Yesterday we injected shaped noise, withe noise + a low pass filter (8th order butterworth filter with a cut-off frequency @ 100~Hz amplitude @ 1mHz of 0.18), on the Laser Amplifier to measure the Power noise.

The measurement is shown in figure 1.

Before doing this measurement we tested the generation of the noise, injecting a simple line, with dataDisplay and an oscilloscope, figure 2 and 3.

As it is visible in figure 3 the signal generated by the DAC has a strange behavior every periods, red circle, which has to be checked. We tested several line frequencies (5 10 13 50 100 110 115 Hz) and the behavior was identical.

A zoom in time of the nasty region is shown in figure 4.