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Re: 7D02 Logic Analyzer
Kuba Ober
On Saturday 03 February 2007 00:37, you wrote:
I have a Tektronix 7603 mainframe, with a 7D02 logic analyzer plugin.I know nothing about it, but here's a hint: the 7D02 will surely have some software in the personality module -- probably the disassembler or dissassembly tables, etc. I don't know whether there is any software in the main unit or not. I'd assume there should be *some*. Anyway, this doesn't look too right. If you have the manual, I'd suggest to start troubleshooting it per the manual. The manual should also tell you what's the expected behaviour w/o the PM. If you need the manual, let me know off list. Cheers, Kuba |
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Re: old fashioned 535 - first start after 35 years
As far as I know there is only one delay relay. It kicks in after
the tubes have had a chance to warm. The only time mine ever kicked out was when the thermal protection tripped, which it will do fairly quickly without the fan, with the cover off. Check the regulated voltages of the low voltage power supply. That is very important. Everything is referenced off the -150v supply. There are some .01 capacitors across the precision voltage dividers that probably leak badly. And speaking of capacitors, these scopes were originally full of Sprague "black beauty" paper capacitors. They will be black plastic things with a solder blob at one end. All of them should be replaced. The 535 uses a high voltage tripler made of 3 tubes. The capacitors which charge to make the high voltage were probably originally black beauties. If they are still there they are surely bad. John |
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Re: old fashioned 535 - first start after 35 years
faustian.spirit
--- In TekScopes@..., "Petrosilius Zwackelmann"
<michael.petereit@...> wrote: so far but try what you suggested. start after around 1 minute a relais was working i the back, below the big fan. After another 30 sec the relais release with a big spark. I don't think it should release until you switch off the power. This must be the relay which switches on the anode voltages after the tubes are at working temperature. BTW does somebody know how many different thermal delay tubes there are? but do not relase the contact any more. I assume some capacitors might be charged to high and keep voltage. out . startIt may be as far back as two years ago but there was a lot ofdiscussion. be outtracing the circuits for bad electrolytic.. Many will suggest that --of business till you find a doaner scope |
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Re: old fashioned 535 - first start after 35 years
Dave,
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I fond that thread but it didn't gave that conclusion. I used alcohol for slight mud, this scope was placed in a dirty an humid cellar for years without it's coverage. The aluminium is best cleaned by caustic potash but it will eat up tin too. Thus I tried with a industrial cleaner which worked pretty good. In the area of the high voltage transformator I didn't used anything else than alcohol. I was afraid of getting shorts by using chemical stuff. I try to build up ths voltage divider to measure the high voltage. BR, Michael -------- Original-Nachricht -------- Datum: Sun, 04 Feb 2007 14:27:26 -0600 Von: Artek Media <manuals@...> An: Michael Petereit <michael.petereit@...>, TekScopes@... CC: Betreff: Re: [Tekscopes] old fashioned 535 - first start after 35 years Michael --
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Re: old fashioned 535 - first start after 35 years
Petrosilius Zwackelmann
Well, all tubes below the CRT are working. I didn't checked the CRT so far but try what you suggested.
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Btw: The startup behaviour of the scope is strange. On the first start after around 1 minute a relais was working i the back, below the big fan. After another 30 sec the relais release with a big spark. Now the startup is different. The relais is working after 30 seconds but do not relase the contact any more. I assume some capacitors might be charged to high and keep voltage. I'll try agai once I'm back home tonight. BR, Michael -------- Original-Nachricht -------- Datum: Mon, 05 Feb 2007 02:35:04 -0000 Von: "m38a1_1962" <m38a1_1962@...> An: TekScopes@... CC: Betreff: [TekScopes] Re: old fashioned 535 - first start after 35 years Before you go too far with the chassis cleaning and wholesale tube --
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211 Scope Retirement
I was recently given a tek 211 portable scope in bad condition. It
will not be repaired, as i'm a tube type guy, but will be converted to a scope design of my own, for monitoring purposes. If anyone has any info on the CRT, it would be greatly appreciated, as i've been unable to glean the heater voltage from the manual. If someone with a working 211 could measure the voltages on all eleven CRT pins that would be even better, as it gives me a operating point to start from. thanks, Jake |
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Re: old fashioned 535 - first start after 35 years
Before you go too far with the chassis cleaning and wholesale tube
testing, check and repair the low voltage power supplies first (be especially wary of the bypass capacitors across the precision voltage divider resistors). If the voltages are all in tolerance, look at the high voltage rectifier tubes under the top HV cover to see if their filaments are glowing. This will tell you if the HV oscillator is working. If they are glowing, the CRT filament should also be glowing. You won't be able to fix anything else until the power supplies are working. BAMA has a 535_545 manual listed for free download if you are in for some troubleshooting. Good luck. --- In TekScopes@..., Artek Media <manuals@...> wrote: discussion.
