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Re: Tek 284 Pulse Gen
I don¡¯t want to spam the list, But I will put it out there since it has been a while. I have video content up on you tube specializing in restoration repair and alignment of test equipment in general however it is mostly Tektronix replated content. I am the owner of the "Zenwizard Studios" YouTube channel. I have also added links to the videos on the Tekwiki under the specific pages as well. In channel related news I am always looking for project units to put in front of the lens so If any one has anything they are willing to parts ways with let me know I am always interested. I have a moderately specified calibration lab at my disposal, though it is a bit noisy.
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In terms of the 284 I am working on getting some high frequency couplers and cables in to the lab because I need to do an alignment video on the 284. But here is the info: The only REALLY critical part in the unit is D180. If that is bad you will need a parts doner. I have tried some of the Russian TD¡¯s in place and it is true they will pulse I have not yet achieved the rise time of the speced part. I have found a company that will made replacements D180¡¯s however they were special order LONG wait time and $250.00 US Each. The air line is a VERY strange beast and there are some faults in there that I get in to in the videos ¡°drifty resisters¡±. But the physical working space is quite tight. Especially with the funky back termination resister assembly. I do not have ANY of the required gear to align the unit in the lab however I have easer to use and more modern equivalents. DSA602A and an 11801C with a 12Ghz plugin and a good frequency counter. I need to 3.5mm to SMA converters as well as a GR->SMA to get the video going. So the alignment should be a LOT easer than the documentation. It calls for 500 series era instruments. Channel Link - 284 specific content including D180 testing If I can be of assistance, please let me know Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of JRN Sent: Sunday, April 24, 2022 1:34 PM To: [email protected] Subject: Re: [TekScopes] Tek 284 Pulse Gen Zen, can you please post the info here, so that everyone can benefit? Thank you very much. |
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Re: Tek 2232 Scope
I've seen somebody on the eevblog forums had the same failure, he ended up
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soldering the wires directly to the board underneath. On Mon, Apr 25, 2022 at 1:08 AM Harrison <buma7@...> wrote:
Picked up a Tektronix 2232 scope at a Club auction recently. It has a dot |
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Re: Tek 284 Pulse Gen
Dave I will shoot you some information off list.
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Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of DaveH52 Sent: Sunday, April 24, 2022 1:11 PM To: [email protected] Subject: [TekScopes] Tek 284 Pulse Gen I've recently acquired a 284 that seems to need some TLC. Before I start snooping around in it, I'm wondering if there are any "usual suspects" that I should consider. Besides all the electrolytic capacitors. They're already on my hit list. Thanks - Dave |
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Re: 2465 Calibration
Mark,
The spec on the GI ER1400 data sheet does indicate that the data is retained for a minimum of 10 years but does not indicate if that is when the device is never accessed/written to over that time period. By chance does the 2465 scope processor refresh the contents of the EAROM through a periodic R/E/W cycle (i.e. each time when powered up, contents altered, etc.)? Greg |
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Tek 2232 Scope
Picked up a Tektronix 2232 scope at a Club auction recently. It has a dot with the "beam finder"but no trace. You can move the dot vertically and horizontally with the position knobs. Opening it up I found the J9011 connector that mates with W9011 on the Storage Board broken and the eight individual black insulated wires (perhaps 16 or 18 gauge wires) coming from P9010 and J9010 on the storage board power distribution board.flapping in the air. It appears as if the J9011 plug upper half of the connector has broken. Questions:
Might someone have the P9010/J9010 to W9011/J9011 cable in a junk box. Second: I am struggling to find a suitable replacement. 9011 socket and jack. Looking at Mouser, digiikey, TE Connections, etc.I am having a hard time identifying a replacement. There is not much head room so the wires need to come into the side of the jack. Pin 1 to Pin 8 CL to CL measures out to be 1.139". The only markings on the J9011 is 3M 2-0-8. Any advice or guidance is appreciated. |
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Re: Upload a picture
Hi John,
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Michael Lynch just taught me how to post a photo. Visit the below included link. The instructions are easy to follow. Regards, Ken ;data=05%7C01%7C%7Ca0d39b10e30a4686b1f608da20d950f8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637858414979216155%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=bG%2FTKOVD5kDoEOfOeNopWgeoJ8bmY6TaCXT3%2FHnE68M%3D&reserved=0 <;data=05|01||a0d39b10e30a4686b1f608da20d950f8|84df9e7fe9f640afb435aaaaaaaaaaaa|1|0|637858414979216155|Unknown|TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=|3000|||&sdata=bG/TKOVD5kDoEOfOeNopWgeoJ8bmY6TaCXT3/HnE68M=&reserved=0> On 24Apr, 2022, at 9:11 AM, JohnEdward via groups.io <JohnEdwardShea@...> wrote: |
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Re: Tektronix P6021Current Probe Termination
On Sat, Apr 23, 2022 at 06:21 PM, Glydeck wrote:
Looks like Ken uploaded it to TekScopes;Looks like it's missing a second page. BTW, I have a spare Model134 Amplifier, if anyone wants to buy one. |
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Re: Peak Detector to Validate Tek Const. Ampl. Signal Gen. (067-0532-00)
On Sat, Apr 23, 2022 at 11:10 PM, Jeff Dutky wrote:
The cells in my unit, at 1.25 V, clearly need to be replaced, regardless of!.25 V sounds just about right for a mercury cell, but low for an alkaline. |
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Re: 2465 Time-Marker Calibration Procedure
On Sun, Apr 24, 2022 at 12:43 AM, si_emi_01 wrote:
By Delay Position, do you mean the deltaREF knob? Thanks so much, guys, for all your help. This is my first Tektronix, or any electronic restoration for that matter, so thank you for being patient with me. I am a retired electrical engineer, but I did logic design for many types of integrated circuits, large and small, from processors to hard disk drive preamps and motor controllers. As a result of not using it, I have forgotten much of the analog stuff. |
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Re: 2465 Time-Marker Calibration Procedure
A couple of <corrections>.
