Hameg HM304 Manual

Hameg HM304 Manual Manual pdf 6 page image

Subject to change without notice6operation the instrument should be used in the horizontalposition, preferably tilted upwards, resting on the tilt handle.The specifications stating tolerances are only valid ifthe instrument has warmed up for 30minutes at anambient temperature between +15°C (+59°F) and +30°C(+86°F). Values without tolerances are typical for anaverage instrument.EMCThis instrument conforms to the European standardsregarding the electromagnetic compatibility. The appliedstandards are: Generic immunity standard EN50082-2:1995(for industrial environment) Generic emission standardEN50081-1:1992 ( for residential, commercial und lightindustry environment).This means that the instrument has been tested to the higheststandards.Please note that under the influence of strongelectromagnetic fields, such signals may be superimposedon the measured signals. Under certain conditions this isunavoidable due to the instrument‘s high input sensitivity,high input impedance and bandwidth. Shielded measuringcables, shielding and earthing of the device under test mayreduce or eliminate those effect‘s.WarrantyHAMEG warrants to its Customers that the products itmanufactures and sells will be free from defects in materialsand workmaship for a period of 2 years. This warranty shallnot apply to any defect, failure or damage caused by improperuse or inadequate maintenance and care. HAMEG shall notobliged to provide service under this warranty to repairdamage resulting from attempts by personnel other thanHAMEG represantatives to install, repair, service or modifythese products.In order to obtain service under this warranty, Customersmust contact and notify the distributor who has sold theproduct.Each instrument is subjected to a quality test with 10 hourburn-in before leaving the production. Practically all earlyfailures are detected by this method. In the case of shipmentsby post, rail or carrier it is recommended that the originalpacking is carefully preserved. Transport damages anddamage due to gross negligence are not covered by theguarantee.In the case of a complaint, a label should be attached to thehousing of the instrument which describes briefly the faultsobserved. If at the same time the name and telephonenumber (dialing code and telephone or direct number ordepartment designation) is stated for possible queries, thishelps towards speeding up the processing of guaranteeclaims.MaintenanceVarious important properties of the oscilloscope should becarefully checked at certain intervals. Only in this way is itlargely certain that all signals are displayed with the accuracyon which the technical data are based. The test methodsdescribed in the test plan of this manual can be performedwithout great expenditure on measuring instruments.However, purchase of the HAMEG scope tester HZ 60,which despite its low price is highly suitable for tasks of thistype, is very much recommended.The exterior of the oscilloscope should be cleaned regularlywith a dusting brush. Dirt which is difficult to remove on thecasing and handle, the plastic and aluminium parts, can beremoved with a moistened cloth (99% water +1% milddetergent). Spirit or washing benzine (petroleum ether) canbe used to remove greasy dirt. The screen may be cleanedwith water or washing benzine (but not with spirit (alcohol)or solvents), it must then be wiped with a dry clean lint-freecloth. Under no circumstances may the cleaning fluid getinto the instrument. The use of other cleaning agents canattack the plastic and paint surfaces.Protective Switch-OffThis instrument is equipped with a switch mode power supply.It has both overvoltage and overload protection, which willcause the switch mode supply to limit power consumptionto a minimum.In this case a ticking noise may be heard.Power supplyThe oscilloscope operates on mains/line voltages between100VAC and 240VAC. No means of switching to differentinput voltages has therefore been provided.The power input fuses are externally accessible. Thefuseholder is located above the 3-pole power connector.The power input fuses are externally accessible, if the rubberconector is removed. The fuseholder can be released bypressing its plastic retainers with the aid of a smallscrewdriver. The retainers are located on the right and leftside of the holder and must be pressed towards the center.The fuse(s) can then be replaced and pressed in until lockedon both sides.Use of patched fuses or short-circuiting of the fuseholder isnot permissible; HAMEG assumes no liability whatsoever forany damage caused as a result, and all warranty claimsbecome null and void.Fuse type:Size 5x20mm; 0.8A, 250V AC fuse;must meet IEC specification 127,Sheet III (or DIN 41 662or DIN 41 571, sheet 3).Time characteristic: time-lag (T).Attention!There is a fuse located inside the instrument withinthe switch mode power supply:Size 5x20mm; 0.5A, 250V AC fuse;must meet IEC specification 127,Sheet III (or DIN 41 662or DIN 41 571, sheet 3).Time characteristic: fast (F).This fuse must not be replaced by the operator!