The E1 mask is displayed in blue and all four channels are compared to the mask. The readout shows that Ch4 failed 26 waveforms out of the specified 1000 for the test. Mask failures are captured and highlighted in the mask region. In this case, the operator can easily tell that the signal on Ch4 failed the test because the highlighted waveforms appear in a bright green color, the same color as the Ch4 selection button on the TDS3000 front panel. Average controls the number of acquired waveforms to be averaged together during the test.
Polarity selects whether the positive pulse, negative pulse, or both are tested.
If both is selected, the instrument will test the positive pulse then automatically invert the signal and test the negative pulse. Wfm Lock locks the waveform and mask so that they can be positioned together on the screen. Wfm Lock is very useful when you want to use the front-panel ZOOM button to get a closer look at a mask failure. This menu provides access to all the functions of the TDS3TMT application module. Editing the Mask Often in manufacturing, you need to use a mask that is either a variation of a standard or is a manufacturer's proprietary mask.