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Re: 8751A Input Overload

 

¿ªÔÆÌåÓý

Hi,

?

If you press ENTRY OFF, does the message disappear and appear again?

?

I have an 8751A, and it works very well. If you connect Port#1 output directly to port R, by default, the RF output is at 0dBm, and at +5dBm it is the limit, there will be a POWER TRIP signal too strong with the Overload message if the signal is > +5dBm. Make sure you have 0dBm and that the attenuator (ATTEN button) is at 20dB which is the default value for ports A, B and R.

?

Great VNA!

?

Yves

?

De?: [email protected] <[email protected]> De la part de vee-dub565 via groups.io
·¡²Ô±¹´Ç²â¨¦?: 12 d¨¦cembre 2024 14:37
??: [email protected]
Objet?: [HP-Agilent-Keysight-equipment] 8751A Input Overload

?

I just acquired an 8751A 5Hz to 500MHz network analyser. We have one of these at work and I thought I get my own to use for personal stuff. So I've set it up for a basic through measurement with a cable from RF Out to R and it cals out ok, but then comes up with input overload error.?

Before I delve into the service manual just wondered if anyone on here had any thoughts. Maybe it's an adjustment somewhere needs tweaking ?

?

If it's genuinely faulty then I might just get rid of it again spares or repair. I already have an 8753C and 8510C?
8751A Input Overload

 

I just acquired an 8751A 5Hz to 500MHz network analyser. We have one of these at work and I thought I get my own to use for personal stuff. So I've set it up for a basic through measurement with a cable from RF Out to R and it cals out ok, but then comes up with input overload error.?

Before I delve into the service manual just wondered if anyone on here had any thoughts. Maybe it's an adjustment somewhere needs tweaking ?
?
If it's genuinely faulty then I might just get rid of it again spares or repair. I already have an 8753C and 8510C?
HP 8593A Display repair

 

I have a repair of HP8593A with the following problems:

The PSU was fail. now complete recapping, it works.

The lithium? battery was rip and the memory empty. Now it have a fresh battery, but the shp have to learn what is in the memory.

The display is fail:? I see only a part of the screen, like a zoom in, and vertical triple.
How I can find the problem? It will be in the monitor box, inside.


thank you.
Re: HP 8341B with HP8410B VNA

 

I agree with Chuck - easy to change.? But you could also tke a look at the sweep output with a scope to determine if it is st for 1V/GHz or .5V/GHz.
?
Cheers!
?
Bruce
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Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

Scott, thanks much for the info.? For my 8753ES can you or anyone else in this thread tell me if I want the reverse polarity cable (default) or the forward polarity cable for item No. 1?
?
BRgds....Frank
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

Slight correction regarding Vladan's comment:
On the 8753ES and E, there is also a plastic filler part which is not part of the FD. The 8753D may be different.
?
This is absolutely correct for the 8753ES, but not for the 8753E which has the same physically wider design as the 8753D.? The difference between the original drive on the D and the E is the button position and type for the eject mechanism.? As noted, the holder (metal exterior mounting hardware) for the ES is narrower and will not fit these new Gotek drives without modification, but this is not an issue for the 8753D and 8753E models.? The 8753E holder can be mounted in the 8753ES if you want to use one of these to mount a Gotek drive into an 8753ES without physically modifying the drive.
?
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

A lot of thanks for all that very useful compilation Vladan!
Renaud
Re: HP 8566B issue above 18.5GHz ?

 

Hi Saevar,
You are right, it is definitely a problem with the analyzer. I am afraid to make any adjustments inside the device at the moment because I do not have an RF power meter at the moment, and I don't have much experience in this matter, and I don't want to mess anything. I have to study the manual first, and due to limited free time I can only do it in my free time.
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Don Bitters - I haven't try yet, but I will try it on the weekend and post here results.
?
Regards, Wojciech
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

My two Aliexpress "Gotek" drives came with latest release of the FlashFloppy fw.
/Marcus
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

