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8.0 OPERATION <br /> 8.1 Start-Up <br /> KEY DISPLAY NOTES <br /> 1. ON/OFF START ZERO:ENTER Before starting a run with the <br /> GO TO RUN:NEXT personalDataRAM,zero it(see <br /> Section 6.5)and key ENTER while <br /> the unit is exposed to particle-free <br /> air. Alternatively,key NEXT to go to <br /> RUN/READY mode.If ENTER is <br /> keyed: <br /> 2. ENTER ZEROING V2.00 Keep clean air flowing while <br /> ZEROING is displayed*for 1.1 min., <br /> followed by one of these screens: <br /> CALIBRATION: OK or, <br /> BACKGROUND HIGH or, <br /> MALFUNCTION If CALIBRATION: OK,then go to <br /> step 3. If one of the other two screens <br /> is displayed,consult Section 12.0. <br /> 3. NEXT START RUN: ENTER To start a measurement run <br /> READY:NEXT key ENTER(Section 8.3,step 1).To <br /> set up for a run and scroll logging/ <br /> operating parameters,key <br /> NEXT (see Section 8.2). <br /> 4. ON/OFF TURN OFF PDR? Keying ON/OFF while the unit <br /> Y:ENTER N:NEXT is operating will elicit this message to <br /> prevent accidental shut off. <br /> To confirm shut down,key <br /> ENTER. To continue operation, <br /> key NEXT. <br /> *The number following the V on the screen refers to the installed firmware version. <br /> 18 <br />