need help to build my own smps based on blaupunkt schematics gta400 please - Page 3 - diyAudio
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Old 8th December 2010, 01:02 PM   #21
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Location: Louisiana
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?
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Old 8th December 2010, 01:11 PM   #22
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No i haven't a square wave

with your setup i have this ??

Click the image to open in full size.
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Old 8th December 2010, 01:14 PM   #23
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This is a better picture with your setup

Click the image to open in full size.
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Old 8th December 2010, 01:14 PM   #24
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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.
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Old 8th December 2010, 01:29 PM   #25
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ok thanks perry

i have this is it ok ?

this is the picture:

Click the image to open in full size.


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

Thanks
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Old 8th December 2010, 01:42 PM   #26
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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.
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Old 8th December 2010, 01:48 PM   #27
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great thanks perry

i have a better picture of the scope from the owner

Click the image to open in full size.

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 ?
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Old 8th December 2010, 01:59 PM   #28
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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.
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Old 8th December 2010, 02:02 PM   #29
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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 ?
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Old 8th December 2010, 02:07 PM   #30
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If you don't have the controls set to cal, you can't use the scope to measure time, frequency or voltage.
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