hybridfree/eevblog-posts huggingface dataset:
Tektronix 2215 - Page 1
Forum section: electronics / beginners

author: Cali-Sam
author_rank: Contributor
timestamp: May 15, 2013, 05:04:45 pm
content: I just got my tektronix 2215 60mhz in the mail, powered up but I can't get the second Chanel to trace on the screen. I don't feel like reading the manual. ...I bought it from eBay for 150 USD. Any thoughts on this scope? I mean is it a reasonable scope for someone who had never had a scope?

author: KJDS
author_rank: Super Contributor
timestamp: May 15, 2013, 05:12:58 pm
content: Just to check the obvious, you have switched to either CH2 or both? May be worth switching the input to Gnd too.

author: PhilNY
author_rank: Contributor
timestamp: May 15, 2013, 05:28:20 pm
content: http://njarc.org/books/XYZs%20of%20Using%20a%20Scope/XYZs_of_Using_a_Scope.pdfA nice tutorial

author: w2aew
author_rank: Super Contributor
timestamp: May 16, 2013, 03:13:45 am
content: Quote from: Cali-Sam on May 15, 2013, 05:04:45 pmCertainly the 2215 is a very reasonable analog scope for someone that has never had a scope. As with any tool, you do have to invest a little time reading/learning how to use its features. What settings did you try when trying to display the trace for CH2?

author: lowimpedance
author_rank: Super Contributor
timestamp: May 16, 2013, 04:22:25 am
content: You have just spent 150 bucks, why the aversion to reading the manual ??. Tektronix printed it for a reason.

author: ddavidebor
author_rank: Super Contributor
timestamp: May 16, 2013, 06:07:57 am
content: Real men never read manuals.XD

author: Unknown
author_rank: Unknown
timestamp: May 16, 2013, 08:48:42 am
content: WHAT !!... Ignorance is bliss ?

author: ddavidebor
author_rank: Super Contributor
timestamp: May 16, 2013, 12:35:06 pm
content: XD

author: Cali-Sam
author_rank: Contributor
timestamp: May 16, 2013, 11:14:13 pm
content: I just got it working. There is abviously a lot to learn about this scope.
Tektronix 2225 flickering display - Page 1
Forum section: electronics / beginners

author: tech243
author_rank: Newbie
timestamp: December 02, 2016, 02:30:53 am
content: I have a Tektronix 2225 with a display that is flickering in brightness, not geometry. Associated with this is a faint hissing, crackling coming from the high voltage area of the power supply section. After much head scratching I removed the high voltage transformer, T902. The winding that supplies HV to the multiplier reads open circuit. I guess that the HV is enough to jump the broken wire inside the transformer and hence the hissing sound. Does anyone have any info on this transformer? in particular the resistance measurement of the winding measured from the brown wire on the multiplier and pin 14 on the transformer. also where to get a replacement. Thanks in advance.

author: tautech
author_rank: Super Contributor
timestamp: December 02, 2016, 06:49:49 am
content: Welcome to the forum.You'll need to download this to find the part #:http://elektrotanya.com/tektronix_2225_oscilloscope_sm.pdf/download.htmlWait for "Processing" to change to "Get Manual".Then with the part # you can maybe find one here:http://www.sphere.bc.ca/test/tek-transformers.htmlWhile you're at Sphere's site grab this too:http://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdfNow I had an old English CRO with the same symptoms and fault, no parts available but the HV transformer was luckily potted in a soft white RTV.Careful picking away at the potting and dismantling it found the break in the secondary in the first turn on the top layer.So it lost a turn and was reassembled and worked like a charm.Sorry can't remember the secondary resistance even as a guide for you but you can see that there might be another way out.Keep us filled in on how things go.

author: tggzzz
author_rank: Super Contributor
timestamp: December 02, 2016, 09:29:49 am
content: Don't forget to ask the question on the Yahoo TekScopes forum. There was a thread about rewinding HV transformers recently.

author: tech243
author_rank: Newbie
timestamp: December 02, 2016, 11:46:55 pm
content: Thanks tau tech and tggzzz for the replies. I've looked on qservice and sphere. They both sell the transformer for about $50aus but are out of stock. Have emailed whether they might get some soon. Also considering a rewind. The failed winding appears to be closest to the core out of 5 windings and seems to be bifilar and twisted. At least the part I can see without a teardown. I'll try for a replacement first.
Tektronix 2225 touchy switches - Page 1
Forum section: electronics / beginners

author: ramonest
author_rank: Contributor
timestamp: April 22, 2016, 09:50:45 pm
content: I got a Tek 2225 it has the cal label from 2007, and it seems to show the autocal properly. But the switches to change GND, AC, DC, of both channels are quite touchy. DC works fine, GND sometimes is hard to get it. But for channel 1 I can't get the AC mode to stay and on channel 2 is quite hard.Any ideas how to fix it? Is it possible to do so without opening the oscilloscope? Would it be possible to just clean them or would they need replacement? If so are they common or hard to find?Thanks!

author: danadak
author_rank: Super Contributor
timestamp: April 23, 2016, 12:53:25 am
content: If switch an open frame exposed switch contact cleaner (DeOxit), removescope cover and apply directly to switch.Regards, Dana.
Tektronix 2232 menu screens problem - Page 1
Forum section: electronics / beginners

author: dirty_glam
author_rank: Contributor
timestamp: November 06, 2013, 07:26:43 pm
content: Hi,I bought this oscilloscope a while back but when i bought it I just checked that it turned on and that it showed a signal on the screen using the probe adjuntment lead on the front panel. A few weeks ago I used it to test a signal generator and it seemed to be working fine but just today I noticed that it should have some information on the screen and show the menu, etc etc but i don't have that, I push the "display", "Advance functions", etc buttons and nothing shows on the screen.Is it possible that you can turn on and off this messages from the screen? if so, how can i turn them on? because I don't find a way to do it. And if it's broken, what is your advice? what should I look for?Thanks very much

author: ElectroIrradiator
author_rank: Frequent Contributor
timestamp: November 06, 2013, 07:51:37 pm
content: Check that you haven't turned the beam intensity for the on-screen display down. The scope has a readout intensity control separate from the two trace beams. Locate the outer sleeve of the second rotary control up from the power on button. Turn it clockwise.

