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Figure 6-37.Displaying CHOP mode
ACCESSORIES - 14188_213

Neets Module 16-Introduction to Test Equipment
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6-34 Figure 6-38.—Dual-channel display in CHOP mode. ADD.—The ADD switch (shown earlier in figure 6-34) algebraically adds the two signals of channels 1 and 2 together for display. Other Dual-Trace Oscilloscope Controls Most dual-trace oscilloscopes have both an A and B time base for horizontal sweep control. Notice in the upper right corner on our example scope (figure 6-34) the COUPLING, SOURCE LEVEL, and SLOPE controls. These serve the same function as did those same controls in the A time-base section of the scope. The B time base is selected using the same A and B TIME/DIV control (pull out outer knob). The use of the B time base is controlled by the HORIZ DISPLAY section discussed earlier in the A time-base section. However, inexperienced technicians generally do not use A and B time bases together in the MIXED, A INTEN (intensified), and B D'LYD (delayed) settings. These controls are fully explained in the applicable technical manuals; therefore, we will not discuss the controls in this chapter. Figure 6-39 is a block diagram of a basic dual-trace oscilloscope without the power supplies.






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