Reference
Selecting Channels
The

selected channel

is the channel that the digitizing oscilloscope applies all
waveform-specific activities to (such as measurements or vertical scale and
position).
The channel readout shows the selected channel in inverse video in the lower
left corner of the display. The channel reference indicator for the selected
channel appears along the left side of the display. See Figure 3-71.
Channel Readout
Channel Reference
Indicator
Figure 3-71: The Channel Readout
Selecting channels on the TDS 600A series oscilloscopes is straightforward
and easy.
The

channel selection

buttons are on the right of the display and are labeled
CH 1, CH 2, CH 3 (AUX 1 on the TDS 620A & TDS 524A), CH 4 (AUX 2 on
the TDS 620A & TDS 524A), and MORE. They determine which channel is
selected. The MORE button allows you to select internally stored

Math

and

Ref

waveforms for display and manipulation.
The selected channel is indicated by the lighted LED above each button.

Channel Readout

and Reference

Indicator

Channel Selection

Buttons