?
For those who would like to replace a broken FD in the 8753ES, here is some information I found in my files. I have replaced several of the Teac floppy drives over the years. I found my notes, no guarantee that the information is entirely correct. It appears to me that all Teac FD-05HF drives are pretty much the same thing except for things like bezels and doors. Variants can be black with a blue eject button, or various shades of gray and beige. On the 8753ES and E, there is also a plastic filler part which is not part of the FD. The 8753D may be different. There are also versions which are configured differently at the Teac factory, but that may be something anyone can do. So, I think those numbers and letters after FD-05HF refer to plastic parts and possibly some configuration setting, perhaps a jumper - I don't recall if there is one.
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There is also a family of drives called FD-05HG. As far as I could determine, the HG version is a superset of the FD-05HF. One difference is that the HG can be configured for 300 or 360 RPM. This is done with a jumper, pin 13.
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For those who are replacing the FD with an emulator, make sure that the emulator can be used to back up the EEPROM and also for loading the firmware.
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I also found a list of HP products which used the Teac FD. It looks like I got this off the HP/A/K parts finder page.
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Vladan
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Products using part 0950-2782 (8753ES)
? ? 1660E
? ? 1660EP
? ? 1660ES
? ? 1661E
? ? 1661EP
? ? 1661ES
? ? 1662E
? ? 1662EP
? ? 1662ES
? ? 1663E
? ? 1663EP
? ? 1663ES
? ? 16700B
? ? 16701B
? ? 16702B
? ? 1670E
? ? 1670G
? ? 1671E
? ? 1671G
? ? 1672E
? ? 1672G
? ? 1673G
? ? 1680A
? ? 1680AD
? ? 4156B
? ? 4287A
? ? 54621A
? ? 54621A-003
? ? 54621D
? ? 54621D-003
? ? 54622A
? ? 54622A-003
? ? 54622D
? ? 54622D-003
? ? 54624A
? ? 54624A-003
? ? 54835A
? ? 54853A
? ? 54854A
? ? 54855A
? ? 8164A
? ? 8164B
? ? 84105EM
? ? 85070M
? ? 8510C
? ? 85301B
? ? 86037A
? ? 86037B
? ? 86037C
? ? 86082A
? ? 86121A
? ? 86140A
? ? 86140B
? ? 86141B
? ? 86142A
? ? 86143A
? ? 86143B
? ? 86144B
? ? 86145A
? ? 86145B
? ? 8702D
? ? 8702E
? ? 8719D
? ? 8719ES
? ? 8719ET
? ? 8720D
? ? 8720ES
? ? 8720ET
? ? 8722D
? ? 8722ES
? ? 8722ET
? ? 8753D
? ? 8753E
? ? 8753ES
? ? 8753ET
? ? E4401B
? ? E4402B
? ? E4403B
? ? E4404B
? ? E4405B
? ? E4406A
? ? E4407B
? ? E4407S
? ? E4408B
? ? E4411B
? ? E4440A
? ? E4991A
? ? E5100A
? ? E5100B
? ? E5501A
? ? E5501B
? ? E5502B
? ? E5503A
? ? E5503B
? ? E5504A
? ? E5504B
? ? E6000C
? ? E6001A
? ? E6002A
? ? E6004A
? ? E6020A
? ? E7401A
? ? E7402A
? ? E7403A
? ? E7404A
? ? E7405A
? ? E8356A
? ? E8357A
? ? E8358A
? ? E8361A
? ? E8361AH17
? ? E8362A
? ? E8362B
? ? E8363A
? ? E8363B
? ? E8364A
? ? E8364B
? ? E8801A
? ? E8802A
? ? E8803A
? ? N1881A-E22
? ? N1881A-E23
? ? N1881A-E29
? ? N3381A
? ? N3382A
? ? N3383A
? ? N4901B
? ? N4902B
? ? N4903A
? ? N4906B
? ? N5230A
? ? N8972A
? ? N8973A
? ? N8974A
? ? N8975A
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Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

Scott, it looks like you are correct. Here is a detail from one of the pictures in the ebay listing.
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V.
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Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