author: dirty_glam
author_rank: Contributor
timestamp: November 06, 2013, 09:21:04 pm
content: Thanks, but that's not it. It was the first thing I checked and it does nothing, clockwise or counterclockwise :-(

author: ElectroIrradiator
author_rank: Frequent Contributor
timestamp: November 07, 2013, 01:06:00 pm
content: Unfortunately that is the only way I can think of permanently disabling the on screen display.

author: Switching Power
author_rank: Contributor
timestamp: November 07, 2013, 06:30:45 pm
content: If the beam intensity for the on-screen display is not turned all the way down the menu should work.If it not showing up something is broken and you have your first oscilloscope repair job.

author: Anks
author_rank: Frequent Contributor
timestamp: November 08, 2013, 10:19:34 am
content: Common issue with 22xx scopes. Its normally the lead to the intensity control a bad resistor or the pot itself but that normally is intermittent.
Tektronix 2230 question - Page 1
Forum section: electronics / beginners

author: Delillusions
author_rank: Contributor
timestamp: August 29, 2013, 05:47:50 pm
content: Hi!Sorry for interrupting all of you, but I have a question.The time has to for me to buy an Oscilloscope, and I found a Tektronix 2230 scope, with a reasonable price and in a very good shape.I know, that Tektronix is quite good manufacturer for O.Scopes. What are you're thoughts about this Scope?Actually I'm looking for scopes, that are at least 50MHz, or above, and it has to be Analog. I know the the 2230 is a digital storage and the digital storage only has 20Ms/s, but I don't need that part. If I need a digital scope, then I would buy a "true" DSO.This scope would be for me, and I need it in my little "workshop" at home. So it's not for professional use, it would be more accurate to say it's for semi-professional use.Thank you for you're help!Best regards!Del

author: dfmischler
author_rank: Frequent Contributor
timestamp: August 29, 2013, 05:57:38 pm
content: If the scope is working well, and you think it will meet your needs, and you think the price is OK, then what is the question?

author: Delillusions
author_rank: Contributor
timestamp: August 29, 2013, 06:12:35 pm
content: Thank you for you're answer dfmischler!To make it clear.This scope meets all of my current needs and more, so it should be good for a while. It works, and the price is good too and it's in a good condition.My question:Is this a good product?I read and heard things about this type of scope, but I would like to know, what people in this forum heard about this scope.Thank you again!

author: Rigby
author_rank: Super Contributor
timestamp: September 01, 2013, 12:03:52 pm
content: Yes, it's good. If you need an oscilloscope, the oscilloscope works, and it is a good price, then get it.
Tektronix 2235 AN/USM-488 - trace stability issue - Page 1
Forum section: electronics / beginners

author: F3nn3c
author_rank: Newbie
timestamp: April 29, 2018, 11:39:45 pm
content: Hello, forum members:I have acquired two Tektronix scopes a while ago, and finally decided to check a Tektronix 2235 AN/USM-488 in hopes to set it up as my bench scope.Good news - both A and B channels appear to be working, and trigger from an internal oscillator. Calibration also appears to be OK, the square wave follows the graticule markings both vertically and horizontally.Traces are rather bright and rather sharp, I can get them down to ~1mm in width.Bad news - trigger signal seems to be unstable. For no apparent reason trigger is being randomly lost, and the channel displays a baseline instead of a signal. Mostly happens on a B channel, but A is also affected. Also, both baselines when this happens are not clean, but rather rapidly pulsating/flickering both for A and B. After a couple of minutes the traces are back - stable and sharp...Does anyone have any suggestions/pointers as to where to look for a potential problem spot? Switches to clean? Transistors to reseat?Thank you,Dmitri

author: Jwillis
author_rank: Super Contributor
timestamp: April 30, 2018, 05:23:49 am
content: I would start by giving all the pots and switches a good cleaning with some Deoxit .Make sure all the connections inside are seated well. Thats probably all it needs .Looks like as nice scope .

author: David Hess
author_rank: Super Contributor
timestamp: April 30, 2018, 07:20:15 pm
content: Your photograph is too out of focus to read some of the control settings.Make sure P-P Auto is pushed in. Do not use the VERT MODE trigger source with ALT vertical mode; this is a special triggering mode only appropriate for overlapping signals. Instead use CH1 or CH2 trigger source or the external trigger source with another probe connected.
Tektronix 2236 Powers On but Nothing on CRT Screen - Page 1
Forum section: electronics / beginners

author: happylife5678
author_rank: Newbie
timestamp: September 29, 2022, 03:58:09 pm
content: I just got my first scope it's an old tektronix 2236 scope, it powers on, power led and a trigger ready led lights up, but I don't see any lights on or around the CRT tube screen. Is there a button/dial for the screen to light up? The multimeter reads 60.000xxx also. Please help!!!
Tektronix 2261 Oscilloscope manual needed - Page 1
Forum section: electronics / beginners

author: Vorlon
author_rank: Newbie
timestamp: June 27, 2014, 02:11:48 pm
content: Hi,I'm looking for the Tektronix 2261 oscilloscope manual or at least the schematics.Thanks for any information.

author: David Hess
author_rank: Super Contributor
timestamp: June 28, 2014, 12:16:39 am
content: Are you sure about that model number?

