Oscilloscope basic question - Page 1
Forum section: electronics / beginners

author: nhouza
author_rank: Newbie
timestamp: March 16, 2019, 07:46:45 pm
content: 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 oscilloscopehttps://ibb.co/2dZY9ykcan you help me out? any info or link where i can understand about it? cheers

author: Deepak
author_rank: Regular Contributor
timestamp: March 16, 2019, 08:56:47 pm
content: I think that controls how quickly the trace redraws on the screen.

author: Benta
author_rank: Super Contributor
timestamp: March 16, 2019, 09:24:53 pm
content: 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.

author: thedoc298
author_rank: Contributor
timestamp: March 17, 2019, 11:35:10 am
content: 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

author: Gae
author_rank: Contributor
timestamp: December 21, 2020, 05:54:49 pm
content: 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.

author: CaptDon
author_rank: Super Contributor
timestamp: December 21, 2020, 06:24:29 pm
content: 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 reallytwo sweeps for two different frequencies!! NORMALLY you setup the A-Trace for a stable display of a complete waveform.Lets say for example you select 1ms per division. Now, you wantto examine a specific part of that stable waveform. You would setthe B-Trace or more correctly B-Sweep to a faster speed, perhaps.1ms per division. A scope that shows A intensified by B will nowshow a smaller portion of the trace slightly 'intensified' so you knowwhen the B-Sweep is active. The DELAY knob will move this brightportion left or right and you adjust it to the specific part of the A-Sweepyou want to examine in detail. Then you switch to the B-Sweep and youwill usually see ONLY the intensified portion extending across the entirescreen. Some scopes will show both the A-Sweep and B-Sweep onebelow or above the other. Makes me crazy when people post mis-leadinginformation and foul another mate up.

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: December 22, 2020, 08:22:55 am
content: Quote from: CaptDon on December 21, 2020, 06:24:29 pmYes, What he said.

author: Electro Fan
author_rank: Super Contributor
timestamp: December 22, 2020, 10:26:06 am
content: 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-7MycqHPOshttps://youtu.be/54roz8IUoVIW2AEW 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.