Weston 686 TYPE 10A Instructions Manual Download Page 5 | Manualshive

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Summary of Contents for 686 TYPE 10A

Page 1: ...NSTRUCTIONS FOR II WESTON MODEL 686 TYPElOA True Mutual Conductance Vacuum Tube Analyzer j II WESTON ELECTRICALINSTRUMENT CORPORATION NEWARK5 NEW JERSEY U S A 2551 3 54 Pri ted in U S A 1 II 1 1 II II II Ii ...

Page 2: ...m___3 Grid Current __ 00__m__ um m__m ________00_3 Heater Voltage mmmmm_m_mmm m_mm__mm_h__4 Operation Line Connections for 230 Voltsm___un__m__m_m m_6 Step By Step Test Procedure__um__mm_un_m6 7 8 9 Theory of Operation_m_mm_m mumumm_ 9 10 CONTENTS PAGE Order of Adjustment of Element Potentiometersmmm_5 Ordering Information _u__mm__mm mmm__m__m 11 Precautions __u__h__mm_mm_m_h mm_mm_umm m 11 Switch...

Page 3: ...1 o Ii Ii e Ii i D o 0 Front Panel View of Model 686 Type lOA 2 ...

Page 4: ...maller than the dc grid bias voltage to prevent direct grid conduction On tubes having sharply curved characteristics the grid signal should be kept small to avoid second order effects The low signal voltages available make it possible to measure all low bias tubes operated and tested as Class A amplifiers It is advisable for the operator to select the low est grid signal voltage that will render ...

Page 5: ...cuit is used on the rotary switch to automatically shift ranges on the filament voltmeter as the switch is rotated Thus the operator always has this meter on the correct range and the possibility of instrument overload is eliminated The particular range connected into the circuit is marked for each group of potentials on the Heater Voltage Selector switch plate The voltmeter connections are brough...

Page 6: ...be types such as the 6I4 6I6 and 1231 where self bias is definitely speci fied by the manufacturer These tubes tend to draw grid current or are unstable under equivalent fixed bias conditions thus causing errors in Gmreadings The control may be varied from 0 to 700 ohms and to prevent degeneration the unit is by passed by a 1 000 m f 50 volt condenser When checking the normal fixed bias types this...

Page 7: ... located just to the left of the name plate at the bottom of the panel to the NEG position To measure the negative potential rotate the Element Volts switch to the Neg Supp position LAMPTEST TOGGLE SWITCH Located to the left of the rotary Plate I Plate 2 switch this toggle provides a ready means for checking the neon lamp If a tube shows no short and there is some doubt as to the condition of the ...

Page 8: ...ay be used for subminiature tubes or low bias high mu tubes 17 Index Gill Range switch to a range consistent with the expected mutual conductance This is the value listed by the manufacturer 18 Index Element Current switch located below the Gill Factor toggle switch to the Plate position 19 Index Element Current Range switch located below the Element Current meter to a position higher than the exp...

Page 9: ...ed to the 3 position Note The 0 8 MA limit at 10 volts maximum is usually considered satisfactory however diodes normally pass considerably greater current some going as high as 2 or 3 MA CONVERTERAND MIXER OSCILLATOR TYPES 47 Patch the jumper leads in accordance with the information in Tube Data Chart supplied separately A The figure in parenthesis in the Tube Data Charts refers to the pin connec...

Page 10: ...age supply and the a c grid signal transformer The filament transformer control is located in the primary leads thus providing proper adjustment to take care of varying line voltage con ditions A rotary switch selects secondary taps to give the necessary heater voltages for all tubes The d c power supply delivers potentials to the plate screen and suppressor controls Following these controls the p...

Page 11: ...e is specified by the tube manufacturer the operator should be guided accordingly If it is not known what reduction in Gm is allow able the limits in percent of normal listed below are suggested as the proper end points for use in gen eral electronic equipment RF IF and Pentode Voltage Amplifiers 65 General Purpose and high mu Triodesm___50 Power Output Types m m 50 Converters and Mixers Refer to ...

Page 12: ...rying capacity Don t apply more than 10 volts to diode detectors or their emission may be lost Don t Fail to Bring Up the Grid Voltage First the Plate Voltage Second and the Screen Voltage Third otherwise the cathode or the screen may be damaged Don t fail to completely Shut Off the device when testing is completed MAINTENANCE RECTifiER TUBES Itis recommended that the several components in the dev...

Page 13: ... E ov ON Gm READING U9 ffi o 00 o L c 3 I ISO 21 300v L 60 0 2 j 6 3 2100 27 000 u ELEMENT o1 L VO L TAG E olQ RANGE 50 10 10 0 o ___Q _ o GRID 0 VOLTAGE GRID 0 22 1 RANGE d E _ 2 000 9 0 0000 o 0 0 _ 6 0 0 3 0 3278 I 1229 3MEG t __ 000 0000 o o I OV OFF 25 5V OV 15 Lj 2V O 5 0 Wl_ 0 IV 00 00 I I I 1 500 600 ON CALIBRATE L O OFF 150 3MEG HEATER VOLTAGE ADJUSTER 200 5J oXI Jf 2MFO Gm FAC OR 1 1 45 ...

Page 14: ...J V r OOOOOOOO 1 V I J 1 i J 1 I 2 3 4 5 6 7 8 9 I I I I I I __I I I 00 o 0 r O O 000 1229 4g I b 2J b 012 o L o L 10 0 c HEATER VOLTAGE SELECTO 115 o ELEMENT CURIIENT 6MA 100 OHMS J O On 0000 000 O O f t 0 00 4000 1 MFD H III J Q l 0 r 0 0 500 PLATE I 140 MFD SUPP ESSOR i ooo CONTROL GRID BIAS 4 230V 8 MFD Q L IL l5 9 20 000 SCREEN WIRING DIAGRAM OF MODEL 686 TYPE IDA 60 12 120 3 ELEMENT CURRENT ...

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