Kenwood CS-1044 Instruction Manual

Also see for CS-1025: Service manual

Signal w i t h o u t undesired componentTIME MEASUREMENTSThis is the procedure for making time measurements be-tween t w o points on a waveform. The combination of theSWEEP TIME/DIV and the horizontal distance in divisionsbetween the t w o points is used in the calculation.Procedure:1. Apply the signal t o be measured t o the INPUT jack. Setthe vertical MODE to the channel to be used. Adjust theVOLTS/DIV and SWEEP TIME/DIV for a normal display.Be sure that the VARIABLE control is set to CAL.2. Using the • POSITION control, set one of the points tobe used as a reference to coincide w i t h the horizontalcenterline. Use the * • POSITION control to set thispoint at the intersection of any vertical graduation line.3. Measure the horizontal distance between the t w opoints.Multiply this by the setting of the SWEEP TIME/DIV con-trol to obtain the time between the t w o points. Ifhorizontal " x 10 MAG " is used, multiply this further by1/10.Using the formula:Time = Horizontal distance (div) x (SWEEP TIME/DIV set-ting) x " x 10 M A G " v a l u e 1 (1/10)[EXAMPLE]For the example, the horizontal distance between the t w opoints is 5.4 divisions.If the SWEEP TIME/DIV is 0.2 ms/div w e calculate. (SeeFig. 14)Substituting the given value:Time = 5.4 (div) x 0.2 (ms) = 1.08 msFREQUENCY MEASUREMENTSFrequency measurements are made by measuring theperiod of one cycle of waveform and taking the reciprocalof this time value as the frequency.Procedure:1. Set the oscilloscope up t o display one cycle ofwaveform (one period).2. The frequency is the reciprocal of the period measured.Using the formula:Freq — — - — -period[EXAMPLE)A period of 4 0 /is is observed and measured. (See Fig. 15)Adjust t o horizontalcenter line w i t hA POSITIONSubstituting the given value:F r e q = 1 / [ 4 0 x 1 0 " 6 ] = 2 . 5 x 1 0 4 = 2 5 kHzWhile the above method relies on the measurement directlyof the period of one cycle, the frequency may also bemeasured by counting the number of cycles present in agiven time period.1. Apply the signal to the INPUT jack. Set the verticalMODE to the channel to be used and adjusting thevarious controls for a normal display. Set the VARIABLEto CAL.2. Count the number of cycles of waveform between achosen set of vertical graduation lines.Using the horizontal distance between the vertical linesused above and the SWEEP TIME/DIV, the time spanmay be calculated. Multiply the reciprocal of this value19Fig. 131 cycle = 40/iS (5/is/div. x 8 div.)Fig. 15Adjust t o the vertical scalew i t h POSITIONHorizontal distanceFig. 1 4