Okay, I have an (ancient) Tectronix 2335 100 MHz Oscilloscope. I'm trying to make it display something similar to this with two signals:

 

I'm not sure I really understand your question, but I think all the settings you need for your older Tek scope are shown on the menus at the right side of the picture.

Trigger: falling ( negative slope )
Source: External, ( channel A )
Auto triggering
DC Coupling
5 volts per division
25uS time base.

With a bit of trigger adjustment ( take the scope off of Auto trigger ) you should see the same thing, except the waveforms will likely start at the first falling edge of the upper waveform.

By the way, the scope I use most often is older than your 2335, it's a 2235, militarized version. Digital is great, but does have its limitations sometimes too.

 

Yes, thank you for your help. I also looked around elsewhere on this forum, and found out some good information. I guess the only question I have now is how to make the lines stop zipping across the screen. I've been able to slow them down, but I'd like to know if there's a setting to freeze frame or something like that.

 

Only if it's a storage scope, a conventional analogue scope can't do that.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

...and sinchronized - the chanel 1 pulse sinchronic with the channel 2 pulse above, given a frequency that the oscilloscope can handle, the image should be stable, I think.

Just in case, trigger should be through chanel 1 signal.

Am I right?

Agustín Tomás

 

About how much does a storage scope run for?

 

broken ones (some faults, but they still function) can run for upwards of 400.

__________________
Jeff
To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.

 

:shock: :shock: :shock: What about the cheap end of storage scopes?

 

There is no cheap end...I was lucky enough to find my storage scope in a junk room at work. they charged me a whopping $0.25 / lb. I paid $6.75 for it
and they also have a really sweet 4 channel LCD type scope sitting there. goes for about $3,000 on ebay. but they are keeping it for parts

__________________
Jeff
To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.

 

They don't have a 'cheap' end.

There are basically two types:

1) Analogue storage scopes - old scopes, these use a special tube, able to store the image on the screen - VERY expensive!.

2) Digital storage scopes - anything remotely modern, these digitise the signal and store it in digital memory, it's then played back on some kind of display - usually either CRT or LCD.

You can get 'cheap' PC scopes, which use a PC as the display device, but they still aren't very cheap!, and performance isn't great.

What exactly are you trying to read?, you can download free scope software for PC's that uses the sound card as the input device, giving a 'free' low spec storage scope.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

I'm using it for timing on SNES controllers and PIC I/O lines.

 

Assuming it's only low audio frequencies?, the sound card scopes would probably be good enough!.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

But will it be able to freeze frames? I havn't seen that setting on any of them yet.

 

Depending on how fast you want as a sampling rate. Go with a USB oscilloscope for around $150US ish. Check out HVWTECH.com or HWVTECH.com.....hmmm one of them anyways.

 

I've never played with one, but I would expect them all to?, it's a very trivial facility with the way they work.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk