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Re: Acquisition of 535A and 581 - info for a 7000-er?
Bill R
Christian,
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BAMA has the 585 manual. A 581 is like a 585 but has only one timebase. The vertical amps will be the same, and the power supplies will be very close. The one sweep on the 581 will be the same as "A" sweep on the 585. Right: To use letter series plug-ins with a 581 you need an adapter plug-in, type 81. The plug-in of choice for the 581 is the type 82, a dual channel. Single channel is type 86. Both 581 and 585 came in "A" versions. Good luck! Bill R Christian A Weagle wrote: Good day, |
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File - Posting Rules
Please edit any posts/replies to the list to
minimize quoted material to that required for continuity. Please do not send personal replies to the list. List replies go to the original sender by default. If you want to also reply to the list, use Reply-to-all (or whatever it's called in your mailer), or manually add the TekScopes address. Do this if your reply would be of interest to the list. Otherwise, just reply to the sender. Those congesting the list with with either of the above may have posting rights revoked. Only by following these simple rules will we have a "clean" archive. They also reduce inbox clutter, make digests much nicer to read, improve searches, and reduce the chance of having old messages deleted. To post to the group, mail to: TekScopes@... I occasionally get emails meant for the group mistakenly sent to TekScopes-owner@...! I just delete these, so please watch where you're sending... If you post or have posted to the Photos section, please make sure your files are fairly small (<100K). See the bottom of this message for further instructions. If you do not wish to belong to TekScopes, you may unsubscribe by sending an email to TekScopes-unsubscribe@... You may also visit the Yahoo web site to modify your subscription: Check out the files, links, and photos sections, and remember, you can search the group's archives from its home page, or when reading messages. The group's home is at: Regards, Michael Dunn Listowner, TekScopes Keeping Photos Small: There's no point uploading large images to the photos section, as Yahoo severely limits the size and quality that others can view them at. I reserve the right to delete oversize files without warning. Therefore: I would ask anyone who has uploaded large (>100K) files (you can see file sizes by selecting list instead of thumbnail view) to either: 1. Delete the full-sized version via Yahoo by first viewing it. There is then a link (top-center) that allows deletion. 2. Replace it with a reduced-size version. 3. Delete it. |
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slightly OT: HP 3589A Spectrum / Network Analyzer: Trace Math syntax
martin_u_fischer
Hello TekScope Community,
apologies for the slightly OT; please admit the following questions: I am looking for informations about Trace Math in the HP 3589A Spectrum / Network Analyzer. The Product Data Sheet merely mentions some characteristics of this feature. The HP 3589A Operator?s Guide downloaded the from the Agilent website doesn?t even mention this feature. Does anybody have any further informations about or experience with Trace Math syntax in this Model? Or do I miss a dedicated manual covering this topic? Any hint will be highly appreciated. Regards Martin mailto:Martin.Fischer@... |
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Re: Birdies on a 492....what's normal?
John Miles
There should be no birdies whatsoever except for the big one at 0 Hz. You
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have a problem (possibly bad cabling in the front end, although what local signals would be coming through at 41 MHz and 300 MHz, I don't know...) Interrupt the RF signal path (as recommended in my earlier reply) until you see where they're coming from. -- john, KE5FX -----Original Message----- |
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Re: Birdies on a 492....what's normal?
Luis Cupido
Exactly, that is why I'm asking.
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because for no input my 492 is absolutely clean in the range 0 to 1.8GHz. lc. ----- Original Message -----
From: "arthurok" <arthurok@...> To: <TekScopes@...>; "Luis Cupido" <cupido@...> Sent: Thursday, February 01, 2007 5:26 PM Subject: Re: [TekScopes] Birdies on a 492....what's normal? i normally look for birdies with no input "shorted with a terminator" when checking a radio receiver or spec ana |
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Re: Birdies on a 492....what's normal?
