Keithley 261 User Manual Download | Manualshive

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Summary of Contents for 261

Page 1: ...Model 261 Picoampe reSource Instruction Manual Contains Operating and Servicing Information...

Page 2: ...t apply to delccts resulting from product modification without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable...

Page 3: ...Model 261 Picoampere Source Instruction Manual 0 1983 Keithley Instruments Inc Test Instrumentation Croup All rights reserved Cleveland Ohio U S A Third Printing Document Number 29046 Rev C...

Page 4: ...FICIENT ffl l C from 15 C to 30 C on 10 7 to 10 5A range settings Approximately O l5 C on lo 12 to 10 gA range settings Exact values for these ranges supplied with instrument WARM UP TIME 1 hour LINE...

Page 5: ...alculating Voltage Drop Error CompensatingEquation Compensation Drop for Input Voltage Drop of Shunt Type High Impedance Picoammetsrs CalculatingtheError CompenstitingEquations Compensation for Input...

Page 6: ...Circuit Connections GalvanometricMeasurements Guarded Circuit for Ohmmeter Calibration Top Chaws View BlockDiagram Voltage Supplv Board Component Location Drawina Calibr tion f d C Calibr tion f rd Co...

Page 7: ...United States West Ger many Great Britain the Netherlands Switzerland and Austria Information concerning the application operation or setvice of your instrument may be directed to the applica tions en...

Page 8: ...or 13 inch deep instruments Contact The Model 4003A Rack Mounting Kit allows the Model 261 your nearest Keithley representative or the factory for infor to be conveniently mounted in a standard 19 in...

Page 9: ...is located next to the OUTPUT connector 2 3 REAR PANEL CONTROLS AND TERMINALS Figure 2 2 shows the rear panel of the source The purpose of the various controls and terminals is described below Voltag...

Page 10: ...Figure 2 l Front Panel Controls and Terminals 0 0 II 0 III III III 0 6 0 GROUND AND VOLTAGE SWTCH FVSE LINE CORD COMMON TERMINALS Figure 2 2 Rear Panel Controls and Terminals 2 2...

Page 11: ...from the multiplier switch set tings regardless of the range switch setting The voltage drop of the picoammeter is a characteristic of that instru ment it can be found in its instruction manual or it...

Page 12: ...261 source voltage Most feedback elec trometers will easily meet this condition Any error caused by the picoammeter voltage drop may be eliminated by calcula tion if the voltage drop is known However...

Page 13: ...is the Model 261 source voltage read directly in volts from the multiplier switch settings When the input resistance is known Equation 4 where Ri is the picoammeter input resistance in ohms Rs is the...

Page 14: ...the voltage drop for this type picoammeter is about the equivalent of that of the feedback type picoammeter about 1mV or less Following the directions in paragraph 2 6 will ensure that Model 261 outpu...

Page 15: ...e output current value if the temperature effect is the only silgnificant source of error Is is the indicated current output range switch setting tlmes the multiplier switch settings la l s I l T T x...

Page 16: ...l 61OC to the least sensitive current range Varv the Model 261 source outout until a null is reached 5 Grabually increase the Model SiOC sensitivity nulling the current with the Model 261 c1zmtroIs in...

Page 17: ...Use guarded connections for measurements of 1OW and more as shown in Figure 3 3 Guarded connections are necessary in such cases to minimize the shunting effects of cable and connector leakage resista...

Page 18: ...5 F or above 26 C 62 F allow sufficient time for it to reach a temperature within this range Generally it takes one hour to stabilize an instrument that is 10 C 116 F out side the allotted range 2 Tur...

Page 19: ...le 43 If not calibration of the affected ranges will be required r 1 L Table 43 Range Resistor Accuracy 4 5 3 Multiplier Switch Setting Verification This procedure checks the accuracy of the divided p...

Page 20: ...ample The 10 I range reisistor is measured paragraph 4 51 and its value is 1 019 x 1OW The range potential is now adjusted when the range switch is set to 10 and the multiplier switches to 10 00 Using...

Page 21: ...is provided by zener diode D207 Any difference between these two voltages is amplified by a differential amplifier made up of D204 and D205 The signal is further amplified by Cl203 and applied to a Da...

Page 22: ...nnected as a guard S104 and S105 These resistors R120 through R1521 are when the calibration switch SlOl is in the CAL position used to divide the 1lVDC supplied by the voltage supply down to the sele...

Page 23: ...meat orilginal specifications Replace parts only as necessary The range resistors are specially selected and aged 10 ensure rate accuracy for three months after calibration Normally these resistors do...

Page 24: ...ounter clockwise until the carrier is free of the holder 2 If the voltage is about 17V 0202 might be shorted If the voltage at J202 is much less than 11 6V check the volt age at the collector of 0202...

Page 25: ...to circuit designation complete the service form which follows this section and return it with the instrument 7 3 ORDERING PARTS 7 5 SCHEMATIC DIAGRAM AND COMPONENT To place an order for Model 26 1 p...

Page 26: ...I l J...

Page 27: ...W 10 Resistor 12 811 l W Wirewound Resistw 12 6Q 196 W Wirewound Resistor 12 60 l W Wirewound Resistor 12 60 l W Wirewound Resistor 12 61 l W Wirewound Resistor 12 6R l W Wirewound Resistor 12 8R l W...

Page 28: ...1 2W Wirewound Slide Switch Cal Operate Rotary Switch less Components AMPERES Rotary Switch with Components AMPERES Knob Amperes Switch Rotary Switch less Components X 01 Multiplier Rotary Switch wit...

Page 29: ...l Left Support Bail Left Support Assembly Bail fqigh Support Bail Right Feet Feet Rubber Ball Bottom Panel Front Panel Chassis Asey Cable Clamp Shorting Link Label Range Switch Shield As sy Front Pane...

Page 30: ...Figure 7 5 X 01 Multiplier Switch S103 Figure 7 6 X 01 Multiplier Switch 5104 1 I0 il Y 34 z Figure 7 7 Xl Multiplier Switch S106 6 pl DECK 2 DECK 7 6...

Page 31: ...1...

Page 32: ...Particular range or function bad specify 0 Batteries and fuses are OK u Checked all cables 0 Calibration only 0 Data required u Certificate of calibration required attach any additional sheet as neces...

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