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Содержание 610B

Страница 1: ...Instruction Manual Models 6106 610BR Mul_tl flqnge ElecVpeters Keithley Instruments Inc 26775 Aurora Road Cleveland Ohio 44139A216 248 0400...

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Страница 3: ...asurements 18 2 14 Application Notes 19 5 l Model 6101A Shielded Test Lead 43 5 2 Model 61018 Gripping Probe 43 5 3 Model 6102A Voltage Divider Probe 43 5 4 Model 6103A Voltage Divider Probe 43 5 5 Mo...

Страница 4: ...GENERAL DESCRIPTION MODELS 6lOB 610BR ELECTROMETERS FIG FIGURE 2 Keithley Instruments Model 610BR Electrometer Model 610BR is the rack version of the Model 6108 ii i 1064R...

Страница 5: ...08 is 200 microvolts per hour maxirmun averaged over any 24 hour period after warm up During the 2 hour warm up zero drift is no more then 2 millivolts after the first hour c Two amplifier outputs are...

Страница 6: ...o tOdL4 ampere ranges METER NOISE Less than i3 x lO L5 ampere GRID CURRENT Less than 2 x lO L4 ampere AS AN OHMMETER RANGE 100 ohms full scale co 1014 ohms on twenty five Linear Lx and 3x ranges KcIJR...

Страница 7: ...3 2 power line adapter binding plug l 5 APPLICATIONS a Voltmeter applications include directly measuring potentials of vacuum tube plates and grids pH electrodes piezo electric crystals capacitors and...

Страница 8: ...f Model 6107 pH Electrode Adapter has a 2 Eoot cable and coaxial caxxector and accepts a Beckman and Coleman B C or a Leeds and Northrup L N connector The Adapter allows accurate and convenient pH pot...

Страница 9: ...n the Range Switch is set to VOLTS The Multiplier Switch may also be used to multiply the AMPERES 3x maxinolm setting above LO 3 OHMS and COULOMBS ranges on the Range Switch c METER Switch The Switch...

Страница 10: ...ument will drive l milliampere recorders In the 3 V position the output is 3 voles for full scale meter deflection Source resistance is 3 kllohms c 1 MA CAL Control The Control varies the output from...

Страница 11: ...s the shielding is thorough any alteration in the electrostatic field near the Input circuitry will cause definite meter disturbances c Use high resistance Low Loss materials such as Teflon reconrmend...

Страница 12: ...the Model 6108 is carefully selected to minimize these signals s Connect the M deL 610B to the circuit only when a reading is being made I some cases the grid current can charge the external test circ...

Страница 13: ...ro offset This is corrected with the Zero Con trols Drifting however can occur for a few hours f Although the grid current of the Electrometer is much below that found in conventional voltmeters it ca...

Страница 14: ...ause the scale span is shorter 2 6 Currant Mearuremantr a The Model 610B can measure currents three ways 1 In the normal method used on any range the current is determined by measuring the voltage dro...

Страница 15: ...voltage coefficient of a nominal y 0277 per volt If the input voltage drop reaches 100 volts en error of 100 x 02 or 2 occurs to lower the specified accuracy Therefore use a low filtiplier Switch sett...

Страница 16: ...s using the unity gain output paragraph Z 10 C Do not use the fast method to measure capacitor leakages Connecting a capacitor to the input causes the circuit to be transformed into a differ entiator...

Страница 17: ...s a fast picoammeter The unknown resistance sample is connected to an external known voltage source and the current through the sample is measured Either the normal or fast method may be used The resi...

Страница 18: ...on 2 Read the resistance as outlined for the normal method subparagraph b d External Voltage Method To 016 ohms 1 Turn the ZERO CHECK Switch to L OCK Connect the sample between the INPUT Receptacle an...

Страница 19: ...ding is on scale Changing the Multiplier Switch setting does not affect the transfer of charge from the un known source to the instrument If increasing sensitivity with the Multiplier Switch does not...

Страница 20: ...ange For exact output adjust the meter on the 003 volt range with the FINE ZERO Control for full scale deflection Then adjust the 1 MA CAL Control until the recorder reeds full scale Check the recorde...

Страница 21: ...tched in by the amplifier on the 0 3 volt and higher ranges is too slight to be read on the meter but it can cause an error in accurate measurements using the unity gain output cl t It 000000 Vx 6108...

