I¡¯ll throw my hat in the ring and also suggest a 54504A CLIP if anyone has it available.? I have the service manual that is basically oriented towards use by chimpanzees to do go-no-go testing during a failure.
?
It¡¯s a shame that around this time HP was starting to ¡°dumb down¡± their product documentation.? Aside from paying less people to do technical documentation (to some extent) I do understand the profit motive to push assembly level replacement instead of repair but the end user also faces a considerable increase in trying to keep their equipment alive.
?
?
Thanks,
?
Greg
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Re: HP 8753D Connection Adapters?
James, the connector is called APC-7. I recommend looking for for APC-7 to N or SMA adapters.
Best regards
Marcus
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HP 8753D Connection Adapters?
Hi, Can anyone recommend where I can get hold of 2 Connection Adapters for either N-Type, BNC, or even PL259 preferably in the UK, Cannot find what the model numbers are, so any help would be really useful as not sure what the connections are called that are fitted to this unit.
Kind Regards
James
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Hi the only info I Have on the HP 1858-0015 equivalent? A160-0100? IC Digital Alternatively look at the File,s on this site in A HP Agilent Keysight Parts index and x reference ? Regards Paul B
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From: [email protected] [mailto:[email protected]] On Behalf Of Istvan Kovacs
Sent: 06 February 2022 10:06
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP 1858-0015 ? Hello,
my first message to this group.
I'm looking for a cross-reference for an HP 1858-0015. It consists of two differentially connected NPN transistor pairs in DIP-16. It is used in limiter circuit between a local oscillator and a double balanced mixer in my HP 3586B Selective Level Meter.
I've found two sellers on eBay but I'm trying to find a cheaper/local source.
Thanks,
Istvan
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Hello,
my first message to this group.
I'm looking for a cross-reference for an HP 1858-0015. It consists of two differentially connected NPN transistor pairs in DIP-16. It is used in limiter circuit between a local oscillator and a double balanced mixer in my HP 3586B Selective Level Meter.
I've found two sellers on eBay but I'm trying to find a cheaper/local source.
Thanks,
Istvan
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Hi we currently have the HP 54503A Service Manual? NO CCt? Jul 1989 .pdf? in the file section on this site ? Could I ask if anyone has the circuit diagrams / CLIP could they please up load to the Files ? On the same line if any one has any CLIPS for any Equipment in PDF format that are not from ARTEK ?could I ask that they please upload them to The CLIPS folder on this site ? Regards Paul B ?
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From: [email protected] [mailto:[email protected]] On Behalf Of sv1aku via groups.io
Sent: 31 January 2022 19:22
To: [email protected]; [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 54503A? see attached PSU schematic I got from a guy back in 2009 when I was trying to repair my HP 54501. I also have the 54501 schematic in PDF ( from 90903 service manual supplement)? if anybody ever? needs it. ¦²¦Ó¦É? ¦¤¦Å¦Ô¦Ó?¦Ñ¦Á 31 ¦©¦Á¦Í¦Ï¦Ô¦Á¦Ñ?¦Ï¦Ô 2022, 07:28:12 ¦Ì.¦Ì. EET, ¦Ï ¦Ö¦Ñ?¦Ò¦Ó¦Ç? N5ZTW via groups.io <n5ztw@...> ?¦Ã¦Ñ¦Á¦×¦Å: Howdy friends, I have a pair of 54503A scopes. Both had the dreaded Dallas semi Battery ram chip go bad.
I purchased a new Dallas unit and pulled the bad installed a socket and the new unit. Now The system will not boot I have garbage on the screen.
Pretty sure I must have broken an interconnect via while removing the old unit. (it did not come out as easy as I had hoped)
I have discovered the schematics for this unit are some kind of top secret as I simply can't find them. I read somewhere there is a former HP tech who works on these. Does anyone have contact information? I would like to send the main board for repair to this person if it can be done for a reasonable fee.
