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help needed for tektronix 2467b.
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dear members, I am from india ( just getting started into electronics as a hobbyist ) and my friend (who stays at sf bay region california) has got me a Tektronix 2467b oscilloscope (he had got a good deal in ebay don't know the seller), any member in sfbay region who is willing to help him inspect, check for nvram replacement and any other component replacement in any of the boards.. because once it comes to india it will be difficult to try and fix. kindly help.
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On Sat, 20 Apr 2019 19:28:26 -0700, you wrote:
dear members, I am from india ( just getting started into electronics as a hobbyist ) and my friend (who stays at sf bay region california) has got me a Tektronix 2467b oscilloscope (he had got a good deal in ebay don't know the seller), any member in sfbay region who is willing to help him inspect, check for nvram replacement and any other component replacement in any of the boards.. because once it comes to india it will be difficult to try and fix. kindly help.Not in Califonia, but be aware that the MCP (microchannel CRT) in the 2467B has some things to think about. 1) while the bandwidth and brightness are very good, the MCP mechanism has a limited time that it lasts. Some have used it for a long time without effects, some find that the screen has some burn on it. If it has any readouts (the 7104/7103 do and use the same CRT), then keep the intensity as low as possible on the readouts. Same for the CRT. The 710x series has a timer that reminds you to limit the intensity at high brightness levels. I have both the 7103 and 7104, and unless I need the bandwith, they stay off. However, the 2467B may be different, and you may not need to be so cautious. It's a very good scope for finding glitches. I don't have a 2467B, but I'm generalizing from the CRT to the instrument. It intensifies the trace so that a very infrequent "bad" pulse can be seen with a series of good ones. Please check the catalogs for an excellent example of how this works, (say 1990 to about 2000, available on the net). It should give you a long life when used reasonably. Keep the intensity low and do not leave it on with a fixed pattern for a long time. Read the manuals and they'll tell you a lot. Others may differ in their opinions. Some have used the 2467 series for their daily scope without consequence, but based on the 710x series, there are some things to be careful with. Nice scope, and have fun with it. Harvey |
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On Sat, Apr 20, 2019 at 07:39 PM, Harvey White wrote:
Hi All: I remember something about an limiter circuit to limit the anode current, when driving the CRT hard (displaying a bright trace). That circuit was supposed to keep the maximum brightness to a safe level and to protect the MCP from aging too fast. Don't remember any CRT timer... or warnings about limiting brightness... could be an option in the software? Also, if you run the self tests, you can see how many times it has been powered up, and I think... the total number of powered on hours. (the lower the better, for CRT life.) Best regards and wishes. |
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Chuck Harris
The 2467B and 7104 most assuredly do *not* have the same CRT!
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There is a good 6 inches of difference. They both have a micro channel plate (MCP) image intensifier, but they are not the same CRT. By the time the 2467 came along, many of the difficulties with the 7104 CRT had been mitigated. The 2467 has a more sophisticated timer mechanism that shuts the CRT down after 5 or 10 minutes of inactivity. It also moves the display information around in the upper and lower graticule area to help distribute any burn-in that will occur. So, even if you don't pay any attention to the MCP weaknesses, the 2467 will give you a pretty long life. Unfortunately, tektronix did not change the control program much between the 2465B and the 2467B, and the calibration routine does serious damage to the MCP screen every time it is done. And, they change the intensity, every time the buttons on the right side of the CRT are used, to an excessively bright value. -Chuck Harris Harvey White wrote: 1) while the bandwidth and brightness are very good, the MCP mechanism |
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Chuck Harris
The 2467B will go into a screen saver mode after about 5 minutes
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of inactivity (eg. no knob motion). It also will move the display readout positions every so often to prevent burn-in. The counters for power on and number of operating hours are usually reset every time the scope is calibrated. They are only there to give an idea of how the scope was used since its last calibration. -Chuck Harris Roy Thistle wrote: On Sat, Apr 20, 2019 at 07:39 PM, Harvey White wrote:Hi All: |
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On Sat, 20 Apr 2019 23:07:50 -0700, you wrote:
On Sat, Apr 20, 2019 at 07:39 PM, Harvey White wrote:Since the 2467B is mostly software driven, and the 710x series isHi All: hardware without a bit of software, I can see the mechanisms being quite different. The idea, though, is much the same. Not at all sure that the 67B will have the same problem, but I'd be suspicious and take it easy until I knew definitively if there was a problem. Trying to minimize the time that the CRT is set for an extremely bright horizontal line and left on for hours.... Seen that one. Harvey Best regards and wishes. |
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Seems there are some Fab Labs, Hacker Space's or Maker Space's in the area that may be able to assist. Maybe is a place to visit and see who can assist.
I'm sure there are SME's in the area... though I'd guess with California pricing... everyone is busy working to afford living there. Kindest Regards |
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These scopes are not a good fit for a hack job if you want extended life. I recommend you get it to an experienced tech that understands these units and can make successful repairs without creating further damage. If you would like to ship unit to me I can help with the evaluation/repairs. Electronixtoolbox@...
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Craig Cramb
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