Kenwood AG-203, Instruction Manual

Page 1: ...A G 2 D 3 CR Oscillator INSTRUCTION MANUAL ...

Page 2: ...ions 4 C i r c u i t Description 6 Panel Controls and T h e i r F u n c t i o n s 8 Operating Instructions 10 Applications 12 Maintenance 15 A d j u s t m e n t 16 Caution 17 Parts L i s t 18 P C B o a r d 21 S c h e m a t i c Diagram 2 2 ...

Page 3: ...ibrated w i t h single scale graduations for frequency range of 1 0 H z to 1 M H z selectable in 5 ranges High output design more than 7 V rms at no load and more than 3 5 V rms at 6 0 0 n O u t p u t level is fully adjustable w i t h a 10dB step 6 range attenuator and a level adjuster L o w output impedance of 6 0 0 a T h e attenuator provides accuracy of 1 0dB at 8 0 0 o load Sine and square wav...

Page 4: ...or less 2 0 H z 5 0 0 k H z 1 or less 1 0 H z 1 M H z 1 5 or less Output voltage no load 1 0 V p p or more Sag 5 or less at 5 0 H z Rise and fall times 2 0 0 n s or Iess Overshoot 2 or less at 1 k H z m a x output D u t y ratio 5 0 5 at 1 k H z m a x output S y n c h r o n i z i n g range 1 V S ta allowable Input 1 0 V rms lta e input Itnpedanee A p p r o x 1 0 k o O u t p u t impedance BOOo 1 0 O...

Page 5: ...eight 2 9 kg Accessories Power cord 1 O u t p u t c o r d one red and black test cord w i t h basket clip and banana plug Banana plug red 1 and black 1 F u s e 0 1 2 5 A 2 and 0 2 A 2 Instruction manual 1 ...

Page 6: ... E N C Y dial These elements provide means t o v a r y t h e oscillating frequency continuously over 10 times its f r e q u e n c y on one range thus determining a n y desired frequency w i t h i n t h e entire f r e q u e n c y range f r o m 1 0 H z t o 1 M H z T h e amplifier circuit f o r t h e oscillator circuit is put ge e f i p i o n g D Q pl c jj IL f h Uir sf 3ge s a high i p u hrije ar r ...

Page 7: ...ion accuracy is as high as 1 OdB at a 8 0 0 o load 6 Power SuppSy T h e power supply circuit is powered by A C 1 0 0 V 1 2 0 V or 2 2 0 V and delivers D C 2 2 V s u f f i c i e n t l y stabilized by large capacity smoothing capacitors 2 2 0 0 M F x 2 and a voltage stabilizer Wien bridge oscillator circuit E X T S Y N C Square wave shaping circuit Output level control D C 2 2 V D C 2 2 V Power supp...

Page 8: ... t p u t signal is sine wave When pressed to T L the signal is square w a v e 6 F R E Q R A N G E Oscillating frequency range selector s w i t c h w h i c h selects the ranges in 5 steps as f o l l o w s x 1 1 0 H z 1 0 0 H z x 10 1 0 0 H z 1 k H z x 1 0 0 1 k H z 1 0 k H z x 1k 1 0 k H z 1 0 0 k H z x 10k 1 0 0 k H z 1 M H z 7 A M P L I T U D E A m p l i t u d e adjuster to continuously vary the ...

Page 9: ...o A G 2 0 3 12 F U S E Fuse for power supply 13 A C C O N N E C T O R For connection of the supplied A C connector 14 P O W E R V O L T A G E S E L E C T O R T h i s selector is preset to 2 4 0 V position A C power of 1 0 0 V 1 2 0 V or 2 2 0 V m a y be used by changing the position of the selector Front panel Rear panel FIG 2 ...

Page 10: ... Output Voltage T h e o u t p u t voltage f r o m O U T P U T terminal 4 be it sine w a v e or square w a v e can be continuously varied by A M P L I T U D E 7 and stepped d o w n by A T T E N U A T O R 3 E x a m p l e T o adjust o u t p u t voltage to 1 0 m V rms proceed as f o l l o w s 1 C o n n e c t a voltmeter capable of meas uring A C 1 V rms to O U T P U T terminal 4 2 Set A T T E N U A T ...

Page 11: ...iated f r o m t h e frequency of A G 2 0 3 the synchronization is pulled o u t w h i c h affects t h e distor tion factor It is therefore advisable that the oscillating frequency be first synchronized w i t h a l o w input signal voltage less than 1 V rms a n d then the voltage be increased F i g 3 11 Oscillating frequency deviation Output level dB Distortion factor Synchronizing range Lxternal sy...

Page 12: ...onnecting a high sensitivity volt meter If A T T E N U A T O R 3 is set to OdB and the voltmeter indicates 2 V it means that the input voltage of the amplifier is 5 0 d B below 2V T h e r e fore the gain obtained is as f o l l o w s 5 0 d B 2 0 og10 L d B 5 Q d B 6 d B 4 4 d B 3 Measurement of Phase Characteristic Connect A G 2 0 3 and an oscilloscope to the amplifier to be tested as s h o w n in ...

