Tektronix 2247A

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Basic Applications
h. Select ADD, and then turn on CH 2 INVERT (unless cancellation
signal is already 180° out of phase). Turn off the CH 1 and CH 2
displays and slightly readjust the CH 2 VOLTS/DIV VAR control for
maximum cancellation of the line-frequency component (see Figure
5-9B).
|. The SEC/DIV setting may be set to a faster sweep speed to expand
the waveform, and the display amplitude may be Increased by
advancing both VOLTS/DIV switches and readjusting the VOLTS/
DIV VAR controls as necessary to maintain cancellation of the
undesired signal component.
2247A Operators 5-25