author: Vorlon
author_rank: Newbie
timestamp: July 20, 2014, 02:49:19 pm
content: Positive. It's a Y-Tektronix 2261 Oscilloscope.

author: w2aew
author_rank: Super Contributor
timestamp: July 20, 2014, 03:34:57 pm
content: Never heard of Y-Tektronix ?!?!?A knock-off possibly?

author: grumpydoc
author_rank: Super Contributor
timestamp: July 20, 2014, 04:08:00 pm
content: QuotePossibly.The posted picture seem to also be shown on this pagehttp://www.crystalradio.cn/thread-530233-1-1.htmlwhich has several more images.

author: elliott
author_rank: Regular Contributor
timestamp: July 20, 2014, 05:40:44 pm
content: That doesn't look like any 22xx I've ever seen, I don't think it is something Tektronix would allow their name to be put on.Check out the layout of this front panel, not an exact match, but pretty close.http://sinometa.manufacturer.globalsources.com/si/6008800647979/pdtl/Oscilloscope/1003232221/20MHz-Dual-trace-Universal-Oscilloscope.htmBetter picture.http://www.highlightelectronics.com.au/images/Oscilloscope/OscilloscopeFrontMoreDetail.jpgAnd the rear.http://www.highlightelectronics.com.au/images/Oscilloscope/OscilloscopeRear.jpg

author: David Hess
author_rank: Super Contributor
timestamp: July 20, 2014, 06:01:31 pm
content: Tektronix has or had an Asian distributor which marketed US designs including at least some of the 22xx series of oscilloscopes with a slightly different version of their name. The only example I have seen was from India and but it was a well known model unlike 2261 which I have never heard of.So they were knock-offs but official knock-offs.
Tektronix 2440 - Page 1
Forum section: electronics / beginners

author: MikeK
author_rank: Super Contributor
timestamp: May 19, 2012, 01:13:50 am
content: I found a Tektronix 2440 scope locally for under $200. Should I bother? I already have a Rigol DS1052E and would like to get an analog for my second scope, but this looked like a good deal.

author: Teneyes
author_rank: Frequent Contributor
timestamp: May 19, 2012, 03:41:27 am
content: Strange you don't see it is NOT an analog scope, slower DSOhttp://www.testmart.com/search/asp.cfm/DIGOSC/TEK/2440.html

author: MikeK
author_rank: Super Contributor
timestamp: May 19, 2012, 03:59:54 am
content: Sorry. I knew it's not an analog scope. I meant is it worth having since I already have a digital? The 2440 does have much more bandwidth.

author: T4P
author_rank: Super Contributor
timestamp: May 19, 2012, 08:19:21 am
content: Quote from: MikeK on May 19, 2012, 03:59:54 amYeah sure ... the ADC sampling rate is hopeless
Tektronix 2440 calibration - Page 1
Forum section: electronics / beginners

author: sgi199
author_rank: Contributor
timestamp: December 27, 2021, 09:23:21 am
content: Tektronix 2440 Find calibration uncald CTE cal method6 DIV? thank!

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: December 27, 2021, 01:21:54 pm
content: PG506 fast rise output, max amplitude thru 50 ohm cable, 5x 50 ohm attenuator and dual input coupler.Jeff

author: sgi199
author_rank: Contributor
timestamp: December 27, 2021, 03:47:23 pm
content: prepare.....Jeff eelcr Thanks!

author: David Hess
author_rank: Super Contributor
timestamp: December 27, 2021, 04:19:03 pm
content: The output from an HCMOS logic gate is fast enough. If you have a sync output on your function generator, then that can do it.The oscilloscope performs the same two channel delay time measurement as shown in the measurements menu if you want to test it ahead of time.

author: sgi199
author_rank: Contributor
timestamp: December 27, 2021, 04:32:39 pm
content: I'm a manipulator, layman. I have nothing to learn! Thank you, two masters!:-+David Hess :-+Thanks

author: David Hess
author_rank: Super Contributor
timestamp: December 27, 2021, 08:31:22 pm
content: I learned it after I changed the Dallas nvSRAMs in my 2440 and had to do the external calibration myself without the proper test equipment. I tested a couple of different "fast" sources for the delay test and they were not critical at all.

author: sgi199
author_rank: Contributor
timestamp: December 28, 2021, 08:23:42 am
content: Well... I haven't found the right instrumentI re recognized several error messages in SPECIAL-COLD-SEF, and the results were all passed in the main menu.include 2430A/2440
Tektronix 2465B 50 Ohm Overload - Page 1
Forum section: electronics / beginners

author: Sublimis
author_rank: Newbie
timestamp: October 22, 2016, 09:29:27 am
content: I was curious if any one could give me some insight on trying to find the root cause of this error. I had my scope turned on no probes about 5 min the scope threw this error. Now when I put a probe on and put it on the probe cal on the scope, doesn't matter the channel and switch it to 50 ohm DC it throws the error after about 5 seconds. I have been talking to a person here and there and has been helpful in some ways but I'm new to this and not sure where to look for some of the items that he stated. He told me to look for cracks in the 50Ohm and thermistor are these in the attenuator? Totally new to this and I appreciate any help.

author: tggzzz
author_rank: Super Contributor
timestamp: October 22, 2016, 10:05:04 am
content: This is a duplicate posting.https://www.eevblog.com/forum/repair/tektronix-2465b-50-ohm-overload-76215/I suggest people reply to the other thread, so as to avoid wasting time and poorly duplicating effort.

author: tautech
author_rank: Super Contributor
timestamp: October 22, 2016, 10:32:04 am
content: Quote from: Sublimis on October 22, 2016, 09:29:27 amIt's appropriate to reply to this in the Beginners thread.You're using it wrong.50termination is NOT intended for use with a passive probe. Period.Get the Operators manual off the net and have a study up.Use the standard input impedance of 1 Mfor all passive probe work.

