Adjusting offset

Edukits EDU08
1

I have Some trouble to adjust the offset.
When i connect The red wire on THE test pin The lowest value is 1 volt and not 0.00

When I measure R1 and R2 both are 10ohm and not 2,2

2

What is the value displayed on the screen after this procedure:

  • Connect the test leads together.
  • Press the Menu button.
  • Use the down arrow button to scroll down to “Measure”.
  • Use the right arrow button to select “Vdc”.
  • Press the Menu button to return to the oscilloscope display.
  • Now adjust the Offset trimmer RV2 until the displayed value is 0.00V.
3

After this procedure is the value on the test pin:
1.44v, not contious (between 1,38v and 2.13v)

4

Very strange result.

What value is displayed in the last step of this procedure:

  • Connect the test leads together.
  • Press the Menu button.
  • Use the down arrow button to scroll down to “Measure”.
  • Use the right arrow button to select “Vdc”.
  • Press the Menu button to return to the oscilloscope display.
  • Now adjust the Offset trimmer RV2 until the displayed value is 0.00V.

Can you adjust the offset trimmer until the value displayed is 0.00V ?

Is the trace stable and in the middle of the screen?

[quote]When I measure R1 and R2 both are 10ohm and not 2,2[/quote]What is the color code on these resistors?

5

The resistors color red red gold Braun white

First thing straight:
Are there more ways to calibrate?

  • test leads together 0v
  • 9v battery (8.6v) -> 8.59v
  • TEST pin 1.31v
6

[quote]- test leads together 0v

  • 9v battery (8.6v) -> 8.59v
  • TEST pin 1.31[/quote]
    These results are OK.

It seems that your EDU08 is properly calibrated.

7

[quote=“VEL255”][quote]- test leads together 0v

  • 9v battery (8.6v) -> 8.59v
  • TEST pin 1.31[/quote]
    These results are OK.

It seems that your EDU08 is properly calibrated.[/quote]

Thats means the manual is wrong?
The test pin Will be 0v

8

[quote]Thats means the manual is wrong?[/quote]Can you please elaborate on the issue.

This is what you should see on the screen when the red lead is connected to the test pin:

edu08_10.jpg787×443

9

My excuses I got it wrong.
I have mix 2 things.

Thanks for our time
This case can be closed.

10

OK - No problem.
Enjoy your EDU08 :slight_smile: