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  1. HP-Agilent-Keysight-Equipment
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Expanded Topics Messages
Date
Re: 5065A rubidium frequency standard, no 2nd harmonic.

 

I have the Leo Bodnar GPS standard to compare against, should I pull the 5MHz from the front or rear panel of the 5065A, or directly from the OCXO module?
Re: Looking for a 16534a or 16533a oscilloscope card

 

I too have a '532A that I'd like to re-home for a nominal sum, if anyone is interested.

-Dave

On 11/22/21 1:05 PM, Bruce wrote:
If you have a '34 (that he doesn't buy) I'm interested
Quoting "Precaud via groups.io" <jbau@...>:

I have a 16532A if that willl work for you. Will have to look to see if I have any 33's or 34's left.


--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Looking for a 16534a or 16533a oscilloscope card

 

If you have a '34 (that he doesn't buy) I'm interested
Quoting "Precaud via groups.io" <jbau@...>:

I have a 16532A if that willl work for you. Will have to look to see if I have any 33's or 34's left.
Re: I'm old 70+, the 70K system is old; good or bad omen?

 

On 11/21/21 10:56 PM, Gene Silvernail wrote:
The as-found is shown on the right…so I tried the settings in Figure 2.4 ?as shown below… still no cigar…70900A still MIA ON Map?
Gene, seriously, check those capacitors on the power supply board. This is not just an occasional problem; seriously, 3/4ths of the 70900s that have gone through here have had that failure.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Looking for a 16534a or 16533a oscilloscope card

 

I have a 16532A if that willl work for you. Will have to look to see if I have any 33's or 34's left.
Re: 8341A *restoration adventure*

 

Yes, I'll do that, thanks Bruce

I just order the band 0 amplifier, a working and tested unit from eBay located in NJ. When it arrives, I'll redo several test and see the behavoir of the unit before next movement or deal. I think the improvement will be juicy, because the low band signal is important to the SYTM to multiply and mix the final signal, if I understand the theory of operation.

Meanwhile I need to check the entry display connection, because the right vertical lines of all digits are off (maybe you saw this in the photos). Idk if it's a connection problem as it happened in my 8663A. Also I need to check why the main line voltage selector doesn't allow work with 230 VAC... maybe the contacts are dirty, I placed the cam properly and change the fuse and nothing works (not even the standby mode).?And the third task is straighten the lower front panel, bent because of crash during overseas travel. I will post photos of those side-tasks.

Best regards,
R.
Re: SMD rework on an HP PCB

 

VFD?
A search shows Variable Frequency Drive but since I have played with Nixies and Numitrons maybe it is Vacuum Fluorescent Display.
I wish people would define the first instance of an acronym. Some have dozens of meanings.

On Sun, Nov 21, 2021 at 8:07 PM Stan <swperk@...> wrote:
Turns out that it's the VFD in my 58503A that is bad, and not the driver chip.

The good news is that I don't have to do any PCB rework. The bad news is that I have to find a replacement VFD at a reasonable price.

Any ideas (besides eBay)? And if I do end up buying on eBay, does anyone have any experience with replacement VFDs from China?

Thanks,
Stan

8662A: what is behind options 043 and W55?

 

I am wondering what is behind the options 043 and W55 of my 8662A (S/N prefix 2936) and I would be glad if somebody is out there who could tell.
Thanks!

Chris
Re: SMD rework on an HP PCB

 

On Mon, 22 Nov 2021 at 01:47, Stan <swperk@...> wrote:
After finding no replacement VFDs under $230 plus tax on eBay, I located a company called PDA Parts that has the Samsung INB-12MM53T VFD in stock. It's the latest iteration of the 53132A display and their photo confirms that it's the correct one. It's "only" $108, but I have no other options so it seems. Anyway, one should be arriving sometime this week or early next week.

I hope that's the only problem, but I'm pretty sure it is. There will be either screams of delight or screams of anguish after I install the new display and power it up!

