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Re: Thanks to all (P6015A)
Craig Sawyers
After due consideration, and considering it's one ofThat is entirely the correct decision! If you had said otherwise, I would have offered to take it off your hands ;-) My P6015 came with a half full can of freon, which has been in the fridge for the last couple of years to keep the vapour pressure in the can to about atmospheric and eliminate slow leakage. If I ever need to use the full capability of the probe, I will top it up. Craig |
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Re: P6015A HV Probe: Applications?
Craig Sawyers
If you can use it with a DMM it gives a very high input resistance'cept it is not intended for the purpose and will give a wierd result dependent on the input R of the DMM (which often changes between ranges). The correct division ratio only happens with a scope input R of 1M. The only way to go is to buy a high voltage probe for the DMM - which is designed for the purpose, like the Fluke 80K-40. Craig |
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Re: P6015A HV Probe: Applications?
Craig Sawyers
Freon, one of the Ozone layer destroying gasses.This needs to be put in context. The peak of ozone depelting CFC's was in the mid 80's, when R12 was used in all domestic and automotive refrigerators worldwide. In addition, other CFC's were used as degreasing solvents in the electronics industry (and others) in truly huge quantities (Freon TF). In total the global annual production of ozone depeting CFC's was the high hundred thousand tons during the decade before the Montreal Protocol (and later Kyoto agreement). Production of these materials is now down to truly tiny quantities - a few hundred tons per annum - largely for scientific purposes (such as spectroscopic applications) and very expensive and paperwork laden. In any event, the quantity of the rather specialised freon used in P6015 probes was entirely insignificant as compared with R12 and TF. Now that I'm started, it is kind of like the elimination of mercury batteries. Sure, in general mercury in batteries was a bad idea since it is leached out in landfills - but it means that the tiny market for replacement mercury cells for our Tek gear were likewise banned. Also, the entirely irresponsible banning of lead in solder - in which form the lead is not leachable and poses no environmental hazard. This is triply nonsensical when cadmium (a far more poisonous element, easily leachable) is still allowed in NiCd batteries, produced in the billions per annum, and lead is still used by the megaton globally in automotive batteries! Heaven save us from the thought police bureaucrats. <rant mode> = off Craig |
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Thanks to all (P6015A)
Thanks to all who provided insight on the P6015A HV probe.
After due consideration, and considering it's one of the newer type that uses a no-refill-required silicone compound instead of fluorocarbon liquid, I have decided to hang on to it. Happy tweaking. -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- kyrrin (at) bluefeathertech do/t c=o=m "Quid Malmborg in Plano..." |
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Re: P6015A HV Probe: Applications?
Don Black
If you can use it with a DMM it gives a very high input resistance (probably about a Gigohm?) and with the sensitivity of even basic DMMs will measure 200 volts full scale with resolution down to 0.1 volt. This gives very low loading on high impedance circuits for minimum error apart from any high voltage applications.
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Don Black. Bruce Lane wrote: Fellow tekkies, |
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TDS380 CH1 Module
normanshanks
Does anyone out there have a front end channel module for a TDS380
scope??? The schematic shows a AT206/B2565 module. It's a hybrid part. The input channel will measure -5.3vdc on the most sensititive ranges as measured by a DVM. The other channel is 0vdc when measured. Would be glad to pay a nominal fee +postage. Thanks......Norman |
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FREE PART!
Paul Kraemer
Tek group
I have a transformer pn 120-169 Recollection is that it was changed out of a small scope 30 or so years ago and didn't fix the problem. Don't remember what scope. This transformer is potted in a rectangular can. One winding was to filament of hv rectifier tube. There are 7 other wires arranged in two sets of windings. I drove the highest z winding with my audio generator at 10khz and got indications it is good. FREE for several dollars cost of postage. Paul |
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Re: P6015A HV Probe: Applications?
