Keithley 616 Instruction Manual
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Keithley 616 Instruction Manual

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INSTRUCT ION MANUAL
Digital El ectrometer
Model 616
COPYRIGHT 1975 KEITHLEY INSTRUMENTS, INC.
N I NTH P RINTING, FEBRUARY, 1980, C LEVELAND, OHI O, U. S. A.
DOCUMENT NO.
28039

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  • Page 1 INSTRUCT ION MANUAL Digital El ectrometer Model 616 COPYRIGHT 1975 KEITHLEY INSTRUMENTS, INC. N I NTH P RINTING, FEBRUARY, 1980, C LEVELAND, OHI O, U. S. A. DOCUMENT NO. 28039...

  • Page 2: Table Of Contents

    M O DEL 616 CO NTENT S C O NTENTS Section - ---------------- - --- SPE C I F ICATIONS - ----------------------- - GENERAL INFORMAT ION --- - -- -- -- - ---------------- ----- - - --- - ----- INITIAL PREPARAT ION -----------...
  • Page 3 Use of lV Recorder Output Front Panel o f Model 6162 Dual Rack Mounting Using Model 1007 Hardware Re ar Panel of Model 616 and 6162 Diagram of Interconnection Cable between 616 and 6162 Identification of Pins on Digital Output Connector...
  • Page 4 SPECIFICATIONS MODEL 616 S PEC I F I C ATIO N S AS AN AUTORANGING VOLTMETER AS A COULOMBMETER ±10- l S microvolts per digit full range) coulomb per digit (10- 12 coulomb full ±l ruu�GE: RANGE: (lOmV ±lDO volts full range in five decade ranges.

  • Page 5: General Information

    MODEL GENERAL INFORMATION SECTION GENERAL INFORMATION Model Digi tal Electro­ warranty is stated INTRODUCTION. 1-2. 1-1. WARRANTY INFORMATION. meter is an automatic ranging , mUltipurpose electro­ on the inside front cover o f the manua l . microvolts per meter featuring sensitivity to digi t .

  • Page 6: Front Panel Controls

    GENER AL INFORMATION MODEL 616 TAELE 1-1. Front Panel Controls Control Functional DescriPtion Power ON Controls line power. SENSI TIVITY Sets voltage sensitivity and decimal point. 3-4a ZERO AdjuBtB zero offset. 3-40 RANGE Sets range on a chosen func tion.

  • Page 7: Rear Panel Connectors

    MODEL 616 GENERAL INFORMA!ION TABLE 1-2 . Rear Panel Controls . Control Functional Description Paragraph Line Switch S201 Sets instrument for nominal 117V or 234V. 2-3. Line Receptacle P201 Mates with 3-wire line cord . 2-3c FUSE Il7V: F201 3/16A (FU-29)

  • Page 8: Initial Preparation

    Line voltages which are not covered b y ranges The reco mmended warm-up time for the specified require an appropriate step-up or step­ Model 616 is two hours , although it is useable imme­ down power transformer. diately after power is turned on, for les8 critical measurements .

  • Page 9: Operating Instructions

    This section describes the procedures 3-1. GENERAL. The Model 616 provides 3-3. HOW TO SELECT FUNCTION. for operating the Model 616 [or measurement of volt­ a single front-panel rotary switch for selection of age, current, charge, and resistance. function and range.
  • Page 10 *NOTE Measurements From Very H1gh Source Resistance. To use the Model 616 as a voltmeter, set the front The Manual Range line MR is used to defeat panel controls as follows: the automatic sensitivity feature.
  • Page 11 Model 6012 Adapter is needed to mate the triax­ When the ial input with the UHF connector on the probe.) FAST/NORMAL Switch is set to FAST, the Model 616 is connected in a "FEEDBACK" amplifier configuration. Model 660lA Divider (100:1).
  • Page 12 . � ______________ • ________ • ________________ To rezero the Model 616 , set the ZERO CHECK switch IJb &fror in readlns due to circuit loadlns '" -100 to CHECK posit ion and adjust the front panel zero I meter R + R in If R in«...
  • Page 13 �) Considerations When Measuring Current. When using the Model 616 in either the NORMAL or FAST nodes, there are certain considerations which ensure optimum performance. In general, it is advantageous to use the smallest possible value of shunt resis­...

  • Page 14: To Loll

    Fast Mode Ohms Measurement. In this mode, the input terminals.where V I x R (the current I is measures very large resistances with Model 616 fast selected in decade steps using the RANGE Switch). resistances larger than use the Model...