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Re: Tek 492 SA experts, can you answer these questions?
arthurok
you might be able to just take the "video" output from the detector and run it into an audio amp
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for fm just demodulate it by slope detection "tune off peak and use a fairly narrow filter" ----- Original Message -----
From: Chris Johnson To: TekScopes@... Sent: Sunday, February 04, 2007 2:05 PM Subject: [TekScopes] Tek 492 SA experts, can you answer these questions? I'm learning my way around the 492 and don't yet have manuals for it. (I'd rather get print manuals than a CD copy...got a set for sale?) I'd like to be able to use the 492 as a receiver for AM and FM transmissions, to be able to hear them. My 492 has options 1,2, and 3, so the only IF option I have to work with is the 10 MHz IF output. I need to know what are the output specs for the IF output, so I can determine how much gain I'm going to need. I plan to preamplify the IF output, feed it through a detector/demodulator, and then need to add more gain to bring it up to a level suitable for further processing, including audio band filtering and level adjustment. I would PRESUME that the correct mode to run in will be zero span, is this right? Not having actually used an analyzer in this application before, I'd appreciate it if anyone could give me a how-to guide on the setup and configuration of the analyzer and outboard equipment. If I'm wrong about how to do it, I'd rather know before I get started. CJ |
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Re: Tek 492 SA experts, can you answer these questions?
arthurok
deane kidd might have the paper manuals
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----- Original Message -----
From: John Miles To: TekScopes@... Sent: Sunday, February 04, 2007 2:29 PM Subject: RE: [TekScopes] Tek 492 SA experts, can you answer these questions? I haven't messed with the 10 MHz output, but try feeding it into a general-coverage receiver and see what the levels are like. Zero span will definitely be needed. For paper manuals, QService is great -- they are in Greece but they ship quickly, and the quality level is essentially OEM-grade. Go here: and enter 492 into the store search field. Make sure the serial # range matches yours (the major editions are either pre-B030000 or post-B030000). Can't say enough good things about the reprints I've ordered from them. -- john, KE5FX > -----Original Message----- > From: TekScopes@... [mailto:TekScopes@...]On > Behalf Of Chris Johnson > Sent: Sunday, February 04, 2007 12:06 PM > To: TekScopes@... > Subject: [TekScopes] Tek 492 SA experts, can you answer these questions? > > > I'm learning my way around the 492 and don't yet have manuals for it. > (I'd rather get print manuals than a CD copy...got a set for sale?) > > |
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Re: Tek 528 Waveform monitor, what is it?
Chris Johnson
As it's strictly for monitoring NTSC standard video signals only, and
can't be used for high definition signals at all, it's of little use and will only become less useful as time goes on. Only those who have a need to test legacy NTSC video systems will find it useful. |
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Tek 576 vs 577
J Forster
Basically, the 576 is 7000 technology, the 577 is 5000.
The 576 is bigger, MUCH heavier, and capable of more test current. The 577 has opamp and voltage regulator test fixtures which (I think) the 576 lacks. Either is a fine choice IMO. -John Hello! After some time looking around, I have finally bought a 577/D1 curve tracer with the standard 177 fixture. I wonder which are the differences with the more expensive 576. What would I be missing? Regards, JOSE |
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Tek 576 vs 577
Jose V. Gavila
Hello!
After some time looking around, I have finally bought a 577/D1 curve tracer with the standard 177 fixture. I wonder which are the differences with the more expensive 576. What would I be missing? Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) - Loc: IM99SM Vintage Radio: Vintage Test Equipment: European Boatanchors List: |
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Re: Tek 528 Waveform monitor, what is it?
Tomas Larsson
Ok, thanks.
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I thought it was something like that, obviously not that useful instument, unless you are doing video then. With best regards Tomas Larsson Sweden Excellent and cheap hosting, use Verus Amicus Est Tamquam Alter Idem -----Original Message-----__________________________________________________ Anv?nder du Yahoo!? ?r du tr?tt p? spam? Yahoo! E-post har det b?sta spamskyddet som finns |
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Tek 528 Waveform monitor, what is it?
J Forster
"Tomas Larsson" wrote:
Hi group. Stumbled across a Tek 528 Waveform monitor. What is it, and what was it's primary use? Cant find any info more than pic's. With best regards Tomas Larsson Sweden It's basically a specialized scope for looking at TV signals. It is likely NTSC but I think other versions (PAL and SECAM) were made. Triggering is from an internal TV sync separator and the graticle is likely an IRE scale. There are filters in the vertical channel so you can look at the full signal, luminance, and chrominance (wideband, LP, 3.58 BP). -John |
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Re: Tek 528 Waveform monitor, what is it?
Bill R
Tomas,
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It was used by TV stations to monitor video waveforms. Made in NTSC and PAL versions, I think. Bill Roberts Tomas Larsson wrote: Hi group. |
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Re: Tek 528 Waveform monitor, what is it?
Tomas
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The Tektronix 528 waveform monitor is used in the TV industry to monitor the video waveform. The scope is graduated in IRE. A proper waveform will have 100 IRE of video and 40 IRE of sync. The scope can display two frames of video (what we normally leave ours set at) or a single frame of video. You can use the scope to tell if the video frequency response of the device that the scope is monitoring is correct. It gives an indication of the chroma level. The only use I know of for the scope is to monitor video. The scope is fairly old. The CRT is unique to this scope. I work at a TV station and use different vintage waveform monitors at the station. Hopefully all that I have stated is true for this monitor. Some waveform monitors allow you to view a single line of video. 73 Glenn WB4UIV At 03:28 PM 02/04/07, Tomas Larsson wrote:
Hi group. |
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Re: Tek 492 SA experts, can you answer these questions?
John Miles
I haven't messed with the 10 MHz output, but try feeding it into a
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general-coverage receiver and see what the levels are like. Zero span will definitely be needed. For paper manuals, QService is great -- they are in Greece but they ship quickly, and the quality level is essentially OEM-grade. Go here: and enter 492 into the store search field. Make sure the serial # range matches yours (the major editions are either pre-B030000 or post-B030000). Can't say enough good things about the reprints I've ordered from them. -- john, KE5FX -----Original Message----- |
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