Figure F18. Results of the system power consumption measurement for the Hole 1151B system. The power supply voltage for the system was 35.4 V. The system was left automatically booting until all the sensors were powered. After the successful start of the whole system, power was shut off temporarily for the PMD seismometer, the tiltmeter, and the corresponding DM24 to evaluate the contribution of the PMD seismometer/tiltmeter components in the consumption. Approximately 4 hr after the system power-up, the system power consumption decreased more than 2 W because of the completion of the charging of NiMH batteries in the storage acquisition module (SAM). OBHS = ocean borehole seismometer; CRM = combiner/repeater module; SIM = strainmeter interface module.