Thank you for doing this video, it is a lot of work. The next comment is late, but it might help others doing amplifier tests. The reason your reciever exceeded its spec by so much was your testing only 1 channel at a time. Marantz specified the 2015 receiver with both channels running at full power. The FTC amplifier ruling of 1974 also specified that both channels had to be at full power when specifying power output and distortion. The reciever should still exceed spec, but not by as much.
It's a logic analysis system with oscilloscope cards plugged in to it, making it a digital oscilloscope. These HP systems can handle the digital and analogue domains together, and correlate measurements between them, which is really neat. So it can be both a logic analyser and an oscilloscope, and other things, depending on what cards are installed.
I don't know for certain, but I do remember seeing a few odd characters in places I'd expect to see box drawing. However, I didn't spend any time fiddling with the terminal settings to try and optimise it.
Another neat way to find such faults is to simply pass a dc current through the cable and observe it with a thermal camera, or even just feel where it gets warm. For greater effect just increase the current until it smokes at the location of the fault :-)
I've used that technique to find shorted components on a PCB. If you get the current right, the offending part will either catch fire or desolder itself and drop off the board...
Good evening, thank you for your response, I have a Metrix GX5000 this device will not do it like the Tektronix. Hello hunting for the Tektronix CSA 803A. Good evening.
Good morning, Nice video, very explanatory for the left and right side. I have this type of oscilloscope, but can you tell me which pulse generator you are using when connecting. Thanks in advance. Good day Skop
Thank you for your comments on the video. The pulse generator I used is a Tektronix SD24 sampling head fitted in a CSA803A mainframe. Its pulse risetime is about 20ps, so it's a pretty good reference for checking oscilloscope risetime.
Если пропадает сигнал на канале, как у вас, щёлкать обычно бесполезно. Там в переключателе чувствительности плата керамическая. Вроде хотели как лучше сделать, а получилось... А получилось, что они часто трескались при притягивания к корпусу блока. Тут надо разобрать блок, найти, какие проводники лопнули на плате, и запаять их.
I didn't. The old chip had already failed and lost its data. I fitted a blank FRAM and went through the scope calibration procedure. It worked fine, and I'm still using the scope today.
I have one of these but it did not come with probes. Can you tell me what probes will work with it? I’m relatively new to o-scopes and there are many probes available.
You can use any probes you like, more or less. The 2465A would originally have been supplied with some smart Tektronix ones rated for the full 350MHz bandwidth, but there's no point in searching for those. For everyday use, the cheap 10x probes available on eBay (I'm using some here labelled "P6100" with my 2465 right now) are perfectly adequate. You'll need to adjust the high-frequency compensation using the little adjuster screw on the probe or plug - read the scope or probe manual to learn more. If you want to get in to accurate really high-frequency (>50MHz) measurements, then you can start worrying about better probes, but it's a complex subject and is about more than just the probe.
David, I'm glad you enjoyed the video. I'm afraid I won't be able to walk through the calibration process because I sold the analyzer a long time ago so I don't have it any more.
You did the "Set Level" process very different than other videos on here, also made by reputable audio/engineer guys. Now I am not sure which method to follow :(
I think I may have done the 'set level' process wrongly. I've just checked the manual and in paragraph 3-19 j it states that for a percentage distortion measurement the level should be set to full scale on the meter. I set it to 0dB so my distortion reading will be lower than it should be, but in any case it's clear that the amplifier's distortion is lower than that of the oscillator and distortion meter combined, so it exceeds its specification.
That sounds normal. At those slow sweep speeds It'll only show you the trace when it's captured a complete sweep, which at 5ms/div takes 100ms (I think the sweep is 20 divisions wide) so it will appear rather slow. That's normal for digital scopes. If you've got any of the averaging features on it'll be even slower. At even slower sweep speeds (<50ms/div? I can't remember) the scope will go in to roll mode and you'll see the trace immediately but moving right to left, like a paper chart recorder.
How do you hook up the oscilloscope to the component under test? or is it not necessary? How do you do the testing of the item you are trying to troubleshoot? that is what i want to know but there are no videos showing it they all show the same thing like this person is doing.
This video is just a demonstration of the oscilloscope and that its features are working as they should. I made it because I was selling the oscilloscope and wanted to show buyers that it worked properly. How to use those features to examine and troubleshoot an electronic circuit is an enormous topic, and not one that could be covered in a 10-minute video. The key is to learn some basic electronics and understand what to expect at various points in a circuit. The oscilloscope allows you to see what's going on, and it's then up to you to compare that with what you think ought to be happening.
Picked my 2465a up yesterday. What a scope. As you say, Tek certainly knew how to build these practically bullet proof machines! Have to change out the caps on the LV PSU and also the nv-ram battery... Love how they were also made in Guernsey. About 40 miles away from me. Never knew they had a facility on the island 👍
You're quite right. My bad. I've just checked the manual again and in paragraph 3-19 j it clearly states this, so my distortion measurement is lower than it should be. In any case it clearly shows that the amplifier's distortion is lower than that of the oscillator + meter combination so it's still meeting its spec, but I'll remember for next time.
Thank you for the nice to the point no nonsense video. I have the 7704 main frame. This was a nice review. Is it really a 4 channel scope since you can't display all 4 channels at once??
No, this is an analogue scope which can only view signals in the time domain. It doesn't digitise the signal and therefore cannot perform an FFT on it.
Is there a wire necessary to connect the two together? I own a 16500B however it does not have this pair of cards and I'm planning to potentially buy them separately.
Yes, some wires are necessary to connect the 16530A and 16531A cards. From memory they're just standard 10-way 0.1" pitch IDC headers, and I think there are two or three of them. If they don't come with your boards, they'd be easy to make from standard parts.
Oof, between the expansion mesh the microchannel plate, that's one complex CRT. Got a 1000x probe good to 12kV? I'd start looking at all the HT potentials on the CRT. First guess is there's something off on the relationship between the gun/focus assembly & the Expansion mesh, or between the expansion mesh and the microchannel / faceplate assembly. Those Tektronix CRTs were really nothing short of witchcraft. We're fortunate to have examples of them in our collections, because nothing like them will ever be made by mankind again.
Yes. I've got an EHT probe but it's in another country at the moment! Good thing it's not here because I haven't really got time to look at this right now. My main worry is that something in the CRT has got damaged when the scope was manhandled up in to the loft for storage and then taken down again. Fingers crossed that's not the case. I'd be a bit surprised if that had happened, in any case, because it's clearly had a fair bit of transport in its time, and worked fine last June.
Thank you. I tried working the beam finder in and out a few times but it didn't help. The beam finder does something, makes the trace more blurred, but that's all.
Hello, I see that your unit does not have graticule, did you remove it, is it removable? I am interested in a similar model (1335A) and I want to know if the graticule could be removed, it is difficult to get information . thanks
I no longer have the 1332A but it never had a graticule while I owned it. I have a 1335A in storage which does have a graticule, but I don't know if it's removable. It's not at all clear from the service manual, sadly. Next time I get chance I'll try and check, but I don't know when I'm next going to my storage unit.
