Advice HP E3610 vs HP 6236B

[bingo600]

Gents i need some advice

I have bought a HP E3610A on ebay , 17-May.
Condition was : Seller refurbished - fully working
Price €100 + €30 in shipping.

As i still havent received it , i asked seller for a tracking number.
But got this ansver (why should that take 10+ days anyway ? ):

Hello
While preparing your order we had a problem with HP E3610A power supply (current regulation problem).
We can not deliver power supply in that state and we are not sure you can still fix it.
We can offer you in exchange another power supply :

HP 6236B DC Power Supply Triple (Triple Output DC Power Supply)
SPECIFICATIONS
- Triple Output - 35 Watts
- 0 to +6 V; 2.5A
- 0 to +20 V 0.5A
- 0 to-20V, 0.5A
- 0 to ± 20 V tracking outputs rated at 0.5A with a single output rated at 0 to 6 volts at up to 2.5A
- Independent controls voltage
- Separate dual-range panel meters allow Both the voltage and output current of Any To Be Monitored phrasal
- Input Power: 230V ac



The sale price is 150€ but we offer at 100€ as the model E3610A.
Are you agree this this ?
If yes, we will send power HP 6236B instead of E3610A

I'm wondering what i should do .....

I have 2 HP 6632B's (nice but noisy), and bought this one for fanless burn-in of misc Rubidiums , Voltage-Ref's etc.
So i was really hoping for a E3610A.

I'm a bit of an analog noob , but doesn't have a "dual output PSU".
Maybe later on in my electronic quest i'll play around with opamps ,where +/- 20v is nice.

 My question is if €100 is a good price for a 6236B , and i should say yes for the "dual function" , or if i should let the deal go back. And hope for another "Payable E36xx PSU - in EU"
And maybe even complain to ebay (they prob doesn't care anyway)

TIA
Bingo

[free_electron]

Ah the old bait and switch routine heh...
The 6236B is not bad but is a generation older than the e3610.
The e3610 has digital meters as opposed to analog on the 6236B .
E3610 is fixed voltage , so if you are in europe : do NOT buy a US version ! can't switch it (needs new transformer )  !
6236B  is switchable

problem with the 6236B is that it uses chips in to99 ( round metal can ) which are made out of unobtainium...
that supply is obsolete..

the E3610 is still in production !

the E3610 are easy to repair. there's 3 opamps in it. LF411 , LF359 and aLM393 if my memory works well. there is exaclty 2 transsitors and a pair of lmm317 lm337 for opamp supply.
repairing is easy. 5$ in parts will brute force replace all chips and transistors. full schematics can and service manual can be downloade dfrom agilents website for free.

http://cp.literature.agilent.com/litweb/pdf/5950-1782.pdf  gives you the 6263b

http://cp.literature.agilent.com/litweb/pdf/E3620-90001.pdf gives you the e3610 family ( there's more then one. only difference is voltage rating on the caps / transformer and end stage transsitor + some passives change. schematic is identical

i would go for the e3610. bid it down 20$ and repair it yourself. they are very easy to service. pop the rear bezel off , open clamshell . done. not a single screw. all through hole parts easily accessible. the service manual even has a fault isolation flowchart telling you what is bad in what condition. and the front panel pots are multiturn ...

[T4P]

When it comes to buying things my main priority is to NOT buy something made out of unobtainium or anything older then the E3000 series
Because the parts have all gone obsoletium, i would rather not touch a power supply like that ... or a analog meter power supply

[bingo600]

Thanx guyzz

I have contacted the seller , and told him that i would like to try to repair it.
I also wrote that a 25% decuction in price would be fair , for a defective PSU.

I will let you know the outcome

Bingo

[bingo600]

Well the PSU should be on the way here.
Seller accepted a 25€ deduction from 100 to 75€ , as the PSU is defective.

So now i'm just waiting and hoping i can fix it.
Well i hope to get some help from here if i get stuck.

