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Kenwood CS-3025 Instruction Manual

20mhz compact oscilloscope
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20MHz C O M P A C T O S C I L L O S C O P E
CS-3025
INSTRUCTION MANUAL
K E N W O O D
C O R P O R A T I O N
©PRINTED IN JAPAN B50-7683-00(T)
90/12 1110 9 8 7 6 5 4 3 2 1
89/12 11 10 9 8 7 6 5 4 3 2

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  • Page 1 20MHz C O M P A C T O S C I L L O S C O P E CS-3025 INSTRUCTION MANUAL K E N W O O D C O R P O R A T I O N ©PRINTED IN JAPAN B50-7683-00(T)

  • Page 2: Safety

    SAFETY Symbol in T h i s Manual This symbol indicates where applicable cautionary or other imformation is to be found. Power Source T h i s equipment operates from a power source that does not apply more than 2 5 0 V rms between the supply conductors or between either supply conductor and ground.

  • Page 3: Table Of Contents

    C O N T E N T S S A F E T Y OVERVIEW AND CONFIGURATION SPECIFICATIONS PREPARATION FOR USE CONTROLS AND INDICATORS FRONT PANEL REAR PANEL BOTTOM PANEL OPERATION • INSTAL STARTING PROCEDURE [1] NORMAL S W E E P DISPLAY OPERATION [2] MAGNIFIED S W E E P OPERATION [3] X - Y OPERATION [4] VIDEO SIGNAL OBSERVATION...

  • Page 4: Overview And Configuration

    OVERVIEW AND CONFIGURATION OVERVIEW This unit is a compact, light-weight, high performance portable oscilloscope equipped with rectangular C R T w i t h internal graticule. T h e frequency bandwidth of 2 0 MHz and selectable s w e e p time of 0 . 2 jis/div to 1 s/div for the vertical axis allows use for a wide range of applications.

  • Page 5: Specifications

    SPECIFICATIONS Type Rectangular high luminance C R T (with internal graticule) Acceleration Voltage Approx. 1.8 k V Display Area 8 x 10 div flat-face (1 div = 6 . 3 5 mm) VERTICAL A X I S Operating Modes C H 1 , C H 2 , A L T , C H O P , A D D Sensitivity 5 mV/div to 5 V/div, + / - 3 %...
  • Page 6 S W E E P S w e e p T y p e N O R M : Triggering s w e e p A U T O : S w e e p free runs in absence of trigger S w e e p T i m e 0 .

  • Page 7: Preparation For Use

    PREPARATION FOR U S E S A F E T Y Before connecting the instrument to a power source, carefully read the following infor- mation, then verify that the proper power cord is used and the proper line fuse is installed for power source.
  • Page 8 6. Operation adjacent to equipment w h i c h produces strong A C magnetic fields should be avoided where possible. This includes such devices as large power supplies, transformers, electric motors, etc., that are often found in an industrial environment. Strong magnetic shields can exceed the practical C R T magnetic shielding limits and result interference and distortion.

  • Page 9: Controls And Indicators

    CONTROLS AND INDICATORS FRONT PANEL Fig. 2-1 © POWER Power s w i t c h for the oscilloscope. Pressing this control once turns the power on and pressing it again turns the power off. ® Pilot Lamp Lamp lights w h e n the oscilloscope is on. (3) C A L Terminal Voltage terminal for calibration of probes.
  • Page 10 Fig. 2-2 © VARI ( A B L E ) Rotation provides fine control of channel 1 vertical attenuation. A l l o w s continuous ad- justment between V O L T S / D I V ranges. In the fully c l o c k w i s e ( C A L ) position, the verti- cal attenuator is calibrated.
  • Page 11 © VOLTS/DIV Vertical axis attenuator for channel 2. Performs the same function for channel 2 a s the channel 1 V O L T S / D I V control. S e r v e s as the X axis or Y axis attenuation adjust- ment control during X - Y operation.
  • Page 12 Fig. 2-3 © I N T E N S I T Y Adjusts the brightness of the trace. @ LEVEL/PULL SLOPE ( - ) LEVEL: Trigger level adjustment control. Determines point on trigger signal w a v e - form where s w e e p starts. SLOPE: Trigger polarity selector.
  • Page 13 ® (23) TRIG COUPLING Select the coupling method used for the trigger signal. W h e n NORM is selected w i t h s w i t c h @ , either A C coupling ( J I _ A C ) or DC coupling ( _M_ DC) can be selected with s w i t c h (§).

  • Page 14: Rear Panel

    Rear Panel Fig. 3 @ GND Terminal C h a s s i s ground terminal used for establishing a common ground with other equipment. <§) E X T . TRIG Jack Input terminal for external trigger signal. W h e n the T R I G S O U R C E @> control is set to NORM and ©...

