasheets and Jameco information.? From your mention of the 9307 using active pull-up, I searched for more details on this.? While looking thru the Jameco 7447/7448 Family data sheets, I noticed the 7448 is shown as Active High and its description actually mentions internal 2Kohm pullup resistors to drive a buffer transistor for the display segment. I measured out of circuit resistance on the old 9307 chip between segment output pins to VCC pin and it was around 1.6K for all segment pins.? I'm assuming this would be a rough measure of the 9307's internal pull up for comparison. Here's a screenshot of the Jameco datasheet showing the 7447 & 7448 segment output. Since the 74LS48's are available, thinking about ordering a couple of these and maybe try them on the breadboard first.? Would there be any interface concerns with using a 74LS48 vs the 7448 with the other older TTL chips in the counter? Thanks again! 
|
Re: 5383a counter-Need 7seg decoder IC (HP 1820-0914)
DB,
?
My last message was rather haphazardly written and didn¡¯t include as much information as I had intended.? It was after midnight and I was trying to get some sleep before a 5:00 rise.
?
Looking at the schematic you provided it is obvious that any part substitution will either require a device with an active pullup or you will have to provide same with external resistors if it has open collector outputs.?
?
I looked at the 7447/74LS47 and the pinout is again the same as the 9307 but has open collector outputs same as the 74LS 247 previously mentioned.
?
From all of this I suspect that you have a few options to consider as well as other decoder/driers out there that may also serve the purpose and are still readily available.
?
Greg
|
An EEPROM dump would be a great asset, saving much grief in people that lost the 54720 mainframe calibration due to a stinkin' dead battery. The 54717 "calibrator" hardware is just a brain dead pair of coax cables and a limiter (which can be omitted, anyway).
|
I looked for one a couple years ago with no success. They exist in printed form but it appears noone has scanned one yet.
|
Re: 8350B *restoration adventure?*
Hi again
On electric/electronic tests:
I've changed three 2N2222 transistors on A6 rectifier board, one mising (due to transformer hit I presume), one leg broken and one corroded. Diode drops, fuse continuity and caps leakage test done too.
Due to lack of information about real current consumption and since my plan is to convert (and in some way, redesign) the power supply, I managed to do the same thing I did on my 8663A restoration a year ago: fantastic and colored 1.5 mm2 (16 awg) wiring to feed the rails using power supplies and transformers. For better and safer current monitoring conections, I opted to use banana 4mm plug set.
I fed the 5 volt rail (with 11.8V) yesterday, and with 2.3A drawing, the logic circuitry looks working fine (error display, knobs working, keys responding). It's a first step, I know. But the 19 amps I estimated for this rail seeing the fuses ratings is far away. After this first attempt, I thought how wrong my estimation was: how could it draw 19 amps with five logic boards (plus plugin)?if the biggest and way more populated 8663a draws 10-12 amps in that rail?. Doing the power conversion,?it makes more sense to think that the current in 8350B is about 5.4 amps @ 5 volts, which makes more sense seeing the actual hardware installed. I never stop learning ^^
The voltage regulation is made using LM317 and LM337 mostly, so the input voltage could be a lot higher than outputs, that reduces the secondary wire gauge on the transformer for developing the same power. That's the reason, I think, for the monster heatsink used in the 8350B, which has the size and weight of a brick.
Still thinking how to adapt the 8566B transformer to this unit, with one less secondary and only one center-tapped. A bit challenging, but I think it is possible.
Regards,
Ruben
|
Re: 8350B *restoration adventure?*
My unit has a ton dust and some white and green powder coming out, as you can see in my photos. Nasty but no fatal, only surfaces afected. So, after all, this little fella was lucky.
Tony,?definitely your unit was exposed longer to the corrosive elements. Luckily my unit doesn't seem to have contacts or wires corroded. I sand the edge conector on HP-IB and A7 regulator board pcb,?but they had any severe corrosion, just tarn a bit. Gold plating doing a good job there. I think this particular unit suffers a leaky Ni-Cd battery pack in the past, someone replace it (but no clean the unit) and the major corrosion stops there, because current battery pack looks leaky but not too much (anyway I get rid of it, and think on use a Ni-Mh, like I did on my 8663A).
|
Re: 8350B *restoration adventure?*
Hi Ruben,
Looks like you are doing a great job of bringing it back to life. I can sympathise because I went through more or less the same process a few months ago. I think my 8350B might have been stored at the same place as yours :-) It had bad motherboard corrosion - especially in the edge connectors. I treated it with white spirit vinegar and then lots of distilled water followed by a gentle "bake" in the fan oven at about 45.C with the door slightly open to completely dry it out. That caused domestic strife!.? The biggest problem was the power and data connectors to the plugin as the ribbon cables had corroded through and many of the wires were floating about. I ended up having to make completely new ribbon cables. I've added a couple of pics - they look like yours!
Good luck and looking forward to seeing your progress on getting it working.
regards
Tony
|
maurit
saipan59 (Pete)
Precaud
RubenRubio