author: danadak
author_rank: Super Contributor
timestamp: October 22, 2016, 08:12:00 pm
content: Example probe for 50 ohm environment -http://www.tek.com/datasheet/low-capacitance-probe/p6150HP also had a series of probes for 50 ohm, with 100K Zin, passive.Regards, Dana.
tektronix  442 oscilloscope....need probes - Page 1
Forum section: electronics / beginners

author: golash
author_rank: Contributor
timestamp: November 03, 2014, 01:19:07 am
content: HiI have a tektronix 442 oscilloscope. I hope to use it to tune my dc servos. The scope as it is has no probes.I did a search but I haven’t located anything. Hoping for some help. PS what year was this scope manufactured.Thanks

author: w2aew
author_rank: Super Contributor
timestamp: November 03, 2014, 01:29:15 am
content: Quote from: golash on November 03, 2014, 01:19:07 amJust about any 10x probe whose compensation range includes the 30pF input capacitance will work fine.

author: golash
author_rank: Contributor
timestamp: November 03, 2014, 01:30:39 am
content: Thanks for your help.
Tektronix 464 - Page 1
Forum section: electronics / beginners

author: Zorix
author_rank: Newbie
timestamp: November 19, 2012, 05:30:13 pm
content: Hi everyone. New here, thought I would ask what everyone thinks of this scope. I have some experience with electronics and I can make simple repairs and simple designs. I have recently got a great deal on a Tektronix 464 which was not working. Turns out it was an easy fix and it seems to work just fine. I was wondering what everyone thinks of this model and what I should be aware about with it. Thank you!

author: w2aew
author_rank: Super Contributor
timestamp: November 19, 2012, 09:22:33 pm
content: Quote from: Zorix on November 19, 2012, 05:30:13 pmIt is basically the storage version of the venerable 465 - which was one of the most popular analog oscilloscopes that Tek ever made. Even if the phosphor storage feature doesn't work well, the scope is still a very usable analog scope. The 465 was (and still is) very popular. It dates back to the late 70s, early 80's. Mine is still going strong.
Tektronix 465B oscilloscope repair - Page 1
Forum section: electronics / beginners

author: RetEngr75
author_rank: Newbie
timestamp: November 20, 2016, 04:30:45 pm
content: I just bought this unit on Ebay. I opened and read the manual about checking voltage and settings before powering up.I used oscilloscopes before but not this particular one. After the background read, I plugged it in.It came up with one horizontal line raster. I began to look at the controls for the 2nd channel and it went out,shut off no lights any where. I pulled the plug and checked the main 1 1/2 fuse and it was open.I then bought replacement fuses marked 1.5 amp but they opened as soon as I powered up.I tried a 2A fuse and it came up and I quickly shut it down hoping not to cause further damage.I am at a loss for the next step and appreciate any suggestions even repair locations near Bethlehem Pa.Rich

author: tggzzz
author_rank: Super Contributor
timestamp: November 20, 2016, 04:42:16 pm
content: The good point is that you saw a trace for a while, which means the CRT, the 3kV and 17kV PSU are probably OK. The principal cause is probably a capacitor that has shorted out.look at the many other threads on this subject on this forumget the service manual, preferably one for the specific serial numberfollow the PSU troubleshooting sectionmeasure the low voltages and their ripplefollow the service manual w.r.t. the "balance node", which will indicate which PSU rail is faultyreplace the relevant capacitors, and any associated components they have destroyed

author: RetEngr75
author_rank: Newbie
timestamp: November 22, 2016, 12:59:16 pm
content: Thank you for your advice. I did get the service manuals but there is nothing about where to start when the unit blows the power fuse. I looked at the power supply schematic and checked some obvious input short possibilities and that looks ok. Don't want to open the case just yet. Thinking about using the larger fuse so I can open unit and measure voltages.

author: tggzzz
author_rank: Super Contributor
timestamp: November 22, 2016, 01:31:58 pm
content: Replacing a fuse with a nail is usually, um, destructive!Open the case and visually inspect each component. Look for heat damage and chemical damage.Use a multimeter to measure resistances near the input, input rectifiers, input capacitors, input rectifiers.You'll probably find a failed capacitor is a short circuit and/or has caused another component to fail.If you really want to apply power and see what gets hot, then use a variac and slowly ramp up the voltage.

author: mzacharias
author_rank: Frequent Contributor
timestamp: November 24, 2016, 12:46:42 pm
content: Jim Williams fixes a 465B with a bad tantalum cap loading down a power supply rail.Anyhow, unloading power supply lines, one by one, ought to point you in the right direction.
tektronix 465b problem - Page 1
Forum section: electronics / beginners

author: jsblues81
author_rank: Contributor
timestamp: August 17, 2023, 03:40:29 am
content: My 465b has the following problem...the waveform is reduced with the waveform in from the left side of the screen (it doesnt stretch across the screen from end to end) it starts and end never reaching the far left and far right of the screen. As if it was displayed on a smaller screen than the one its currently on. I hope I explained that right...any ideas...the -2450v is ok.

author: tggzzz
author_rank: Super Contributor
timestamp: August 17, 2023, 11:21:44 pm
content: Quote from: jsblues81 on August 17, 2023, 03:40:29 amInsufficient information.How much experience with scopes do you have?Is this a change?Can you useanycontrols to move the beam to the left/right/top/bottom of the CRT?Picture of screen plus control settings would be sensible.

author: jsblues81
author_rank: Contributor
timestamp: August 19, 2023, 02:56:33 am
content: I am a trained electronic tech with experience of over 50 yrs...I have serviced scopes both vacuum tube ,analog and digital for many years...as far as the controls...no the waveform do not reach the far left or right horozontaly but vertically it goes all the way up or down. The horz sweep is fine and matches perfectly with another unit I have that functions perfectly. I'm beginning to think there is an issue with either a dirty trimmer or worse, the hv anode supply. I will post a screenshot soon.

