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Re: Foot Assy for (Re: 7562A Log Voltmeter/Converter)
I spoke casually; I was just distinguishing between the three (known to me)
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System I sizes. An example of narrow is the 400C/E/F/G. Then you have the medium size, which is a bit more than 1/3-rack. You can't fit three, but two leave a big gap. (And finally of course the full-rack size.) Sorry, Dave Wise -----Original Message----- |
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Re: Foot Assy for (Re: 7562A Log Voltmeter/Converter)
David C. Partridge
Dave, you describe these as 1/3 wide, but only two fit into a 19" rack
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adapater (they came out of one with p/n 5060-8764). Or am I missing something here? Dave -----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
David C. Partridge
Arthur, no I'm not in the USA. I'm based in the UK.
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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 -----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?? |
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Re: Foot Assy for (Re: 7562A Log Voltmeter/Converter)
That cabinet design is known as System I, as are the feet,
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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 -----Original Message----- |
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Re: 332A balance pots
ArtekMedia
to be sure... that makes conductive dust
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Dave & Lynn Henderson ArtekMedia Out-of-Print Technical Manuals www.ArtekMedia.com manuals@... 651-269-4265 arthurok wrote: i think thats even worse |
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Re: 7562A Log Voltmeter/Converter
dont scrap it
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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?? ----- 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 > > |
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Re: 332A balance pots
i think thats even worse
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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 |
Yiu On Tony C
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