Tektronix TDS1000B Series Operator's Manual page 168

3
Using VERTICAL Controls
3. Push the appropriate side-screen menu button to select
Coupling AC.
The waveform shifts down because AC coupling blocks
the DC component of the signal. However, the ground
reference arrow and the trigger level reference arrow at
the left and right of the display, respectively, do not shift
from their initial positions.
4. In the VERTICAL section, turn the CH1 VOLTS/DIV
knob clockwise to set the CH1 vertical scale readout in
the bottom left corner of the oscilloscope display to be
CH1 50.0mV.
5. Turn the CH1 POSITION knob clockwise to set the
vertical position at 50.00 divs (2.50V). Fine-tune the
probe calibration for a square waveform.
Notice that the bottom of the magnified AC coupled
signal is now visible. This is possible with 50 vertical
divisions of position offset.
3-8 TDS1000B and TDS2000B Series Oscilloscopes – Operator Training Kit