Geoff Blake
On Sat, 13 Sep 2008, ken chalfant wrote:
Hi ALL,Freon, one of the Ozone layer destroying gasses. There were two of the P6015 series probes, one designed for 25kV and the other designed for 40kV. I say designed because I know from personal experience that the 25kV probe arced at around 35kV, and that caused my boss to throw coffee all over his brand new suit. I kept out of his way for a week or two...... As I recall the new price was about USD 1,500.00. I use mine to evaluate the performance of gas laser charging andRadar Magnetron PFN's in my case. I don't think they have a very high frequency response - butI think that they were good enough for their day. I certainly suggest holding on to it. If you need it nothingThe P6015 series did no de-rate with frequency anything like as fast as the DMM probes. Geoff -- Geoff Blake G8GNZ located near Chelmsford, Essex, U.K. Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms Please avoid sending me Word or PowerPoint attachments. See <> ------------------------------------------------------------------------------ This E-mail and any attachment(s) are strictly confidential and is intended solely for the addressee(s). If you are not the intended recipient please notify <postmaster(at)palaemon.co.uk> and the sender by return and permanently delete the message. You may not disclose, forward or copy this E-mail or any of its attachments to any third party without the prior consent of the sender. ------------------------------------------------------------------------------ |
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Re: More Tek 494P GPIB help needed
John Miles
If the talk-only and listen-only switches are both off, and address 0 is
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reported by the analyzer even though the address switches are set to (say) address 31, then I'd look at the other end of the cable harness next. Someone may have damaged the cable or one of its header pins when R&R'ing the power supply. One thing you can try is temporarily shorting either side of R2034 (430 ohms) to ground on the GPIB board. See if the analyzer then reports address 1. Also, attach temporary test jumpers to R2038, R2032, and R2031 that you can use to verify that the talk-only and listen-only switches are open (R2031, 2032 both=TTL high), and that LF-or-EOI is closed (R2038 low). If it now reports address 1, the problem is the cable harness or one of its connectors, or an intermittent DIP switch. If it still reports address 0, and the other three switch lines are OK, then you have an addressing problem. Hang a scope on U2027 pin 1 to verify that the CPU actually tries to read the DIP switch at some point. No pulse activity here would call U1035 into question. Try to avoid manipulating the key on the sandwich connector while the power is on. On a 494P I was repairing recently, I realized I'd forgotten to close the connector after reinstalling the GPIB board. I turned the key to close the connector without bothering to power the analyzer down first, which seemed harmless enough since both endpoints already had power. It damaged the 40-pin TMS9914 interface chip and I had to buy a new one from the UK on eBay. I still don't see how that happened, looking at the schematic. -- john, KE5FX -----Original Message----- |
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Re: P6015A HV Probe: Applications?
Hi ALL,
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Actually I have several P-6015A HV probes. The older ones came with a can of some Fluorocarbon solution which could be put into the probe allowing for measurement of even higher voltages. I don't exactly remember how or why because I haven't used that feature in a long while. My newer P-6015's I believe will handle 40 KV and of course do not rely upon a Fluorocarbon solution to extend their range. As I recall the new price was about USD 1,500.00. I use mine to evaluate the performance of gas laser charging and pulse forming circuits as well as pre-ionizer circuits. Additionally, they are very handy working with Xenon strobe supplies. I don't think they have a very high frequency response - but again I'm not looking at the manual and have forgotten some of the specs that do not impact how I use the probes. I certainly suggest holding on to it. If you need it nothing else is going to do the job! I do believe it is intended for scope applications only and I have no idea if it is usable as a DVM HV probe. However, with nice 40 KV meter probes available for around USD 50.00 I wouldn't use my scope probe for that anyway. I hope this helps. Warm regards, Ken ----- Original Message -----
From: Bruce Lane<mailto:kyrrin@...> To: tekscopes@...<mailto:tekscopes@...> Sent: Saturday, September 13, 2008 10:59 AM Subject: [TekScopes] P6015A HV Probe: Applications? Fellow tekkies, I was cleaning up today, and came across an item I picked up from Boeing Surplus some years ago: A P6015A high-voltage probe in just about mint condition. I have vague memories of buying it because it was in such good condition, and because I had nothing that could do HV probing at the time. However, not having used it as yet, I'm curious as to what applications this probe was used for 'in the lab,' as it were. The immediate apps that come to my gray matter are checking the HV line of a CRT for ripple or noise, as well as safely monitoring the plate terminal in high-power RF amps (I'm thinking HF bands, kilowatt-class) for parasitics or other undesirables. However, not having that much experience in dealing with HV, I'm curious as to what other apps such a probe might serve. Thanks. -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- <> kyrrin (at) bluefeathertech do/t c=o=m "Quid Malmborg in Plano..." |
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Re: P6015A HV Probe: Applications?
Actually I have several P-6015A HV probes. The older ones came with a can of some Fluorocarbon solution which could be put into the probe allowing for measurement of even higher voltages. I don't exactly remember how or why because I haven't used that feature in a long while.The ones with the freon fill are P6015s, and the newer ones with the silicone gel fill are P6015As. Without freon, the P6015s are rated to 13kV. Otherwise, the rating is 20kVDC/40kV peak. I don't think they have a very high frequency response - but again I'm not looking at the manual and have forgotten some of the specs that do not impact how I use the probes.It's 75MHz, which is pretty impressive. P.S. For all kinds of test equipment specs see my website: |
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Re: P6015A HV Probe: Applications?
