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Trio CO-1303A Instruction Manual

75 mm oscilloscope
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75 m m OSCI L LOSCOPE
C O
1 3 0 3 A
INSTRUCTION MANUAL
TRIO

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Summary of Contents for Trio CO-1303A

  • Page 1 75 m m OSCI L LOSCOPE 1 3 0 3 A INSTRUCTION MANUAL TRIO...

  • Page 2: Table Of Contents

    1 3 0 3 A C O N T E N T S Page Features Specifications Circuit Description Operating Instructions Applications Caution on Handling the Scope Adjustment Maintenance Block Diagram, Schematic Diagram & Drawing of E x t e r n a l V i e w...

  • Page 3: Features

    FEATURES F E A T U R E S T h e T R I O C O - 1 3 0 3 A Oscilloscope is a highly sensitive and stable oscilloscope employing a 7 5 m m cathode ray tube. Its unique design enables easy operation. Make the most of the oscilloscope by carefully reading this instruction manual.

  • Page 4: Specifications

    SPECIFICATIONS S P E C I F I C A T I O N S C A T H O D E R A Y T U B E C 3 0 8 P 1 V E R T I C A L A M P L I F I E R Deflection sensitivity 2 0 m V / c m or better Frequency response...
  • Page 5 SPECIFICATIONS D I R E C T D E F L E C T I O N T E R M I N A L S Deflection sensitivity 2 5 V / c m or better Input impedance 2.2 M f i shunted by 2 5 p F or less P O W E R R E Q U I R E M E N T A C 2 2 0 ~ 2 4 0 V ( 2 3 0 V ) 5 0 / 6 0 H z , 15 W max.

  • Page 6: Circuit Description

    CIRCUIT DESCRIPTION C I R C U I T D E S C R I P T I O N Refer to B L O C K D I A G R A M and S C H E M A T I C D I A G R A M Vertical Circuit T h e input signal connected to V E R T I N P U T terminal is applied to an attenuator through the A C - D C switch.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS O P E R A T I N G I N S T R U C T I O N S T h e markings of controls and terminals on the front panel are given in the following table. When reading the table, refer t o the attached E X T E R N A L V I E W .
  • Page 8 OPERATING INSTRUCTIONS D E S C R I P T I O N R E F . N O . P A N E L M A R K I N G ( 7 ) ( 7 ) ( 7 ) V .
  • Page 9 OPERATING INSTRUCTIONS R E F . N O . P A N E L M A R K I N G D E S C R I P T I O N Sweep-frequency selector switch, together w i t h S W E E P S W E E P R A N G E (11) V A R I / E X T .
  • Page 10 OPERATING INSTRUCTIONS ( B O T T O M P A N E L ) R E F . N O . P A N E L M A R K I N G D E S C R I P T I O N DC balance adjustment for the vertical amplifier.
  • Page 11 OPERATING INSTRUCTIONS R E F . N O . P A N E L M A R K I N G D E S C R I P T I O N (21) D I R - N O R S w i t c h for the vertical deflection plates.
  • Page 12 OPERATING INSTRUCTIONS Time-base and signal frequencies are equal. Time-base frequency is 1/5 of signal frequency. Fig. 1 Relationship between signal and time base frequencies Position the waveform by adjusting the vertical position control (9) and horizontal position control (10) appropriately. If the waveform includes a D C component, it is shifted up or down depending on the polarity of the component.
  • Page 13 OPERATING INSTRUCTIONS Effective Waveform Value (r m s) 2 ^ = 0 . 3 5 4 A = 0 . 5 A ~7f = 0 . 7 0 7 A Effective Waveform Value (r m s) 2 ^ 3 = 0 . 2 8 8 A = 0 .
  • Page 14 OPERATING INSTRUCTIONS M E A S U R E M E N T B Y L I S S A J O U S ' F I G U R E S Frequency measurement Lissajous' figures are a widely used method for measurement of the frequency of a signal. T o make a frequency measurement using this method, proceed as follows: Set the S W E E P R A N G E selector switch (11) to the E X T position.
  • Page 15 OPERATING INSTRUCTIONS Measurement of phase difference A p p l y the t w o signals having the same frequency (for instance the R and L signals of a stereo signal) to H O R E X T . I N P U T (3) and V E R T I N P U T terminals (5) in the same manner as described irr (a). A straight line running from the upper left corner t o the lower right corner of the screen indicates both signals are in phase w i t h each other.