Страница 22: ...pacitance is easily figured a Charge the capacitor as follows 1 Set the Model 610B front panel controls to METER Switch Range Switch VOLTS Multiplier Switch OOl to 100 FEEDBACK Switch NORMAL ZERO CHEC...

Страница 23: ...e diagram shows the Model 610B acting as a current integrator A square wave from a current source I is applied to the Model 610B input Using the COULOMBS ranges the output through the unity gain termi...

Страница 24: ...circuit shown Fn Figure 13 if the input resistance RF and diode leakage resistance Rd are high and if the time constant of the RC combination is high compared to the period of the signal the capacito...

Страница 25: ...super regulated low voltage transistorized power supply furnishes the necessary amplifier power 3 2 VOLTMETER OPERATION a The voltmeter amplifier has matched electrometer input tubes followed by three...

Страница 26: ...stage V103 drives the amplifier ground at the same poten tial as the input signal This means the ground terminal of the amplifier is not at chassis ground but is connected directly to the cathode of...

Страница 27: ...grids This connection stabilizes the electrometer plate potential and tube operating points Also for signals arriving at the VZOL control grid the first stage gain will be much greater than spurious s...

Страница 28: ...negative feedback The differential amplifier output is divided by the tiltiplier Switch resistors R156 to R166 and fed back to the amplifier input through a feedback resistor selected with the Range S...

Страница 29: ...es correspond to the schematic b Guarded Method In the guarded method of resistance measurements FEED BACK Switch inF ition and the sample resistance connected between the input terminal JlOl and the...

Страница 30: ...ated by comparing e sample voltage from dividers R212 and R214 to the zener diode reference D210 If e voltage difference exists ft is amplified by a differential amplifier consisting of transistors 42...

Страница 31: ...biases diode D208 thus preventing the collector of Q203 from going more negative Since the collector voltage cannot rise further amplification is prevented and therefore further current increase is p...

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Страница 33: ...of operation They can be checked only by replacement Standard 5886 tubes could be used in an emergency but the drift noise and grid current specifications may not be met When replacing the electromete...

Страница 34: ...resentative b Table 2 contains the more conrmon troubles which might occur If the re pairs indicated in the table do not clear up the trouble find the difficulty through a circuit by circuit check suc...

Страница 35: ...ithin 10 For this measurement use output ground as the co anon connection for both supplies e Amplifier 1 To check the amplifier disconnect the feedback 150 by removing the output tube V103 This allow...

Страница 36: ...34 Change the fuse from l 4 ampere to l 8 ampere No other adjustment is necessary To switch from 234 to 117 volt operation reverse the procedures 4 6 CALIBRATION PROCEDURES a The following procedures...

Страница 37: ...Model 610B paragraph 4 12 once a year after the other adjustments or if improper operation is suspected c If the tide1 610B is not within specifications after the calibrations and adjustments follow...

Страница 38: ...Figure 21 Make the connections from the component side of the printed circuit board Float the Model 662 ground terminal c Adjust the DC AMP BAL potentiometer R177 Figure 19 until the meter shows a nu...

Страница 39: ...OFF Set the mechanical Zero Meter adjust ment for zero meter reading top scale zero b Turn the Model 610B on Zero the meter on the OOl volt range Then switch to the LO volt range Set the Multiplier Sw...

Страница 40: ...to Full Scale 10 7 10 B ampere 30 seconds 10 B 10 g 10 g ampere 30 seconds 10 10 10 10 ampere 30 seconds 10 11 ampere 30 seconds 4 TABLE 5 Coulomb Ranges Accuracy Check The table gives the input curre...

Страница 41: ...the drift is no more than 2 millivolts in the second hour In any subsequent 24 hour period the average drift will not exceed 200 microvolts per hour FIGURE 19 Side View of Model 610B Chassis Front pa...

Страница 42: ...ERS rinced tircuir 86 23 24 FIGURE 20 Side View of Model 610B Chassis Front panel faces left Locatfon of components and printed circuits is shown Refer to the Parts List for circuit designations Figur...

Страница 43: ...10B 610BR ELECTROMETERS HAINTEXANCC FIGURE 21 Component Locations on Printed Circuit 85 si o i 3 FIGURE 22 left Component Locations on Printed Circuit 84 The red dots on VlOl and V102 are toward each...

Страница 44: ......

Страница 45: ...mponent Locations on Range Switch SlOl Figure 26 shows the high megohm resistors Capacitors Cl03 and C104 not shown are parallel to capacitors Cl05 and C106 RI12 Cl02 FIGURE 26 Component Locations on...

