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6.3 AC Power Supply <br /> A universal line voltage AC to DC power supply (MIE model pDR-AC)is provided <br /> as standard accessory with the personalDataRAM.This power supply can be used <br /> with any line with a voltage between 100 and 240 VAC (50 to 60 Hz).When using <br /> that power supply,its output plug should be inserted into the external DC <br /> receptacle at the base of the personalDataRAM (see Figure 3 or 4). Insertion of that <br /> connector automatically disables the internal 9V battery of the instrument. Removal <br /> of the pDR-AC plug from the instrument automatically re-connects the internal 9V <br /> battery. <br /> NOTE: Before plugging in or unplugging the external power supply,the <br /> personalDataRAM must be shut off. <br /> 6.4 Rechargeable Battery Module <br /> A rechargeable battery pack (MIE model pDR-BP) is available as an optional <br /> accessory. This unit attaches directly to the base of the personalDataRAM. <br /> The pDR-BP contains a sealed nickel-metal-hydride battery,which provides <br /> typically 72 hours of continuous operation between successive charges (for 3-hour <br /> charging). <br /> The use of the personalDataRAM,in combination with the pDR-BP connected to the <br /> a.c. power line ensures totally uninterruptible operation over indefinitely long <br /> time. In this operating mode, line power interruptions lasting up to 72 hours have <br /> no effect on measurement run continuity. <br /> To attach the pDR-BP to the personalDataRAM, the instrument should be shut off. <br /> Carefully plug the pDR-BP into the external DC RECEPTACLE on the <br /> personalDataRAM. Rotate the large thumbscrew at the opposite end of the pDR-BP <br /> tightening it firmly. The pDR-BP can be recharged by means of the AC power supply <br /> of the personalDataRAM. <br /> Detailed instructions for the use of the rechargeable battery module are furnished <br /> with that accessory. <br /> 6.5 Zeroing the personalDataRAM <br /> One of the most important steps to be performed by the user before initiating a <br /> measurement run with the personalDataRAM is to zero the instrument. This is <br /> required to ensure maximum accuracy of concentration measurements, especially at <br /> low levels, i.e. below about 0.1 mg/m3. <br /> During the 2-minute pre-run automatic zeroing sequence (see Section 8.1), the <br /> personalDataRAM registers its own optical background,stores that level in its <br /> 13 <br />