EW channel test. As shown at the bottom of the Oscilloscope screen, the Channel 1 vertical axis (sensitivity) is 50 mV per cm (large division) and the Channel 2 sensitivity is 2 V per cm; horizontal axis (sweep) is 2.5 microseconds (us) per cm. The Test Signal Source auxiliary loop, dB/dt, is used as EW input, Channel 1; high side of the loop is connected to E, and the low side to W, with each side terminated with 75 ohms to ground. Channel 2 shows the EW output into a 100-ohm load. Test Source is set for High, Normal, Biphasic output. The NS channel will show identical performance.