Stan
I don't know about VFDs, but I once ordered an LCD from Keysight with the same part number as the one I had which was damaged. The two LCDs looked quite different on the PCB, but had the same part number. So I replaced the LCD, only to find it did not work. Later Keysight confirmed that I would need to replace at least the front panel keyboard and GPIB board to get the newer model LCD to work. That would have been uneconomic. Luckily they refunded me the cost of the LCD, and told me to keep it.

I have in the past noticed other times where Agilent have made important changes to items, but kept the part number the same. For example, some VNA verification kits have the same part number for the foam insert for a box, but do not fit. Having had this problem a couple of times, Keysight said I needed to buy a new box with foam. I declined, as it was so expensive, so they gave me one free. But then I found the airlines would not fit in the new foam insert.

It seems some part numbers are more equal than others, and just because a part has the same part number as something else, don't assume it will work.

Dave

Re: I'm old 70+, the 70K system is old; good or bad omen?

 

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Hi Gene,

?

I have a working unit and its setting is as show in attached photos. If you follow the same setting and 70900 still not show up then you may have hardware issue… I am just a normal user, if this does not help you, then you may have to wait someone who has hardware knowledge to help you! Good luck!

?

Steve

MSIB setting.jpg
address map.JPG

Re: I'm old 70+, the 70K system is old; good or bad omen?

 

开云体育

Thanks Steve,

?

The as-found is shown on the right…so I tried the settings in Figure 2.4 ?as shown below… still no cigar…70900A still MIA ON Map?

?

?

From: [email protected] <[email protected]> On Behalf Of Steve Cheng
Sent: Sunday, November 21, 2021 4:24 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?

?

Hi Gene,

?

I believe you may have wrong “HP-MSIB/HP-IB Address” setting on your 70900 unit. The plug-in unit on the address map is based on their hardware MSIB/HP-IB Address setting not by default!

?

Steve Cheng

BC Canada

?

?
Re: I'm old 70+, the 70K system is old; good or bad omen?

 

开云体育

Craig,

?

Yeh that’s what I’m circling on also. Thanks for the manual.? I’ve converted this to a text searchable document that you may find useful, see attachment. From what I understand at this point the configuration was duplicated per Figure 2.4 from what was found shown on right below. Power on restart… no change, no cigar. So the next step is a deep dive into the PS board, which like the TV show Cold Case File will have to be done unpowered or cold absent extender cables.

?

Are schematics available on site or at Artec?

?

Again thanks for your help

?

Regards

?

Gene

?

?

From: [email protected] <[email protected]> On Behalf Of Craig Petersen
Sent: Sunday, November 21, 2021 5:58 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?

?

Gene,

The cabling looks correct between the modules according to the document I have in front of me. If all the other modules are showing up in the map the 70900A should be there to. The issue seems to be improper dip switch settings or some other unknown fault with the 70900A. I have attached the file for your reference.

Best Regards,

Craig Petersen.

70900-90314_specifacations text.pdf
70900-90314_specifacations text.pdf

Re: I'm old 70+, the 70K system is old; good or bad omen?

 

Hi Dave

The formula is on the spec sheets I have referred to
for example

Equivalent series resistance (ESR) Calculated from tan δmax. and CR (see
Table 2) ESR = tan δ/2 π f CR

Also it could be we will have to put a higher voltage ratting than was
originally fitted

Regards Paul

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Dave McGuire
Sent: 22 November 2021 02:44
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is
old; good or bad omen?


What formula?

-Dave

On November 21, 2021 9:24:50 PM "Paul Bicknell" <admin@...>
wrote:
Hi Vladan



The specs I looked at had a formula that I did not understand



Regards Paul



From: [email protected]
[mailto:[email protected]] On Behalf Of pianovt via
groups.io
Sent: 22 November 2021 02:13
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system
is old; good or bad omen?



Just a reminder: the supply operates at 40KHz, so search for correct ESR
values in that frequency range.

