Today, we injected various audio signals to evaluate the beating technique. The loudspeakers were placed on the DET terrace and positioned as far apart as the cable length permitted.
Test Schedule:
08:15:00 + 1200s → 49 Hz and 51 Hz
09:24:00 + 600s → 54 Hz and 54.01 Hz
09:39:00 + 300s → 54.01 Hz and broadband noise
During the tests, significant background noise was present due to crane operations in the CEB hall.
This morning, following the last failed acoustic injections #67509 (despite the loudspeaker being left powered), a few tests were carried out to investigate and fix the problem with the smart PDU (Loudspeaker_PDU).
Test 1: All acoustic injections via METRATON → failed
Test 2: Only NEB and WEB acoustic injections via METRATON → successful
Test 3: Only CEB acoustic injection via METRATON → failed
Test 4: Only CEB acoustic injection via AcousticInjectionCEB VPM process→ failed
Test 5: Only CEB acoustic injection via ENVnoise VPM process → successful
From Figure 1, the problem seems to be related to a loss of communication with the PDU. As a temporary workaround to enable acoustic injections, the code lines handling the switch-on/off were commented out:
After this modification, both CEB-only acoustic and all acoustic injections via METRATON were successfully tested, Figure 2.
The issue should ultimately be fixed by addressing the malfunction of the smart PDU.
