Keithley 414, Instruction Manual

Page 1: ...INSTRUCTION MANUAL MODEL 414 414C MICRO MICROAMMETER...

Page 2: ...PMENT Be sure to include the instrument model num ber and serial number in all communications if the instrument is damaged when received or fails to operate properly a claim should be filed with the c...

Page 3: ...t Noise Connectors Accessories Available Cabinet OPERATION Operating Controls Operation CIRCUIT DESCRIPTION Basic Theory Circuit Description MAINTEUANCE Factory Adjustments Trouble Shooting Voltage Re...

Page 4: ...plicity of operation For recording an output signal of five volts at 1 milliampere is available This model is identical to the klh except that a meter relay replaces the panel meter An adjustable cont...

Page 5: ...m up if the source voltage is not less than one volt Greater than 0 2 second for 67 of full scale on any range with up to 5000 micro microfarads of input capacity Zero check switch allows zeroing of t...

Page 6: ...s is not re versed by this switch This knob next to the meter is used in conjunction with the ZEROCHECKswitch as described above to set the instrument zero If the instrument is to be used at its extre...

Page 7: ...volts DC IL Recording The Model hlh is provided with binding posts at the front of the instrument and a connector at the rear for connection to a recorder A mating plug is provided for the rear connec...

Page 8: ...since all the current must flow through R i q e e k _ _ _ R 2 now if the loop gain is large the current flowing through the input is e R and may be read from a properly calibrated meter at the output...

Page 9: ...ecessary degree by an NE81 neon lamp The amplifier is a simple single ended direct coupled amplifier Vl and V2 are directly coupled and the coupling between V2 and V3 is by means of a NE81 neon lamp R...

Page 10: ...The ripple again should not exceed 3 volts RMS If either potential is no t correct the trouble is probably due to a defective rectifier or filter component although in some cases the transformer may b...

Page 11: ...this is not possible check for an open tape on the printed circuit board from Vl to V2 If everything checks to this point measure the voltage on pin 9 of V2 The voltage should pass through 38 volts by...

Page 12: ...f ficient be sure shielding of input is satisfactory before proceeding The only other causes of inaccuracy are either insufficient loop gain or inaccurate feedback resistors If the feedback resistor i...

Page 13: ...35 20 8 201 c22 02 RI 500 RIG 1 67 RI 2 51 1 16 7 R12 50K Rl 246 K Rx 5OOK 2 1 67 lii2 5 OM 3 1 6 7M RlIt 50 OM Ri JI l OOM R2O 109 R20 l OLO R lL2 1K RI 2 Z Rl 2 2K nl2 250 12 250 WI 7OK H ij TOM RIG...

Page 14: ...switch ceramic insulated Transformer Primary l llsv SO 60 cy Primary 2 llSv SO 60 cy Secondary 1 325 6 LO ma Secondary 2 22Ov 20 mas Secondary 3 6 3v 2 a Secondary H3 6 3 6 a Vl v2 2 FUl ME1 Electrome...

Page 15: ...utput Connect c205 RX 1 ME1 RF6 SW3 output Plug Type AN3102A 18 1s cs 23 Capacitor electrolytic 1000 x 15 WV al 1000 SPDT 6 Volt AC Relay RL7 or RL8 O 200 ma Model h61 26 Assembly Products ME 20 Selen...

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Page 19: ...Circuit Mfg Keithley I Desl g Fig Description CO Part NO _ Ref _ 21850 MOS PET Input Plug in Card 80164 23734A 6 1 I page 20 Change to the following Circuit Mfg Mfg Keithley Fig 1 Dosig Value Rtiting...

Page 20: ...owing Circuit Mfg Keithlcy Fig pcsir Descri ption code Part No Ref 21850 MOS FET Input Plug in Card 80164 2373m 7 af 33 __ Change to the following Circuit Desig RI 31 Valrvs 2 kfl Mfg Mfg Kei thley Fi...

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Page 22: ...56289 Page 6 3 Change to the follovfng Circuit Desig Description _ Trenafonner Mfg No Kl 226 Page 6 5 Change to the following Circuit Mfg Desig Number Code Vl 5886 80164 Mfg Keithley Part No Part No L...

Page 23: ...Paste6 2 chauge to the folla io D101 8111W Oll Pm255 02735 R 1 A PC Ill02 SilieOn lN3255 02735 RF BYA vc 812s IOMll l 112 w RCb 19727 cm 3...

Page 24: ...y wet 24D powr supply Twr wthod pmteato otbm ormitoring dewlam wmnaetad to tha cutpot of elm KALthley Model 414 3 An additlmal deck switch is added to the range atitch SW 2 sad 18 wirer brought to a a...

Page 25: ...b Change to the f olhvtng Clll 510 pf 500 Poly 71590 CPR 51O T CJ 30 51OP Rs Cl12 47 pf 500 Poly 71590 cm 47 i Cl 38 47P Rs DlOI Silicon Is 3255 02735 RF l 7 P6 D1 02 SZl 20n m3255 02735 RF 17 PC 715...

Page 26: ...1964 Change to the folloving ma Silicon rectifier lN3255 RF2 Silicon rectifier IN3255 BR4 Silicon rectifier lN3256 RemoveW3 and lW5 Keithley Pert RF 17A Keithley Part lW17A ICeithLey Pert RF 22 Remov...

Page 27: ...on tom Cer tificate of Compli ance 0 Node the calibration for details see reverse side of this form 3 To help repair then instrument briefly de scribe the probl am Intermittant ansients e Line voltage...

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