  • Page 15: With The Model

    To select cur­ gration technique. When the Model 616 1s set to r e n t , set Model 616 to OHMS funct i o n . S e t OHMS range anyone of the 4 coulomb ranges , an accurately known to the appropriate position as shown in Table 3 - 6 .

  • Page 16: Null Method For Current Measurement

    F AST mode. The current source should be ad­ through the unknown resistance is measured by the justed to obtain a null reading on the Model 616 electrometer. The resistance is then calculated in (the electrometer should be set to an ap. p ropriate terms of the known voltage impressed and the re­...

  • Page 17: Front Panel Of Model 6162

    Position the Model 6162 on Rack Mounting. Proceed as described in the the left s i de of the Model 616 as shown in Figure above paragraph for bench mounting. Then attach an 19 since the interconnecting cable has been de­...

  • Page 18: Diagram Of Interconnection Cable Between 616 And 6162

    A mating 50-pin connector strobe lines are at Logic "0" (closure to output LO is furnished with the 6162 ( Keithley Part No. CS - 271 ). within 0.5 volt). Power Reguirements. The 6162 is powered from Print Rate.

  • Page 19: Respect To

    When the lipe voltage over the range of +2 and +12 volts. The "0" is released (Logic "1") the 616 returns to normal state is 0.5V at +35 mA (maximum) sink current. operating configuration. The front panel ZERO CHECK switch must be set - t-o OFF position to permit Word Seguence.

  • Page 20: Identification Of Pins On Digital Output Connector

    MODEL 616 OPERATING INSTRUCTIONS TABLE 3-9. Cross-Reference for Digital Outputs . Name Pin No. Remarks Pin No. Remarks Name Buffer Control Strobe 1 1 7 Buffer Control Strobe 1 11 Coded function lines Timing Output FLAG See Table 3-12 Timing Output Logic "1"...

  • Page 21: Polarity

    MODE L 616 OPERATING INSTRUCTIONS TABLE 3-10. Pin - Out for 50-Pin Connector Pin No. Name F unction Pin No. Name F unction Strobe 114 Buffer Control 4 x 10 Data 113 Output Hold Control FLAG Timing Output Strobe 11 7...

  • Page 22: Suggested Hook-Up For Data Lines

    MODEL 616 OPERATING INSTRUCTIONS TABLE 3-14. Truth Table for Serial Transfer Strobe Condition O f St·robe Line s . Output Output Output Output Line EXP POL Exp 1 x 10 Exp 1 x 10 Exp 2 x 10 Exp 4 x 10...

  • Page 23: Timing Diagram For 6162 Outputs

    10100 ISOLATION ISOLATION 1 l00V 10100, 1000V 1080, 100V System . FIGURE Block Diagram of 2 1 . 616/6162 201 6 20 1 6 COUNTS COUNTS " COUNT NOWII I I COUNT NOW" RESET RESET " C N " 6 1 6...

  • Page 25: Theory Of Operation

    4 - 1 . GENERAL. This s e c tion contains information to Shunt (NORMAL ) Mode Operation. (Refer to describe the Model 616 circuit operation. The cir­ schematic 25764E ) . In the IINORMAL" mode, the elec­ cuitry i s located on five print�d circuit boards .

  • Page 26: Unity Gain

    MODEL 616 THEORY OF OPERATION (Refer to schematic TABLE 4-l. Zero Check Operation. Voltage Gain 25764E). The front panel ZERO CHECK switch (S102) operates a relay solenoid (KIal) when set to ZERO � Gain Sensitivity CHECK. In the energized state (as shown on the schematic) the relay contact is closed.
  • Page 27 MODEL 616 THEORY OF OPERATION INPUT ZERO CHECK �CA5E FIGURE 25 . Voltmeter Configuration - NORMAL Mode . Gain Selection Logic. Zero Adjustmen t . Potentiometer R311 is an (Refer to schematics 25776D. 25778E) . A three line ranging code is internal zero adjus tment for calibrating the "...
  • Page 28 THEORY OF OPERATION MODEL 616 I dt >--1 Coulombmeter Configuration - FAST Mode . FIGURE 2 7 . TABLE 4-4. Coulombmeter Operation. (Refer to schematic In the COULOMB mode, a range capacitor Ohmmeter Divider Network 25764E) . (ClGl through elll) is connected between input HI...

