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Tektronix CSA series
Hello, I tried to seach info about tektronix
CSA series on Google, but found few. They seem to be somewhat similar to 11k series mainframes, I'd like to know more about them, I'm curious to know what are their limits and strong features. Can they be used as general purpose sampling scopes (fast transients for exmaple)? Can be used for TDR applications? What are common plugins that can be found around. Can be repaired, or are a nightmare of unobtanium parts? Thanks, Fabio. |
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Re: What is this item
Albert
The same number P6022 has been used for a voltage probe. Mentioned for instance in the passive voltage probe overview at Bill & Stan's Tektronix Resource Site.
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Albert --- In TekScopes@..., larrys@... wrote:
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Re: Tektronix 2465 capacitors etc.
Chris
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The problem could be in the 87V regulator Or Their could be a short/low Resistance some where in the load I have a 2465B open and I measured a load resistance of 25.3K to ground on Pin 7 of J121 (87V, the blue wire) with the power supply unplugged from the unit John -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Chris Sent: Sunday, February 17, 2013 5:40 PM To: TekScopes@... Subject: [TekScopes] Re: Tektronix 2465 capacitors etc. All voltages measured in the scope with everything hooked up. I just got done checking the voltages pre-regulator. At J233A I get: pin 5 (87v unregulated) 97.6v Pin 3 (42v unregulated) 49.0v And at J234A I get: pin 5 (15v unregulated) 18.94v Pin 4 (5v unregulated) 6.64 Pin 2 (-5v unregulated) -6.92v Pin 1 (-15v unregulated) -18.54v Based on the unregulated values, I believe the issue must lie in the regulator portions, and since I'm getting the 97.6v pre-regulated it would seem to me the voltage doubler is working. I also double checked and verified the 10v reference voltage at the test point on the main board as well as the J121 connector that feeds the main board. (I figured this was important to double check as the regulators all are based off the 10v reference as I read it). Of course this is where I wish to learn more - I understand what the individual components do but I still somewhat struggle to see what the assembly as a whole is doing, which is why I'm trying to get into all this, so maybe my understanding is skewed. :) At any rate, it would seem to me that with the unregulated voltages where they're at, that the issue would have to lie within the follow area: Yes? No? I mean I have the correct voltages on the left side of those three groups, and the wrong voltages on the right side, so it would seem that's where I should look next? Thanks for helping this newb out! Chris --- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote: at the three 10 uF caps and all the diodes in that area. Be sure to only use fast diodes for any replacements. can come from the factory new. Did you measure all these voltages in the scope or on an external load?
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Re: Need help with component value on TDS684A CRT driver board
Hi,
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ehm, before I wrote r296 but I meant r294.... Giampi --- In TekScopes@..., "miketakeguess" <miketakeguess@...> wrote:
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Re: Need help with component value on TDS684A CRT driver board
Hi,
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yes, r296 connected to the cathode of cr196, is 2.7K 1/4W 5% Giampi --- In TekScopes@..., "miketakeguess" <miketakeguess@...> wrote:
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Re: Basic Probe Question
Richard,
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The Tektronix P6009 probe is rated up to 2.1kV peak (1.5kV rms, 4.2kV p-p), but not at full frequency. It is derated to 1000V peak in the 3MHz to 6MHz range, and 200V peak at 30MHz. These ratings are from the Tek website. The case of DC plus superimposed AC is not covered explicitly. There have recently been a number of imported high voltage, high frequency probes on eBay, one I saw was rated 4kV (DC+peak AC) and 100MHz bandwidth ($49.99), but I assume it cannot handle that high an AC voltage at the full 100MHz. --John Gord --- In TekScopes@..., "Richard" <w6ccd@...> wrote:
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Re: Basic Probe Question
¿ªÔÆÌåÓýWhatever probe you are using, you need to get the manual for it.?
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The voltage limit decreases with frequency. Usually pretty quickly. For
example, at DC your probe might be rated for 500 volts. At 30 MHz, it will drop
down to perhaps 50 volts peak.
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Regards,
Tom
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Re: Basic Probe Question
Richard,
? Suggest you review a couple of web articles before digging into the rig with scope.? Typically if your trying to observe RF at the plate tank, there should be a RF sampler which brings the level down to scope range.
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? Here are a couple of sites I found using a? search engine looking for "scope fundamentals" and "probe basics"
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? Recommend that you research available probes and see what their specification limits are?before using one to probe a tank circuit.? And, I would strongly recommend staying on the cold side ((non HV) of the tank network.? Or, if needed, build a X10?attenuator into the rig to bring the levels down to managable voltages.
?Denis
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From: Richard
To: TekScopes@... Sent: Sunday, February 17, 2013 8:53 PM Subject: [TekScopes] Basic Probe Question ?