author: tggzzz
author_rank: Super Contributor
timestamp: August 19, 2023, 08:09:11 am
content: Quote from: jsblues81 on August 19, 2023, 02:56:33 amThat's a more useful characterisation of the situation.I presume the vertical deflection is roughly correct, since you don't mention anything to the contrary.I presume all the PSU voltages are correct, since you don't mention anything to the contrary.Since the beam can reach the top and bottom of the screen I doubt it is the HV supply.In that case it is only the horizontal calibration that is faulty. Follow the procedures on p4-53 of the service manual.

author: jsblues81
author_rank: Contributor
timestamp: August 20, 2023, 02:00:15 am
content: I'm sure you are not far off. Yes all pwr supplies are perfect. I scoped tp4217 on the horz crt circuit and the waveform ( a 50% duty cycle square wave) on the working unit is not the same on the unit in question. It has approx 2x the repetition rate, is lower in amplitude by half and the DC levels are smaller...by about half. I tried to photograph the waveforms but the freq caused the waveform to flash and I couldnt get a proper shot. Here however is screenshots of what the problem looks like...hope this helps.
Tektronix 475A Help! - Page 1
Forum section: electronics / beginners

author: XMA
author_rank: Contributor
timestamp: April 03, 2018, 05:38:38 pm
content: Hello, guys so I today bought a Tektronix 475A for $40 but it got problems that make me regret buying. so here a list of problems, and please help me out with fixing it.1 - Back fan supper load for no reason.2 - aligning the horizontal axis is really broken like if I try to align, it will jump across and will make a really small change. and with that, it will jump back and forward if u don't find a good spot and that good spot is still very good.3 - I can't seem to get a clear view, I do focus but it doesn't help much, and as u can see in the picture the square wave is really not clear, u can only really see the top and bottom.4 - whenever I change the time per division knob, the signal starts to double and I cant get a single clear signal, i need to find a perfect division spot for it to not double.

author: james_s
author_rank: Super Contributor
timestamp: April 03, 2018, 06:55:02 pm
content: It sounds like the main problem is that you need to learn to properly use the the instrument before assuming that it's defective. You're trying to measure a signal with a high bandwidth scope using a clip lead rather than a proper 10x scope probe, what you're seeing is pretty much what I'd expect. Try enabling the BW Limit and it should get a lot less fuzzy, although you'll still get some fuzz without using a good probe. The probe and probing technique is very important, more so the higher the bandwidth of the scope.For the issue you get when adjusting the time scale it sounds like you aren't setting up the triggering properly.For the horizontal jumping around you might have a dirty pot, but do realize that the control has both course and fine adjustment on a single knob, if you turn it past a point it will make a much larger change.

author: Old Printer
author_rank: Frequent Contributor
timestamp: April 03, 2018, 07:34:59 pm
content: Also, you do not have the grounding clip attached to the scope ground. You can use the outer ring on the external trigger BNC connector.It looks like a pretty clean unit, and you are getting a trace, so for $40 bucks it looks ok so far.Get on YouTube and have a look at Alan's videos. He is pretty much a TEK scope guru. Watch every scope vid you can find, I promise it will be worth your time.https://www.youtube.com/channel/UCiqd3GLTluk2s_IBt7p_LjA
Tektronix 475M var knob wont click off  - Page 1
Forum section: electronics / beginners

author: nrgeek
author_rank: Contributor
timestamp: January 27, 2012, 12:26:29 am
content: Ive got a 475M .. I cant get the red var on the A and B time/div knob to click off by turning to the right .. tried left in case was different than the channel 1 and 2 var knobs .Nope ..calibration light is still on .. no click .. anyone here that is very familiar with this model scope care to chime in on a solution !?Much appreciation in advance !Sean

author: jgbena
author_rank: Contributor
timestamp: January 27, 2012, 08:12:25 pm
content: Well it sounds to me like there is something wrong "Mechanically" with the pot. I would open it up and see whether or not you can see movement at the pot at all... the reason i say this is that you cant feel the click... makes me wonder about the pot itself. They do sell replacements for these.. i will have to dig around to where i saw one recently.

author: nrgeek
author_rank: Contributor
timestamp: January 27, 2012, 09:24:49 pm
content: Yea I just found one myself .. and its here in tn Qservice they sell Scarce and obsolete parts to restore your old test equipmenthttp://www.qservice.tv15.00 for new or 12 fir used tested.. I will spend the other 3 bucks

author: Chris Wilson
author_rank: Super Contributor
timestamp: January 27, 2012, 11:23:48 pm
content: I have my 475 in bits, if you need photos just ask. I have just looked and it's driven by a muff coupling with Allen screws in to lock the long shaft to the input shaft of the pot. have they come a little loose? If not I can't see what else it could be other than a mechanically defective pot itself.

author: nrgeek
author_rank: Contributor
timestamp: January 28, 2012, 12:50:13 pm
content: I took the case off , this morning , and its not the pot part number I thought it was .. the only thing other than finding one .. and looks like it may be tough .. is to take out set screws ( loosen ) .. take of the pot . of course marking the position, and seeing if it turns off by hand .. if not gonna have to find part number 311-1793-00 and so far on the net .. its a no go on that part number including ebay .. someone has got one sitting around on a shelf or in a dead machine .. I just gotta hook up with that personAttached a pic of the pot in case anyone curious loland the red var knob that is attached to that pot

author: nrgeek
author_rank: Contributor
timestamp: January 29, 2012, 11:55:43 pm
content: I finally found one .. took post on TekScopes yahoo group to locate someone that had a spare they would part with .Ashley over athttp://www.kiss-electronics.com/Cornelius, Oregon hooked me up with what I needed! They specialize in repair and refurb of old boat anchor test equipmentThank you Ashley ..