One unit has a bad PSU which is a poor design with the caps up against heatsinks. I replaced the puffed up caps but it looks like the bad caps took out a FET. Thanks to the member who did some reverse engineering? and provided notes I should be able to repair. In the long run I hope to simply get one to the point where I don't have to do the entire cal procedure every time I want to use it.
Thanks, Bill N5ZTW .
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Re: Adjustment procedure for 355C VHF Attenuator?
Jared bravo for the find, and troubleshooting, had thought it was mint perfect....mine were like new..
Max Power 1/2 W rated, easy to overload.
Marvelous units, very useful.
Bon chance
Jon
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Re: Adjustment procedure for 355C VHF Attenuator?
Thanks for the info so far!
I have had a closer look and it seems someone has had their sticky fingers in here previously.
One screw and the 4 feet are missing, a BNC has been replaced, and one resistor had a crack at the end and the end-cap where the leg bonds to the body and just fell away. I think this may have been dropped at one point in its life probably.
I have measured all the resistors, and all but a few are way out of the 0.5% tolerane that is written on the resistor body, with the worst sitting at 10.5% high.
I also measured the microswitches and they all measure under 0.005 ohms with 4-wire measurement, so at least they seem good.
The cam action is perfect and the dial switches the microswitches properly too.
At this point, I think I don't have much to lose in replacing the resistors, I think there may have been water ingress as there was a little bit of corrosion of the aluminium inside, so maybe this has affected the resistors.
The trick is finding the correct resistor values... and a BNC connector, part number 1250-0254, and a screw and feet too... Anyone got some spare parts? :D
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Re: Adjustment procedure for 355C VHF Attenuator?
Jared, just pulled my 355C and D, was curious about your post.
Used HP network /Spectrum Analyzer 4195A, and 50 ohm Zo TR sets, with no cable, just BNC adapters.
Did TX cal, 10 kHz..500 MHz, at 0 db.
Every position 1...10 and 10..120 db was within 0.1 db or better.
I recall these use a thick film c¨¦ramique laser trimmed attenuator r¨¦sistance, like a scope wideband attenuator.
Suggest that you check your gen, meters and terminations resistance before attempting "repair"
Bon courage
Jon
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Re: Adjustment procedure for 355C VHF Attenuator?
Jared: Have many 355C and D, excellent attenuators.
But your readings are so close, the range of error of your setup and instruments will be an issue. EG how close is your source and termination to 50 .000 Ohms?
Simple DC test:
Get a precision stable DC refences, and exact 50.00 Ohm R for source and term, eg 1.000 V ,(watch dissipation!) place 4.5..6.5 digit DVM at input and output, get ratios.
As the resistors are very wideband you may do more harm than good to "trim" or adjust!
"if it isn't broke don't fix it!"
Jon
Kind Regards,
Jon
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Re: Adjustment procedure for 355C VHF Attenuator?
The only way that I know of is to replace the resistors. One thing to keep in mind is that the readings will be different at higher frequencies, due to capacitance and inductance of the resistor networks. From your tests, it looks like some of the switches are not working properly. For instance, 9dB uses the 6dB and 3dB in series. You show no error for 6dB and 9dB, yet 3db is out of spec. I would try rotating the selector a few dozen times, then retest. You may need to replace those switches. The cams may be worn a bit. Is there any adjustment to the switch position? I have some of these, but they are boxed up right now.
On Sun, Feb 6, 2022 at 12:47 AM Jared Cabot via <jaredcabot= [email protected]> wrote: Hi all,
I recently picked up a 355C VHF Attenuator for a cheap price that I was able to repair by cleaning the cam section to allow the mechanism to press on the micro switches reliably (a little corrosion on the aluminium casting was binding up the works).
Now, I do know enough to leave the other parts well enough alone, no touching of the metal plates that form the gimmick capacitors used for trimming the unit into spec, etc.
However, after testing the ranges at 1kHz (all I've done so far, still repairing my function gen capable of 500MHz and 1GHz) I have found some ranges are out of spec.
