OPERATING INSTRUCTIONS
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1. OPERATING INSTRUCTIONS 3 To view both waveforms simultaneously set the VERTical MODE switch to DUAL and select either ALT alternate or CHOP with the PULL CHOP switch 4 In the ALT sweep mode PULL CHOP switch pushed in one sweep displays the channel 1 sign a land the next sweep displays the channel 2 signal in an alternating sequence Alternate sweep is normally used for viewing high frequency or high speed waveforms at sweep times of 1 ms div and faster but may be selected at any sweep time Nn In the CHOP sweep mode PULL CHOP switch pulled out the sweep is chopped switched between channel and channel 2 Using CHOP one channe Idoes not have to wait for a complete swept display of the other channel Therefore portions of both channel s waveforms are displayed with the phase relationship between the two waveforms unaltered Chop sweep is normally used for low frequency or lowspeed waveforms at sweep times of 1 ms div and slower or where the phase relationship between channel and channel 2 requires measurement If chop sweep is used at sweep times of 0 2 ms div and faster the chop rate becomes a significant portion of the sweep and may become visible in the displayed waveform However you may select chop sweep at any sweep time for special applications 6 Adjust the channel 1 and 2 POSition controls to place the channel 1 trace above the channel 2 trace Set the CH 1 and CH 2 VOLTS DIV controls to a po2. o the TVH position and vertical sync pulses are selected as trigger when the trigger COUPLING switch is set to the TV V position The TV H and TV V positions may also be used as low frequency reject and high frequency reject coupling respectively Additional procedures for observing video waveforms are given later in this section of the manual
3. sition that gives 2 to 3 divisions of vertical deflection for each trace If the display on the screen is unsynchronized refer to the Tiggering paragraphs in this section of the manual for procedures for setting triggering and sweep time controls to obtain a stable display showing the desired number of waveforms oo When the VERTicalIMODE switch is set to ADD the algebraic sum of CH 1 CH 2 is displayed as a single trace When the PULL INV switch is pulled out the algebraic difference of CH 1 CH 2 is displayed O If two waveforms have no phase or frequency relationship there is seldom reason to observe both waveforms simultaneously However these oscilloscopes do permit the simultaneous viewing of two such unrelated waveforms using alternate triggering Refer to the paragraphs on Triggering Trigger SOURCE Switch for details on alternate triggering TRIGGERING The Oscilloscopes provide versatility in sync triggering for ability to obtain a stable jitter free display in single trace or dual trace operation The proper settings depend upon the type of waveforms being observed and the type of measurement desired An explanationof the various controls which affect synchronization is given to help you select the proper setting over a wide range of conditions Trigger COUPLING Switch 1 N uw 32 In the AUTO position automatic sweep operation is selected In automatic sweep operation the sweep genera
4. tor free runs to generate a sweep without a trigger signal However it automatically switches to triggered sweep operation if an acceptable trigger source signal is present The AUTO position is handy when first setting up the scope to observe a waveform it provides sweep for waveform observation until other controls can be properly set Once the controls are set operation is often switched back to the normal triggering mode since it is more sensitive Automatic sweep must be used for dc measurements and signals of such low amplitude that they will not trigger the sweep The NORM position provides normal triggered sweep operation The sweep remains at rest until the selected trigger source signal crosses the threshold level set by the TRIG LEVEL control The trigger causes one sweep to be generated after which the sweep again remains at rest until triggered In the normal triggering mode there will be no trace unless an adequate trigger signal is present In the ALT VERTICAL MODE of dua Itrace operation with the SOURCE switch also set to ALT there will be no trace unless both channel 1 and channel 2 signals are adequate for triggering Typically signals that produce even one division of vertical deflection are adequate for normal triggered sweep operation The TV H and TV V positions are primarily for viewing composite video waveforms Horizontal sync pulses are selected as trigger when the trigger COUPLING switch is set t
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