author: jgbena
author_rank: Contributor
timestamp: January 30, 2012, 04:47:20 pm
content: That's awesome!Nice to know you can still get parts for these things. I got pretty lucky on mine.. it works great but you never know what the future holds.. spare parts is a good thing!I'm just getting back into it as well so im looking forward to learning as much as I can!
Tektronix 492AP extenders - Page 1
Forum section: electronics / beginners

author: WA1ESO
author_rank: Newbie
timestamp: April 07, 2022, 07:17:21 pm
content: Tektronix 492AP extendersNow producingTektronix 492AP Four Board Extender SetExtender board needed to troubleshoot and repair the Tektronix 492AP Spectrum Analyzer.Dupont style 1.50 inch pitch connectors are used on these boards to match motherboard and plugin boards of the 492AP.Two 6X2 extenders 4 inches in height.Two 12X2 extenders 4 inches in height.For more information email WA1ESO@Juno.comWA1ESO(at)Juno(dot)comThank youJohnWA1ESO
Tektronix 547 Oscilloscope - Page 1
Forum section: electronics / beginners

author: Knox_Harrington
author_rank: Newbie
timestamp: December 14, 2018, 08:33:36 pm
content: Hello everyone. So I just picked up this Tektronix 547 scope. I don't know too much about it, but it doesn't seem to be working like the ones I've come across in other Youtube videos. I was hoping someone on here could help me test it or point me in the right direction? Below is a video I took of it powering on for about 45s. Thanks in advance for any replies.

author: Wimberleytech
author_rank: Super Contributor
timestamp: December 14, 2018, 08:52:38 pm
content: Did you try to turn the "Intensity" knob? Set the trigger mode to "auto."

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 15, 2018, 12:28:51 am
content: Look at the 4 lights above the CRT, they are telling you the trace is far below the screen, which either means the position control of the plugin needs adjusting, or the plugin might need repairing if the position control does nothing.The other light tells you the trace is also way off to the left, which means the time base is not triggered, or the horizontal position control on the mainframe needs adjusting.Please be aware that the 547 has the ability to throw a lot of brightness on the CRT, so much so that it can permanently burn the screen.So keep the intensity down, at 4 or below. You can also keep it out of focus on purpose to prevent the beam being too powerful on one spot.It's a nice scope. Lots of work to keep going at first. Tunnel diodes drift over time and some circuits may not work properly anymore.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: December 15, 2018, 11:24:44 pm
content: RTFM. It will explain how to set the controls for basic display and what all the little lights mean. Once you've got a trace on screen (or fail to get such using the manual's setup) then we can proceed.http://w140.com/tekwiki/wiki/547

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: December 17, 2018, 03:27:37 am
content: Another good resource is this:https://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf

author: madao
author_rank: Frequent Contributor
timestamp: December 18, 2018, 05:14:17 pm
content: heat it up and wait for few minutes, because vertical amplifier must be warmed up.Trigger from Timebase A should be switched to "AUTO"Horz-Display should be schwitched to "A"And 1A1 Plugin, schwitched to "chop"Both (vert) Postition-Knobs on 1A1 Plug-in should stand be middle.and turn itensity pots carefully, if you see only light-fog. Look that, postition-lamps and turn Horz or Vert-Postition-knobs.If you doesn't seeing a trace. That pleas check their power supply on accuaray.It is normal, this unit has someone little fault after long sleep.YES, very carefully with intensity pot, CRT Brightness is very strong. If CRT is good, it is possible showing visible trace on fastest sweep with low repetion rate. I tell from repetion rate of 10-50 hz !! This is also why, old tektronix is superior.
Tektronix 7633 Probe question - Page 1
Forum section: electronics / beginners

author: scknight
author_rank: Newbie
timestamp: October 20, 2012, 01:29:07 am
content: So I just bought a Tektronix 7633 100Mhz Oscilloscope with 7A18 7A26 7B53A modules. I got it for 50 bucks and it seemed like a good deal.This is my first oscilloscope, so I was wondering if anyone could tell me what kind of probes would be best and if there's a good place to get them from.Thanks!

author: c4757p
author_rank: Super Contributor
timestamp: October 20, 2012, 03:36:59 am
content: I have these:http://www.amazon.com/100MHz-Oscilloscope-Clip-Probes-Accessory/dp/B0030KWM30/ref=sr_1_1?ie=UTF8&qid=1350704036&sr=8-1&keywords=oscilloscope+probeThey're cheap but good. No need to spend a ton on probes when you bought a $50 scope.Oh, and by the way? That old scope looks amazing. I love old test gear. The 7633 isn'tthatold, but it's got "the look". I want it.

author: vk6zgo
author_rank: Super Contributor
timestamp: October 20, 2012, 03:37:21 am
content: Basically,any type of probe would be OK,bearing in mind that the "cheapo" new probesarecheaply made,so may fail sooner,or have lower specs than genuine Tektronix,probes,or probes from other major manufacturers.One advantage of some Tek probes,is that the 'scope can detect whether you are using a X10 or X1 probe,& set the "on screen" v/cm display to correspond.(That said,I'm not sure if the 7633 has such a display--the 7613 does).Obviously,with other probes,including some Tek ones,this doesn't happen,& you need to calculate the correction in your head.You may find second hand probes by Tek,HP,Siemens,Philips,BWD,Telequipment,& a number of other legitimate manufacturers on eBay,or at Hamfests,etc.All of these will do a good job for most work,as will the "cheapies".