  • Page 15: Bottom Panel

    BOTTOM PANEL Fig. 4 (§) T R A C E R O T A T I O N Electrically rotates trace to horizontal position, Adjust w h e n strong magnetic fields cause the trace to be tilted. © F O C U S Adjusts the trace for optimum f o c u s .

  • Page 16: Operation

    OPERATION INITIAL STARTING PROCEDURE Until you familiarize yourself with the use of all controls, the following procedure may be used to standarize the initial setting of controls as a reference point and to obtain trace on the C R T in preparation for waveform observation. W h e n using the probe(s), refer to probe's instructions and "...
  • Page 17 In the C H O P mode, the s w e e p is chopped at an approximate 5 0 kHz rate and s w i t c h e d between C H 1 and C H 2 . Note that in the C H O P mode of operation, the trigger source becomes the chopping signal itself, making waveform observation impossible.
  • Page 18 Trigger signal (Gate signal) • CH1 (Input signal to amplifier, etc.) C H 2 (Output signal from amplifier, etc.) Fig. 6 Triggering Level Trigger point on waveform is adjusted by the L E V E L / P U L L S L O P E ® control. Fig. 7 s h o w s the relationship between the S L O P E and L E V E L of the trigger point.

  • Page 19: Magnified Sweep Operation

    [2] MAGNIFIED SWEEP OPERATION Sfnce merely shortening the s w e e p time to magnify a portion of an observed w a v e f o r m can result in the desired portion disappearing off the screen, such magnified display should be performed using the MAGNIFIED S W E E P .

  • Page 20: Application

    APPLICATION P R O B E C O M P E N S A T I O N T o obtain an accurate measurement result, the probe must be adjusted correctly before measurement. 1 . Connect the probe to the INPUT terminal and set the control for a normal s w e e p display. 2.
  • Page 21 2. Set the T R I G MODE to A U T O and A C - G N D - D C to the GND position, w h i c h established the zero volt reference. Using the f POSITION control, adjust the trace position to the desired reference level position, making sure not to disturb this setting once made.

  • Page 22: Measurement Of The Voltage B E T W E E N Two Points On A Waveform

    M E A S U R E M E N T OF T H E V O L T A G E B E T W E E N T W O POINTS ON A W A V E F O R M T h i s technique can be used to measure peak-to-peak voltages.

  • Page 23: Elimination Of Undesired Signal Components

    ELIMINATION OF UNDESIRED SIGNAL COMPONENTS The A D D feature can be conveniently used to cancel out the effect of an undesired signal component which superimposed on the signal you w i s h to observe. Procedure: 1 . Apply the signal containing an undesired component to the C H 1 INPUT jack and the undesired signal itself alone to the C H 2 INPUT jack.

  • Page 24: Time Measurements

    TIME MEASUREMENTS T h i s is the procedure for making time measurements between t w o points on a w a v e f o r m . The combination of the S W E E P T I M E / D I V and the horizontal distance in divisions between the t w o points is used in the calculation.
  • Page 25 Fig. 13 1 cycle = 4 0 /*s (5 /ts/div. x 8 div.) [ E X A M P L E ] A period of 4 0 is observed and measured. (See Fig. 13) Substituting the given value: Freq = 1 / [ 4 0 x 1 0 " ] = 2 .

  • Page 26: Application. Of X-Y Operation

    APPLICATION. OF X-Y OPERATION * Phase Shift Measurement A method of phase measurement requires calculations based on the Lissajous patterns obtained using X - Y operations. Distortion due to non-linear amplification also can be displayed. A sine w a v e input is applied to the audio circuit being tested. T h e same sine w a v e input is applied to the vertical input of the oscilloscope, and the output of the tested circuit is applied to the horizontal input of the oscilloscope.

  • Page 27: Maintenance And Adjustment

    MAINTENANCE AND ADJUSTMENT A Caution : Read this page carefully to keep your safety. For Electric Shock Protection: Be sure to disconnect the power cable from the socket before conducting the following operation. MAINTENANCE There is high voltage used inside this unit. Never open the case. R E P L A C E M E N T OF FUSES This oscilloscope will not function if the fuse has blown.

  • Page 28: Adjustment

    ADJUSTMENT This oscilloscope w a s already fully adjusted w h e n shipped from the factory. If adjustment becomes necessary, heed the following precautions. 1. S e t the power supply voltage to the proper level. 2 . Use only insulated adjustment screwdrivers for adjustment. 3 .
  • Page 29 ADJUSTMENTS ® CH1 • ® CH2 S T E P BAL: Adjusts any vertical movement in the trace occurring w h e n the V O L T S / D I V knob is rotated. @) CH1 • © CH2 DC BAL: Adjusts any vertical movement in the trace occurring w h e n the V A R I A B L E knob is rotated.
  • Page 30 MEMO...
  • Page 31 MEMO...
  • Page 32 A product of K E N W O O D C O R P O R A T I O N 17-5, 2-chome, S h i b u y a , Shibuya-ku, Tokyo 150, J a p a n...

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