Vladan,
?
Evidently the SW on this SFR1M44-DU26 kind of sucks and may not work with some machines.? People online claim that something called Flashfloppy [] works a lot better.? However, it's a tad tricky to get this installed on the drives.? There are some decent instructions here [] about half way down the page.? Perhaps the seller on ebay went throught the process of installing flashfloppy on a number of drives and then sold them at for $120 rather than the normal price of $40???? I suppose that after the ebay fees you would make about $50/unit.? If you modified a bunch of these you could probably modify a unit in 30 minutes or less?? That's a lot of assumptions on my part.
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

Scott, there is a chance that the ebay seller is making some firmware changes to the standard SFR1M44-DU26 GoTek emulator.
?
Vladan
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

I think that you all are on the right track here.? Gotek makes a model which fits available in various places:
?
1)? ebay - confirmed compatibility by seller (thanks Vladan) for $120: https://www.ebay.com/itm/333459123742?epid=20028560258&hash=item4da3b66e1e:g:QjsAAOSwcABeCbYb
2)? Amazon - Appears to be the same, but not confirmed for $70: ?
3)? On Gotek site (but minimum quantity for orders is 10 pcs.? Price unknown: ?
4)? On aliexpress (Thanks John) - about $40:? Please note - there are two versions - one which is for 1.44 MB and another which is for 720 KB.? I believe that only the former (1.44 MB) will work (but am not 100% sure - kind of like spelling Teak):? Search for SFR1M44-DU26 GOTEK USB DRIVE.
?
I am tempted to order one on aliexpress to see if they work better than my spell-checker.
?
Re: HP 8341B with HP8410B VNA

 

Chuck,
Good advice, taken.? Thanks
Interfacing 8410B/8750A Stg Norm with 8341B sweeper

 

Should there be any real difference in interfacing an 8750A storage normalizer with an 8410B+8412B+8341B (as opposed to the documented 8410B+8412A+8620 procedure)???
The only real difference I can see in the cabling diagram is that my 8412B display unit does not have a "Blanking" input.??
Right now I can't get past the first step:? CH1, Bypass, then press Input and "you should be able to find a trace".? But I can't, with any adjustment on the 8750A or the NA card.
Next step is to tear the 8750A apart but maybe there's an undocumented trick?
Thanks,
Re: Seeking manual for HP 651B test oscillator

 

Thanks, Michael.


I already have PDF files of the -90004 & -90005 manuals. But these apply to very early (~1960¡¯s) 651s. The unit I am working on contains date codes of 1983.



Greg
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

On 12/10/24 15:19, Marcus Gustafsson via groups.io wrote:
the Gotek drives I've bought are 25mm high so I have to remove the encoder button, replace the screen with a smaller one, 0.91" 128x32 OLED and 3D print a new case.


$27 +3.4 = 30.4 USD
Re: HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information

 

¿ªÔÆÌåÓý

For small outline drive replacements have a look at this


I use one of these in my Agilent 54641D MSO.?

Wilko

Re: Troubleshooting a 8591e with opt 130

 

¿ªÔÆÌåÓý

Hi Marco,

?

Glad to hear that your 8591E is working properly.

Yes indeed, not always easy to measure, but we always end up finding a way to get there.

?

I attached the constants for the flatness of my 8591A, this gives you an idea of ??the level of correction to be made.

The correction table for the flatness of my 8595E, does not use the same frequencies for the range up to 1.8GHz.

?

Have fun with your 8591E!

?

Yves

?

De?: [email protected] <[email protected]> De la part de jansen.marco90 via groups.io
·¡²Ô±¹´Ç²â¨¦?: 10 d¨¦cembre 2024 16:01
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] Troubleshooting a 8591e with opt 130

?

Hey Yves,

?

Just a small update on the analyzer. Everything seems to be fine, also with the FADC option installed. I'll see if I can do some level corrections and perhaps do a Lin/Log adjustment some day. But for now I'm happy with my analyzer.

?

Thanks a lot for all your help! You really went through a lot of trouble measuring and modifying your analyzer to check things.?

?

Marco

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FLATNESS 8591A.txt
FLATNESS 8591A.txt

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