Страница 46: ...ions of MEDIUM and FINE ZERO Controls Also refer to Figure 28 Rl jl FIGURE 28 Component Locations of MEDIUM and FINE ZERO Controls Also refer to Figure 27 R147 RI46 FIGURE 30 Component Locations Rlj7...

Страница 47: ...directly into the Model 6108 INPUT Receptacle 5 3 MODEL 6102 VOLTAGE DIVIDER PROBE a The Model 6102A is a LO 1 voltage divider with an input resistance of 1010 ohms it can be used with the Model 6108...

Страница 48: ...ation 1 For guarded measurements make the connections as above with some additional steps 2 Connect the Ebdel 6104 black external plug to the Model 6lOB GUARD terminal 3 Connect either terminal marked...

Страница 49: ...on the rear panel to the center terminal of the Model 6105 Power Receptacle Other operating procedures are as for the 3 unit system The current from the Model 6lOB is the reciprocal of the OHMS setti...

Страница 50: ...connection to the electrometer and two alligator clips for connection to the circuit under test The second lead has two uhf plugs See Table 2 for model numbers Adapters are also supplied for uhf to b...

Страница 51: ...r allows checking zero on the Model 610B without shorting the pH electrodes c To use the Model 6107 with the Model 6LOB set both the ZERO CHECK Button on LGlJU 3b Keitniey lodeL bLUb Electrometer Conn...

Страница 52: ...eters The Recorder is a high quality economical instrument that maximizes the performance of the Model 6108 and many other Kefthley instruments even in the most critical applications The Model 370 can...

Страница 53: ...y Xodel J U Especially Designed Eor use with Keithley Electrometers and Other Instruments The XodeL 370 can be directly connected to the Model 610B output with the Recorder s accessory cable Response...

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Страница 55: ...cription of the part All structural parts and those parts coded for Keithley manufacture 80164 must be ordered from Keithley Instruments Inc In ordering a part not listed in the Replaceable Parts List...

Страница 56: ...D ETB ETB 84411 601 PE 72902 80125VlO2P 72982 81125V472P 73445 C426 56289 TE1064 CerD 72982 CerD 72982 EMC 53021 EMC 53021 PA1 56289 ETB 56289 EXB 56209 CerD 72982 EM 56289 Type Number DIODES 831U2M22...

Страница 57: ...f JlO5 Mfg No 80 MCZM Choke 25 mhy Mfg No 6302 Choke 25 mhy Mfg No 6302 Meter Meter Alternate Cord Set 6 feet Mfg No 4638 13 Strain Relief Rotary Switch less components Range Rotary Switch with compon...

Страница 58: ...l 1OM 25 RL02 10 n l 10 w ww 91637 RSE 10 R34 10 25 R103 100 n la 10 w ww 91637 RSE 10 R34 100 25 R104 1 kn I l 2 w DCb 79727 CFE 15 R12 1K 25 R105 10 kn l l 2 DCb 79727 CFE 15 R12 10K 25 Rl06 Rl07 Rl...

Страница 59: ...4 DCb 79727 CFE 15 RLZ 3K 27 MtF 07716 CEC R94 301K 21 Deb 79727 CFE 15 R12 100 19 DCb 79727 CFE 15 Rl2 LOO 19 DCb 79727 CFE 15 RL2 100 19 DCb 79727 CFE 15 R12 LOO 19 DCb 79727 CFE 15 R12 100 19 DCb 7...

Страница 60: ...l 2 w LO L 2 w l l 2 lO l 2 w l l 2 w lO l 2 w L L 2 wa 01686 T 2A WWVar 71450 AW DCb 79727 CFE 15 DCb 79727 CFE 15 DCb 79727 CFE 15 Camp 01121 EB ComP 01121 EB ComP 01121 EB War 71450 AW WVar 71450...

Страница 61: ...rder only from Keithley Instruments Inc I 00686 01121 01295 01686 02660 02735 Film Capacitors Inc New York N Y Allen Bradley Corp Milwaukee Wis Texas Instxuments Inc Semi Conductor Components Division...

Страница 62: ...rth American Philips Co Inc Hicksville N Y 75915 Littelfuse Inc Des Plaines Ill 76493 Miller J W Co Los Angeles Calif 79727 Continental Wirt Electronics Corp Philadelphia Pa 80164 Keithley Instruments...

Страница 63: ...I t RlL 4n II II I r...

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