arthurok
i normally look for birdies with no input "shorted with a terminator" when checking a radio receiver or spec ana
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----- Original Message -----
From: Luis Cupido To: TekScopes@... Sent: Thursday, February 01, 2007 11:21 AM Subject: Re: [TekScopes] Birdies on a 492....what's normal? Chris, With what signal at the input ? Luis C. ct1dmk. ----- Original Message ----- From: "Chris Johnson" <strangequark65@...> To: <TekScopes@...> Sent: Thursday, February 01, 2007 4:55 PM Subject: [TekScopes] Birdies on a 492....what's normal? > I've got a 492 that I haven't had for very long and I'm still > exploring the possibilities with it. It has options 1,2, and 3. > > > It's a very clean performer and seems to meet its sensitivity specs > and is reasonably close to calibrated. > > > I do notice a few birdies in it, and while I don't expect any spetrum > analyzer to be entirely free of birdies, I'd just like to know if the > ones I'm seeing in this unit are about normal. > > > Of course it has some noise below 100 MHz. I see a spur at about 34 > MHz that's about 20 dB above the noise floor with the video filter set > to narrow. > > At 41 MHz, there's another spur that's about 15 dB above the noise floor. > > At 50 MHz, +25 dB. > > At 69 MHz, +8 dB. > > At 75 MHz, +12. > > At 85 MHz, +19 > > At 93 MHz, +20. > > At 99 MHz, +18. > > At 100 MHz, +19. > > There's a big one at 300 MHz, +25. > > At 350 MHz, +20. > > At 400 MHz, +10. > > At 500 MHz, +10. > > Below 100 MHz, there are smaller spurs between the larger ones, > typically less than 10 dB above the noise floor. > > Above 500 MHz, it's very clean. > > The apparent magnitude of the spurs does vary somewhat according to > the span and resolution in use. > > All figures reported are in minimum noise mode with the ref level and > attenuation adjusted to as to yield the largest apparent magnitude > of the spurs. > > > So is this about right for a 492 or is it more in need of calibration > (or even repair) than I thought? > > > CJ > > > > > > Yahoo! Groups Links > > > |
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Re: Birdies on a 492....what's normal?
Luis Cupido
Chris,
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With what signal at the input ? Luis C. ct1dmk. ----- Original Message -----
From: "Chris Johnson" <strangequark65@...> To: <TekScopes@...> Sent: Thursday, February 01, 2007 4:55 PM Subject: [TekScopes] Birdies on a 492....what's normal? I've got a 492 that I haven't had for very long and I'm still |
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Birdies on a 492....what's normal?
Chris Johnson
I've got a 492 that I haven't had for very long and I'm still
exploring the possibilities with it. It has options 1,2, and 3. It's a very clean performer and seems to meet its sensitivity specs and is reasonably close to calibrated. I do notice a few birdies in it, and while I don't expect any spetrum analyzer to be entirely free of birdies, I'd just like to know if the ones I'm seeing in this unit are about normal. Of course it has some noise below 100 MHz. I see a spur at about 34 MHz that's about 20 dB above the noise floor with the video filter set to narrow. At 41 MHz, there's another spur that's about 15 dB above the noise floor. At 50 MHz, +25 dB. At 69 MHz, +8 dB. At 75 MHz, +12. At 85 MHz, +19 At 93 MHz, +20. At 99 MHz, +18. At 100 MHz, +19. There's a big one at 300 MHz, +25. At 350 MHz, +20. At 400 MHz, +10. At 500 MHz, +10. Below 100 MHz, there are smaller spurs between the larger ones, typically less than 10 dB above the noise floor. Above 500 MHz, it's very clean. The apparent magnitude of the spurs does vary somewhat according to the span and resolution in use. All figures reported are in minimum noise mode with the ref level and attenuation adjusted to as to yield the largest apparent magnitude of the spurs. So is this about right for a 492 or is it more in need of calibration (or even repair) than I thought? CJ |
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Acquisition of 535A and 581 - info for a 7000-er?