Here are the results:
dB Set??? Measured dB??? dB Difference (spec = 0.1dB@1kHz)
0??? ??? ?? - ??? ?? 11.97??? ??? -??? ??? -0.03dB
1??? ?????? -??? ??? 10.94??? ??? -??? ??? -0.06dB
2?????????? -??? ??? 9.87??? ? ? ? -??? ??? -0.13dB
3?????? ??? -??? ??? 8.86?? ?? ??? -??? ??? -0.14dB
4??? ?????? -??? ??? 7.85??? ?? ?? -??? ??? -0.15dB
5?????????? -??? ??? 6.81??? ?? ?? -??? ??? -0.19dB
6?????????? -??? ??? 6.00??? ?? ?? -??? ???? 0.00dB
7?????????? -??? ??? 5.02??? ?? ?? -??? ??? +0.02dB
8?????????? -??? ??? 3.99??? ?? ?? -??? ??? -0.01dB
9?????????? -??? ??? 3.00??? ?? ?? -??? ???? 0.00dB
10???????? -??? ??? 2.01??? ?? ?? -??? ??? +0.01dB
11???????? -??? ??? 0.99??? ?? ?? -??? ??? -0.01dB
12???????? -??? ? ? 0.00??? ?? ?? -??? ??? Reference setting
You can see that settings 2, 3, 4, and 5 are out of spec.
Now my question... Does anyone know if the adjustment procedure was ever released by HPAK? Or has anyone figured it out?
I have this device working quite well apart from those few settings reading too low and I got this device very cheap, so I'm not averse to a bit of guided tweaking.
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Adjustment procedure for 355C VHF Attenuator?
Hi all,
I recently picked up a 355C VHF Attenuator for a cheap price that I was able to repair by cleaning the cam section to allow the mechanism to press on the micro switches reliably (a little corrosion on the aluminium casting was binding up the works).
Now, I do know enough to leave the other parts well enough alone, no touching of the metal plates that form the gimmick capacitors used for trimming the unit into spec, etc.
However, after testing the ranges at 1kHz (all I've done so far, still repairing my function gen capable of 500MHz and 1GHz) I have found some ranges are out of spec.
Here are the results:
dB Set??? Measured dB??? dB Difference (spec = 0.1dB@1kHz)
0??? ??? ?? - ??? ?? 11.97??? ??? -??? ??? -0.03dB
1??? ?????? -??? ??? 10.94??? ??? -??? ??? -0.06dB
2?????????? -??? ??? 9.87??? ? ? ? -??? ??? -0.13dB
3?????? ??? -??? ??? 8.86?? ?? ??? -??? ??? -0.14dB
4??? ?????? -??? ??? 7.85??? ?? ?? -??? ??? -0.15dB
5?????????? -??? ??? 6.81??? ?? ?? -??? ??? -0.19dB
6?????????? -??? ??? 6.00??? ?? ?? -??? ???? 0.00dB
7?????????? -??? ??? 5.02??? ?? ?? -??? ??? +0.02dB
8?????????? -??? ??? 3.99??? ?? ?? -??? ??? -0.01dB
9?????????? -??? ??? 3.00??? ?? ?? -??? ???? 0.00dB
10???????? -??? ??? 2.01??? ?? ?? -??? ??? +0.01dB
11???????? -??? ??? 0.99??? ?? ?? -??? ??? -0.01dB
12???????? -??? ? ? 0.00??? ?? ?? -??? ??? Reference setting
You can see that settings 2, 3, 4, and 5 are out of spec.
Now my question... Does anyone know if the adjustment procedure was ever released by HPAK? Or has anyone figured it out?
I have this device working quite well apart from those few settings reading too low and I got this device very cheap, so I'm not averse to a bit of guided tweaking.
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Re: 8596E cal: not stored
To be clear, there's the "calibration data" which is the result of the unit's self-cal routines, and then there's the "correction constants" which is the characterization of the attenuator, reference oscillator, etc. that's performed using external equipment.? Both sets of numbers are stored in the battery backed SRAM.
