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DUAL-TRACE OPERATION
Figure 6-36.CHOP mode

Neets Module 16-Introduction to Test Equipment
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6-31 Figure 6-34.—Components to select vertical operating mode. CH 1 AND CH 2.—These controls allow you to display signals applied to either channel 1 or channel 2, as discussed earlier. TRIGGER VIEW.—The TRIG VIEW allows you to display the signal that is actually used to trigger the display. (Triggering was discussed earlier.) ALT.—The ALT (alternate) mode (figure 6-35) of obtaining a dual trace uses the techniques of GATING between sweeps. This control allows the signal applied to channel 1 to be displayed in its entirety; then, channel 2 is displayed in its entirety. This method of display is continued alternately between the two channels. At slow speeds, one trace begins to fade while the other channel is being gated. Consequently, the ALT mode is not used for slow sweep speeds. The CHOP mode, shown in figure 6-36 (explained next), will not produce a satisfactory dual sweep at high speeds. The ALT mode is deficient at low speeds. Therefore, both are used on dual-trace oscilloscopes to complement each other and give the scope a more dynamic range of operation.






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