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20MHz C O M P A C T O S C I L L O S C O P E

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

CS-3025

KENWOO

Summary of Contents for CS-3025

Page 1: ...20MHz COMPACT OSCILLOSCOPE 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 CS 3025 KENWOOD ...

Page 2: ...ord To avoid electrical shock plug the power cord into a properly wired receptacle before connecting to the equipment input or output terminals Use the Proper Power Cord Use only the power cord and connector specified for your product Use the Proper Fuse To avoid fire hazard use a fuse of the correct type Do not Operate in Explosive Atmospheres To avoid explosion do not operate this product in an ...

Page 3: ...RATION 16 2 MAGNIFIED SWEEP OPERATION 19 3 X Y OPERATION 19 4 VIDEO SIGNAL OBSERVATION 19 APPLICATION 20 PROBE COMPENSATION 20 TRACE ROTATION COMPENSATION 20 DC VOLTAGE MEASUREMENTS 20 MEASUREMENT OF THE VOLTAGE BETWEEN TWO POINTS ON A WAVEFORM 22 ELIMINATION OF UNDESIRED SIGNAL COMPONENTS 23 TIME MEASUREMENTS 24 FREQUENCY MEASUREMENTS 24 APPLICATION OF X Y OPERATION 26 MAINTENANCE AND ADJUSTMENT ...

Page 4: ...ures as magnification functions for the vertical and horizontal axes single sweep function and T V sync function These features make it the ideal oscilloscope for the service bench and various types of maintenance CONFIGURATION The following items are contained in the packing case When unpacking make sure that all items have been included Oscilloscope 1 pc Probe PC 30 2 pes Panel cover 1 pc Instru...

Page 5: ...to 20 MHz 3 dB x 5 MAG used DC DC to 4 MHz 3 dB A C 5 Hz to 4 MHz 3 dB Input Impedance 1 Mohm approx 40 pF Rise Time 17 5 ns or less 20 MHz Crosstalk 4 0 dB minimum Polarity Inversion CH2 only Chop Frequency Approx 50 kHz Maximum Input Voltage 800 Vp p or 4 0 0 V DC A C peak HORIZONTAL AXIS Operating Modes X Y operation selectable with sweep knob X axis selectable with TRIG or X Y axis selectable ...

Page 6: ...g Frequency Amplitude Voltage Coupling Frequency INT EXT DC D C 2 MHz 2 0 MHz 0 5 div 1 div 0 1 Vp p 0 2 Vp p A C 10 H z 2 MHz 2 0 MHz 0 5 div 1 div 0 1 Vp p 0 2 Vp p TV H V 2 div 0 4 Vp p CALIBRATION VOLTAGE Square wave positive polarity 1 Vp p 3 1 kHz 3 POWER REQUIREMENTS Power Supply Voltage A C 100 120 220 240 V 1 0 50 60 Hz Power Consumption Approx 22 W at 100 V AC DIMENSIONS AND WEIGHT Dimen...

Page 7: ...ne fuse EQUIPMENT PROTECTION 1 Never allow a small spot of high brilliance to remain stationary on the screen for more than a few seconds The screen may become permanently burned A spot will occur only when the scope is set up for X Y operation and no signal is applied Either reduce the intensity so the spot is barely visible switch back to normal sweep operation when no signal is applied or set u...

Page 8: ...er a probe from a different scope is used See page 20 8 In X Y operation do not pull out the PULL x 5 MAG switch If pulled out it noise may appeare on the waveform Plug configuration Power cord and plug type Factory installed instrument fuse Line cord plug fuse North American 120 volt 60 Hz Rated 15 amp 12 amp max NEC 0 5 A 250 V Fast blow AGC 3AG None Universal Europe 220 volt 50 Hz Rated 16 amp ...

