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Old 23rd Feb 2020, 6:21 pm   #21
szczepan_def
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Default Re: Polyskop swob 3 Rohde & Schwarz

Without this cap c116 I have 800ohm between pin 1-3, now a week brake for work, to next time
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Old 23rd Feb 2020, 6:25 pm   #22
6AL5W-Martin
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Default Re: Polyskop swob 3 Rohde & Schwarz

don`t forget the screw at the thermal clamp to warm up the input plug
your C116 can be any, 10µF or more, 22, 47, all will do there.
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Old 23rd Feb 2020, 9:36 pm   #23
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Default Re: Polyskop swob 3 Rohde & Schwarz

Congratulation, gentlemen!

Good job, Adam, and excellent advice, Martin!

@ Martin: I like your collection of old scopes! The 575 is a very special item, today it seems to be impossible to find one in fair or restorable condition.

Regards, Joe
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Old 25th Feb 2020, 7:03 pm   #24
6AL5W-Martin
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Default Re: Polyskop swob 3 Rohde & Schwarz

thank you.
It may be a good idea to ask in my community for a 575.
Sometimes they give away when upgrading to 576 or higher.
special tip: "mod 122c" is the 400 Volts Option, the normal 575 is up to 200V and can be lower expensive.
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Old 1st Mar 2020, 2:13 pm   #25
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Default Re: Polyskop swob 3 Rohde & Schwarz

I changed c116 , fuse is ok, on the monitor is only one big and four smal points
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Old 1st Mar 2020, 2:22 pm   #26
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Default Re: Polyskop swob 3 Rohde & Schwarz

I have another job with a sweeper... when checking the fuses one of them fell apart and some parts got stuck inside
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Old 1st Mar 2020, 2:23 pm   #27
6AL5W-Martin
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Default Re: Polyskop swob 3 Rohde & Schwarz

"indicated beam direction" is actually set to manually. Turn it to " ---->"

set SWEEP TIME to 1

fuses must be tested OK.

test again please.

You have 3 Plugins there.
Each of them have a own ILLUM pot for each channel it can work. Your SWOB is a 4 channels unit.

The LIN/Log use 2 channels.
The DC EMK IN use 1 Channel.
The second plugin is for displaying 5 horizontal help lines, each of them have own POS, and there is a common ILLUM at the plugin.

When getting the broken junk from the fuse turn OFF the SWOB ! there is 130 Volts. Get it with a isolated screw driver.
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Last edited by 6AL5W-Martin; 1st Mar 2020 at 2:42 pm.
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Old 1st Mar 2020, 2:55 pm   #28
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Default Re: Polyskop swob 3 Rohde & Schwarz

It seems to me that something is still damaged, when I set it "---->, the backlight bulbs dim as if there was a short circuit somewhere, test time only 2-3 seconds, I don't have more 4A fuses
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Old 1st Mar 2020, 2:56 pm   #29
6AL5W-Martin
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Default Re: Polyskop swob 3 Rohde & Schwarz

https://www.wellenkino.de/swob/swob-1.mp4 (MP4 video, 5MB 22sec)

it may be OK that the backlight dims a little, the deflection is magnetic and sucks 2 to 3A

I want to know that the beam is moving from left to right now, follow the little film.
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Last edited by 6AL5W-Martin; 1st Mar 2020 at 3:07 pm.
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Old 1st Mar 2020, 3:05 pm   #30
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Default Re: Polyskop swob 3 Rohde & Schwarz

thank you, I will check it again
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Old 1st Mar 2020, 3:18 pm   #31
6AL5W-Martin
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Default Re: Polyskop swob 3 Rohde & Schwarz

the little theory of dimming illumination in a SWOB III.

That apparatus use a CRT what is strong related to a TV-Screen tube, means the deflection is made electromagnetic. That requires some high current, and high current can dimm the illum so much that you will see this.

When the dots are full left or full right pos. the current is high,
when the dots are near center, the current is low.
SWOB use some 2N3055 to do that.. it`s hungry.
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Old 1st Mar 2020, 4:43 pm   #32
szczepan_def
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Default Re: Polyskop swob 3 Rohde & Schwarz

I made the test only with horizontal lines amp,
https://drive.google.com/file/d/1P6x...w?usp=drivesdk

when I set ---> my lighting is dim and my white point is lost, in test sweeper is not connected.
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Old 1st Mar 2020, 6:21 pm   #33
6AL5W-Martin
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Default Re: Polyskop swob 3 Rohde & Schwarz

When it is set to manually and you see the 3 dots there,
can you move them left and right with the <---> pot?
I think you must learn how that works first.


btw. I will not open cloudfiles without access, find a better way.
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Old 1st Mar 2020, 7:38 pm   #34
szczepan_def
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Default Re: Polyskop swob 3 Rohde & Schwarz

Yes, i can move point left-right The <----> pot. I didn't record this moment.
My test is in YT
https://youtu.be/FMKM89I-c40
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Old 2nd Mar 2020, 6:59 pm   #35
6AL5W-Martin
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Default Re: Polyskop swob 3 Rohde & Schwarz

have seen, thank you.

I think you have repaired the SWOB and it is now working.
Remember, this is important:

Each vertical plugin, Linlog and aby other also, have own pot for INTENSITY.
repeat the test following my little film and check the INTENS pot at the LinLog or the DC IN Plugin. When that is low adjusted you will not find a point or line anywhere.

For examples. Single channel DC IN Plugin,

That have a pot for INTENS and a Pot for the vertical position. Learn what they do.
SWOB have a lot of knobs, yes, but it is a system and easy to understand. Almost ever you have a INTENS, a VERTICAL POSITION and a SENSITIVITY for the signal input.
The must be adjusted for the test:

INTENS: enough that you see the dot.
VERT. POSITION: The dot must be on the screen, not upside or downside away.
please test

the SWOB is a system what can display up to 4 channels on the screen. So you must not remove plugins what are not in use, make them dark in the intens and use another.
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Last edited by 6AL5W-Martin; 2nd Mar 2020 at 7:04 pm.
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