In view of the implementation of the acoustic injection in the METRATON node, we prepared the setup. The loudspeaker was installed in the DET Lab (in the corner, behind the door) and powered by a standard UPS socket, see Figure 1. The DAC channel used for the noise injection is located under the EDB, see Figure 2, 3 . Details are given below:

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DAQ box: DBOX_SN51, DAC1955_SN46
Channel used:  7
Channel of ENV noise matrix: NOISE_CEB_DetLab_speaker_1

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We performed two colored noise injections via ENVnoise process. The first one showed a “strange” behavior, reminiscent of the old-type injection with a spike at the beginning. It is not clear why the first injection did not work properly while the second one did, despite no changes being applied to the setup, see Figure 4. 

Next steps:

• upgrade the METRATON code for the DET Lab acoustic injection;

• define the value to be sent to the DAC;

• power the loudspeaker through a smart PDU.