  • Page 16: Applications

    APPLICATIONS A P P L I C A T I O N S Frequency Response Measurement of an Audio Amplifier Connect the sine wave output of a signal generator to the input terminal of the audio amplifier under measurement. Connect the V E R T I N P U T (5) and ^=- (4) terminals of the oscilloscope across the speaker output terminals of the amplifier.
  • Page 17 APPLICATIONS Frequency response of amplifier Square wave output I KHz Gain reduced at high-frequency Gain rises at high-frequency Gain reduced at low-frequency Gain rises at low-frequency With loudness control set ON. Gain having waving characteristic curve Measurements through the Direct Deflection T e r m i n a l s Although frequencies below 1.5 MHz can be measured through the internal amplifier,...
  • Page 18 APPLICATIONS T h e direct deflection terminals, however, require an input level of 2 5 Vp-p t o 100 V p - p because of their low sensitivity. Also, since the direct connection to the deflection plate puts the sensitivity control out of the circuit, adjustment must be made on the source side of the set-up.
  • Page 19 APPLICATIONS Ideal keying waveform Waveform with cliks at keydown Waveform of soft tone Waveform with mal-regulation of power source Fig. 10 An example of Morse code envelopes Observation of S S B waveforms Make connections referring t o the Fig. 8. Connect the output of a two-tone generator (for example, 5 0 0 H z and 1500 H z ) to the microphone input jack of the S S B transmitter to observe modulation.

  • Page 20: Caution On Handling The Scope

    CAUTION ON HANDLING THE SCOPE C A U T I O N O N H A N D L I N G T H E S C O P E D o not operate this oscilloscope in a place where the set is exposed to direct sunlight. Otherwise, the unit may reach a high internal temperature w i t h resultant unstable operation a n d , in some cases, result in damaged components.

  • Page 21: Adjustment

    ADJUSTMENT A D J U S T M E N T Adjustment of D.C. B A L When the trace line is moved up or down as the V . G A I N control (8) is turned, adjust the D.C. B A L adjustment as follows.
  • Page 22 ADJUSTMENT Length of Larger Smaller horizontal H. G A I N H. GAIN deflection Fig. 12 Adjustment of HOR G A I N Adjustment of V . A T T Frequency. Correction Remove the cabinet case from the unit. C A U T I O N : T h e cathode ray tube socket pins carry voltage of approx. - 1 2 0 0 V . B E C A R E F U L not to bring the hand or screwdriver into contact w i t h the metal section of the socket while making these adjustments.
  • Page 23 ADJUSTMENT Ideal waveform Waveform for large trimmer capacitor Overshoot (%) = b/a x 100 Waveform for small trimmer capacitor Vertical frequency response at high-frequencies (For example, it becomes 900kHz-3dB.) Fig. 14 Square wave characteristic adjustment by trimmer capacitor Correction of Cathode R a y T u b e Position for T i l t Remove the cabinet case.
  • Page 24 ADJUSTMENT Tighten the clamping screws for the cathode ray tube uniformly while checking that the trace line is kept level on the center horizontal axis of the scale. Band for C . R . T . Clamping screws for C.R.T. Installing screws for C.R.T.

  • Page 25: Maintenance

    MAINTENANCE M A I N T E N A N C E Removal of Cabinet Case (2) Loosen these screws several turns /(3) Turn the cabinet case about (1) Remove these setscrews this screw. Fig. 16 How to remove the case Remove four setscrews for the cabinet case from both side plates.
  • Page 26 MAINTENANCE Removal of Panel Remove the cabinet case. Loosen mounting screws for control knobs (2 large knobs, 3 small knobs and 1 red knob). Unscrew the nut f r o m the S W E E P R A N G E selector switch shaft. Remove the black screw between terminals (3) and - i - ( 4 ) .
  • Page 27 MAINTENANCE Replacement of Fuse A l w a y s disconnect power supply before replacing a fuse Remove the cabinet case from the unit. Remove the fuse inserted in its holder located on the upper right corner of printed circuit board and insert a new fuse in the fuse holder.
  • Page 28 CO-I303A Note: Resistor w i t h no specified value are those of 1/4 W and ±5%. A l s o , the circuit elements may be changed w i t h o u t notice owing to a technical innovation. T h e source voltage is set for 2 3 0 V A C and the fuse is 0.3 A in this schematic diagram.
  • Page 29 B L O C K D I A G R A M of CO-1303A BOTTOM P A N E L R E A R P A N E L F R O N T P A N E L E X T E R N A L V I E W of CO-1303A...

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