Vertical Axis
The amount of vertical trace deflection on the LCD display is controlled by the voltage dropped across the internal impedance Rs of the Tracker. Because Rs is in series with the load RL, this voltage will be proportional to the current flowing through RL. This current that flows through the component under test is the vertical part of the signature.
When the RL is zero ohms (0Ω) by shorting the output terminal to the common terminal, there is no voltage dropped across RL causing no horizontal component displayed in the Tracker signature. This short circuit signature is a vertical line trace on the LCD display.
Connect the red microprobe to the output channel A jack on the Tracker 2800 and the black microprobe to the Common jack. Touch and hold the probes together and observe the Tracker signature on the LCD display.
You will see a vertical line trace in the middle of the LCD display.