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on the  D i s p l a y is not updated  u n t i l ! the new 

measurement cycle is completed. 

Even if decimal point place and leading zeroes 

are corrected, and a new measurement value 

then appears on the  L E D display, it may be 

inaccurate due to display delay. Please keep it 

in mind. 

6 - 3

 Duty cycle measurement mode 

The duty cycles of digit signals can be meas-

ured by placing the counter in the time inter-

v a l measurement mode. 

The duty cycle can be measured by specifying 

the  t w o edges (negative-going edge and positive-

going edge) of the  t w o signals on channels A 

and  B . Select the positive-going edge (leading 

edge of  T 1 ) of the signal on channel A while 

select the negative-going edge  ( t a i l i n g edge of  T 1 ) 

of the signal on channel  B . 

The duty cycle measurement mode can  s t a r t when 

the positive-going edge of the channel-A signal is 

detected and then ends when the negative-going 

edge of the channel-B signal is detected. 

Use (+) slope  f o r the  C H A N N E L A selection 

while  ( - ) slope  f o r the  C H A N N E L B selection. 

See  F i g u r e 5. 

Next, the period (place the counter in the period 

measurement mode  t h a t is to be discussed next) 

should be measured. The measurement period 

d a t a  w i l l be used in the  f o l l o w i n g expression to 

calculate the duty cycle. 

D u t y cycle =  T V c y c l e x 100% 

Figure 5  D u t y cycle measurement 

35 

Cycle • 

Содержание FC-757

Страница 1: ... PRINTED IN N B50 7726 00 N 06106 UNIVERSAL COUNTER FC 757 INSTRUCTION MANUAL KENWOOD CORPORATION KENWOOD ...

Страница 2: ... C A U T I O N S F O R USE 7 4 P A N E L E X P L A N A T I O N 8 4 1 F R O N T P A N E L 8 4 2 R E A R P A N E L 15 4 3 C A S E S U R F A C E 18 5 O P E R A T I N G P R O C E D U R E S 19 6 M E A S U R I N G C O N S I D E R A T I O N S 34 7 M A I N T E N A N C E 39 2 ...

Страница 3: ...al This function would output higher precision measurement data in relatively low frequency operation mode Time measurement function The time measurement function is used to measure the interval time between any two edges of different two signals and between two single shot pulse signals Event Input total count measurement function The event input total count measurement function is used to measur...

Страница 4: ...ccuracy trigger error Resolution 100ps to 100ns Unit ms s Minimum pulse width 250ns Magnification Gate time x 1 x10 x100 X1000 Frequency Ratio Measurement A B Measurement range A 5Hz to 10MHz Measurement range B 5Hz to 2MHz Denominator magnification Denominator magnification N x 1 x10 X100 X1000 Accuracy F A X N T R I 9 9 E R E R R R N magnification T i m e Interval Measuement A to B J Measurement...

Страница 5: ...mVr m s 5Hz to 10MHz MHz mode 50mVr m s 5MHz to 125MHz 100mVr m s 125MHz to 150MHz 150mVr m s 150MHz to 175MHz Impedance 1 2MO 40pF or less Maximum input voltage 250Vr m s at 5Hz to 60Hz Attenuation x1 1 1 x10 1x10 Low pass filter 10kHz 3 d B slope selectable Trigger level Presetable or variable about 1V Input Characteristics Channel B Frequency band width 5Hz to 2MHz Coupling A C coupling Sensiti...

Страница 6: ...t value of the internal time base timer 10 0MHz Counting time Gate time 0 01s 0 1s 1 0s 10s Resolution 0 1Hz to 100Hz General Requirements Power supply voltage 100 120 220 240VAC 10 max 250V 50 60Hz Power comsunption 20VA Within specifications temperature and humidity 23 C 5 C 70 R H Operating temperature and humidity 0 C to 40 C 80 RH Dimentions 240 W x64 H x190 D mm max 260 W x70 H x210 D mm Wei...

Страница 7: ...he sunlight High temperature and High humidity Mechanical vibration and Electrical shock c The maximum input voltage levels of this counter are as follows Front panel Channel A Input juck 250Vrms 5Hz to 60Hz Front panel Channel B Input j U c k 125Vrms 5Hz to 60Hz Rear panel T O T A L I Z E S T A R T S T O P Input juck 5 V Rear panel E X T IN input juck 10Vrms d This counter can start its operation...

Страница 8: ...erz The L E D indicates that the measurement value is displayed in microseconds if a period or time interval is being measured This L E D indicator becomes inactive when the frequency ratio meas urement mode or the event total count measure ment mode has been started up MHz ms Indicator L E D The MHz ms L E D indicator is provided to remind the user of the current measurement data unit This L E D ...

Страница 9: ...Figure 1 Front panel 9 ...

Страница 10: ...gain x 1 the input signal to channel B reaches the counter without attenuatjon Note that this switch can work together with channel B only but does not affect channel A S L O P E Switch The S L O P E switch is provided to permit the user to select positive going edge or negative going edge of the C H A N N E L B signal for syn chronization If this switch is pressed m negative going edge will be se...

