Dear members:
Anyone had experience to repair the MAIN Board of HP8559A ?
Problem is displaied signal lower than actually value.
Regard
Tony Cheung
SEP 25 2009
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Hello All
Does anyone have a compatible Display information
for HP Part 1990-0490 ( I Think it is a STD 7 Seg Display )
Comes out from HP 3575A.
Don't want to take a chance.
Thanks
M8JPK
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Re: Foot Assy for (Re: 7562A Log Voltmeter/Converter)
Dave, you describe these as 1/3 wide, but only two fit into a 19" rack
adapater (they came out of one with p/n 5060-8764).
Or am I missing something here?
Dave
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-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of David Wise
Sent: 24 September 2009 17:11
To: 'hp_agilent_equipment@...'
Subject: RE: Foot Assy for (Re: [hp_agilent_equipment] 7562A Log
Voltmeter/Converter)
That cabinet design is known as System I, as are the feet, but the only size
that's commonly available is the single.
The seven-inch bar for the 1/3-wide cabinet is rare; I'm also looking for
two for my 5210A Frequency Meter.
In the meantime we can use generic stick-ons, but we'll have to do without
the bail.
Dave Wise
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Re: 7562A Log Voltmeter/Converter
Arthur, no I'm not in the USA. I'm based in the UK.
I understand what they do, but I don't need that function, and would happily
sell them on to a new home rather than scrap 'em.
(though I don't think that using them for a project qualifies as scrapping -
they are very nice boxes).
Dave
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-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of arthurok
Sent: 24 September 2009 16:13
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 7562A Log Voltmeter/Converter
dont scrap it
they were designed to logrithmicly compress a signal
before going into a chart recorder if you dont like it maybe i
can buy it from you.
are you in the usa??
|
Re: Foot Assy for (Re: 7562A Log Voltmeter/Converter)
That cabinet design is known as System I, as are the feet,
but the only size that's commonly available is the single.
The seven-inch bar for the 1/3-wide cabinet is rare; I'm
also looking for two for my 5210A Frequency Meter.
In the meantime we can use generic stick-ons, but we'll
have to do without the bail.
Dave Wise
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Show quoted text
-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]On Behalf Of ArtekMedia
Sent: Thursday, September 24, 2009 3:56 AM
To: hp_agilent_equipment@...
Subject: Foot Assy for (Re: [hp_agilent_equipment] 7562A Log
Voltmeter/Converter)
These had a "front bail/foot" type front #1490-0032 and the
rear foot
was #5060-0728 built in the late 60's and early 70's
...probably common
to other gear of that era
Dave & Lynn Henderson
ArtekMedia
Out-of-Print Technical Manuals
www.ArtekMedia.com
manuals@...
651-269-4265
David C. Partridge wrote:
OK, these now look like project boxes to me, and very nice ones too, as they
would appear to have spent their life in a rack unit, so aren't bashed
around!
I would rather like some feet for them (they were in a rack adapter).
Each instrument originally had two feet (one at the front,
one at the back).
The feet are a plastic bar about 7" long and 3/4" wide with detents at the
ends for a bail bar, and a push button in the middle with instructions
"Press then slide foot".
|
to be sure... that makes conductive dust
Dave & Lynn Henderson
ArtekMedia
Out-of-Print Technical Manuals
www.ArtekMedia.com
manuals@...
651-269-4265
arthurok wrote:
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i think thats even worse
----- Original Message -----
From: mike To: hp_agilent_equipment@... Sent: Thursday, September 24, 2009 6:47 AM
Subject: [hp_agilent_equipment] Re: 332A balance pots
Darnit - was about to say what a great idea and then - darnit, yes perhaps that would introduce a particulate metal issue... I was thinking a dremel to 'cut' open the epoxied seam perhaps?
Mike
|
Re: 7562A Log Voltmeter/Converter
dont scrap it
they were designed to logrithmicly compress a signal
before going into a chart recorder if you dont like it maybe i can buy it from you.
are you in the usa??
toggle quoted message
Show quoted text
----- Original Message -----
From: ArtekMedia
To: hp_agilent_equipment@...
