Kenwood CS-6040 Instruction Manual

14. PULSE JITTER MEASUREMENTPulse jitter can be measured as follows:(1) Normal Procedures1) Apply the signal to the input connector. Select the chan-nel to be used with the V E R T I C A L MODE.Adjust each control for normal s w e e p display. T h e n ,adjust the V O L T S / D I V control to obtain proper w a v e -form display. Especially, the trigger-related controlsmust be carefully adjusted for stable display. Set theA S W E E P T I M E to C A L .2) Select A INT B of the H O R I Z O N T A L MODE s w i t c h e s .Set the B S O U R C E to A F T . D . Adjust the D E L A Y P O S I -TION so that the pulse to be measured is intensity-modulated.3) Adjust the B S W E E P T I M E / D I V so that the whole por-tion where jitters are produced is intensity-modulated.4) Select B of the H O R I Z O N T A L MODE s w i t c h e s . Meas-ure the horizontal deviation of the jittered pulses. Timeof jitters can be determined by multiplying this horizon-tal distance by B S W E E P T I M E / D I V setting.Pulse jitter =Horizontal distance of jitters (div)x BS W E E P T I M E / D I V setting[EXAMPLE]In the example s h o w n in Fig. 5 3 , the jitter width is 1.6divisions. If B S W E E P T I M E / D I V setting is 0 . 2 jis.Pulse jitter = 1.6 (div) x 0 . 2 (/*s) = 0 . 3 2 ps(2) Cursor Measurement Procedures1) Display the w a v e f o r m to be measured on the C R T ac-cording to items 1) to 3) of the normal procedures.2) Select B of the H O R I Z O N T A L MODE s w i t c h e s . Alsoselect the AT cursor mode.3) Adjust the AREF cursor to the left of the t w o points tobe measured and the /(cursor to the right.4) Measured value is displayed following AT in the upperright of the C R T .M e a s u r e d v a l u e -Fig. 5 415. SWEEP MAGNIFICATIONThe apparent magnification of the delayed s w e e p operationdepends on setting of the A and B S W E E P T I M E / D I Vcontrols.1) Apply the signal to the input connector. Select the chan-nel to be used with the V E R T I C A L M O D E . Adjust eachcontrol for normal s w e e p display. Adjust the V O L T S /DIV to obtain proper w a v e f o r m display.2) Adjust the A S W E E P T I M E / D I V to display several cy-cles of waveform on the C R T . T h e n , set the B S O U R C Eswitch to A F T . D . By selecting then A INT B of theH O R I Z O N T A L M O D E s w i t c h e s , the part to be magni-fied is intensity-modulated and displayed brilliantly.3) Move the intensity-modulation part to the part to bemagnified with the D E L A Y P O S I T I O N . Adjust the BS W E E P T I M E / D I V so that the whole part to be magni-fied is intensity-modulated.4) Select A L T or B of the H O R I Z O N T A L MODE s w i t c h e s .Move the waveform to an easy-to-see position with the• POSITION and T R A C E S E P controls.5) Time measurement can be executed under the condi-tion where the B s w e e p trace is displayed in the samemanner a s the A s w e e p . Setting of the B S W E E PT I M E / D I V is the s w e e p ratio for this measurement.T o find the apparent magnification of the magnifiedwaveform, divide A S W E E P T I M E / D I V setting by BS W E E P T I M E / D I V setting.Apparent magnification of s w e e p ratioA S W E E P T I M E / D I V settingB S W E E P T I M E / D I V setting41R E F c u r s o rc u r s o rP u l s e jitterFig. 5 3