Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- TekScopes
- Messages
Search
|
Re: 7904 R7903 general impressions
John Griessen
bhaskins@... wrote:
I'm looking for a new toy and am thinking about a 7904 or R7903.If you have more than one lab bench in use, some rack mount scopes can be helpful, even stacked up three high... At one of my two benches, I have a 2230 DSO on the left on an adjustable shelf, plus a rack mount R7903 on the shelf above that, and a 7844RM right on top of it. Below the shelf at the left is a lower than lab bench height desktop with computers on it, and connections from them to the bench flow easily under the scopes. I can't see all the scopes from a sitting position, but I have my lab benches chest high for standing work, and a normal height desktop adjacent. The 7844 is a four slot rackmount shape...about as fast as a 7904 too... John Griessen PS My other bench has a 7904A. |
|
Re: TDS540 - replaced caps but beeper stuck on and clock issue?
Hi Stephen,
toggle quoted message
Show quoted text
? Thanks for the info. ? I'm not sure what Tekronix was thinking with a clock that needs to be reset every time you power up - seems pretty useless to me. ? I'll try cleaning and recapping the front panel next. David. --- On Sun, 10/5/08, Stephen Smith <sjsmith@...> wrote:
From: Stephen Smith <sjsmith@...> Subject: [TekScopes] Re: TDS540 - replaced caps but beeper stuck on and clock issue? To: TekScopes@... Date: Sunday, October 5, 2008, 10:34 PM Hello David, I'm fairly sure that all the original TDS520/540/620/ 640/820 series do not have battery backed real-time clocks. The time is kept in non-volatile memory but not updated while powered down. You need to set the time each time you power up. (I know, I have to do this on my TDS820). The TDS500/600/700 A,B,C and D series had battery backed RTCs. Another issue is that the internal batteries in the non-volatile components are eventually going to fail. They are supposed to have a life of around 10+ years, however I think a lot of these are now well over this. Do you know what the date code is on the DS1245Y-120? As for the piezo beeper, I'm not sure, however it is on the front panel PCB which you haven't done yet... Regards, Stephen. --- In TekScopes@yahoogrou ps.com, David Woodhead <david_woodhead@ ...> wrote: Acquisitions boards in my TDS540 (did not do front panel yet). I also replaced a couple of TL074's that had a bunch of electrolyte underneath them. the I/O cal routine and it calibrated without issue as well. In fact I have checked everything I can think of and it all appears to be working very well except..... correctly. I can set and it runs fine but when I power down and power up again (a few minutes later) it appears that the clock did not continue to run when powered down. It does not default to year ~2002 (build date) - it remembers the time when powered down and picks up where it left off when powered up again! When I press diplay time it tells me that the clock is not updating when powered downand to run the setup utility to set the time. values ok (when powered down). But the clock does not continue to run when powered down and the beeper is stuck on.
[Non-text portions of this message have been removed] |
|
2430A CCD and PA fail... bad NVRAM?
synthmdl76
Hello all... here is the issue.
I bought it on ebay and recieved it and it worked fine. I looked in the help log and it stated 430hrs run time.... yes low, but I dont think it was true. after 2 days I powered it up and got a fail on the ccd during the self test. It was a 7430 /ccd/pd-offset/ch2-1 to be exact. Ran the ext diag and then got a CCD Fail and a PA fail. I let the unit run for a 0.5 hours or so and did a run test (ext diag) till passes during this time and the unit finally passed. turned the unit off (let it cool overnight) and powered it back up today and I got a CKSUM-NVRAM fail with many of the self test(1000-8000) blank (untested). I wound guess theyre blank because the scope did not run these test because it relies on values stored in ram (from what Ive read in this group). I let the scope warm back up for a few minutes, re-ran the ext diag and all passed (including the nvram) but the 7430 CCD/PD-OFFSET/CH2-1 which failed. The 8132 /PA/OFFSET/ENV-SP-SLOW CH2 was failing a bit for the first few minutes but now passes. I have also noticed during the self test the crt display flicker slightly. I wonder if this is normal or if the caps in the power supply may be bad as I guess is common on a unit this age. Now the thing is... even with these errors I can still use the scope, both channels and it seems to work fine. All I use it for is my DIY synthesizer build to see if Im getting signals where I should (nothing precise). My question is I wonder if I have a bad DS1230AB NVRAM (bad battery to be exact) and not a bad CCD and PA that are causing these errors? |
|
FS: 310A and 317 scopes
Several years ago I was bitten by the Tekscope bug and eventually
