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No one going to chime in on the TAS485?
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sknaugler
--- In TekScopes@..., "sknaugler" wrote:
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¿ªÔÆÌåÓýLooking back at the archives I don't see much on the TAS485. Have you done
a search of the archives? I only saw 17 messages related to it. Artekmanuals.com
would be a starting place to search out a service manual if one exist.
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If I was facing your problem, I would look for or build a differential to
single ended amplifier pair to get the signals into a two channel scope. Op amps
in the 100 MHz range exist for not much money. There are also Tek differential
probes available. That or just get a 7704A or such.
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Regards,
Tom
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sknaugler
I'm leaning more toward the 7000 series. I just haven't found out much about the TAS series. I'm worried that, being about the last of the analog scopes, that they might have a lot of custom parts. Besides, a 7000 series with 7A24 or 7A26 plugins will do what we need and be repairable too.
toggle quoted message
Show quoted text
--- In TekScopes@..., "Tom Miller" wrote:
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--- On Wed, 1/9/13, sknaugler wrote:
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A 7000 series oscilloscope would also allow the use of a pair of 7A13
differential amplifiers which might be even better than 4 channels of ADD and INVERT in your application if you can get pairs of probes matched for gain. When I was looking for a 4 channel inexpensive DSO, I ended up with two 2230s. On Wed, 09 Jan 2013 05:17:02 -0000, "sknaugler" <steven1955@...> wrote: I'm leaning more toward the 7000 series. I just haven't found out much about the TAS series. I'm worried that, being about the last of the analog scopes, that they might have a lot of custom parts. Besides, a 7000 series with 7A24 or 7A26 plugins will do what we need and be repairable too. |
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--- In TekScopes@..., David DiGiacomo wrote:
I am not sure that the scopes were not well liked by customers, or rather the fact that Tek really did not promote them and watered down their support to the sales force. These were the very last analog scopes that Tek introduced. It was a time when the world was moving to digital scopes, and Tek was way behind by at least two generations in DSO technology. It was also a time where the performance in DSOs was bad, and with short memory and limited sample rate. It was easy to get a DSO in a mode that "lied to you" and users often resorted to pulling out that analog scope when they saw a strange waveform on the DSO. Rather than promote Tek's clearly superior analog scope technology to milk a few more years in sales out of it, the head of the scope division down played analog scopes and focused on hyping what they could with their meager DSOs. As such, there was no sales training for the TAS series, and very limited sales support material generated. In any case, the result was the same as you had suggested ¨C the sales were very low, so there are few of them out there. Parts will be a problem. Service support was to the board level only, so no manual with schematics was offered. I know the power supply design has some reliability problems. I am not sure on this, but I believe the CRTs are similar to the 2465 ¨C probably just specification differences. The 2465 was super high volume, and Tek built a dedicated line in CRT production for them. There were several derivative versions of the basic tube, with only specification changes to give different part numbers. Many of the later scope designs used these derivative tubes because the high volume line produced this high performance CRT at relatively low cost. Steve |
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I own a TAS475! It is a nice scope, but couldn't find a nice service manual for it?anywhere. Last analog family from Tektronix. Most of it is hybrid circuits, but the fact that it was made during the 90's should count for something. Mine was made in 1993. Get a TAS465 service manual, most of the insides are the same, only the front end is a little changed, controls and power supply remains. For each TAS4x5 there are two main revisions, based on the power supply: with manual mains voltage selector, or with automatic mains voltage selector. The only thing I can complain for now is the noisy fan. From: David To: TekScopes@... Sent: Wednesday, January 9, 2013 9:09 AM Subject: Re: [TekScopes] Re: No one going to chime in on the TAS485?
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A 7000 series oscilloscope would also allow the use of a pair of 7A13
differential amplifiers which might be even better than 4 channels of ADD and INVERT in your application if you can get pairs of probes matched for gain. When I was looking for a 4 channel inexpensive DSO, I ended up with two 2230s. On Wed, 09 Jan 2013 05:17:02 -0000, "sknaugler" steven1955@...> wrote: >I'm leaning more toward the 7000 series. I just haven't found out much about the TAS series. I'm worried that, being about the last of the analog scopes, that they might have a lot of custom parts. Besides, a 7000 series with 7A24 or 7A26 plugins will do what we need and be repairable too. > >--- In TekScopes@..., "Tom Miller" wrote: >> >> Looking back at the archives I don't see much on the TAS485. Have you done a search of the archives? I only saw 17 messages related to it. would be a starting place to search out a service manual if one exist. >> >> If I was facing your problem, I would look for or build a differential to single ended amplifier pair to get the signals into a two channel scope. Op amps in the 100 MHz range exist for not much money. There are also Tek differential probes available. That or just get a 7704A or such. >> >> Regards, >> Tom > > |
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The TAS4x5 line shares most of it's components with the TDS Tek scopes of the time. If I remember correctly the CRT is the same as the one in the TDS430. Also the power supply and case were used in the TDS line as well. From: Steve To: TekScopes@... Sent: Wednesday, January 9, 2013 3:06 PM Subject: [TekScopes] Re: No one going to chime in on the TAS485?
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--- In TekScopes@..., David DiGiacomo wrote:
> > The TAS475 and TAS485 are generally not well liked. Service data and > parts are hard to find. Unless you luck out and get a great deal on a > known working scope, you are much better off with a 2445 or 2465 > series scope. Much easier to find manuals and parts, and many people > know how to fix them. > I am not sure that the scopes were not well liked by customers, or rather the fact that Tek really did not promote them and watered down their support to the sales force. These were the very last analog scopes that Tek introduced. It was a time when the world was moving to digital scopes, and Tek was way behind by at least two generations in DSO technology. It was also a time where the performance in DSOs was bad, and with short memory and limited sample rate. It was easy to get a DSO in a mode that "lied to you" and users often resorted to pulling out that analog scope when they saw a strange waveform on the DSO. Rather than promote Tek's clearly superior analog scope technology to milk a few more years in sales out of it, the head of the scope division down played analog scopes and focused on hyping what they could with their meager DSOs. As such, there was no sales training for the TAS series, and very limited sales support material generated. In any case, the result was the same as you had suggested ¨C the sales were very low, so there are few of them out there. Parts will be a problem. Service support was to the board level only, so no manual with schematics was offered. I know the power supply design has some reliability problems. I am not sure on this, but I believe the CRTs are similar to the 2465 ¨C probably just specification differences. The 2465 was super high volume, and Tek built a dedicated line in CRT production for them. There were several derivative versions of the basic tube, with only specification changes to give different part numbers. Many of the later scope designs used these derivative tubes because the high volume line produced this high performance CRT at relatively low cost. Steve |
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On Wed, Jan 9, 2013 at 6:06 AM, Steve <ditter2@...> wrote:
--- In TekScopes@..., David DiGiacomo wrote:Sorry, I meant they are not well liked today, by list members andI am not sure that the scopes were not well liked by customers, or rather the fact that Tek really did not promote them and watered down their support to the sales force. other discerning scope users. They probably just suffer in comparison to the dirt cheap 2465s we enjoy now. |
David Hess
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