HOW TO USE THE INSTRUMENT 4 - 15
VERTICAL POSITION
Use the POS control to adjust the ground level to any desired vertical
position on the screen.
- Use the position control to position the line in the middle of the screen.
Observe that the channel identifier ’1-’ shifts with the trace.
- Press the AC DC GND key again to obtain ac input coupling.
Since the Probe Adjust signal is a pulse type signal with a 50% duty cycle, its
mean value is at the 50% amplitude level of the input signal. When the input is ac
coupled, the mean value will be displayed at the ground level of the oscilloscope.
As a result of this, the displayed waveform is centered on the screen.
ST6158
9303
POS
MAT4171
1
POS
1