accumulated fourteen different scopes. I finally realized that many of them just sit around looking nice and gathering dust, so would like to sell some. The big 5's just cost too much to ship nowadays so I'm probably stuck with them (I also have a nice 515A I'm not using if anyone's interested). Anyhow the 310A and the 317 are both working (see pics). (I cleaned the storage dust and dirt off them after taking the calibrator trace pics. They aren't rusty). I'll throw in the P6027 (1X probe) that came with the 310A. The 317 is missing the right cabinet panel and I don't have a spare power cord for it. Otherwise complete. Please make reasonable offers ("silent auction") before I put them on that auction place. Shipping on your dime from zip 65775 (US). thanks Charles |
|
Re: 535A stood on its end
snapdiode
--- In TekScopes@..., Andre Majorel <aym-scinortcele@...>
wrote: The only thing I can think of, and it is a stretch, is that now the Mumetal cone has its open ends the wrong way around. Maybe the CRT isn't shielded the same way it was before. But it's a given that you have to adjust the trace rotation when you move the scope. |
|
2n2207 for 547 horizontal sweep and 3A1, 3A6 multivibrator
FYI
toggle quoted message
Show quoted text
Had an issue with a recently acquired 3A6 - trace switching multivibrator was inop. Contact cleaning and reseating the transistors did the trick. The interesting part was that both transistors had been replaced with what appear to be Motorola devices. They are labeled exactly as follows: M151 0188 Haven't tried to source or cross them. Since they work in the 3A6 they might do fine in the 547, also. Would like to be copied on any follow-ups. Bernd Schroder In a message dated 8/28/2008 8:53:03 PM Pacific Daylight Time,
larynx222@... writes: I'm new to this group, and I can't speak as an expert, but I had a 2N2207 go bad in the multivibrator section of a 3A1 plugin from a 565 scope. I also had trouble finding this transistor, so I tried a 2N404a and it has worked just fine for the past 6 months. I don't know if the operating parameters are more demanding in the sweep section of a 547, but it might be worth a try. 2N404a's were a lot easier to find If an easy source for 2N2207's exists I'd like to hear about it also. Hope this helps ----- Original Message ---- From: samuelrankin <_sam.rankin@... (mailto:sam.rankin@...) > To: _TekScopes@yahoogrouTekSco_ (mailto:TekScopes@...) Sent: Thursday, August 28, 2008 5:37:53 PM Subject: [TekScopes] 2n2207 for 547 horizontal sweep. The horizontal sweep on one of my 547 oscilloscopes died yesterday. I've been able to diagnose the root cause as being a faulty 2N2207 PNP transistor. My question to the group is: where can I find some replacement transistors. A quick search yielded American Microsemiconductor. But the minimum $50 order is way overkill. Thanks in advance for your help. Regards, Sam ****New MapQuest Local shows what's happening at your destination. Dining, Movies, Events, News & more. Try it out! () |
|
Re: 535A stood on its end
Craig Sawyers
Hello all. Are there any known problems with using a 535A inOther than cooling (ie ensuring that the fan intake is not obscured), and ensuring that the fan does not do a good job of vacuum cleaning the floor and depositing it in the scope, I can think of no reason why not. Craig |
|
Re: TDS540 - replaced caps but beeper stuck on and clock issue?
Hello David,
I'm fairly sure that all the original TDS520/540/620/640/820 series do not have battery backed real-time clocks. The time is kept in non-volatile memory but not updated while powered down. You need to set the time each time you power up. (I know, I have to do this on my TDS820). The TDS500/600/700 A,B,C and D series had battery backed RTCs. Another issue is that the internal batteries in the non-volatile components are eventually going to fail. They are supposed to have a life of around 10+ years, however I think a lot of these are now well over this. Do you know what the date code is on the DS1245Y-120? As for the piezo beeper, I'm not sure, however it is on the front panel PCB which you haven't done yet... Regards, Stephen. --- In TekScopes@..., David Woodhead <david_woodhead@...> wrote: Acquisitions boards in my TDS540 (did not do front panel yet). I also replaced a couple of TL074's that had a bunch of electrolyte underneath them. the I/O cal routine and it calibrated without issue as well. In fact I have checked everything I can think of and it all appears to be working very well except..... correctly. I can set and it runs fine but when I power down and power up again (a few minutes later) it appears that the clock did not continue to run when powered down. It does not default to year ~2002 (build date) - it remembers the time when powered down and picks up where it left off when powered up again! When I press diplay time it tells me that the clock is not updating when powered downand to run the setup utility to set the time. values ok (when powered down). But the clock does not continue to run when powered down and the beeper is stuck on.