Hi, Chuck,
* REPLY SEPARATOR * On 13-Sep-08 at 13:09 Chuck Harris wrote: Hi Bruce,<snippage> something like that. Download the manual, you will find that the voltageThank you. I thought about that after pressing 'send.' ;-) You're right. Other than possibly developing a Tesla coil, as Dave suggested, I can't imagine what I might use it for otherwise. That being the case... I will wait to see what other responses might come up, and re-evaluate keeping it around. If I can't think of any valid reason to do so, now or future, I will probably offer it up for sale. Thanks again. -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- kyrrin (at) bluefeathertech do/t c=o=m "Quid Malmborg in Plano..." |
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Re: P6015A HV Probe: Applications?
Craig Sawyers
However, not having that much experience in dealingI used one back in the late '70s while developing a small pulsed carbon dioxide laser. Bit of a chewing gum and string affair. This used a high charging voltage (10kV or so IIRC) from an HV power supply via a chain of resistors in a length of plastic hose to a ceramic hockey puck array of capacitors. The laser was then pulsed by applying several hundred volts in a spike to pre-ionising wires in the discharge volume, and hence discharging the capacitor array into the gas. I used the P6015A to diagnose the discharge dynamics and optimise the performance of the laser. Craig |
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P6015A HV Probe: Applications?
Fellow tekkies,
I was cleaning up today, and came across an item I picked up from Boeing Surplus some years ago: A P6015A high-voltage probe in just about mint condition. I have vague memories of buying it because it was in such good condition, and because I had nothing that could do HV probing at the time. However, not having used it as yet, I'm curious as to what applications this probe was used for 'in the lab,' as it were. The immediate apps that come to my gray matter are checking the HV line of a CRT for ripple or noise, as well as safely monitoring the plate terminal in high-power RF amps (I'm thinking HF bands, kilowatt-class) for parasitics or other undesirables. However, not having that much experience in dealing with HV, I'm curious as to what other apps such a probe might serve. Thanks. -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- kyrrin (at) bluefeathertech do/t c=o=m "Quid Malmborg in Plano..." |
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Re: More Tek 494P GPIB help needed
Pierre-Fran?ois
Hi,
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I remember now that in the late 90's I'd a similar problem with my 496P. I was using the Tektronix software GRASP and I remember well that I was obliged to leave all the back panel switch to OFF except the ones concernind the GPIB address. When I was switching the dip switches to Talk or Listen the analyser did responded to the software. All the switch had to remain off except the address! Don't as me why I don't have anymore this rig. May be the software is still somewhere on my pc or the archive! Have a wonderfull week end trying to make it working! pf, F5BQP ----- Original Message -----
From: John Pavelich To: TekScopes@... Sent: Saturday, September 13, 2008 2:09 PM Subject: [TekScopes] More Tek 494P GPIB help needed Hi Thanks for all the helpful suggestions I received earlier but my Tek 494P spectrum analyzer GPIB still does not respond and I could use some help. I took the GPIB board out of the unit (fairly easy job) tested the DIP switch with a multi-meter, it seems to respond fine. I cleaned the ribbon cable connectors and they seem ok. I checked for DC power, and I have about 5 volts to the GPIB board. However the 494P still does not respond to any GPIB switch settings. What would the group suggest that I do next? Is there a way to test for signals on the GPIB board to see if the board is functioning? I assume that if I can test the GPIB board and it tests ok, then the problem is somewhere between the board and the analyzer - but where? Cheers John __________ Information NOD32 3439 (20080912) __________ Ce message a ete verifie par NOD32 Antivirus System. |
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More Tek 494P GPIB help needed
Hi
Thanks for all the helpful suggestions I received earlier but my Tek 494P spectrum analyzer GPIB still does not respond and I could use some help. I took the GPIB board out of the unit (fairly easy job) tested the DIP switch with a multi-meter, it seems to respond fine. I cleaned the ribbon cable connectors and they seem ok. I checked for DC power, and I have about 5 volts to the GPIB board. However the 494P still does not respond to any GPIB switch settings. What would the group suggest that I do next? Is there a way to test for signals on the GPIB board to see if the board is functioning? I assume that if I can test the GPIB board and it tests ok, then the problem is somewhere between the board and the analyzer - but where? Cheers John |
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2445 vs 2465 scopes
oldtestgear
After spending a lot of time messing around trying to get my 2465
working again without success, I am wondering what my options are. The 2445 works really well & triggers reliably beyond 200MHz. Can the 2465 preamps be used in the 2445 to extend the frequency response of the 2445? Does anyone have any thoughts about this idea or any alternative suggestions? Phil |
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7CT1N failure
Jerry Massengale
Greetings,
? I just recently got my 7CT1N working with my 7B70 and a 7A26 in my 7603. Yesterday I went to try it out with a new adapter and found that no trace is being generated. The dot can be adjusted to the lower left but no traces occur as the collector/drain control is increased. The dot moves to the right when the pnp button is pushed but does not move to the upper corner. The dot responds to the verticle position knob on the 7A26, the horizontal position knob and the variable knobs on the 7B70 but not the position knob on the 7CT1N. I cleaned the switches last night but no change. The adapter is not present when these test are made. ? Where is a good place to start? my 7K extender is not very good. The scope functions correctly in normal operation with the 7B70 as a time base. ? Thanks, ? Ike is coming tomorrow. |
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Re: selenium rectifiers in a 317
If you look at the BAMA and Kurt's different schematics of the 317 PS, the B+/plate supply?winding voltages are different.? The newer diode version is about 10 volts RMS less per winding.? The BAMA manual also states a change in the power transformer P/N at S/N 341.
