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20MHz Dual Trace Oscilloscope

MODEL: 72-6800

8272-68000MC1

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Summary of Contents for 72-6800

Page 1: ...20MHz Dual Trace Oscilloscope MODEL 72 6800 8272 68000MC1 ...

Page 2: ...nsity 3 6 Withstanding Voltage of Input Terminals 5 5 6 6 6 6 4 OPERATION METHOD 4 1 Introduction of Front Panel 4 2 Introduction of Rear Panel 4 3 Basic Operation Single channel operation 4 4 Dual channel Operation 4 5 ADD Operation 4 6 Triggering 4 7 TIME DIV control 4 8 Sweep Magnification 4 9 X Y Operation 4 10 Calibration of Probe 4 11 DC BAL Adjustments 8 9 12 13 14 16 16 18 19 20 21 21 5 MA...

Page 3: ...y condition or practices that Could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property The following symbols may appear in this manual or on the product DANGER ATTENTION Protective Earth ground High Voltage refer to Manual Conductor Terminal Terminal ...

Page 4: ...3 ...

Page 5: ...ected to the terminal marked with the the following code letter L or P or coloured Brown or Red Green If in doubt consult the instructions provided with the equipment or contact the supplier Yellow Earth Blue Neutral This cable appliance should be protected by a suitably rated and approved HBC mains Brown Live Phase fuse refer to the rating information on the equipment and or user instructions for...

Page 6: ...ensitivity In addition to wide bandwidth DC 20MHz 3dB this instrument provides high sensitivity of 5mV DIV 1mV DIV at 5 MAG A 20MHz frequency is obtained with improved triggering synchronization 3 Alternate triggering Even an observation of two waveforms of different frequencies the waveforms of the each channel is stably triggered 4 TV sync triggering The oscilloscope has a sync separator circuit...

Page 7: ...2 ...

Page 8: ...plitude change when waveform of 2 DIV at graticule center is moved vertically Vertical modes CH1 CH1 single channel CH2 CH2 single channel DUAL CH1 and CH2 are displayed ALT or CHOP selectable at any sweep rate ADD CH1 CH2 algebraic addition Chopping repetition frequency Approx 250kHz Input coupling AC GND DC Maximum input voltage 300Vpeak AC frequency 1kHz or lower When set probe switch at 1 1 th...

Page 9: ...played TV V This setting is used when observing the entire vertical picture of television signal TV H This setting is used when observing the entire horizontal picture of television signal Both TV V and TV H synchronize only when the synchronizing signal is negative TRIGGERING EXT triggering signal input Input impedance Max input voltage Approx 1M ohm approx 25Pf 300V DC AC peak AC Frequency not h...

Page 10: ...m input voltage 30V DC AC peak AC frequency 1kHz Waveform Positive going square wave Frequency Approx 1 kHz Duty ratio Within 48 52 Output voltage 2 Vp p 2 CALIBRATION VOLTAGE Outputimpedance Approx 1 kohm Type 6 inch rectangular type internal graticule Acceleration voltage Approx 2kV Effective screen size 8 x 10 DIV 1 DIV 10mm 0 39in Graticule Internal CRT Trace Rotation Provided ...

Page 11: ... Power consumption Approx 40VA 35W max Ambient temperature Probes 2 To satisfy specifications 10 to 35 50 to 95 F Maximum operating ranges 0 to 40 32 to 104 F Relative humidity 85 RH max non condensing Installation Category II Pollution degree 2 Mechanical Specifications Storage Temperature Humidity Dimensions 310 W x 150 H x 455 D mm 10 to 70 70 RH maximum Weight Approx 8kg 17 6lbs ...

Page 12: ...shown in the table below by inserting the line voltage selector plug in the corresponding position on the rear panel Before connecting the power plug to an AC line outlet make sure the voltage selector is set to the correct position corresponding to the line voltage Note the oscilloscope may be damaged if it is connected to the wrong AC line voltage WARNING To avoid electrical shock the power cord...

Page 13: ...ty To prevent permanent damage to the CRT phosphor do not make the CRT trace excessively bright or leave the spot stationary for an unreasonable long time 3 6 Withstanding Voltages of Input Terminals The withstanding voltages of the instrument input terminals and probe input terminals are as shown in the following table Do not apply voltage higher than these limits When set probe switch at 1 1 the...

Page 14: ...ch is superimposed on a DC voltage is applied the maximum peak value of CH1and CH2 input voltages must not exceed or 300V so for AC voltages with a mean value of zero volt the maximum peak to peak value is 600Vpp Figure 4 1 ...

Page 15: ...10 Figure 4 2 ...

Page 16: ... with graticule lines FILTER 33 Filter for ease of waveform viewing Vertical Axis CH1 X input 8 Vertical input terminal of CH1 When in X Y operation X axis input terminal CH 2 Y input 20 Vertical input terminal of CH2 When in X Y operation Y axis input terminal AC GND DC 10 18 Switch for selecting connection mode between input signal and vertical amplifier AC AC coupling GND Vertical amplifier inp...