author: Unknown
author_rank: Unknown
timestamp: October 20, 2012, 04:58:43 pm
content: For 10x probes, make sure the compensation range includes the 20 pF input capacitance of these vertical plugins (7A18, 7A22), although the far majority of them will compensate to 20 pF. You definitely want 10x probes, and might want 1x (or switchable 10x/1x) probes for low level work (eg. audio, power supply ripple) where you don't care about circuit loading or bandwidth. To make full use of the mainframe's bandwidth, the probe bandwidth should be at least 100 MHz.I would buy at least three probes (one per vertical input), and might get one for external trigger. More information:Choosing a probe.

author: scknight
author_rank: Newbie
timestamp: October 20, 2012, 06:02:34 pm
content: Thanks for all the great information!
Tektronix DMM912 in circuit capacitor testing.  - Page 1
Forum section: electronics / beginners

author: Sebzy
author_rank: Contributor
timestamp: March 24, 2013, 03:53:41 pm
content: Have a Tektronix DMM912 which seems to have a capacitance test mode but am unsure if it can be used to test capacitors in circuit reliably.The manual is quite vague as all it states is"CAUTION. Remove all power from the circuit and discharge capacitors before connecting the test leads.Remove capacitors from circuitry for best results. If your software version is 1.90 or below, use SETUP mode to select 60 Hz noise suppression for all capacitance measurements."

author: Unknown
author_rank: Unknown
timestamp: March 24, 2013, 06:47:53 pm
content: Few (if any) capacitance meters will measure capacitance in circuit with any reliability. Caps or resistors in parallel will screw up your measurements, especially the simplistic scheme most DMMs use. Just desolder on leg of the capacitor you want to measure.
Tektronix List of oscilloscopes - Page 1
Forum section: electronics / beginners

author: JustAnotherGuy999
author_rank: Contributor
timestamp: February 26, 2016, 07:54:20 pm
content: Plz if you have a link to a list of all tektronix osciloscopes, and their release dates, share it

author: Andy Watson
author_rank: Super Contributor
timestamp: February 26, 2016, 07:58:47 pm
content: http://w140.com/tekwiki/wiki/Main_PageYou might also try asking on the Yahoo Tektronix group.

author: JustAnotherGuy999
author_rank: Contributor
timestamp: February 26, 2016, 08:01:48 pm
content: thanks andy (y) (y)

author: AF6LJ
author_rank: Unknown
timestamp: February 26, 2016, 08:29:22 pm
content: Good Stuff Thanks for passing that along...

author: JustAnotherGuy999
author_rank: Contributor
timestamp: February 26, 2016, 09:24:03 pm
content: actually i wanted an ordered list (date: released oscilloscope(s)), it would be very interesting

author: Electro Fan
author_rank: Super Contributor
timestamp: February 26, 2016, 09:31:31 pm
content: https://en.m.wikipedia.org/wiki/Tektronix_analog_oscilloscopes

author: JustAnotherGuy999
author_rank: Contributor
timestamp: February 26, 2016, 09:36:39 pm
content: Electro fan this is just a list of analog oscilloscope, i wish there is a comprehensive one with all oscilloscopes made by tektronix sorted by date and not by series

author: Electro Fan
author_rank: Super Contributor
timestamp: April 13, 2016, 08:53:08 am
content: Not comprehensive for all the series but in the 2000 section it has some dates.Models were introduced according to the Tektronix catalogs:1982 (first models) 2213 2215 2335 2336 23371983 no new models1984 2235 2236 2445 24651985 2213A 2215A 2235L 2236/01 2465CTS 2465DMS 2465 DVS1986 2220 2230 24301987 2225 2245 2246 2430M 2445A 2455A 2465A 2465A-CT, -DM and -DV 24671988 2235/01 2246/1Y 2430A1989 2201 2205 2210 2245A 2246A 2246/1Y 2247A 2402 2432A 2440 2465B 2445B 2465BCT 2465BDM 265BDV 2467B1990 2211 2232 2235A 2235A/01 2235L 2236A 2431L1991 2221A 2252 2402A 2439 2467BHDBy 1994, the decline had started, no new 2000 models being listed after that, and by 1996, only the 2430A, 2440, 2465B and 2467B were being offered. The TDS series had completely replaced the 2000 series.The 2247 and 2252 are very similar. The difference is that the 2252 has printing and programmable setups, useful in many applications. Both are excellent scopes.

author: Electro Fan
author_rank: Super Contributor
timestamp: April 13, 2016, 09:04:09 am
content: 7000 dates:http://www1.tek.com/Measurement/cgi-bin/framed.pl?Document=/Measurement/Support/faq/history.html

author: danadak
author_rank: Super Contributor
timestamp: April 13, 2016, 10:55:18 am
content: A collection of catalogs, you could make up an order list, and share it with thecommunity.http://w140.com/tekwiki/wiki/Tektronix_CatalogsRegards, Dana.
tektronix oscilloscope need something to test. Novice Question - Page 1
Forum section: electronics / beginners

author: golash
author_rank: Contributor
timestamp: February 08, 2015, 10:04:53 pm
content: Hi AllJust got my first scope..a tektronix 442. I am just getting familiar with the controls. I tested a battery thatwas very exciting. I don`t have any circuits that I can test. Can someone think of a household device I can use.I`d like to see a square wave form.Thanks

author: Paul Moir
author_rank: Frequent Contributor
timestamp: February 08, 2015, 10:12:27 pm
content: Well, you don't have to go far. There's a little spot just to the right of the CRT marked "Probe Adjust", which is used for compensating your oscilloscope probes (10x probes, 1x can't be compensated, and are very low bandwidth.) Connect your probe there and you should see a square wave.