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Sorry about that. Ross -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of si_emi_01 Sent: Saturday, April 23, 2022 11:43 PM To: [email protected] Subject: Re: [TekScopes] 2465 Time-Marker Calibration Procedure I spent a lot of time calibrating a 2465A for a nephew today. I have all of the Tektronix Calibration equipment to perform the calibrations. I have also interleaved some responses to your questions as well. Ross -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Harvey White Sent: Saturday, April 23, 2022 6:26 PM To: [email protected] Subject: Re: [TekScopes] 2465 Time-Marker Calibration Procedure Interleaved, at least what I can answer On 4/23/2022 7:50 PM, jimbert4 via groups.io wrote: 1) The procedure calls for a Time-Mark Generator. Is this really just a pulse generator? What is the pulse width?Tektronix time mark generators can put out narrow spikes with a sharp leading edge (so you can tell where it is). They generally have intervals from 1 ns down, although the 1,2 and 5 ns pulses are more sinewaves than not. Ross - As Harvey has mentioned, the TG501 (Time Mark Generator), creates a double-exponential spike (Fast Rise, slow Fall - like teeth rising from the baseline or a RADAR PIP waveform). Harvey is correct, the most important characteristic is that the time interval is correct and that they are linear from division one to division Ten. Their amplitude is about 1.5V minimum. The pulse <position> changes based on what Calibration Step you are performing. You will need to provide 2ns, 20ns, 50ns, 100ns, 500ns 1us, 2us, 10us, 50us, 1ms Pulses. The 1/2 width-1/2 height duty cycle is about 30%. Using a Pulse Generator might get confusing. My <TG-501> produces good waveform fidelity out to 5ns, then it becomes a sine wave as Harvey also mentions. Ross - If you are wondering, when they call out 10 divisions, they are also counting the left most division edge of the first centimeter. So, when you count over to the center graticule, it is actually 6 divisions. When you count the Step where it calls out 6 markers, it ends up being the center vertical graticule. On that same step, it asks you to adjust the waveform separation knob, drop the B-Delayed Sweep waveform down below the Main A-Sweep and you will see two waveforms nearly converging. Center up the first one over the center vertical graticule with the Delay Position first, then merge the other waveform on top of it with the Delta Knob, within 0.2cm. As you can see from the Cal 01 procedure, they want you to do that for all of the similar sections. It is usually easiest to use the Delay Position first then the Delta Delay. If you are using a Pulse Generator, you may have a hard time with this. You may run into the same issue with the Bench Scope procedure too. You are also going to need an accurately times Sine Wave for the Transient Response test. Wouldn't matter if it did, all you're looking at is the interval between leading edges. Ross - Yes, it is a positive going double-exponential pulse except when it is a sine wave as discussed above. Enough to give you a good presentation. The idea is time and risetime, not amplitude so much. Ross - Harvey is correct. The answer is above. This has been covered in similar questions, you might try 2465 calibration. Since I don't have one, I've not studied the procedure. Ross - This is answered above. You will do this even when you do the stuff in Table 5-4. I suspect so, but it needs to be 50% symmetric as a good guess. Ross - You will actually need to generate a 2ns waveform for the Transient Response Test. When you move on to CAL 02, make sure that your PG506 is set up to generate a 100kHz Square Wave of the correct Amplitude. You can't just use a DC Supply to generate accurate Voltage Levels during the Automated Calibration Procedure. It has to have an active waveform or it will error (LIMIT), and you can't get past it in a well-behaved way. In addition to that, you will need the Fast-Rise Waveforms. Those are 100kHz are <1V and are about 875ps. Ross - Lastly, don't get frustrated by it requiring you to go back a step. It saw that the setting was out-of-range. Just trim the Delayed Sweep waveform a little with the Delay Position knob. And, don't operate any know that it doesn't call out for you to move, it may invalidate your Calibration and you get to try it again. It takes a good two hours to complete CAL 01 through CAL 07. It goes a lot smoother with the right equipment, though. Harvey Ross |
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Re: 2465 Time-Marker Calibration Procedure
I spent a lot of time calibrating a 2465A for a nephew today. I have all of the Tektronix Calibration equipment to perform the calibrations.
