Using the data of the temporary installation for the RAM noise measurement on 8MHz and 56MHz, we can see that the coherence between these signals (ENV_RAM_8MHz_moni) and the ones available reading the EOM output monitor (DAQ_EOM_8MHz_raw_mag) is near zero.

This confirms that the ADC that monitors the EOM outputs probably has its own noise and is unable to read the real RAM. This result was seen also before, while measuring the 56MHz RAM coupling with DARM.

(someone could argue that we don't know who is right and who is not, the proof is that ENV_RAM_56MHz show a coeherence with LSC_DARM while DAQ_EOM_56MHz_raw_mag does not)

Valid data are:

• for the 8MHz   August 22 at 11:55 UTC + 1200S
• for the 56MHz August 22 at 12:50 UTC + 1500S

This stretch of data is AFTER the VGA gain setting to LowGain (August 22), while the test of the 56MHz coupling with DARM has been done in HighGain (July 31)

Attached: FFTs and Coherence of 8MHz and 56MHz