Sent: Wednesday, September 23, 2009 11:21 AM
Subject: Re: [hp_agilent_equipment] 7562A Log Voltmeter/Converter
All discreet transistors and a few IC's ...Nice little power supply
...must be highly accurate as it has a "heater" (A5 Board) recommends
20-30 minute warm up. Converts AC/DC -IN to LOG out 80dB dynamic range,
auxiliary scope monitor . Hook two of them in series get LOG-LOG out
I'll send you a private email with scan of the description page.
Nice case for a project box
Dave & Lynn Henderson
ArtekMedia
Out-of-Print Technical Manuals
www.ArtekMedia.com
manuals@...
651-269-4265
David C. Partridge wrote:
> Pending anyone turning up a manual for these, what are these good for and
> for that matter are they worth anything?
>
> On another tack - are there any interesting things inside them (there looks
> to be an ovenised "something" in there)?
>
> Cheers
> Dave Partridge
>
>
|
i think thats even worse
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Show quoted text
----- Original Message -----
From: mike
To: hp_agilent_equipment@...
Sent: Thursday, September 24, 2009 6:47 AM
Subject: [hp_agilent_equipment] Re: 332A balance pots
Darnit - was about to say what a great idea and then - darnit, yes
perhaps that would introduce a particulate metal issue... I was thinking
a dremel to 'cut' open the epoxied seam perhaps?
Mike
|
Re: Step attenuator repair stuff uploaded in files section
I just tried to find that file also, but it doesn't seem to be there. Lothar, is there any chance to re-post it? This would be useful, and I must admit that I had missed the original post. I notice that the file space for the list is pretty much full, and probably needs to be weeded out. Might try uploading to another site, like Didier's. Daun _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of dfnr2 Sent: Wednesday, September 23, 2009 7:31 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: Step attenuator repair stuff uploaded in files section I am not able to find the step attenuator repair document. Did it get pulled? Thanks --- In hp_agilent_equipmen <mailto:hp_agilent_equipment%40yahoogroups.com> t@..., "lotharbaier" <lotharbaier@...> wrote:
I have uploaded a word file step attenuator repair, containg commented
pictures which should help anyone who is trying to attempt to repair a step attenuator, this file is about 2.8MB so you need to save it to your loacal drive and then open it, i left it in word to keep it a living document, people may add content to this document (pictures, comments etc and then send it back to me for update)
|
Darnit - was about to say what a great idea and then - darnit, yes perhaps that would introduce a particulate metal issue... I was thinking a dremel to 'cut' open the epoxied seam perhaps?
Mike
|
Foot Assy for (Re: 7562A Log Voltmeter/Converter)
These had a "front bail/foot" type front #1490-0032 and the rear foot was #5060-0728 built in the late 60's and early 70's ...probably common to other gear of that era
Dave & Lynn Henderson
ArtekMedia
Out-of-Print Technical Manuals
www.ArtekMedia.com
manuals@...
651-269-4265
David C. Partridge wrote:
toggle quoted message
Show quoted text
OK, these now look like project boxes to me, and very nice ones too, as they
would appear to have spent their life in a rack unit, so aren't bashed
around! I would rather like some feet for them (they were in a rack adapter).
Each instrument originally had two feet (one at the front, one at the back).
The feet are a plastic bar about 7" long and 3/4" wide with detents at the
ends for a bail bar, and a push button in the middle with instructions
"Press then slide foot".
Does anyone by any chance have such they are prepared to part with?
I fear I don't know the part number, and a search on eBay didn't turn up any
HP feet that remotely matched.
Thanks
Dave
-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of David Wise
Sent: 23 September 2009 17:56
To: 'hp_agilent_equipment@...'
Subject: RE: [hp_agilent_equipment] 7562A Log Voltmeter/Converter
The 7562A has a crest factor of 5:1, which is between the 10:1 you can get
with a thermal converter and the 3:1 you could get with the early analog
multipliers. I don't know which it is.