The calibration data is regenerated when the self-cal is run, but without accurate correction constants the unit will not meet its specifications.? If you're battery was dead when you received the unit, you've unfortunately lost your correction constants.? But if you're saying the attenuator was already in need of replacement, you would need to regenerate the correction constants anyway.
Regenerating the correction constants is covered in Section 2 of the Assembly-Level repair manual.
The supercap was probably ok.? It's only there to keep the SRAM running for a few hours while you change the battery.
-mark
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Re: 8596E cal: not stored
On Sat, Feb 5, 2022 at 01:04 PM, Franco Macci¨° wrote:
Taken on ebay with battery and 0 volt supercap, even the attenuator is broken, it does not complete the amplitude calibration I think for this reason, I will have to replace it with a new one, I hope that afterwards it will be able to perform the two cals and be able to store the data calibration.
---- In the service manual it tells how to record current calibration constants, most likely you will see random data there. Still worth recording. Section 3 of the service manual describes what to do when calibration constants are not valid. I didn't need this step, I recorded constants before battery replacement and didn't lose data, so no firsthand experience. You need to start with something ballpark right to continue with the auto-cal steps.? Ozan
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Re: 8596E cal: not stored
Taken on ebay with battery and 0 volt supercap, even the attenuator is broken, it does not complete the amplitude calibration I think for this reason, I will have to replace it with a new one, I hope that afterwards it will be able to perform the two cals and be able to store the data calibration.
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I would like a copy also, please.
Bob K6DDX
On Saturday, February 5, 2022, 12:53:04 PM PST, N5ZTW via groups.io <n5ztw@...> wrote:
Thank you and yes I would like a copy of the service manual schematic please
Bill
On Jan 31, 2022, at 1:21 PM, sv1aku via groups.io <sv1aku@...> wrote:
Hi Bill,
see attached PSU schematic I got from a guy back in 2009 when I was trying to repair my HP 54501. I also have the 54501 schematic in PDF ( from 90903 service manual supplement)? if anybody ever? needs it.
Thanks,
Konstantinos SV1GSI
¦²¦Ó¦É? ¦¤¦Å¦Ô¦Ó?¦Ñ¦Á 31 ¦©¦Á¦Í¦Ï¦Ô¦Á¦Ñ?¦Ï¦Ô 2022, 07:28:12 ¦Ì.¦Ì. EET, ¦Ï ¦Ö¦Ñ?¦Ò¦Ó¦Ç? N5ZTW via groups.io <n5ztw@...> ?¦Ã¦Ñ¦Á¦×¦Å:
Howdy friends, I have a pair of 54503A scopes. Both had the dreaded Dallas semi Battery ram chip go bad.
I purchased a new Dallas unit and pulled the bad installed a socket and the new unit. Now The system will not boot I have garbage on the screen.
Pretty sure I must have broken an interconnect via while removing the old unit. (it did not come out as easy as I had hoped)
I have discovered the schematics for this unit are some kind of top secret as I simply can't find them. I read somewhere there is a former HP tech who works on these. Does anyone have contact information? I would like to send the main board for repair to this person if it can be done for a reasonable fee.
One unit has a bad PSU which is a poor design with the caps up against heatsinks. I replaced the puffed up caps but it looks like the bad caps took out a FET. Thanks to the member who did some reverse engineering? and provided notes I should be able to repair. In the long run I hope to simply get one to the point where I don't have to do the entire cal procedure every time I want to use it.
Thanks, Bill N5ZTW .
<supplyHP54503.pdf>
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Thank you and yes I would like a copy of the service manual schematic please
Bill
On Jan 31, 2022, at 1:21 PM, sv1aku via groups.io <sv1aku@...> wrote:
Hi Bill,
see attached PSU schematic I got from a guy back in 2009 when I was trying to repair my HP 54501. I also have the 54501 schematic in PDF ( from 90903 service manual supplement)? if anybody ever? needs it.
