Kenwood CS-6040 Instruction Manual

M e a s u r e d v a l u e -Fig. 4 310. TIME RATIO MEASUREMENTThe following describes procedures for measuring duty ra-tio of square w a v e s , etc.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 , set theA C / D C s w i t c h to D C , deactivate the GND s w i t c h , andadjust each control for the normal s w e e p display. T h e n ,adjust the V O L T S / D I V and S W E E P T I M E / D I V to obtainproper w a v e f o r m observation.2) Adjust the one cycle width of the signal to 5 divisionswith the S W E E P T I M E V A R I A B L E . If necessary, use the^ • P O S I T I O N .3 ) Select the AT cursor mode with the C U R S O R S .NOTE: Time ratio can be measured if the S W E E P T I M Eis not set to C A L .4) Adjust the z l R E F cursor to the left of the points to bemeasured and the ^ c u r s o r to the right.5) Measured duty ratio supposing 5 divisions as 1 0 0 % isdisplayed in percentage following R A T I O in the upperright of the C R T .Fig. 4 4[ E X A M P L E ]Supposing the measured period is 4 0 jts and S W E E PT I M E / D I V setting is 5 /ts/div in the example s h o w n inFig. 0 0 ,Frequency = - -- = 2 . 5 x 1 0 4= 2 5 kHz4 0 x 1 0 " 6T h e above method s h o w s how to determine frequencybased on a measured period of a cycle. Frequency can alsobe determined by counting the number of cycles on the C R T .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 , and adjusteach control for the normal s w e e p display. Set theV A R I A B L E used channel and S W E E P T I M E to C A L con-dition.2) Count the number of cycles between any vertical gradu-ation lines. Find time of the c y c l e s from the horizontaldistance between the lines and S W E E P T I M E / D I V set-ting. Multiple a reciprocal of the time by the numberof c y c l e s . T h i s method, however, will c a u s e measure-ment errors for signals with a f e w number of c y c l e s .r Number of c y c l e sFrequency = 1—Horizontal distancex S W E E P TIME/DIV setting[ E X A M P L E ]In the example s h o w n in Fig. 4 6 , 10 c y c l e s cove 7 di-visions.If S W E E P T I M E / D I V setting is 5 jis/div,Frequency = = 2 8 5 . 7 kHz7 (div) x 5 (/ts/div)37I R E F c u r s o r c u r s o r1 1 . FREQUENCY MEASUREMENT(1) Normal ProceduresSince frequency is a reciprocal of a period, it can be deter-mined by measuring time of one cycle.1) Measure time of one cycle according to the proceduresmentioned in section 5 T I M E M E A S U R E M E N T . Themeasured time is a period of the signal.2) Calculate a reciprocal of the measured time to deter-mine frequency as follows:Frequency =PeriodP e r i o d o f 1 c y c l e = 4 0 ( 5 j i s / d i v x 8 d i v )Fig. 4 5M e a s u r e d v a l u eI R E F c u r s o r c u r s o r