  • Page 29: Functional Block Diagram Of A-To-D Converter

    MODEL 616 (Refer to 4-3. ANALOG-Te-DIGITAL CONVERTER. (Refer to schematic 25776D ) . This circuit detects the schematics 25776D, 25778E) . The a - to-d converter polarity of the input signal and triggers the operates on a charge balancing principle.

  • Page 30: Functional Block Diagram Of Large Scale Integrated Circuit

    . The auto­ (MR) ranging feature is defeated by grounding pin 6 on LSI QA408 . The 616 disp lay is composed of DISPLAY DRIVE . 4-5. four LED, 7-segment readouts plus a polarity /over­ FIGURE 3 1 .
  • Page 31 1-2-3 of T20l. Diodes range i s selected , the 616 display indicates a D20l through D204 form voltage-doubling supplies . f i f th d i g i t (DN40 2) and decimal p o i n t .
  • Page 32 7 seconds per reading . The Print Rate ed emitter or emitter- follower configuration . control has no effect on the Model 616 disp lay rate. The Model 6162 utilizes three The Flag output is generated Decade Counters .

  • Page 33: Accessories

    MODEL 616 ACCESSORIES S E C T I O N A C C E S S O R I E S 5 - 1 . GENERAL. 5 - 2 . OPERATING INSTRUCT ION S . following K e i t h l e y a c c e s s o r i e s...

  • Page 34: Model 6011

    LO is floated above CASE ground . c l ip s . This cable mates directly with the triaxial The cable is fabricated u s ing a Keithley part input. no . CS N 14 1 connector and part no. SC-22 low-noise cable.
  • Page 35 Mode l 6106 Electrometer Connec t i on K i t Descript ion : P a r t s L is t : Item Keithley The Model 6106 contains a group of the most useful Part No. leads and adapters for low current measurement s .

  • Page 36: Teflon-Insulated

    The Keithley Model 6105 Resistivity Adapter has been des igned for use with a Keithley elec trometer and an optional high voltage supply such as the Mode l 2 40A. 1175...

  • Page 37: Maintenanc E

    Fuse Check: Verify that the appropriate line fuse is installed. Apply dc voltages t o the input of the Model 616 as given in Table 6-2 using Voltage Source (A) . 1 1 I V : 3/16 ampere, 3AG, SLO-8LO (Keithley FU�29) TABLE 6 - 2 .
  • Page 38 MODEL MAINTENANCE Resistance Accuracy Check. Check the lO- l A to lO - 4 A ranges in accord with Tab 1e 6-4. NORMAL Select mode. Select FAST mode for verification of IO -S A to IO - l lA ranges. Select the 1 V O LT SENSITI VITY mode.
  • Page 39 NOTE 117.\': I f the front panel ZERO control does not pro­ 3/16 ampere, 3AG, SLo-BLO (Keithley FU-29) 1/10 ampere, 3AG, SLO - BLO (Keithley FU - 40) 234V: vide enough adjus tment capability, the inter­ nal potentiometer R123 should be adjusted.
  • Page 40 Apply -IV de ± O . 03% using Voltage Source (I ) . a ) . Place ZERO CHECK t o o f f . c) . Reading on Model 616 should be - 1 . 000 ±o b ) . Select lV SENSITIVITY. digit. c ) .
  • Page 41 7 - 2 . ELECTRICAL SCHEMATICS AND DIAGRAMS . Schematics S a l e s Service Department , Keithley Instrumen t s , Inc. and d iagrams are included to describe the e lectrical or your neares t Keithley representative .

  • Page 42: Figure No

    MODEL 616 REPLACEABLE PART S TABLE 7-3 . Circuit Designation Series Circuit Desi g nation Series Electrometer Amplifier PC-321, 361 Power Supply PC-32l Auto-Ranging Amplifier PC-324 PC-324 Integrator, Threshold Det. Digital Logic & Display PC-322 , 32 3 TABLE 7-4.
  • Page 43 MODEL 6 1 6 REPLACEABLE PARTS F IGURE 3 2 . Cha s s i s A s semb l y - Ex p l oded View . � I£l &01T4,.. CO�l'" "'''t ",-� oo T ... "' . .. �c. Dn F I GURE 33 .