Page 13: ...lows First measure the m a x i m u m horizontal deflection and suppose that this deflection is X and that the section at w h i c h the ellipse crosses the horizontal axis is x as shown in F i g 6 A n d the phase shift angle e is given by the following Find e f r o m the table of trigonometric functions and the value obtained gives the angle of phase shift 4 Using as Square Wave Oscillator A G 2 0 ...

Page 14: ...onship between w a v e f o r m s a n d amplifier characteristics is shown in F i g 8 A G 2 0 3 O U T P U T Amplifier under test Oscilloscope F i g 7 Output Waveform Amplifier Characteristic _n_n_ Flat frequency character istic over 10 times the input frequency A F r e q u e n c y of about 10 times the input frequency is cut off Frequency of about 1 10 of the input frequency is cut off Peak appears...

Page 15: ... g 9 2 Mounting the Case Place the case so that the underside of it is left open a little Tighten 6 screws u n i f o r m l y Do not use exces sive force w h e n tightening as it will damage the screws and the vinyl leather on the case 3 Replacement of Fuse Open the fuse holder w i t h a Phillips head screwdriver Replace the fuse w i t h one having the same rating Case fixing screws 6 in total F i ...

Page 16: ...al 3 Set F R E Q R A N G E switch 6 to X 1 0 0 and adjust the shaft of the dial until the frequency counter in dicates 1 k H z 4 Set the dial to 1 0 position and tighten the set screws making sure that the shaft stays as it is C h e c k that the frequency counter is indicating 1 k H z then secure the knob to the dial 5 Set the dial to 1 0 0 position and adjust T C 1 0 1 for a reading of 1 0 k H z ...

Page 17: ... will appear at O U T P U T terminal for a w h i l e w h e n the p o w e r is o n T h i s D C voltage will disappear about 2 0 to 3 0 seconds later w h e n normal output w a v e f o r m is obtained 5 Output voltage variation due to ambient temperature A thermistor is used to control the oscillating voltage Care should be used w h e n operating A G 2 0 3 in at mosphere of excessive temperature vari...

Page 18: ... No Part No Description E 1 8 0 1 0 6 0 5 7erminal type banana E l 8 0 1 0 7 0 5 Terminal type banana black _ E 2 1 0 2 0 3 1 3 Pair terminal E 3 0 0 0 9 5 0 5 Cord Black _ E 3 0 0 C 9 6 0 5 Cord Red E 9 1 0 0 0 3 0 5 Mini gator clip with black insulator _ E 9 1 0 0 0 4 0 5 Mini gator dip with red insulator _ E 9 1 0 0 1 8 05 B a n a n a tip Slack I E 9 1 0 0 1 5 0 5 B a n a n a tip Red F 0 5 2 0 ...

Page 19: ...1 4W a t 13 R D 1 4 B B 2 E 121J C a r b o n 120a 6 1 4W R 4 B D 1 4 B B 2 E t a 3 J C a r b o n I S k f t 5 1 4 W fiD14BB2 102J Ca borr l O k a 0 1 4W r r e S D 1 4 B B 2 E 5 0 U C a r b o n 5 1 4 W 1 1 8 R P 1 B B 2 E CO Care Dr 4 a 5 1 4W R 1 V R D U B B 2 E r i O J C a r b o n 8 2 H 5 1 4W R 1 2 C r D 1 4 S B 2 F 0 8 2 J C a r b c n S S k f t 5 i im R 2 1 1 2 2 R D 1 4 B B 2 E 4 7 0 J Cat bo n...

Page 20: ... 1 2 0 0 5 6 0 5 Semi fixed resistor 100QB T C 1 0 1 1 0 2 C 0 5 0 4 1 5 0 5 Trimmer 15pF C 1 0 1 a e S 4 2 5 5 0 1 0 5 Push switch S 1 0 2 a b S 4 2 2 5 0 1 0 5 Push switch S 2 0 1 a b S 0 1 2 5 0 2 0 5 Rotary Switch Ref No Parts No Description R 2 0 1 R N 1 4 B K 2 H 5 9 0 0 F Metal 59012 R 2 0 2 2 0 3 R N 1 4 B K 2 H 3 1 6 0 F Metal 31612 R 2 0 4 R N 1 4 B K 2 H 4 2 2 0 F Metal 42212 R 2 0 5 2 ...

Page 21: ...P C Board ...

Page 22: ...nge for improvement Q101 102 2SK381 D 0103 104 2SA838CC Qi65 iio i i 2SC 1845 Q106 2SA992 G107 2SC495 YJ Qios 2SA505 Y 0I09 2SC2274 D E 0i 12 2SD882 Q113 2SB772 D101 1 0 4 MS 1588 Di05 i06 MTZ24JC Di07 W 02 THlOi STT 300H AG 2 0 3 Schematic Diagram ...

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Page 24: ...A product of KENWOOD CORPORATION 1 7 5 2 c h o m e Shibuya Shibuya ku Tokyo 1 5 0 J a p a n 96009 P R I N T E D IN J A P A N B 5 0 2 8 1 8 1 0 K ...