need help to build my own smps based on blaupunkt schematics gta400 please

[Perry Babin]

Set the timebase to 2mS

Set the vertical amps to 0.5v/div.

Set the coupling to DC.

Set the vertical position of the trace in the center of the display.

Set the trigger mode to auto.

Set the trigger source to ch1.

Clip the probe on the calibration point.

Do you see a locked square wave?

 

[Ground Zero]

No i haven't a square wave

with your setup i have this ??

An externally hosted image should be here but it was not working when we last tested it.

 

[Ground Zero]

This is a better picture with your setup

An externally hosted image should be here but it was not working when we last tested it.

 

[Perry Babin]

That's a square wave. Set the time base a few clicks clockwise until you have about 3 full cycles on the display.

Adjust the focus to get as sharp a trace as possible.

 

[Ground Zero]

ok thanks perry

i have this is it ok ?

this is the picture:

An externally hosted image should be here but it was not working when we last tested it.

I surrounded two buttons, when i touch them the functions are the same is it normal ? they align the trace to horizontal...

Thanks

 

[Perry Babin]

The top one should move the trace from side to side. It's to align the trace to the markers if you're going to use the scope to make calculations.

The bottom one should make a difference in the vertical amplitude. Leave it in the 'cal' (fully clockwise) position.

 

[Ground Zero]

great thanks perry

i have a better picture of the scope from the owner

An externally hosted image should be here but it was not working when we last tested it.

the website
CQ620C/620CF/640C/640CF

can you tell me please if i do a good deal for the price or ......259.5 euros

i have also a button near horizontal position call swp/var may i need to set it to cal position or not ?

for the trigger i have a button name level can you tell me if i need to set it or not ?

how can i use it to mesure a dc voltage please ?

 

[Perry Babin]

Only you can determine if the deal was OK.

Set the swp/var to cal.

The level control will be used to make the scope trigger properly on the waveform.

You use a voltmeter for voltage. You can get a rough reading on the scope. Go to page 73 of my car audio site. It tells you how to measure the voltage on a scope.

 

[Ground Zero]

cool Perry

I will go on your website

thanks

so if i understand i must set all button on "cal position" for a standard measurements ?

 

[Perry Babin]

If you don't have the controls set to cal, you can't use the scope to measure time, frequency or voltage.

 

[Ground Zero]

ok thanks Perry

So i set buttons:

- the swp/var to "cal"
- the second buttons of volts/div for CH1/CH2 to "cal" "fully clockwise"

Now i've seen your website but you don't explain what button i can push or use to do the measurement

I do a test with an accu of 9V
i set the scope:
-Time/div to 1v/div
-volt/div to 1v/div
-trigger source to CH1
-Mode CH1
-button of CH1 to DC position.
-probe to x10

this is the measurements

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Is it a normal result ?

with my multimeter i have 8.4 volts and on the scope ???

 

[Perry Babin]

That's right. You have just under 10v (vertical amp set to 1v and probe set to 10x). That would require 10v to deflect one major division.

 

[Ground Zero]

Ok so if i understand a division is a graduation mark "like a school rule" and not a square ?

if you can confirm me that please

for all measurements i only need the CH1X or i must set the time/base to XY and use CH2 to measure DC voltage ?

I try to measure the DC voltage of an 13.8 smps supply on CH1x and i have this result ????

An externally hosted image should be here but it was not working when we last tested it.

I set time/div to 1
volts/div to 1
and dc voltage

for me the result is 7 volts not 13.8volts or 70volts because the prob is set to 10x

It's confused

Can you explain me please ?

Sorry for all theses stupid questions from a newbie

 

[Perry Babin]

With the scope set to 1v/div (major division) and the probe set to 10x, it takes 10v to deflect the trace 1 major division. You have approximately 1.5 major divisions of deflection so you have approximately 15v. Again, the scope is not for critical voltage measurements.

 

[Ground Zero]

ok thanks Perry

Now i begin the pcb of my smps car audio it's hard for me but I am persevering

 

[Perry Babin]

You should power up the power supply you have to see what the waveforms and voltages are at various points.

 

[Ground Zero]

Hello

Ok Thanks Perry for your help

for the moment i try to build my PCB the final circuit will have theses dimensions 10cm X 15cm because i only have this type pcb board

 

[Ground Zero]

Hello

I've got news about my pcb supply based on blaupunkt schematics

Here is a draft not completed

An externally hosted image should be here but it was not working when we last tested it.

It's verry difficult for me "it's my first pcb supply"

The IC is difficult to draw

 

[Ground Zero]

I modify it

An externally hosted image should be here but it was not working when we last tested it.

I haven't finish it it's very hard

 

[Ground Zero]

Yes !!! I finish this smps

An externally hosted image should be here but it was not working when we last tested it.

for my first smps do you think it's good ?

this is a view with all components but ref are missing

An externally hosted image should be here but it was not working when we last tested it.

Thanks in advance for any comments