Oscilloscope basic question

[nhouza]

hi guys, very first  post for me and great to be here. getting into electronics more and more with the time.
i purchased a second hand very cheap Grundig Oscilloscope Mo 32-30Mhz in order to get more understanding and learn. i found it for 50bucks and got it straight away.
i can't find infos about  the time B section which is ms/cm with delay knob on the side.
of course the manual wasn't with the oscilloscope and i can't find it on the internet.
ghere a picture of the oscilloscope
https://ibb.co/2dZY9yk

can you help me out? any info or link where i can understand about it? cheers

[Deepak]

I think that controls how quickly the trace redraws on the screen.

[Benta]

No magic about it. You have a scope with two timebases for the horizontal sweep. "A" is an addition to normal scopes (to my mind unnecessary, but there might be a reason), "B" is the standard type of timebase.
The "delay" knob does exactly what it says, it delays the sweep after triggering. This is useful when you have an event (eg, a pulse), but want to examine in detail what happens later.

[thedoc298]

Did a google search of "Grundig Oscilloscope Mo 32-30 Mhz manual" and it brought up plenty of manuals.


That is a nice scope with duel timebases a very nice feature. That will let you look at two different traces of different frequency, have fun playing. Lot of fun for 50 bucks

[Gae]

Hi.

I don't want to open a new topic but what about Grundig scopes ? Are they "good" ones ?
I can buy one for 35€, a GO 20 working but can't find any information on the net.
Is it worth to buy ?
A have a digital one but need/want an analogue one too.
I'v also seen some Tektronix 453a at about 150€, would there be a big difference ?

Or a Hantek HM408 at 100€..

Or a Beckmann 9020 ?

Thanks if there is any advise.

[CaptDon]

Good God there are some really wrong answers posted here for you!!!!
It doesn't control retrace time, nor trigger hold-off!!!!
It doesn't have a 'useless' A timebase either, nor is it really
two sweeps for two different frequencies!! NORMALLY you set
up the A-Trace for a stable display of a complete waveform.
Lets say for example you select 1ms per division. Now, you want
to examine a specific part of that stable waveform. You would set
the B-Trace or more correctly B-Sweep to a faster speed, perhaps
.1ms per division. A scope that shows A intensified by B will now
show a smaller portion of the trace slightly 'intensified' so you know
when the B-Sweep is active. The DELAY knob will move this bright
portion left or right and you adjust it to the specific part of the A-Sweep
you want to examine in detail. Then you switch to the B-Sweep and you
will usually see ONLY the intensified portion extending across the entire
screen. Some scopes will show both the A-Sweep and B-Sweep one
below or above the other. Makes me crazy when people post mis-leading
information and foul another mate up.

[basinstreetdesign]

Good God there are some really wrong answers posted here for you!!!!
It doesn't control retrace time, nor trigger hold-off!!!!
It doesn't have a 'useless' A timebase either, nor is it really
two sweeps for two different frequencies!! NORMALLY you set
up the A-Trace for a stable display of a complete waveform.
Lets say for example you select 1ms per division. Now, you want
to examine a specific part of that stable waveform. You would set
the B-Trace or more correctly B-Sweep to a faster speed, perhaps
.1ms per division. A scope that shows A intensified by B will now
show a smaller portion of the trace slightly 'intensified' so you know
when the B-Sweep is active. The DELAY knob will move this bright
portion left or right and you adjust it to the specific part of the A-Sweep
you want to examine in detail. Then you switch to the B-Sweep and you
will usually see ONLY the intensified portion extending across the entire
screen. Some scopes will show both the A-Sweep and B-Sweep one
below or above the other. Makes me crazy when people post mis-leading
information and foul another mate up.

Yes, What he said.

[Electro Fan]

You can think of this overall topic as being analogous to “zooming in” to see more detail of a signal while also being able to see the zoomed out view.  This helps you see the detail in the zoomed in version while retaining a reference to where the detail resides in the zoomed out view.

This technique for navigating both the detailed and larger signal views at the same time was popularized on analog oscilloscopes.  Today on digital oscilloscopes it is handled in a different manner (both externally by the user and internally by the scope) but with a similar result and is generally referred to simply as “zoom”.

The following videos will reinforce what basinstreetdesign has described by helping you visualize A, B, delayed timebase, etc, with examples of how and why they are used.  (Each manufacturer and model may differ somewhat in control layout but the concepts will be pretty similar if the features and functions are present on the scope.)

https://youtu.be/J-7MycqHPOs

https://youtu.be/54roz8IUoVI

W2AEW is a major resource for anyone learning to use oscilloscopes and other test equipment, and he is a wonderful teacher of many aspects of electricity and electronics.  He has a ton of highly valuable videos, check them out.