Kenwood CS-1044 Instruction Manual

Also see for CS-1025: Service manual

LEVELFig. 9* A u t o TriggerWhen the TRIG MODE @) selection is in AUTO, thesweep circuit becomes free-running as long as there is notrigger signal, permitting a check of GND level. When a trig-ger signal is present, the trigger point can be determined bythe LEVEL control for observation as in the normal triggersignal. When the trigger level exceeds the limit, the triggercircuit also becomes free-running where the waveformstarts running. When the LEVEL control is pushed in and/or,when the trigger signal is absent or the triggering level ex-ceeds the limit, there is no sweep.(2) M A G N I F I E D SWEEP OPERATIONSince merely shortening the sweep time to magnify a por-tion of an observed waveform can result in the desired por-tion disappearing off the screen, such magnified displayshould be performed using the MAGNIFIED SWEEP.Using the POSITION control, adjust the desired portionof waveform to the CRT. Pull out the PULLx 10 MAG con-trol to magnify the display 10 times. For this type ofdisplay the sweep time is the SWEEP TIME/DIV settingdivided by 10.(3) X - Y OPERATIONFor some measurements, an external horizontal deflectionsignal is required. This is also referred to as an X-Ymeasurement, where the Y input provides vertical deflec-tion and X input provides horizontal deflection.X-Y operation permits the oscilloscope to perform manytypes of measurements not possible w i t h conventionalsweep operation. The CRT display becomes an electronicgraph of t w o instantaneous voltages. The display may be adirect camparison of t w o voltages such as during phasemeasurement, frequency measurement w i t h Lissajouswaveforms.To use an external horizontal input, use the following pro-cedure;1. Set the TRIG MODE switch to X-Y the position.2. Use the channel 1 probe for the vertical input and thechannel 2 probe for the horizontal input.3. Adjust the amount of horizontal deflection w i t h the CH2VOLTS/DIV and VARIABLE controls.4 . The

(horizontal) POSITION @ control now servesas the horizontal position control, and the CH2 • POSI-TION control is disabled.5. All sync controls are disconnected and have no effect.(4) VIDEO S I G N A L O B S E R V A T I O NThe TV FRAME/LINE switch permits selection of vertical orhorizontal sync pulse for sweep triggering when viewingcomposite video waveforms. In the LINE position, horizon-tal sync pulses are selected as triggers to permit viewing ofhorizontal line of video. This is also the position used forviewing all non-video waveforms. In the FRAME position,vertical sync pulses are selected as triggers to permit view-ing of vertical fields and frames of video. When observingthe video waveforms, stable display is obtained on thescreen regardless the TRIG LEVEL @) control.A t most points of measurement, a composite video signalis of the polarity, that is, the sync pulses are negative andthe video is positive. In this case, use " - " SLOPE.If the waveform is taken at a circuit point where the videowaveform is inverted, the sync pulses are positive and thevideo is negative. In this case, use " + " SLOPE.(5) SINGLE SWEEP (for t h e C S - 1 0 4 4 only)Single sweep is used typically to sweep a nonperiodicwaveform once only.1. Set the TRIG MODE switch @) to AUTO or NORM. Foruse as trigger input, connect a signal of practically thesame amplitude and frequency as the signal to bedisplayed. Then set a trigger level.2. Set the TRIG MODE switch @> to REST. The LED label-ed " R E A D Y " will go on, indicating the trigger waitstate. The LED will go off upon completion of A sweep.3. Being sure that the " R E A D Y " LED is lit, connect thesignal to be observed, and set the TRIGE MODE control@> to REST so that the unit is waiting for trigger. Oncethe signal is triggered, it will be swept once and the" R E A D Y " LED will go off.NOTE: Dual trace waveform cannot be observed if thevertical MODE is set to ALT. Use the CHOP modeinstead.16SLOPE " - " RANGESLOPE " + " RANGE.