Page 17: ... as a dual channel instrument both CH1 and CH2 ADD The oscilloscope displays the algebraic sum CH1 CH2 or difference CH1 CH2 of the two signals The pushed in state of CH2 INV 16 button is for the difference CH1 CH2 ALT CHOP 12 When this switch is released in the dual trace mode the channel 1 and channel 2 inputs are alternately displayed normally used at faster sweep speeds When this switch is eng...

Page 18: ... SLOPE 26 Select the triggering slope Triggering occurs when the triggering signal crosses the triggering level in positive going direction Triggering occurs when the triggering signal crosses the triggering level in positive going direction LEVEL 28 To display a synchronized stationary waveform and set a start point for the waveform Toward The triggering level moves upward on the display waveform...

Page 19: ... varied continuously when shaft is out of CAL position Then the control is rotated in the direction of arrow to the full the CAL state is produced and the sweep time is calibrated to the value indicated by TIME DIV Counterclockwise rotation the full delays the sweep by 2 5 time or more 34POSITION 32 Horizontal positioning control of the trace or spot 10 MAG 31 When the button is pushed in a magnif...

Page 20: ...put terminal for external intensity modulation signal CH1 SIGNAL OUTPUT 35 Delivers the CH1 signal with a voltage of approximately 20mVper 1 DIV into a 50 ohm termination Suitable for frequency counting etc ...

Page 21: ... make sure that the AC line voltage input switch on the rear panel of the instrument is correctly set for the AC line voltage After ensuring the voltage setting set the switches and controls of the instrument as shown below Item No Setting Item No Setting POWER 6 Disengage position OFF SLOPE 26 INTEN 2 Mid position TRIG ALT 27 Released FOCUS 3 Mid position TRIGGER MODE 25 AUTO VERT MODE 14 CH1 TIM...

Page 22: ...apply the 2Vp p CALIBRATOR signal to the probe tip 5 6 7 8 Set the AC GND DC switch to the AC state A waveform as shown in the figure4 3 will be displayed on the CRT screen Adjust the FOCUS control so that the trace image appears sharply For signal viewing set the VOLTS DIV switch and TIME DIV switch in appropriate positions so that signal waveform is displayed clearly Adjust the 56 POSITION and 3...

Page 23: ...ignals applied respectively to CH1and CH2 appears on the screen alternately at each sweep This setting is used when the sweep time is short in 2 channel observation When ALT CHOP switch is engaged CHOP MODE the input signals applied to CH1and CH2 are switched at about 250kHz independent of the sweep and at the same time appear on the screen This setting is used when the sweep time is long in 2 cha...

Page 24: ...er source signal is present The AUTO position is handy when first setting up the scope to observe a waveform it provides sweep for waveform observation until other controls can properly set Once the controls are set operation is often switvhed back to the NORM triggering mode since it is more sensitive Automatic sweep must be used for DC measurements and signals of such low amplitude that they wil...

Page 25: ...plied to the trigger circuit to display a stationary signal on the CRT screen The SOURCE switch is used for selecting such a triggering sources CH1 The internal trigger method which is used most commonly CH2 The signal applied to the vertical input terminal is branched off from the preamplifier and is fed to the trigger circuit through the VERT MODE switch Since the triggering signal is the measur...

Page 26: ...h has a periodic relationship with respect to the measured signal is used Since the measured signal is not used as the triggering signal the waveforms can be displayed more independent than the measured signal ...

Page 27: ...osition up the sweep is developed form the trigger source waveform as it crosses the threshold level in a positive going direction When the TRIG SLOPE control is set to the to the position down a sweep trigger is developed from the trigger source waveform as it crosses the threshold level in a negative going direction This switch selects the slope polarity triggering signal as shown in Figure 4 6 ...

Page 28: ... displayed which may appear as a straight line for a Square wave or Pulse waveform 4 8 Sweep Magnification When a certain part of the displayed waveform is needed to be expanded timewise a faster sweep speed may be used However if the required portion is apart from the starting point of the sweep the required portion may run off the CRT screen In such a case push in the 10MAG button When this has ...

Page 29: ... voltages such as a vectorscope display of video color bar patterns However the X Y mode can be used to graph almost any dynamic characteristic if a transducer is used to change the characteristic frequency temperature velocity etc into a voltage One common application is frequency response measurements where the Y axis corresponds to signal amplitude and the X axis corresponds to frequency 1 Set ...

Page 30: ...at 50mV Connect the probe tip to the calibration voltage output terminal and adjust the compensation trimmer on probe for optimum square wave minimum overshoot rounding off and tilt Figure 4 9 a Correct compensation b Over compensation c Insufficient compensation 4 11 DC BAL Adjustments The ATT balance of the vertical axis can be made easily 1 Set the input coupling switches of CH1 and CH2 to GND ...

Page 31: ... Conversion The primary winding of the power transformer is tapped to permit operation from 115V or 230VAC 50 60Hz line voltage Conversion from one line voltage to another is done by changing the line voltage selector switch as shown in Fig 4 2 The rear panel identifies the line voltage to which the unit was factory set To convert to a different line voltage perform the following procedure 1 Make ...

Page 32: ...27 Do not use abrasive cleaners on any portion of the oscilloscope ...

Page 33: ...28 6 BLOCK DIAGRAM ...

Page 34: ...29 ...

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