Vladan






--
Dave McGuire, AK4HZ
New Kensington, PA
Re: I'm old 70+, the 70K system is old; good or bad omen?

 

What formula?

-Dave

On November 21, 2021 9:24:50 PM "Paul Bicknell" <admin@...> wrote:
Hi Vladan



The specs I looked at had a formula that I did not understand



Regards Paul



From: [email protected] [mailto:[email protected]] On Behalf Of pianovt via groups.io
Sent: 22 November 2021 02:13
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?



Just a reminder: the supply operates at 40KHz, so search for correct ESR values in that frequency range.

Vladan






--
Dave McGuire, AK4HZ
New Kensington, PA
Re: I'm old 70+, the 70K system is old; good or bad omen?

 

开云体育

Exactly, and why there were two alternatives.

I've heard both argued.

if the number and amount of parts to be replaced is minimal, I'd go with #2, replace them all

if on the other hand, replacing them all is expensive or bothersome, then I'd think more of replacing the ones that are bad, however you decide *which* are bad.

If there's a history of multiple failures, then I'd do all of them.

My point was that neither approach should be done without further information, depending on failure rate, cost, availability, and so on.

you pays your money for parts and you does your choices......

so to speak.

Harvey


On 11/21/2021 9:01 PM, Paul Bicknell wrote:

Hi Harvey?

Regarding

?

There's a philosophical point where you say:

1) these might be bad, I'll replace then all.

2) I'll only replace the ones that I know are bad.

?

I agree with line 1 in this case? but ?if they all test with correct capacitance and low ESR then it might be worth looking else ware before changing them

It could be that only one capacitor is critical and it wasn’t man enough for the job in the first place Just a thought?

?

Regards Paul

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Harvey White
Sent: 22 November 2021 01:21
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?

?

There's a philosophical point where you say:

1) these might be bad, I'll replace then all.

2) I'll only replace the ones that I know are bad.

To me, it depends on how difficult it would be to replace, and also what the probability is that all of these could be bad.

Your pick.? I don't think that there's an absolute "this is the right way".

Harvey

On 11/21/2021 6:06 PM, Paul Bicknell wrote:

Hi Tom

?

Thank you for looking up the part numbers? please look at the xl document I have put onto the HP 70900 folder in the HP 70000 on this site

as I am using it to compare the values of the capacitors measured in and out of CCT on a number of 70900 units

hopefully this might help speed up repairing 70900 in the future

?

Vladan I have put a number of Vishay spc sheets in the same file along with a list of their suitability? size and availability

?

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of tmillermdems
Sent: 21 November 2021 22:41
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?

?

From the 70900B CLIP:

C32 0180-3068? 470u/12v

C17, C18? 0180-3441? 270u/25v

C52 0180-3443? 560u/7.5v

C43 0180-3068? 470u/12v

C42? 0180-3442? 1200u/12v

AL-ELCTLT

Regards,

Tom

On 11/21/2021 4:34 PM, pianovt via groups.io wrote:

Paul,

If you (or someone else) can post the HP part numbers for the capacitors, there is a chance that I may be able to find out what ESR specs were used when the module was designed.

Vladan

?

This email has been checked for viruses by Avast antivirus software.




Re: I'm old 70+, the 70K system is old; good or bad omen?

 

开云体育

Hi Vladan

?

The specs I looked at had a formula that I did not understand

?

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of pianovt via groups.io
Sent: 22 November 2021 02:13
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?

?

Just a reminder: the supply operates at 40KHz, so search for correct ESR values in that frequency range.

Vladan

Re: I'm old 70+, the 70K system is old; good or bad omen?

 

开云体育

Hi Vladan

?

Thank you just going to bed it is 2:30 am hear

Dues any one have an contacts at Sprague or Sangamo ?

?

Best Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of pianovt via groups.io
Sent: 22 November 2021 02:01
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?

?

Here you go. All are 105C.

