AEMC 4500 User Manual

Also see for 4500: User manual

Contents

If the colon (“11” in Figure 3) lights up, the battery has lost power.Thereafter, the available operating time remaining is approximately 10015-second measurements.When this situation arises, recharge the battery at once or obtain powerfrom an external battery (see subsequent paragraphs).Recharging Built-In Battery• Use the power cord stored inside the compartment within the cover.• Plug the power cord into the female input jack identified as “13” inFig. 3, p. 5.• Connect the other end of the cord to a power outlet (voltage must bethe same as voltage indicated on the plate identified as "14").• The red light (“10”) will turn on and remain lit while the battery isrecharging. Charging time is 14 hours minimum for a discharged bat-tery.Note 1: The battery may be charged for more than 14 hours withoutdamaging the instrument (internal protection).Note 2: Do not allow the battery to remain discharged for more than sev-eral days (the colon “:” will remain lit; see “11” in Figure 3, p. 5).)If an instrument is not used frequently, the battery should be rechargedregularly, three-month intervals are recommended.Power Supply from External BatteryThe external battery should be directly connected to the appropriate ter-minals (“8” in Figure 3). Be sure to observe the proper polarities. Theexternal battery does not charge the internal battery. Note that it is notnecessary to remove the battery supplied with the instrument whenusing an external battery or supply.12 Digital Ground Resistance Tester Model 4500