19Chapter 2. Getting Started the BHT-6000 and System Mode■ Checking the Battery Voltage LevelPressing the ENT key while holding down the SF key displays the current voltagelevel of the batteries or battery cartridge as a bar indicator on the LCD. (Releasingthose keys will erase the indication.)For details, refer to Subsection 2.4.3, "Adjusting the LCD Contrast & Beeper Volume,and Displaying the Battery Voltage Level."■ Low Battery IndicationIf the battery voltage level drops below the specified level while the BHT-6000 is inoperation, the BHT-6000 displays the following message on the LCD, beeps five times,and turns itself off automatically.• When driven by dry batteriesIf either of the above messages appears, immediately turn the power off and thenreplace the batteries.• Before battery replacement, be sure to turn the power off. Within three minutesfrom the removal of batteries, you should load new batteries to avoid data loss.After replacement, turn the power on and check the operation.• Be sure to put in two new alkaline manganese batteries (LR03).• If the BHT-6000 is not to be used for one month or more, remove the batteries.Upload the data stored in the BHT-6000 memory to the host computer ifnecessary; otherwise, the stored data will be lost.NOTEReplace thebatteries!