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I have also interleaved some responses to your questions as well. Ross -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Harvey White Sent: Saturday, April 23, 2022 6:26 PM To: [email protected] Subject: Re: [TekScopes] 2465 Time-Marker Calibration Procedure Interleaved, at least what I can answer On 4/23/2022 7:50 PM, jimbert4 via groups.io wrote: 1) The procedure calls for a Time-Mark Generator. Is this really just a pulse generator? What is the pulse width?Tektronix time mark generators can put out narrow spikes with a sharp leading edge (so you can tell where it is). They generally have intervals from 1 ns down, although the 1,2 and 5 ns pulses are more sinewaves than not. Ross - As Harvey has mentioned, the TG501 (Time Mark Generator), creates a double-exponential spike (Fast Rise, slow Fall - like teeth rising from the baseline or a RADAR PIP waveform). Harvey is correct, the most important characteristic is that the time interval is correct and that they are linear from division one to division Ten. Their amplitude is about 1.5V minimum. The pulse width changes based on what Calibration Step you are performing. You will need to provide 2ns, 20ns, 50ns, 100ns, 500ns 1us, 2us, 10us, 50us, 1ms Pulses. The 1/2 width-1/2 height duty cycle is about 30%. Using a Pulse Generator might get confusing. My PG506 produces good waveform fidelity out to 5ns, then it becomes a sine wave as Harvey also mentions. Ross - If you are wondering, when they call out 10 divisions, they are also counting the left most division edge of the first centimeter. So, when you count over to the center graticule, it is actually 6 divisions. When you count the Step where it calls out 6 markers, it ends up being the center vertical graticule. On that same step, it asks you to adjust the waveform separation knob, drop the B-Delayed Sweep waveform down below the Main A-Sweep and you will see two waveforms nearly converging. Center up the first one over the center vertical graticule with the Delay Position first, then merge the other waveform on top of it with the Delta Knob, within 0.2cm. As you can see from the Cal 01 procedure, they want you to do that for all of the similar sections. It is usually easiest to use the Delay Position first then the Delta Delay. If you are using a Pulse Generator, you may have a hard time with this. You may run into the same issue with the Bench Scope procedure too. You are also going to need an accurately times Sine Wave for the Transient Response test. Wouldn't matter if it did, all you're looking at is the interval between leading edges. Ross - Yes, it is a positive going double-exponential pulse except when it is a sine wave as discussed above. Enough to give you a good presentation. The idea is time and risetime, not amplitude so much. Ross - Harvey is correct. The answer is above. This has been covered in similar questions, you might try 2465 calibration. Since I don't have one, I've not studied the procedure. Ross - This is answered above. You will do this even when you do the stuff in Table 5-4. I suspect so, but it needs to be 50% symmetric as a good guess. Ross - You will actually need to generate a 2ns waveform for the Transient Response Test. When you move on to CAL 02, make sure that your PG506 is set up to generate a 100kHz Square Wave of the correct Amplitude. You can't just use a DC Supply to generate accurate Voltage Levels during the Automated Calibration Procedure. It has to have an active waveform or it will error (LIMIT), and you can't get past it in a well-behaved way. In addition to that, you will need the Fast-Rise Waveforms. Those are 100kHz are <1V and are about 875ps. Ross - Lastly, don't get frustrated by it requiring you to go back a step. It saw that the setting was out-of-range. Just trim the Delayed Sweep waveform a little with the Delay Position knob. And, don't operate any know that it doesn't call out for you to move, it may invalidate your Calibration and you get to try it again. It takes a good two hours to complete CAL 01 through CAL 07. It goes a lot smoother with the right equipment, though. Harvey Ross |
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Re: Peak Detector to Validate Tek Const. Ampl. Signal Gen. (067-0532-00)
Jared,
I compared the two versions of the manual for the 067-0625-00 (the early one using mercury cells, and the later one using alkaline manganese oxide cells) and there is no difference in the resistor values specified in either the schematic or the parts list; only the battery voltages differ The cells in my unit, at 1.25 V, clearly need to be replaced, regardless of whether they are mercury or alkaline chemistry, so I'm going to follow the replacement and adjustment procedures in the manual. I will only replace R10 and R11 if the adjustment process fails. -- Jeff Dutky |
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Re: 453 trace finder location
Pat,
The trace location is under the graticule intensity knob on the left. Likely the contacts are dirty. C1194 and/or C1181 is the one you are talking about with the corroded lead. The first one I put in a film type. The output decoupling, I used a 56mfd 100V Nichicon UHE type since I had these in stock. C937 could be bad giving you the higher ripple than you want on the negative supply for the crt. If you replace it, use a high temperature, low ESR type that is 35V, e.g. Nichicon ULD or UHE type. The capacitance is not critical so if you put in a larger value, it is fine. Do not lower the capacitance. A 47mfd to replace a 50mfd is close enough, not something like 33mfd or less. You could increase the value of C966 to lower the ripple. The slow warming could be the 8393 Nuvistors are weak, if yours is old enough to use them. Mark |
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453 trace finder location
Where is the trace finder typically located on a 453? Anywhere, centered who knows?