author: golash
author_rank: Contributor
timestamp: February 08, 2015, 10:23:09 pm
content: Ok GreatI`m not near the scope at the moment. Do I just touch the probe or is there an additional spot for the ground.Yes I know. I am a absolute beginner.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: February 08, 2015, 10:32:51 pm
content: Try just touching it with the probe tip. It shares the same ground as the oscilloscope so the circuit will be made that way.If you see some fuzzyness in the trace when you probe it this way, that's caused by interference. The reason you're getting it is from the bad grounding of the probe. In this case attach the ground lead on the probe (the bit with the alligator clip) to a nearby piece of metal on the oscilloscope and see if it improves.Some very good information on probes:(Everything w2aew has up about oscilloscopes is well worth watching)

author: golash
author_rank: Contributor
timestamp: February 08, 2015, 10:56:11 pm
content: Hi PaulThanks for the information. Much appreciated.

author: tautech
author_rank: Super Contributor
timestamp: February 09, 2015, 05:48:00 am
content: Quote from: golash on February 08, 2015, 10:04:53 pmHave you got a manual?Google will find you a free one.Build yourself a simple 555 timer circuit, you'll have triangle, square, hi, lo and some more depending on how you set it up.Good to get you started and safe to experiment on/with.Logic gates can be good too, with fast risetimes and for making oscillators.Enjoy, your first scope is a special time.
Tektronix RSA306 (or possibly any spectrum analyzer) question - Page 1
Forum section: electronics / beginners

author: chiplukes
author_rank: Newbie
timestamp: August 30, 2017, 10:25:46 pm
content: Hello,We are attempting to do some in house pre-compliance conducted emissions testing and I stumbled across the following phenomenon with the Tektronix RSA306 that we are using. As I decrease the RBW setting of the spectrum analyzer I actually see signal peak amplitudes decrease. I expected to better resolve any peaks, but not see any amplitude changes... My (possibly flawed) understanding of spectrum analyzers is that decreasing the RBW should typically do the following:1) increase frequency resolution2) decrease the noise floor3) increase the sweep time (or in this case increase the #FFT points)My attached plot of data taken from the RSA306 shows that as the RBW is decreased, any particular peak is decreased in amplitude as well.Any thoughts or explanations about what I should expect (or what could be going wrong)?Regarding the setup, I have a typical conducted emissions setup (TekBox LISN, metal ground plane, Isolation Transformer ...). Basically, what was described in the in the TBLC08 user guide. The RSA306 reference level is set to 70dBuV and the span is 150KHz to 30MHz.Thanks,Chip

author: KE5FX
author_rank: Super Contributor
timestamp: August 30, 2017, 10:54:47 pm
content: If your signal is wider than the RBW filter, then part of it is by definition outside the RBW. That part can't contribute to the observed amplitude.Most EMI sources don't have very narrow bandwidths (aka 'line widths'), so you would expect this to happen at some point with almost any signal noisier than the spectrum analyzer's own local oscillator.

author: chiplukes
author_rank: Newbie
timestamp: August 31, 2017, 12:20:17 am
content: That makes total sense. Thanks for the help!I suppose that if I had gone the other direction with my RBW adjustment and observed the eventual amplitude stabilization I would have been given the clue I needed to figure this one out!
Tektronix TDS2024B scope for $110 good deal? - Page 1
Forum section: electronics / beginners

author: poot36
author_rank: Frequent Contributor
timestamp: May 23, 2015, 02:28:23 am
content: I have the opportunity to get this scope and am wondering if this would be a good upgrade from my Tektronix 465 scope? I do not know if it comes with probes or not. I am mostly interested in digital logic circuit repair (broken SNES) as well as serial protocol debugging (SPI, I2C) and voltage rail ripple measurements. Would this be a good scope to get for that?

author: tautech
author_rank: Super Contributor
timestamp: May 23, 2015, 02:43:47 am
content: It's a basic sound scope and IMO good value for $110.Won't do decoding though.Good step going forward from a CRO.

author: poot36
author_rank: Frequent Contributor
timestamp: May 23, 2015, 02:58:29 am
content: Ok, Thanks for the advice. Could I use the USB port on the front to save a waveform and then use a program on my computer to decode it?

author: miguelvp
author_rank: Super Contributor
timestamp: May 23, 2015, 03:04:35 am
content: Quote from: poot36 on May 23, 2015, 02:58:29 amIt's on the planed state for sigrok, but not sure if when they implement it it would do the decoding, but the same is true for other scopes and people have been able to do it somewhat manually.http://sigrok.org/wiki/Tektronix_TDS2024B

author: Fsck
author_rank: Super Contributor
timestamp: May 23, 2015, 03:15:54 am
content: Quote from: tautech on May 23, 2015, 02:43:47 amI say good deal as well. the "c" version of the scope is "current"(lols! crappy specs compared to its competitors, especially that woefully inadequate memory) and retails for like 2k$ USD.

author: pickle9000
author_rank: Super Contributor
timestamp: May 23, 2015, 03:38:31 am
content: It's a good deal.As for serial decoding get a 10 buck Saleae knockoff, put Sigrok on it to be legal and there you go. That's 10 bucks Canadian!http://www.ebay.ca/itm/24MHz-8CH-USB-Logic-Analyzer-Compatible-to-saleae-/190956566562?pt=LH_DefaultDomain_0&hash=item2c75e5f822
Tektronix TDS5034B, TDS5054B, and TDS5104B - Page 1
Forum section: electronics / beginners

author: RCHRDM
author_rank: Regular Contributor
timestamp: June 25, 2016, 05:26:36 pm
content: I am looking at a TDS5000 series scope to possibly buy for maybe $800. Does anyone have any opinions?

author: JPortici
author_rank: Super Contributor
timestamp: June 25, 2016, 07:28:03 pm
content: >>> the buy/sell/trade section

author: RCHRDM
author_rank: Regular Contributor
timestamp: June 25, 2016, 10:46:10 pm
content: Thanks.