Hameg HM304 Manual

Hameg HM304 Manual Manual pdf 5 page image

5Subject to change without noticeGeneral InformationThis oscilloscope is easy to operate. The logical arrangementof the controls allows anyone to quickly become familiar withthe operation of the instrument, however, experienced usersare also advised to read through these instructions so that allfunctions are understood.Immediately after unpacking, the instrument should bechecked for mechanical damage and loose parts in the interior.If there is transport damage, the supplier must be informedimmediately. The instrument must then not be put intooperation.SymbolsATTENTION - refer to manualDanger - High voltageProtective ground (earth) terminalUse of tilt handleTo view the screen from the best angle, there are three dif-ferent positions (C, D, E) for setting up the instrument. If theinstrument is set down on the floor after being carried, thehandle automatically remains in the upright carrying position(A).In order to place the instrument onto a horizontal surface,the handle should be turned to the upper side of theoscilloscope (C). For the D position (10° inclination), the handleshould be turned to the opposite direction of the carryingposition until it locks in place automatically underneath theinstrument. For the E position (20° inclination), the handleshould be pulled to release it from the D position and swingbackwards until it locks once more.The handle may also be set to a position for horizontal carryingby turning it to the upper side to lock in the B position. At thesame time, the instrument must be lifted, because otherwisethe handle will jump back.SafetyThis instrument has been designed and tested in accordancewith IEC Publication 1010-1 (overvoltage category II, pollutiondegree 2), Safety requirements for electrical equipment formeasurement, control, and laboratory use. The CENELECregulations EN 61010-1 correspond to this standard. It hasleft the factory in a safe condition. This instruction manualcontains important information and warnings which have tobe followed by the user to ensure safe operation and to retainthe oscilloscope in a safe condition.The case, chassis and all measuring terminals areconnected to the protective earth contact of theappliance inlet. The instrument operates according toSafety Class I (three-conductor power cord withprotective earthing conductor and a plug with earthingcontact).The mains/line plug shall only be inserted in a socket outletprovided with a protective earth contact. The protective actionmust not be negated by the use of an extension cord withouta protective conductor.The mains/line plug should be inserted beforeconnections are made to measuring circuits.The grounded accessible metal parts (case, sockets, jacks)and the mains/line supply contacts (line/live, neutral) of theinstrument have been tested against insulation breakdownwith 2200V DC.Under certain conditions, 50Hz or 60Hz hum voltages canoccur in the measuring circuit due to the interconnection withother mains/line powered equipment or instruments. Thiscan be avoided by using an isolation transformer (Safety ClassII) between the mains/line outlet and the power plug of thedevice being investigated.Most cathode-ray tubes develop X-rays. However, the doseequivalent rate falls far below the maximum permissiblevalue of 36pA/kg (0.5mR/h).Whenever it is likely that protection has been impaired, theinstrument shall be made inoperative and be secured againstany unintended operation. The protection is likely to beimpaired if, for example, the instrument• shows visible damage,• fails to perform the intended measurements,• has been subjected to prolonged storage underunfavourable conditions (e.g. in the open or in moistenvironments),• has been subject to severe transport stress (e.g. in poorpackaging).Operating conditionsThe instrument has been designed for indoor use.The permissible ambient temperature range during operationis +10°C (+50°F) ... +40°C (+104°F). It may occasionally besubjected to temperatures between +10°C (+50°F) and -10°C(+14°F) without degrading its safety. The permissible ambienttemperature range for storage or transportation is -40°C (-40°F) ... +70°C (+158°F).The maximum operating altitude is up to 2200m (non-operating 15000m). The maximum relative humidity is up to80%.If condensed water exists in the instrument it should beacclimatized before switching on. In some cases (e.g.extremely cold oscilloscope) two hours should be allowedbefore the instrument is put into operation. The instrumentshould be kept in a clean and dry room and must not beoperated in explosive, corrosive, dusty, or moistenvironments. The oscilloscope can be operated in anyposition, but the convection cooling must not be impaired.The ventilation holes may not be covered. For continuous