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? Jim --- On Fri, 9/12/08, Stan & Patricia Griffiths <w7ni@...> wrote:
From: Stan & Patricia Griffiths <w7ni@...> Subject: RE: [TekScopes] selenium rectifiers in a 317 To: "'tom jobe'" <tomjobe@...> Cc: "TekScopes" <TekScopes@...> Date: Friday, September 12, 2008, 4:49 AM Hi Tom and the rest of you guys, Typically, new selenium rectifiers have a larger internal resistance than new silicon rectifiers and internal selenium rectifier resistance gradually increases with time. When the first 317s were produced with seleniums, the power transformer windings were designed to take the larger internal resistance of selenium rectifiers into account and therefore had a few more turns on each secondary winding than would have been necessary if silicon rectifiers had been available at the time these early instruments were designed and built. When the 317 was switched over to silicon rectifiers on the production line, a new power transformer was necessary with slightly lower secondary voltages because the silicon diodes had lower internal resistance than the seleniums they replaced. No dropping resistors were necessary because of the redesign of the power transformer. As seleniums age and their internal resistance goes up, the voltage drop, especially at low line voltages, due to this increased resistance is enough to prevent the power supply from regulating properly and eventually the scope will not even work at normal line voltages. Tektronix made modification kits available for virtually ALL early scopes that originally used selenium rectifiers to convert them to silicon diodes. Dropping resistors were a necessary part of these kits because the power transformer was designed to provide correct values of AC voltage to power seleniums, but NOT silicon rectifiers. If the manual on BAMA shows silicon diodes, then it shows the schematic of a later instrument that came from the factory with silicons and it will have the newer power transformer in it and will not need dropping resistors. There is no manual that will show you the necessary dropping resistors because no scope came off of the production line with the old transformer powering the newer silicon diodes. The available schematics that WILL show you this data is part of the instructions that came with the modification kit for upgrading an early 317 with seleniums to one with silcons. I have these kit instructions on microfiche and for a reasonable fee, I can go through the effort to convert the microfiche images to hardcopy paper and make a copy for you. Stan _____ From: TekScopes@yahoogrou ps.com [mailto:TekScopes@yahoogrou ps.com] On Behalf Of tom jobe Sent: Thursday, September 11, 2008 6:20 AM To: TekScopes Subject: Re: [TekScopes] selenium rectifiers in a 317 Hello Kurt, The 317 manual on BAMA . <. edebris.com/ manuals/tek/ 317/> edebris.com/ manuals/tek/ 317/ shows only silicon diodes used for the 3 full wave bridges, in the "Electrical Parts" listing. So maybe the schematic of the LV power supply will have everything you need to know, to convert from Selenium rectifiers? The service manual is in DjVu format but it is very usable, and there is also a 317 calibration document on BAMA as well. tom jobe... PS three viewers for DjVu files are available free from: . <. org/resources/> org/resources/ I use the "Lizardtech" viewer, and it works great on my Windows machine. ----- Original Message ----- From: "Kurt" <sipespresso@ <mailto:sipespresso %40yahoo. com> yahoo.com> To: <TekScopes@yahoogro u <mailto:TekScopes% 40yahoogroups. com> ps.com> Sent: Wednesday, September 10, 2008 9:24 PM Subject: [TekScopes] selenium rectifiers in a 317 Gentlemen,_._,___ |
Bruce Lane