I have a 475 scope, but pretty much a beginner in its use. I want to measure RF frequencies in a ham tranceiver that could be as high as 800 VDC, and up to 30 Mhz. My question has to do with the proper type of probe. Is anything special needed to measure RF frequencies that could be generating significant power other than a common probe? Does the scope need protection from high power RF? I want to at least see what is going into the grids of the final amplifier tubes. |
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Basic Probe Question
Richard
I have a 475 scope, but pretty much a beginner in its use. I want to measure RF frequencies in a ham tranceiver that could be as high as 800 VDC, and up to 30 Mhz. My question has to do with the proper type of probe. Is anything special needed to measure RF frequencies that could be generating significant power other than a common probe? Does the scope need protection from high power RF? I want to at least see what is going into the grids of the final amplifier tubes.
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Need help with component value on TDS684A CRT driver board
Hi all,
I have a TDS684A scope that has a problem on the CRT driver board. I've noticed that R294 is discolored. Can anyone tell me what the value of this component is? It measures 2.7K ohm, and it might be correct because I can see the color band is red-purple-????. The 3rd color band is too discolored to tell what it is. If it's red then the value is correct, but I can't tell due to the burn discoloration. Can anybody tell me what value R294 should be? Does anyone have schematics for these CRT driver boards? The TDS520B component service manual only has the B&W display schematic :( Thanks, Mike |
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Re: What is this item
"Rob" <rgwood@...> wrote:
I do not think the person selling this in knowingly doing something wrong.Hmmm...the label on the comp box says P6022, but it's not like any P6022 or P6022 termination I've ever seen. I wonder if the 010-067 number would turn anything up. -ls- |
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What is this item
Rob
¿ªÔÆÌåÓý? Above link or USA EBay item 18108051375 ? I do not think the person selling this in knowingly doing something wrong. However, (correct me if I am wrong it is why I posted) the ends do not appear to me to belong together. Other than the obvious I discarded prior¡.Any ideas as to why someone would do this? ? Thanks as always for the bandwidth. Rob |
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Re: Sphere Research storage building clearout update
Dave C
Chin,
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You need to email Walter directly, not via this list. (I learned the hard way...) :: walter2@... Dave -=-=-=- On 17 February 2013, at 5:15 PM, Chin Siang Lim wrote:
Hi Walter, |
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Re: Tektronix 2465 capacitors etc.
I took the power supply out to look at it again so didn't check the voltage across it, but it is testing as 10.5ohm, so should be good. The other resistors look to be testing at the correct ohms as well.
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Chris --- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote:
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Re: Tektronix 2465 capacitors etc.
¿ªÔÆÌåÓýThose unregulated supplies all look good. I would concentrate on the +87
first since all the others are dependant on it. You might check the drop across
R1221, the current limit shunt. At least check the resistance.
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Tom
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Re: Tektronix 2465 capacitors etc.
Good news then. I was reading about the order they want them repaired in as well, so I was wondering if that may be the case. It would seem odd to have all three voltages drop off like that all at once otherwise. I didn't notice the change in the labels - good find. When I re-capped it I just did one at a time and verified the value I removed and the value I replaced it with. Especially since the service manual is for a 2465B it looks like, and I'm doing an older 300Mhz unit.
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On my board, what made me decide to recap was that one of the 68nF X2 caps blew open (the lower one, forget the location number) and the 30ohm resistor in series with it blew it's side off. I never heard any pops while I was using this unit, so I suspect it blew while the previous owner had it. I used it about 3 hours and then it went out. Seeing the blown cap I decided to recap the whole supply. I haven't been able to test the capacitance of many of the capacitors due to my meter not having enough range, but they seemed to pass ESR. There were 2 or 3 that looked like they may have oozed a tiny bit out the bottom, but haven't made any mess on the boards, just some crusty stuff on the bottoms of the caps. Good luck with your supply. I know I'll be happy when I get my scope back up and running! Chris --- In TekScopes@..., "John Snyder" <Kochcal@...> wrote:
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Re: Tektronix 2465 capacitors etc.
All voltages measured in the scope with everything hooked up. I just got done checking the voltages pre-regulator.
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At J233A I get: pin 5 (87v unregulated) 97.6v Pin 3 (42v unregulated) 49.0v And at J234A I get: pin 5 (15v unregulated) 18.94v Pin 4 (5v unregulated) 6.64 Pin 2 (-5v unregulated) -6.92v Pin 1 (-15v unregulated) -18.54v Based on the unregulated values, I believe the issue must lie in the regulator portions, and since I'm getting the 97.6v pre-regulated it would seem to me the voltage doubler is working. I also double checked and verified the 10v reference voltage at the test point on the main board as well as the J121 connector that feeds the main board. (I figured this was important to double check as the regulators all are based off the 10v reference as I read it). Of course this is where I wish to learn more - I understand what the individual components do but I still somewhat struggle to see what the assembly as a whole is doing, which is why I'm trying to get into all this, so maybe my understanding is skewed. :) At any rate, it would seem to me that with the unregulated voltages where they're at, that the issue would have to lie within the follow area: Yes? No? I mean I have the correct voltages on the left side of those three groups, and the wrong voltages on the right side, so it would seem that's where I should look next? Thanks for helping this newb out! Chris --- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote:
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