Good day,
A friend of mine has offered me two tube scopes of unknown provenance, he believes however that they are not working. They are Type 581 Serial #001067 Type 535A Serial #025668 BAMA has provided me with manual for the 535A (even seems to be the right vintage), but I came up short on the 581 - any pointers? I don't know what/if any plugins will be coming (the scopes are currently a long way away from both of us). This will be my first foray into the earlier offerings from Tek. I understand that both of these scopes will use letter and 1-series plugins, the 581 needing the 81 adapter. Any other gotchas? I will of course peruse the archives, but I would welcome any tips useful to someone used to working on 7000-era gear. Ahh, yes, I know that the voltages tend to be a bit higher, and that I probably could stand to get a 100x probe! |
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Re: In search of the "Safest" bench test setup
But the charge on even a pretty large CRT, at least in the olden
times, before flatscreens, had pretty impressive HV like 25 kV, and you can get a nasty surprise, but not worse. After all, it's DC,and the capacitance isn't all that large. Now, I know this is going to provoke a lecture and thread ad infinitum (you know who you are), but really, we did take at least *some* care, like making sure a five tube ac/dc set really had the chassis at neutral and that neutral and hot weren't interchanged. Of course you're going to get shocked if you reach stupidly into a power supply that has a 300-0-300 VAC transformer secondary, but if you're lucky, it'll be the dc which *will* fling you across the room, not lock your muscles and kill you. People learn fast from such experiences, at least those who didn't grab the transformer secondary with both hands. I know that I was immensely pleased to have the transistor come along just at the right time to spare me shocks but mostly wiring the accursed filaments. Regards, Jonathan --- In TekScopes@..., Kuba Ober <ober.14@...> wrote: plan to1. With all power off to everything, discharge the test point I capacitor.probe to ground. In other words , I treat it like a big capacitor. AsYou're right, but it doesn't have to be big, or even a designated Mind the parasitics! The CRT with its parastic anode capacitance isenough to zap you big time. |
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Re: TM5006
There is no surplus stores in the Charleston area that have electronic equipment. There will be a hamfest in the Charleston area Feb 3, 2007.
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73 Glenn WB4UIV At 04:15 PM 01/31/07, arievanstappen wrote:
I am searching for a TM5006 rack and they are at this moment often on |
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Re: In search of the "Safest" bench test setup
Michael Bender
Kuba Ober wrote:
Also while the "shock" might not kill you, falling backwards1. With all power off to everything, discharge the test point I plan toYou're right, but it doesn't have to be big, or even a designated capacitor. Mind the parasitics! The CRT with its parastic anode capacitance is enough to zap you big time. or bumping into something from your reflexive action might cause you to break your neck or get impaled on something, or have something big fall on top of you. mike |
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OT - Need Schematic For B&K 3050 Audio Generator
Hi Folks,
My instruction manual for my B&K 3050 sine/square generator is missing the schematic. If it's like my other B&K test equipment, the schematic is generally just a folded loose sheet inserted into the back of the manual. Anyway, mine is missing. Can anyone help me out? Thanks, Mike, WB0LDJ |
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Re: 496P Scams on eBay
Chuck Harris
Kuba Ober wrote:
Read again: "but not received payment or shipped, a lovely..."My assumption is that they are hijacking accounts.Why did you ship before being paid?! I'd like to amplify one thing further. Everything that is needed for aThe bidder was from Bulgaria; he called and everything. His website wasI don't know where's the problem in the US mentality about not giving out the bank account numbers. If your bank is so bad that someone just knowing your address and account number can do unauthorized transactions, you're gonna be screwed anyway -- look for a better bank. wire transfer *into* your account is on the bottom of your check. There really isn't any reason to worry. Your bank will *not* wire anything out of your account unless you have prearranged the transaction. You can do it by phone, but it will require you to know all of the magic numbers and runes both they, and you know about you. -Chuck Harris |
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TM5006
arievanstappen
I am searching for a TM5006 rack and they are at this moment often on
ebay. The only problem is the transportcost which will is very high for sending to Europe. Does somebody know a TM 5006 rack for sale in the neighbourhood of Charleston SC (which I will visit next week). Also an address from a electronic surplus store in Charleston SC is welcom |
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Re: Geography.. was 496 Scams
J Forster
[snip]
The bidder was from Last time I looked, the Baltic states were Estonia, Lithuania, and Latvia. Bulgaria is in the Balkans. -John |
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Re: 496P Scams on eBay
Kuba Ober
My assumption is that they are hijacking accounts.Why did you ship before being paid?! The bidder was fromI don't know where's the problem in the US mentality about not giving out the bank account numbers. If your bank is so bad that someone just knowing your address and account number can do unauthorized transactions, you're gonna be screwed anyway -- look for a better bank. In Europe, bank account numbers appear on stationery -- next to the address, along with VAT/EIN numbers etc. To do a transaction, you either have to go online and have the credentials (password & token-generated number), or have a proper ID and go to the branch. Easy. BTW, you do know that you can instantly open an empty "receive-only" online checking account at most banks? Who said you can only have one checking? Cheers, Kuba |
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Re: In search of the "Safest" bench test setup
Kuba Ober
1. With all power off to everything, discharge the test point I plan toYou're right, but it doesn't have to be big, or even a designated capacitor. Mind the parasitics! The CRT with its parastic anode capacitance is enough to zap you big time. Cheers, Kuba |
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