|
|
Re: 7904 R7903 general impressions
Bernice Loui
Hello,
Of the two choices, the 7904 would be better for most work. If rack mount is required, then it going to be a R7xxx, with three slots. The 7xxx mainframe choice depends more on what one is planning to work on with the scope. The later 7904A has a number of improvements that are worth considering (improved power supply, nicer packaging, various circuit updates and etc.). I have used 7904's for years and still to this day,they are one of my favorites. They the basic "work horse" 7K mainframe. Two other very interesting 7K main frames would be the 7844 dual beam which is basically two 7904s in one package or the 7104, micro channel plate CRT with 1Ghz bandwidth using the proper plug ins. I currently use a 7104 at work for specialty analog/digital design work and what that MCP offers is very high real time writing speed. Bernice ~~~~~~~~~~~~~~~~~~~~ I'm looking for a new toy and am thinking about a 7904 or R7903. There is a lot of material in the archives but I would still like to get some ideas from the group as if this is a good choice or if there are better choices in the 7XXX family. Thanks for your input, Bert |
|
Re: Tek 7S12 TDR plugin for trade
Hello again,
toggle quoted message
Show quoted text
I think I goofed yesterday and replied to the moderator instead of the list. I just wanted to clarify the trade offer. The 7S12 is just the 7S12, no plugins. Also, the knob for turning the distance tape scale is not 100%. It has a flip out handle for turning the knob, but the actual handle is gone. It functions like an ordinary knob though. Also, I have a line on a 7D15 for a decent price. I'm still looking for sampling heads and pulse generator heads. Thanks, Bob --- In TekScopes@..., "redarlington" <rdarlington@...> wrote:
|
|
TDS540 - replaced caps but beeper stuck on and clock issue?
Hi all,
I just finished replacing all the electroytic caps on CPU and Acquisitions boards in my TDS540 (did not do front panel yet). I also replaced a couple of TL074's that had a bunch of electrolyte underneath them. It now powers up and reliably passes the power on self test. I ran the I/O cal routine and it calibrated without issue as well. In fact I have checked everything I can think of and it all appears to be working very well except..... The beeper stays on continually. Also, the clock is not working correctly. I can set and it runs fine but when I power down and power up again (a few minutes later) it appears that the clock did not continue to run when powered down. It does not default to year ~2002 (build date) - it remembers the time when powered down and picks up where it left off when powered up again! When I press diplay time it tells me that the clock is not updating when powered downand to run the setup utility to set the time. The scope is remembering time and appears to be storing calibration values ok (when powered down). But the clock does not continue to run when powered down and the beeper is stuck on. Any ideas? Thanks! David. |
|
Re: 2465A issue
This is normal. The calibrator changes frequency with the Time/Div
toggle quoted message
Show quoted text
setting. Mitch N4MF --- In TekScopes@..., "thepinkfloyd67" <timrim@...> wrote:
|
|
Tek 465M Manual , New Posting
Ashley
Hi,
A manual for the Tek 465M has been posted on: , courtesy of Mr Stan Griffith (W7NI) and the manual site owner. This manual includes schematics and is divided into chapters (sections in the original TEK manual). Thank You Kiss-Electronics Ms Ashley Hall Cornelius, Oregon W7DUZ |
|
2465A issue
I have a 2465A, when I connect a prob to the built in calibrator, the
timebase and volts/div only have slight effect on waveform by switching through the various settings, as I increase the timebase frequency, it just starts to distort the waveform instead of stretching out the wave. The scope responds ok to a signal generator just fine, timebase and volts/div operate as expected. |
|
Re: TEK 310-316-317-360 CRT Bezel needed
Kurt
For the benefit of the list archive: I checked the bezels
toggle quoted message
Show quoted text
on my 310A and 360 and found that they are slightly different, but they are mechanically interchangeable. The 360 bezel is a bit more solid and has a boxy look compared to the rounded corners on the 310A bezel. -kurt --- In TekScopes@..., "vollumscope" <perls@...> wrote:
|
|
Re: 7904 R7903 general impressions
Craig Sawyers
I'm looking for a new toy and am thinking about a 7904 or R7903.My 7904 is my general scope of choice. In fact it gets used most (currently housing a 7L5 and tracking gen), with a 475/DM44 as an easily luggable alternative when needed. Unless you need rack mounting, steer clear of the R7903 - it only has three bays as opposed to 4. Craig |
redarlington
to navigate to use esc to dismiss