Dave Wise
|
Re: 7562A Log Voltmeter/Converter
OK, these now look like project boxes to me, and very nice ones too, as they
would appear to have spent their life in a rack unit, so aren't bashed
around!
I would rather like some feet for them (they were in a rack adapter).
Each instrument originally had two feet (one at the front, one at the back).
The feet are a plastic bar about 7" long and 3/4" wide with detents at the
ends for a bail bar, and a push button in the middle with instructions
"Press then slide foot".
Does anyone by any chance have such they are prepared to part with?
I fear I don't know the part number, and a search on eBay didn't turn up any
HP feet that remotely matched.
Thanks
Dave
toggle quoted message
Show quoted text
-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of David Wise
Sent: 23 September 2009 17:56
To: 'hp_agilent_equipment@...'
Subject: RE: [hp_agilent_equipment] 7562A Log Voltmeter/Converter
The 7562A has a crest factor of 5:1, which is between the 10:1 you can get
with a thermal converter and the 3:1 you could get with the early analog
multipliers. I don't know which it is.
Dave Wise
|
Re: Step attenuator repair stuff uploaded in files section
I am not able to find the step attenuator repair document. Did it get pulled?
Thanks
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "lotharbaier" <lotharbaier@...> wrote:
I have uploaded a word file step attenuator repair, containg commented pictures which should help anyone who is trying to attempt to repair a step attenuator, this file is about 2.8MB so you need to save it to your loacal drive and then open it, i left it in word to keep it a living document, people may add content to this document (pictures, comments etc and then send it back to me for update)
|
Re: 7562A Log Voltmeter/Converter
The 7562A has a crest factor of 5:1, which is between
the 10:1 you can get with a thermal converter and the 3:1
you could get with the early analog multipliers. I don't
know which it is.
Dave Wise
toggle quoted message
Show quoted text
-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]On Behalf Of David C.
Partridge
Sent: Wednesday, September 23, 2009 9:47 AM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] 7562A Log Voltmeter/Converter
Thanks Dave,
I also found a write up about it in the October 1968 HP
Journal. I suspect
that the oven on the A5 board is for one (or both) arms of
the thermocouple
used for the RMS conversion. I've had one of them on for
about 1 hour, and
the Zero set has moved around a *lot* as it warmed up, but
the oven doesn't
appear appreciably warm to touch ??? but the PSU - now that
DOES run pretty
darn warm!
Accuracy +/- 0.5dB in AC mode (over most of the range 0.5Hz -
100kHz), +/-
0.25dB in DC mode
You're right they will make very nice project boxes :-)
Dave
|
FW: 7562A Log Voltmeter/Converter
Brief specs are on page 182 of the 1970 catalog you can download from www.hparchive.com .
Log converters are great for measuring voltages with
a large dynamic range. HP grouped them as accessories
to their Recording and Data Acquisition product lines -
to keep the pen from going off the chart.
Log converters of this era used the exponential I-V
characteristic of diode and transistor junctions to
get the logarithmic response. These have a large
temperature coefficient and must be ovenized if you
want any kind of accuracy.
I have an earlier instrument, the Moseley 60D, but
I haven't worked on it yet.
Dave Wise
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-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]On Behalf Of ArtekMedia
Sent: Wednesday, September 23, 2009 9:21 AM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 7562A Log Voltmeter/Converter
All discreet transistors and a few IC's ...Nice little power supply
...must be highly accurate as it has a "heater" (A5 Board)
recommends
20-30 minute warm up. Converts AC/DC -IN to LOG out 80dB
dynamic range,
auxiliary scope monitor . Hook two of them in series get LOG-LOG out
I'll send you a private email with scan of the description page.
Nice case for a project box
Dave & Lynn Henderson
ArtekMedia
Out-of-Print Technical Manuals
www.ArtekMedia.com
manuals@...