Page 9: ...at 1 V with positive polarity 0 POSITION PULL x 5 MAG Rotation adjusts the vertical position of channel 1 trace on the display Pulling this knob increases the vertical axis sensitivity 5 times VOLTS DIV Sets the vertical axis sensitivity using the vertical attenuator for channel 1 This knob can be switched in a 1 2 5 sequence Setting the VARIABLE knob 6 to the C A L posi tion provides calibrated v...

Page 10: ... coupled and DC component is blocked GND Input signal and vertical amplifier are separated and input to vertical amplifier is grounded This allows for confirmation of the ground potential DC Input signal is DC coupled allowing for measurement including DC component This lever servers as the X axis or Y axis input selector during X Y operation CH1 INPUT Vertical axis input jack for channel 1 Serves...

Page 11: ...nel 1 input signal is displayed on the CRT Channel 1 is the Y axis if this mode is selected during X Y operation CH2 Channel 2 input signal is displayed on the CRT Channel 2 is the Y axis if this mode is selected during X Y operation ALT Channel 1 and channel 2 signals are displayed alternately on the C R T with each sweep CHOP Channel 1 and 2 signals are displayed alternately on the C R T at a re...

Page 12: ...ggered sweep operation Unlike AUTO no sweep appears when the proper trigger signal is not applied NORM LINE TRIG SOURCE Select the trigger source sync signal source The following trigger sources can be selected When NORM is selected with the switch switch selects either internal triggering _ _ INT or external triggering E X T INT Internal triggering is selected and the sweep is triggered by the si...

Page 13: ...rovides fine adjustment of sweep time continuous adjustment is possible between steps selected by SWEEP TIME DIV Sweep time is calibrated by in the extreme clock wise CAL position 25 SWEEP TIME DIV Sweep time coarse selector Selects sweep times between 0 2 ts div and 1 s div in 21 steps Indicated values are calibrated when SWEEP VARIABLE control is set to CAL position fully clockwise Oscilloscope ...

Page 14: ...IG Jack Input terminal for external trigger signal When the TRIG SOURCE control is set to NORM and is set to EXT the signal input to this terminal becomes the trigger signal Fuse Holder Contains the line fuse Verify that the proper fuse is installed when replacing the line fuse 100 V to 120 V 0 5A 200 V to 240 V 0 3A 14 ...

Page 15: ...BOTTOM PANEL Fig 4 T R A C E ROTATION Electrically rotates trace to horizontal position Adjust when strong magnetic fields cause the trace to be tilted FOCUS Adjusts the trace for optimum focus 15 ...

Page 16: ...INTENSITY and if necessary the FOCUS fj for ease of observation 3 Vertical Modes Apply an input signal to the CH1 INPUT jack and adjust the VOLTS DIV control for a suitable size display of the waveform If the waveform does not appear in the display adjust the VOLTS DIV and y POSITION controls to bring the waveform into the center portion of the C R T display Operation with a signal applied to the ...

Page 17: ...r circuit to cause the trigger signal triggered with the input signal to drive the sweep When the V or Y MODE selection is in A L T the A L T position is very convenient for meas uring the time duration of the waveform However for phase or timing comparisons be tween the channel 1 and channel 2 waveforms both traces must be triggered by the same sync signal When the SOURCE selection is in NORM and...

Page 18: ...E jj selection is in AUTO the sweep circuit becomes free running as long as there is no trigger signal permitting a check of GND level When a trigger sig nal is present the trigger point can be determined by the LEVEL control for observation as in the normal trigger signal When the trigger level exceeds the limit the trigger circuit also becomes free running where the waveform starts running When ...

Page 19: ...SWEEP TIME DIV control to the X Y position 2 Use the channel 1 probe for the vertical input and the channel 2 probe for the horizon tal input 3 Adjust the amount of horizontal deflection with the C H 2 VOLTS DIV and VARIABLE controls 4 The CH2 vertical POSITION control now serves as the horizontal position control and the POSITION control is disabled 5 All sync controls are disconnected and have n...