Thanks,
Konstantinos SV1GSI
¦²¦Ó¦É? ¦¤¦Å¦Ô¦Ó?¦Ñ¦Á 31 ¦©¦Á¦Í¦Ï¦Ô¦Á¦Ñ?¦Ï¦Ô 2022, 07:28:12 ¦Ì.¦Ì. EET, ¦Ï ¦Ö¦Ñ?¦Ò¦Ó¦Ç? N5ZTW via groups.io <n5ztw@...> ?¦Ã¦Ñ¦Á¦×¦Å:
Howdy friends, I have a pair of 54503A scopes. Both had the dreaded Dallas semi Battery ram chip go bad.
I purchased a new Dallas unit and pulled the bad installed a socket and the new unit. Now The system will not boot I have garbage on the screen.
Pretty sure I must have broken an interconnect via while removing the old unit. (it did not come out as easy as I had hoped)
I have discovered the schematics for this unit are some kind of top secret as I simply can't find them. I read somewhere there is a former HP tech who works on these. Does anyone have contact information? I would like to send the main board for repair to this person if it can be done for a reasonable fee.
One unit has a bad PSU which is a poor design with the caps up against heatsinks. I replaced the puffed up caps but it looks like the bad caps took out a FET. Thanks to the member who did some reverse engineering? and provided notes I should be able to repair. In the long run I hope to simply get one to the point where I don't have to do the entire cal procedure every time I want to use it.
Thanks, Bill N5ZTW .
<supplyHP54503.pdf>
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Re: 8596E cal: not stored
The manual says that error will occur if there aren't valid amplitude calibration values in use.? Run "CAL FREQ & AMPTD", then store.
Was your supercap defective that you replaced it?? Did you backup your correction constants first?
You probably lost your stored (and valid) amplitude calibration values when you replaced the battery and supercap, which is why it won't store just the frequency values.
-mark
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Re: HP 8648C keyboard mostly dead
Hi Kirb,
I own an HP 8648B but I don't currently have access to it, since I'm not in the lab over the weekend.
I could imagine that the attenuator stepping doesn't take place, unless the RF output is enabled, so that could explain the lack of clunking, since you can't enable the RF output.
If that is so, it could just be keyboard a problem:
The keyboard employs a selectively silverpaint-covered foil, which suffers from multiple keypressing and corrosion / air pollution, leading to interruptions.
Notwithstanding the fact that usually quite a lot of places are affected, these are really easy to repair by applying some (very little) conductive (silver containing) paint to bridge the gaps in the traces.
If this is what happened with your instrument, you'll probably see that in some areas, operating the silicone rubber keypad has caused prolonged rubbing over the conductive traces connecting the keypads (interleaved combs), even though a plastic layer should prevent that from happening.
Easy to find out (after some disassembly), easy to repair. Be careful with the conductive paint, since even an almost invisible smudge causes enough conduction to confuse the keyboard circuits.
Good luck!
Raymond
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You refer to a book but no link? or how to read it alternatively it could be uploaded as a PDF to the file section on this site ??An alternatively solution to display a diode detector on an analogue display could be HP 7563A Log Voltmeter / Amplifier, as we use one in an education lab?The 415 SWR meter dues take an EXTAL input but requires a modulated RF input ?But I think trying to use a 432 for an EXTAL input is a case of using the wrong instrument for the job ? ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Radu Bogdan Dicher
Sent: 04 February 2022 23:20
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP detector ? Jeff, "The guy" is asking whether you'd be willing to share directions for building a suitable detector for my initial request? :) In my book, DIY is the way, if possible. Thank you much in?advance.? ? No can do: apples vs oranges 432 uses RF thermistors, not set up for diodes.
In a message dated 2/4/2022 5:38:23 PM Eastern Standard Time, joeprice@... writes:
Hi Jeff,?
How about posting in files or here on how to build your own HF detector for HP432.?
Tnx? ? Joe? ?wa9cgz
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James Sawle (MD0MDI)
Paul Bicknell
Froggie the Gremlin
Jared Cabot
Michael A. Terrell