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separately in the carrying case, one of which should be installed in the <br /> personalDataRAM when preparing it for operation. <br /> NOTE:Whenever the personalDataRAM is to be left unused for an extended time <br /> (i.e.longer than a month), the 9V battery should be removed from the unit. <br /> Removing the battery will lose neither the program, time/date keeping,nor stored <br /> data. <br /> To install the battery proceed as follows: <br /> • Hold the personalDataRAM upside down. <br /> • Loosen thumbscrew that secures the battery compartment cover (see Figure 3 or <br /> 4), and remove that cover. <br /> • Observe battery polarity and the back panel battery orientation pattern (the <br /> negative battery terminal is the one closer to the side of the instrument). <br /> • Insert the battery by sliding it in until it bottoms out. It should protrude slightly <br /> above the bottom surface of the instrument. <br /> • Place battery compartment cover over battery and,while pushing down the <br /> cover firmly (taking care that the cover seats flush on the bottom surface of the <br /> personalDataRAM), tighten thumbscrew securely. <br /> 6.2 Battery Replacement <br /> Normally, only alkaline type 9V batteries (type 1604A,or equivalent) should be <br /> used with the personalDataRAM. <br /> Only fresh batteries should be used in order to ensure the maximum operating time. <br /> The personalDataRAM shuts itself off whenever the battery voltage falls below 6 <br /> volts (while retaining all programming and data). A fresh 9V alkaline battery, at <br /> room temperature, should provide typically 20 hours of continuous operation <br /> (please note that not all manufacturers produce batteries of equal capacity). <br /> Intermittent operation should extend the total running time because of partial <br /> battery recovery effects. <br /> The approximate remaining battery capacity is indicated by the personalDataRAM <br /> (see Section 8.2) in increments of 1%,starting from 99%. If the remaining battery <br /> capacity is 40% or less, immediate restarting after shut off is automatically inhibited <br /> to prevent incomplete runs. If,nevertheless,a new run is to be initiated with low <br /> remaining battery capacity, do not shut off the personalDataRAM at the end of the <br /> previous run (i.e.,remain in the Ready Mode, see section 7.0). <br /> When significantly extended operating times are required (beyond the typical 20 <br /> hours),the use of either lithium or zinc-air batteries can be considered. The use of <br /> such alternative battery types can provide about 2 to 3 times longer operation than <br /> alkaline batteries. <br /> 12 <br />