651-269-4265
|
Re: 7562A Log Voltmeter/Converter
Thanks Dave,
I also found a write up about it in the October 1968 HP Journal. I suspect
that the oven on the A5 board is for one (or both) arms of the thermocouple
used for the RMS conversion. I've had one of them on for about 1 hour, and
the Zero set has moved around a *lot* as it warmed up, but the oven doesn't
appear appreciably warm to touch ??? but the PSU - now that DOES run pretty
darn warm!
Accuracy +/- 0.5dB in AC mode (over most of the range 0.5Hz - 100kHz), +/-
0.25dB in DC mode
You're right they will make very nice project boxes :-)
Dave
toggle quoted message
Show quoted text
-----Original Message----- From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of ArtekMedia Sent: 23 September 2009 17:21 To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 7562A Log Voltmeter/Converter All discreet transistors and a few IC's ...Nice little power supply ...must be highly accurate as it has a "heater" (A5 Board) recommends 20-30 minute warm up. Converts AC/DC -IN to LOG out 80dB dynamic range, auxiliary scope monitor . Hook two of them in series get LOG-LOG out I'll send you a private email with scan of the description page. Nice case for a project box Dave & Lynn Henderson ArtekMedia Out-of-Print Technical Manuals www.ArtekMedia.com manuals@... 651-269-4265 David C. Partridge wrote: Pending anyone turning up a manual for these, what are these good for
and for that matter are they worth anything?
On another tack - are there any interesting things inside them (there
looks to be an ovenised "something" in there)?
Cheers
Dave Partridge
------------------------------------ Yahoo! Groups Links
|
Re: 7562A Log Voltmeter/Converter
The heater is almost certainly for the log element in the FB loop. The
temp. stability is needed to stabilize the thing.
-John
===============
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Show quoted text
All discreet transistors and a few IC's ...Nice little power supply
...must be highly accurate as it has a "heater" (A5 Board) recommends
20-30 minute warm up. Converts AC/DC -IN to LOG out 80dB dynamic range,
auxiliary scope monitor . Hook two of them in series get LOG-LOG out
I'll send you a private email with scan of the description page.
Nice case for a project box
Dave & Lynn Henderson
ArtekMedia
Out-of-Print Technical Manuals
www.ArtekMedia.com
manuals@...
651-269-4265
David C. Partridge wrote:
Pending anyone turning up a manual for these, what are these good for
and
for that matter are they worth anything?
On another tack - are there any interesting things inside them (there
looks
to be an ovenised "something" in there)?
Cheers
Dave Partridge
------------------------------------
Yahoo! Groups Links
|
Re: 7562A Log Voltmeter/Converter
All discreet transistors and a few IC's ...Nice little power supply ...must be highly accurate as it has a "heater" (A5 Board) recommends 20-30 minute warm up. Converts AC/DC -IN to LOG out 80dB dynamic range, auxiliary scope monitor . Hook two of them in series get LOG-LOG out
I'll send you a private email with scan of the description page.
Nice case for a project box
Dave & Lynn Henderson
ArtekMedia
Out-of-Print Technical Manuals
www.ArtekMedia.com
manuals@...
651-269-4265
David C. Partridge wrote:
toggle quoted message
Show quoted text
Pending anyone turning up a manual for these, what are these good for and
for that matter are they worth anything?
On another tack - are there any interesting things inside them (there looks
to be an ovenised "something" in there)?
Cheers
Dave Partridge
|
7562A Log Voltmeter/Converter
Pending anyone turning up a manual for these, what are these good for and
for that matter are they worth anything?
On another tack - are there any interesting things inside them (there looks
to be an ovenised "something" in there)?
Cheers
Dave Partridge
|
I've made my own using parts I got from Bill Perry (502-893-8724). He can supply all the connectors including the 13W3 connectors that have the coax contacts. He can also supply the contacts. Daniels does make the tool to remove the coax contacts, If I remember correctly it is a bit pricey ($40-$50). I can get the tool # if anybody is interested.
Geoff Greer KD8JSV
|
Yiu On Tony C