Страница 11: ...ected for synchronization If this switch is pressed again J B L positive going edge will be selected for synchronization L P F Switch The L P F switch is used to enable the low pass filter circuit operation If this switch is pressed m the input signal to channel A is forced to enter a low pass filter of about 10kHz If pressed again J B _ the input signal reaches the counter directly This L P F swi...

Страница 12: ...held is not updated until the new measurement is complete b Event total counter T O T A L A mode If this switch is pressed the current measurement value indicated by the display L E D s is held and the event total count is terminated If pressed again J H L a new counting operation will be started Note that the T T L level of the gate input signal to the T O T A L I Z E I N P U T S T O P input j u ...

Страница 13: ... switch and indicated by either display unit indicator L E D or D The display resolution can be selected with G A T E switch The measurement frequency ranges in each display range are as follows kHz range 5Hz to 10MHz Measurement sensitivity 5Hz to 5MHz 20mV rms MHz range 1MHz to 175MHz Measurement sensitivity 5MH to 125MHz 50mV rms 125MHz to 150MHz 100mV rms 150MHz to 175MHz 150mV rms The proper ...

Страница 14: ...ment unit display L E D or The display resolution can be selected with G A T E switch e T O T A L A event input total count mode The T O T A L A mode is an operational mode in which this product measures the number of channel A input cycles and then outputs each count value to the display continuously This cycle count and display operations can be externally controlled with the gate signal input t...

Страница 15: ... input signal to this terminal becomes active T T L level H The event input count operation is forced to terminate if the input signal to this terminal becomes inactive T T L level L The event input count operation is also disabled if this terminal is grounded to the chassis ground E X T IN Juck If O S C I L L A T O R E X T I N T switch is set to the E X T left position this terminal is used as an...

Страница 16: ...tage that is applied to the counter When you change the current supply voltage refer to section 7 1 Maintenance Power input connector The power input connector is provided for connecting a power cord to the counter Use the accessory power cord Fuse holder The fuse holder is provided to enable the user to set a protection fuse in the counter For the 100V or 120V power requirement use the 0 25A 250V...

Страница 17: ...Figure 2 Rear panel 17 ...

Страница 18: ... case surface This opening is provided for fine adjustment of the internal T C X O standard oscillator The opening is normally covered with a rubber cap If the T C X O needs to be fine adjusted please contact your dealer Figure 3 Case surface 18 ...

Страница 19: ...requency Measurement with Channel A 5Hz to 175MHz 1 Input a target signal to be measured to C H A N N E L A input juck 2 Select the F R E Q A mode by using F U N C switch 3 Select the measurement unit with display unit select switch If the display unit select switch is pressed J M the measurement value will be displayed in MHz ms In this case display unit L E D will be turned on If the switch is p...

Страница 20: ...That is the display value being held by the H O L D switch is updated by the output value from the new measurement operation 7 If R E S E T switch is pressed during frequency measurement the measurement value on the Display will be reset to 0 If released a new measurement cycle will be started However the measurement value will remain 0 until the new cycle is complete Input Adjustment Functions 1 ...

Страница 21: ...e is displayed in MHz ms this switch is bypassed A s a result the count operation is carried out in synchronization with negative going edge 4 Trigger Level Adjustment The trigger level of the input signals to the C H A N N E L A input juck can be changed by T R I G L E V E L control The functions of this control are as follows a If the control is pressed P R E S E T position the trigger level is ...

Страница 22: ... all the cycle times The display resolution L E D s from the left indicates 1 10 100 and 1000 The average cycle time of all the period measured is output to Display G A T E L E D 2 blinks during the period measurement The measurement value on the display will be updated at the moment when one cycle measurement is complete when the G A T E L E D turns off The G A T E L E D blinking may not be confi...

Страница 23: ...t juck should be equal to or greater than that of the C H A N N E L B input signals for higher resolution In addition the frequencies of the input signals on the both channels should be within their ratings The frequency ratio between the two channel input signals is defined as follows The ratio of number of cycles on C H A N N E L A to the total time of the specified number of cycles on C H A N N...

Страница 24: ...s case refer to section 5 6 Display Description 6 If H O L D switch is turned on during frequency ratio measurement the current measurement value on the Display is held as it is If it is turned off a new measurement cycle will be started However the measure ment value currently being displayed will remain unchanged until the new measurement cycle is complete That is the display value being held by...

Страница 25: ... B and 2 Select the time interval measurement mode TI A B with F U N C switch Symbol A B indicates that the transition time from channel A to channel B is measured 3 Specify desired signal edges of the two signals on channels A and B by using C H A N N E L A and C H A N N E L B S L O P E switches and If these switches are pressed the negative going edge will be selected If left open ML the positiv...

