OPERATING INSTRUCTIONS
Contents
1. other One side of the receptacle should be hot and produce the The wave from The other side of the receptacle is the ac return and nowaveform should result EQUIPMENT PROTECTION PRECAUTIONS l eS CAUTION The following precautions will help avoid damage to the oscilloscope Never allow a small spot of high brilliance to remain stationary on the screen for more than a few seconds The screen may become permanently burned A spot will occur when the scope is set up for X Y operation and no signal is applied Either reduce the intensity so the spot is barely visible apply signal or switch back to normal sweep operation It is also advisable to use low intensity with AUTO triggering and no signal applied for long periods A high intensity trace at the same position could cause a line to become permanently burned onto the screen Do not obstruct the ventilating holes in the case as this will increase the scope s internal temperature Excessive voltage applied to the input jacks may damage the oscilloscope The maximum ratings of the inputs are as follows CH 1 and CH 2 400 V dc ac peak EXT TRIG 300 V dc ac peak 4 Always connect a cable from the ground terminal GN 3 of the oscilloscope to the chassis of the equipment under test Without this precaution the entire current for the equipment under test may be drawn through the probe clip leads under certain circumstances Such condi2. OPERATING INSTRUCTIONS SAFETY PRECAUTIONS ph The following precautions must be observed to help prevent electric shock When the oscilloscope is used to make measurements in equipment that contains high voltage there 1s always a certain amount of danger from electrical shock The person using the oscilloscope in such conditions should be a qualified electronics technician or otherwise trained and qualified to work in such circumstances Observe the TEST INSTRUMENT SAFETY recommendations listed on the inside front cover of this manual Do not operate this oscilloscope with the case removed unless you are a qualified service technician High voltage up to 2100 volts is present when the unit is operating with the case removed The ground wire of the 3 wire ac power plug places the chassis and housing of the oscilloscope at earth ground Use only a 3 wire outlet and do not attempt to defeat the ground wire connection or float the oscilloscope to do so may pose a great safety hazard Special precautions are required to measure or observe line voltage waveforms with any oscilloscope Use the following procedure a Do not connect the ground clip of the probe to either side of the line The clip is already at earth ground and touching it to the hot side of the line cause possible injury plus possible damage to the scope or probe b Insert the probe tip into one side of the line voltage receptacle then the
3. tions could also pose a safety hazard which the ground cable will prevent The probe ground clips are at oscilloscope and earth ground and should be connected only to the earth ground or isolated common of the equipment under test To measure with respect to any point other than the common use CH 2 CH 1 subtract operation ADD mode and INV 1 with the channel 2 probe to the point of measurement and the channel 1 probe to the point of reference Use this method even 1f the reference point is a DC voltage with no signal
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