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Re: 332A balance pots
i think thats even worse
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----- 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 |
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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: 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) |
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Foot Assy for (Re: 7562A Log Voltmeter/Converter)
ArtekMedia
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
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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 |
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Re: 7562A Log Voltmeter/Converter
David C. Partridge
OK, these now look like project boxes to me, and very nice ones too, as they
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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 |
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Re: Step attenuator repair stuff uploaded in files section
I am not able to find the step attenuator repair document. Did it get pulled?
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Thanks --- In hp_agilent_equipment@..., "lotharbaier" <lotharbaier@...> wrote:
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Re: 7562A Log Voltmeter/Converter
The 7562A has a crest factor of 5:1, which is between
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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 -----Original Message----- |
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FW: 7562A Log Voltmeter/Converter
Brief specs are on page 182 of the 1970 catalog you can download from www.hparchive.com .
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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 -----Original Message----- |
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Re: 7562A Log Voltmeter/Converter
David C. Partridge
Thanks Dave,
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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 -----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 ------------------------------------ Yahoo! Groups Links |
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Re: 7562A Log Voltmeter/Converter
J. Forster
The heater is almost certainly for the log element in the FB loop. The
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temp. stability is needed to stabilize the thing. -John =============== All discreet transistors and a few IC's ...Nice little power supply |
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Re: 7562A Log Voltmeter/Converter
ArtekMedia
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
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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 |
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HP 141T extender cables
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 |
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Re: 332A balance pots
ArtekMedia
Danger Will Robinson!...Danger!
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I am assuming this is a metal case pot ( I've not seen the beast) ....if so "drilling" a small could introduce small conductive particles inside the pot .. got to be a better way Dave & Lynn Henderson ArtekMedia Out-of-Print Technical Manuals www.ArtekMedia.com manuals@... 651-269-4265 arthurok wrote: drill small holes in the cases and squirt in some caig calilube |
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Re: HP 7562A Log Voltmeter/Converter Manual
ArtekMedia
Dave
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I have it ....contact me at manuals@... for details ......you can have either the original HP manual or a PDF copy Dave Artekmedia Dave & Lynn Henderson ArtekMedia Out-of-Print Technical Manuals www.ArtekMedia.com manuals@... 651-269-4265 david_c_partridge wrote: Does anyone have a manual for these? |
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Re: 332A balance pots
drill small holes in the cases and squirt in some caig calilube
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----- Original Message -----
From: mike To: hp_agilent_equipment@... Sent: Wednesday, September 23, 2009 9:35 AM Subject: [hp_agilent_equipment] Re: 332A balance pots Well it's just that either the last guy who cleaned them out epoxied them shut or they came glued like that from the factory. Mine is only suffering slight mistracking - needs a good clean but getting it open will be the trick... |
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Re: Please Give Your Feed back about our product . It Really help ful to busines
Please, kick him strongly.
Quoting "victor.silva" <daejon1@...>: Spammer should be kicked out! ------------------------------------------------------------------------- A FCUP utiliza o sistema open source de webmail Horde/IMP (www.horde.org) Visite: |
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