================================
C32, C43
0180-3068? 470u/12v
Sprague? 672D477H012DM5J
Sangamo? 301AEM471U012B3
ESR 0.12 Ohm max
Max. ripple current 1.3A

================================
C17, C18
0180-3441? 270u/25v
Sprague? 672D277H025DM5J
Sangamo? 301AEM271U025B3
ESR - sorry, can't find a value.
Max. ripple current 1.35A

================================
C52
0180-3443? 560u/7.5v
Sprague? 672D567H7R5DM5J
Sangamo? 301AEM561U7R5B3
ESR 0.28 Ohm max

===============================
C42
0180-3442? 1200u/12v
Sprague? 672D128H012ET5J
ESR? 0.125 Ohm max
Max. ripple current 2.5A

===============================

Vladan
Re: I'm old 70+, the 70K system is old; good or bad omen?

 

开云体育

Hi Craig

?

Thank you for the manual but? all the manuals we currently have are hear and the Clips are with Artek unfortunately I cannot get to my service manuals or CLIPS at this time

[email protected] | Files

?

Just a thought it might be useful to put some pictures into a file of the correct switch settings

Also I have had switches going open CCT on other HP equipment ?

?

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of Craig Petersen
Sent: 22 November 2021 01:58
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?

?

Gene,

The cabling looks correct between the modules according to the document I have in front of me. If all the other modules are showing up in the map the 70900A should be there to. The issue seems to be improper dip switch settings or some other unknown fault with the 70900A. I have attached the file for your reference.

Best Regards,

Craig Petersen.

Re: I'm old 70+, the 70K system is old; good or bad omen?

 

Just a reminder: the supply operates at 40KHz, so search for correct ESR values in that frequency range.

Vladan
Re: I'm old 70+, the 70K system is old; good or bad omen?

 

OK Dave and Harvey
They are all going to get shot gunned / replaced we currently have about 8 off 70900 LO that are duff in the UK so a solution that works would be very good

Best Regards Paul

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave McGuire
Sent: 22 November 2021 01:27
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?


In the ones I've repaired, every one of those capacitors in that central column have been bad, with no exceptions. Just FYI.

Heh, one of them was particularly weird. The lead *twirled* within the capacitor, as if it were connected to nothing at all inside. I put it on a bridge, and it read a few pF. It was supposed to have been 470uF!

-Dave

On 11/21/21 8:21 PM, Harvey White wrote:
There's a philosophical point where you say:

1) these might be bad, I'll replace then all.

2) I'll only replace the ones that I know are bad.

To me, it depends on how difficult it would be to replace, and also
what the probability is that all of these could be bad.

Your pick. I don't think that there's an absolute "this is the right way".

Harvey

On 11/21/2021 6:06 PM, Paul Bicknell wrote:

Hi Tom

Thank you for looking up the part numbers please look at the xl
document I have put onto the HP 70900 folder in the HP 70000 on this
site

as I am using it to compare the values of the capacitors measured in
and out of CCT on a number of 70900 units

hopefully this might help speed up repairing 70900 in the future

Vladan I have put a number of Vishay spc sheets in the same file
along with a list of their suitability size and availability

Regards Paul

*From:*[email protected]
[mailto:[email protected]] *On Behalf Of
*tmillermdems
*Sent:* 21 November 2021 22:41
*To:* [email protected]
*Subject:* Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K
system is old; good or bad omen?

From the 70900B CLIP:

C32 0180-3068 470u/12v

C17, C18 0180-3441 270u/25v

C52 0180-3443 560u/7.5v

C43 0180-3068 470u/12v

C42 0180-3442 1200u/12v

AL-ELCTLT

Regards,

Tom

On 11/21/2021 4:34 PM, pianovt via groups.io wrote:

Paul,

If you (or someone else) can post the HP part numbers for the
capacitors, there is a chance that I may be able to find out what
ESR specs were used when the module was designed.

Vladan

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--
Dave McGuire, AK4HZ
New Kensington, PA
31281 - 31300 of 151463