Page 20: ... a horizontal trace position can be the cause of measurement errors Adjust the controls for a single display Set the AC GND DC switch to GND and TRIG MODE to AUTO Adjust the y POSITION control such that the trace is over the center horizon tal graticule line If the trace appears to be rotated from horizontal align it with the center graticule line using the T R A C E ROTATION control located on th...

Page 21: ...screen 5 Measure the vertical distance from the reference level to the point to be measured the reference level can be rechecked by setting the AC GND DC switch again to GND Multiply the distance measured above by the VOLTS DIV setting and the probe attenu ation ratio as well Voltages above and below the reference level are positive and nega tive values respectively Using the formula DC level Vert...

Page 22: ...nd point to coincide with the center vertical graduation line 4 Measure the vertical distance between the two points and multiply this by the setting of the VOLTS DIV control If a probe is used further multiply this by the attenuation ratio Using the formula Volts Peak to Peak Vertical distance div x VOLTS DIV setting x probe attenuation ratio EXAMPLE For the example the two points are separated b...

Page 23: ...t the V or Y MODE to CHOP and SOURCE to CH2 Verify that CH2 represents the unwanted signal in reverse polarity If necessary reverse polarity by setting CH2 to INV 3 Set the V or Y MODE to ADD and CH2 VOLTS DIV and VARIABLE so that the undesired signal component is cancelled as much as possible The remaining signal should be the signal you wish to observe alone and free of the unwanted signal Signa...

Page 24: ...Multiply this by the setting of the SWEEP TIME DIV control to obtain the time between the two points If horizontal x 5 MAG is used multiply this further by 1 5 Using the formula Time Horizontal distance div x SWEEP TIME DIV setting x x 5 M A G value 1 1 5 Fig 12 Adjust to horizontal center line with POSITION EXAMPLE For the example the horizontal distance between the two points is 5 4 divisions If...

Page 25: ...een a chosen set of vertical graduation lines Using the horizontal distance between the vertical lines used above and the SWEEP TIME DIV the time span may be calculated Multiply the reciprocal of this value by the number of cycles present in the given time span If x 5 M A G is used multiply this further by 5 Note that errors will occur for displays having only a few cycles EXAMPLE For the example ...

Page 26: ...the oscilloscope is clipped and the signal level must be reduced 3 Connect the channel 2 probe to the output of the test circuit 4 Select X Y operation by rotating the SWEEP TIME DIV control clockwise to the X Y position 5 Connect the channel 1 probe to the input of the test circuit The input and output test connections to the vertical and horizontal oscilloscope in puts may be reserved 6 Adjust t...

Page 27: ...high voltage used inside this unit Never open the case REPLACEMENT OF FUSES This oscilloscope will not function if the fuse has blown If the fuse blows determine the cause and contact your dealer if the cause lies in this equipment If the cause was external to this equipment remove the cause detach the fuse holder from the rear panel using a flatblade screwdriver and insert a new fuse 27 Rear Pane...

Page 28: ...nd allow the unit to warmup sufficiently before adjustment 4 For any adjustment requiring measurement instruments leave the unit in its current state and contact your dealer This unit has a total of eight trimmers see diagram below which can be externally adjusted If misadjustment occurs during use adjust according to the procedures outlined below Use plastic tipped screwdrivers for adjustment and...

Page 29: ...form The STEP BAL and DC BAL adjustment begin with STEP BAL adjustment due to the cir cuit design STEP BAL Set the selector to the GND position and adjust for CH1 and CH2 so that the trace does not move when the VOLTS DIV knob is switched between the 1 2 and 5 ranges DC BAL In the same manner as S E T BAL adjust for CH1 and CH2 so that the trace does not move VARIABLE knob is rotated from the righ...

Page 30: ...MEMO 30 ...

Page 31: ...MEMO 31 ...

Page 32: ...A product of KENWOOD CORPORATION 17 5 2 chome Shibuya Shibuya ku Tokyo 150 Japan ...

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