Страница 26: ...on 8 If H O L D switch is turned on during measurement the current measurement value on the Display is held as it is If it is turned off a new measurement cycle will be started However the measurement value currently being displayed will remain unchanged until the new measurement cycle is complete That is the display value being held by the H O L D switch is updated by the output value from the ne...

Страница 27: ...ber of events generated during a fixed certain period is measured This measurement period can be set by using the front panel switch or the rear panel gate signal input juck The signal input circuit and the counter are coupled with capacitance A C which requires at least 5 events per second to be generated 1 Select the T O T A L A input total measurement mode with F U N C switch The selection by G...

Страница 28: ...L E D will be turned on while the counting operation still continue 5 The counting operation may terminate in the following three cases The T T L level of the input gate signal to the T O T A L I Z E INPUT S T A R T S T O P juck is L In this case the counting measurement is terminated and the total count value is held by the Display If the gate signal changes its T T L level from L to H the counti...

Страница 29: ...S T A R T S T O P input juck in any measurement mode other than the event total count meas urement mode Note If the input signals with noise and ringing superimposed on reach the counter they may cause an error dur ing event total count measurement In such a case refer to the Input Ad justment Functions of section 5 1 Fre quency Measurement 5 6 Display Description 5 6 1 Display Layout Figure 4 Var...

Страница 30: ...1Hz 0 001kHz to 10Hz 0 00001MHz If Figure 4 a shows that a period or time interval is being measured and the MHz ms mode is selected with display unit select switch the display value will changes to 7 1 234567 Unlike the frequency measure ment the display resolution 0 001 f s 0 000001ms does not change but the display unit is changed In this case the decimal point moves three digits in the left di...

Страница 31: ...In the period measure ment and time interval measurement modes pseudo trigger signal may cause measure ment error This measurement error can be reduced by increasing the number of meas urement cycles by selecting a greater G A T E time value That is a smaller resolution value than the current one should be set for that purpose However if many cycles are handled in the time interval measurement mod...

Страница 32: ...n a selected measurement mode and specified resolution value That is the end of the pe riod can be defined differently This delay has significance in some cases When you are about to change resolution values op erational modes or to use the hold or re set function you should take that delay into consideration because a new measure ment operation will start In the following paragraphs the relation ...

Страница 33: ...s 0 01 10 kHz ps 0 001 j s 100 kHz is 0 0001 fis 1000 MHz ms 0 0001ms 1 MHz ms 0 00001ms 10 MHz ms 0 000001ms 100 3 Frequency ratio mode The frequency ratio mode requires two signals to be input to the counter input jucks C H A N N E L A and C H A N N E L B input jucks The counter starts measuring each of the input signals and stops it when the number of counts on the C H A N N E L B reaches a spe...

Страница 34: ...be The input impedance 1 2Megaohm and 40pF or less of the C H A N N E L A input juck is not af fected through manipulation of A T T x 10 switch The circuit load can be reduced by connecting the attenuator probe to the C H A N N E L A input juck Set the attenuator probe to the x 10 po sition to reduce the circuit load This applies to C H A N N E L B N O T E If 10 1 attenuator probe is used ver ify ...

Страница 35: ...nels A and B Select the positive going edge leading edge of T1 of the signal on channel A while select the negative going edge tailing edge of T1 of the signal on channel B The duty cycle measurement mode can start when the positive going edge of the channel A signal is detected and then ends when the negative going edge of the channel B signal is detected Use slope for the C H A N N E L A selecti...

Страница 36: ...mode produces the same measurement error irrespective of resolution settings 36 6 5 Use of T R I G L E V E L control T R I G L E V E L control is provided to adjust the trigger levels of the input signals to C H A N N E L A If the adjust is pressed set to the P R E S E T position almost the average level of the input signals is selected as the trigger level Almost the all the operations can be per...

Страница 37: ... counter input is logically connected to the time base oscillator 2 Change the resolution values by using the G A T E switch with display unit select switch pressed after the counter has entered the self check mode and then verify that the output results agree to those listed below Resolution value setting Output display G A T E time o 2 measurement interval period 0 01s 1 0 1s 10 1 0s 100 10s 100...

Страница 38: ...8 8 8 A t the same time the MHz ms indication L E D and the O V E R F L O W L E D will both turn on And the G A T E L E D will become active for 10 seconds Otherwise the counter has some circuit trouble 5 press H O L D switch the current measure ment value on the display will be held The G A T E L E D remains inactive while the H O L D switch is being held down The G A T E L E D will resume blinki...

Страница 39: ... the broken fuse with a proper fuse 2 Change in power supply voltage If a different level power supply voltage needs to be applied to the product use power supply voltage selector labeled as L I N E V O L T A G E S E L E C T according to the voltage select information on its left Bear in mind that voltage change results requires a new fuse rating Case 1 Voltage change from 100V 120V to 220V 240V F...

Страница 40: ...A p r o d u c t o f KENWOOD CORPORATION 1 7 5 2 chome Shibuya Shibuya ku Tokyo 150 Japan ...

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