Thanx guyzz

/Bingo

[drakke]

the E3610 are easy to repair. there's 3 opamps in it. LF411 , LF359 and aLM393 if my memory works well. there is exaclty 2 transsitors and a pair of lmm317 lm337 for opamp supply.
repairing is easy. 5$ in parts will brute force replace all chips and transistors. full schematics can and service manual can be downloade dfrom agilents website for free.

http://cp.literature.agilent.com/litweb/pdf/5950-1782.pdf  gives you the 6263b

http://cp.literature.agilent.com/litweb/pdf/E3620-90001.pdf gives you the e3610 family ( there's more then one. only difference is voltage rating on the caps / transformer and end stage transsitor + some passives change. schematic is identical

Can you tell me how you found these HP/Agilent manuals?

Maybe it is not possible anymore. I cannot seem to replicate this search.

[rdl]

I have a couple of the E3610A, neither really works right. I downloaded a manual for it and a bunch of "service notes". Nothing I have has any kind of "fault isolation flowchart" that I remember. I'd like to find that. None of the "service notes" I found specifically address the problem my E3610As have, but I can post them here if you can't find them.

[drakke]

None of the "service notes" I found specifically address the problem my E3610As have, but I can post them here if you can't find them.

That's ok. I have some manuals.
I wanted to know how to search Agilent's literature repository.

[macboy]

Ah the old bait and switch routine heh...
The 6236B is not bad but is a generation older than the e3610.
The e3610 has digital meters as opposed to analog on the 6236B .
E3610 is fixed voltage , so if you are in europe : do NOT buy a US version ! can't switch it (needs new transformer )  !
6236B  is switchable

problem with the 6236B is that it uses chips in to99 ( round metal can ) which are made out of unobtainium...
that supply is obsolete..

the E3610 is still in production !

the E3610 are easy to repair. there's 3 opamps in it. LF411 , LF359 and aLM393 if my memory works well. there is exaclty 2 transsitors and a pair of lmm317 lm337 for opamp supply.
repairing is easy. 5$ in parts will brute force replace all chips and transistors. full schematics can and service manual can be downloade dfrom agilents website for free.

http://cp.literature.agilent.com/litweb/pdf/5950-1782.pdf  gives you the 6263b

http://cp.literature.agilent.com/litweb/pdf/E3620-90001.pdf gives you the e3610 family ( there's more then one. only difference is voltage rating on the caps / transformer and end stage transsitor + some passives change. schematic is identical

i would go for the e3610. bid it down 20$ and repair it yourself. they are very easy to service. pop the rear bezel off , open clamshell . done. not a single screw. all through hole parts easily accessible. the service manual even has a fault isolation flowchart telling you what is bad in what condition. and the front panel pots are multiturn ...

You linked to the E3620A manual. This is quite different than the E3610A. It doesn't overshoot when you turn it on, and doesn't oscillate with certain loads, for example. The E3620A uses a single darlington BJT as a series pass transistor; the E3610A and siblings use MOSFETs. Also, the manual you linked to does not have the schematic (that was removed after Agilent stopped servicing these at the component level).

The E3610A/E3611A/E3612A share a common design and schematic (with small variations). This must be what you were thinking.

You might try http://www.physics.fsu.edu/users/Wahl/labmanuals/instruments/ps/AgilentE361xAManual.pdf

[rdl]

You linked to the E3620A manual. This is quite different than the E3610A. It doesn't overshoot when you turn it on, and doesn't oscillate with certain loads, for example.

Wait a minute, overshoot and oscillate? You are saying that this is how the E3610A works normally?

[macboy]

You linked to the E3620A manual. This is quite different than the E3610A. It doesn't overshoot when you turn it on, and doesn't oscillate with certain loads, for example.

Wait a minute, overshoot and oscillate? You are saying that this is how the E3610A works normally?

Sadly yes. This is not HP's finest design. There are service notes on the Keysight site that detail some of these problems and modifications to fix them. Look up the model number, go to document library, and find service notes.

[rdl]

I have all the service notes. None of them specifically mentions overshoot when turned on. I think one said something like "overshoot when voltage pot is adjusted", and there are a couple that do mention oscillation.