PERFORMANCE TEST
4 - 7
4.3.4
Orthogonality
This test checks the angle between the horizontal and vertical deflection plates
(orthogonality).
Test equipment:
Fluke 5500A mode wavegen, wave sine (Alternative: function generator PM5136).
Test set up:
Settings/procedure:
1
-
Press the CAL key for a few seconds to start the autocal procedure. This
takes approximately 4 minutes. When ready, the oscilloscope is fine tuned
to optimal accuracy.
2
-
Apply a 50 Hz sine wave signal of 8V (pp) to input CH1;
3
-
Press the AUTOSET key and adjust the input signal to a trace- height of
8 div (CH1 in 1V/div).
4
-
Activate the GND function and verify that the straight line is exactly parallel
to the horizontal graticule lines. If not, readjust the TRACE ROTATION.
5
-
Switch the GND function off and verify that a signal of 8 divisions is
displayed.
6
-
Press the DISPLAY menu key.
7
-
Press the X-DEFL softkey.
8
-
Select ’on’ and ’ch2’ from the X-DEFL menu.
9
-
Use the X POS control to move the vertical line to the center of the screen.