Dug out the 453 last week and started looking into maybe or hopefully getting it going again. It looks like the X axis is out of whack as I can see the CRT glow as I move the vertical position move up and down and all those years of owning it I have never used the Trace Finder function. The Trace Finder in Auto Trigger shows a tiny trace a little over 1/2 of a division and 2 divisions left of center with the Horizontal Position knob centered. Checked the voltages and all looked in order however I can¡¯t see any ripple but loads of noise in the order of 40 volts on the HV(-1950) and 20mv on the +75 volt supply and 15 to 20mv on the + and -12 volt supplies. Those were taken with the digital oscilloscope but did use the Fluke to confirm the voltages. That¡¯s about as far as I have gotten so far aside from poking around for several hours looking for something loose. I do have a leaky small cap on the power supply board as there is corrosion on the lead of it in the +75volt side(10uf or less). That was the only thing that looked out of place as I was quite impressed with how nice it looks inside. Only problem I had in the past was the fan bearings as one of them was making a lot of noise and had to replace them back in the late 80¡¯s. I replaced my old 453 several years ago as I was loosing the trace on the 453. It started slowly as it took longer and longer to warm up but in the meantime I had been researching budget digitals and purchased one. Went to do some audio work about a year after purchase of the digital and it totally stunk for doing audio work. Got out the 453 and it took forever to get the old 453 going but did get the job done and chased down the problems for the stage lighting while I had it working. I found a nice Japanese 40Mhz scope at a hamfest for $20 and been using it for audio work and does a fine job. I purchased the 453 in 1980 after I graduated High school and has been like a family member. I am new to the group and have been enjoying the research as I recently acquired a 7854. Take care Pat |
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Re: 2465 Time-Marker Calibration Procedure
Interleaved, at least what I can answer
On 4/23/2022 7:50 PM, jimbert4 via groups.io wrote: 1) The procedure calls for a Time-Mark Generator. Is this really just a pulse generator? What is the pulse width?Tektronix time mark generators can put out narrow spikes with a sharp leading edge (so you can tell where it is).? They generally have intervals from 1 ns down, although the 1,2 and 5 ns pulses are more sinewaves than not. Wouldn't matter if it did, all you're looking at is the interval between leading edges. Enough to give you a good presentation.? The idea is time and risetime, not amplitude so much. This has been covered in similar questions, you might try 2465 calibration.? Since I don't have one, I've not studied the procedure. I suspect so, but it needs to be 50% symmetric as a good guess. Harvey |
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2465 Time-Marker Calibration Procedure
1) The procedure calls for a Time-Mark Generator. Is this really just a pulse generator? What is the pulse width?
2) Is the Time-Mark a positive pulse, i.e. it does not go below gnd in its low state? 3) What should the amplitude of the Time-Mark be set to? 4) The procedure says to adjust the deltaREF control to intensify the 2nd (for example) time marker and adjust the delta control to intensify the 10th time marker. Okay, I understand that. Then it says to superimpose the delayed B Sweep time markers within 0.2 division. Not sure about this. I see the 2 magnified (B?) sweeps, so am I supposed to adjust them to align the edges on top of each other? Is that like a fine control on adjusting the times? Does it matter which delta control(s) I use to make this fine adjustment? 5) The final Time-Mark setting is for 20ns (50MHz). My waveform generator only goes to 30MHz. Could I use a 40ns (25MHz) square wave and count edges instead of time marks? |
DaveH52
JohnEdward
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