  • Page 44: Ran Ge

    MODEL 616 REPLACEABLE PARTS COMPONENT DESIGNAT ION LISTING Parts Shown on Schematic No. 25764E Keithley Circuit Part No . Location Capacitor, 5 pF, 200V, Poly C31-5P Range Switch ClOl Cl3B - IOP Capacito r , 10 pF , SOOV , Poly...
  • Page 45 REPLACEABLE PARTS MODEL 616 COMPONENT DESIGNATION LISTING Parts Shown on Schematic No . 25764 Circuit Ke thley Location Part No . Q101 See page 44 Q102 See page 44 Se e page 44 Ql03 See page Ql04 Transistor, NPN TG-l03...
  • Page 46 MODEL 616 REPLACEABLE PARTS COMPONENT DES IGNAT ION LISTING Parts Shown on Schematic No. 25777D Keithley Circuit Part No. Location C240- 4 . 7M PC-321 C201 Capaci tor, 4 . 7 �F , 350V, EAL Capacitor, 10 � F , 350V , EAt...
  • Page 47 REPLACEABLE PARTS MODEL 616 COMPONENT DES IGNAT ION LIST ING Parts Shown on Schematic No. 25777D Circuit Keithley Part No. Location S201 Switch (117 - 234V) SW-151 Rear Panel Switch, Toggle (Power ON) SW-236 Front Panel S202 T201 Transformer TR-1S2...
  • Page 48 REPLACEABLE PARTS MODEL 616 COMPONENT DESIGNATION LISTING Parts Shown on Schematic No. 25776D Keithley Circuit Part No. Location C301 Capacitor, 330 pF, lOOOV, CerD C64-330P PC-324 Capacitor, 39 �F, 15V, Epoxy C228- 39M PC-324 C302 C303 Capacitor, 39 �F , 15V, Epoxy...

  • Page 49: Digital Display

    REPLACEABLE PARTS MODEL 616 COMPONENT DESIGNATION LIST ING Parts Shown on Schematic No. 25778B Circuit Keithley Part No. Location C401 Capac i t o r , O . Ol � F . s o a v . CerD C 2 2 - . 01M PC-323 O .
  • Page 50 MODEL 616 REPL�CEABLE PARTS COMPONENT DESIGNATION LISTING Parts Shown on Schematic No . 25778E Keithley Circuit Part No. Location PC-322 R76- 1 . 1K R401 Resistor, 1 . 1KQ, 10% , 1/4W, Camp RBB-B45 Res istor, 8450, 10%, 1/4VT, Camp...
  • Page 51 REPLACEABLE PARTS MODEL 6162 COMPONENT DES IGNATION LIST ING Parts Shown on Schematic 25715D Circuit Mfr . Mfr. Keithley Code Desig. Part No . ClO1 Capacitor, 4J.lF, lOOV, My 14752 230BIB505 C24 5-4M D101 Diode 1N87 RF-39 DlO2 Diode 1NB7...
  • Page 52 MODEL 6162 REPLACEABLE PART S COMPONENT DESIGNATION LISTING Parts Shown on Schematic No. 257160 Mfr. Mfr. Keithley Circuit Code Part No. AMPX C178-.00rn C280AE Capacitor, O . OOl�F, 250V, MtF C201 AMPX C280AE C178-. 00rn Capacitor, O . OOl�F, 250V, MtF...
  • Page 53 MODEL 6162 REPLACEABLE PARTS COMPONENT DESIGNATION LISTING Parts Shown on Schematic No. 25717C Cireui t Mfr. Mfr. Keithley Code Desig. Part No. Germanium , 20V, 50 rnA D301 15238 1N3592 RF-39 Germanium, 20V, 50 rnA D302 15238 1N3592 RF-39 Germanium, 20V, 50 rnA...
  • Page 54 1s furnished for each printed circuit assembly. The Keithley part number should be used whenever replacement parts are ordered from Keithley Instruments or its representatives. MAIN CHASSIS - FRONr PANEL MISCELLANEOUS Mfr.
  • Page 55 REPLACEABLE PARTS MODEL 616 REAR CMASSIS - MAIN PANEL MISCELLANEOUS Mfr. Circuit Quantity Keithley Part No. J121, J122 DF21 58474 Binding POBt, Whtt� . (Xl) BP-llW 3123 58474 DF21 Binding POBt, Red (lV) BP-llR 58474 DF21 t , Black (LO)
  • Page 57 REPLACEABLE PARTS '" 1',\ P110 P 1 1 5 • • P I 1 6 " �' � PlOS " !b� � " T P /j e • • • • � � � C:14 , � " Q A2 03 PI07 ' ;...
  • Page 58 i' i {;'-; - Ur:l ' - , ' , "'�'--' "'"'' -. y,." ,-�,- ", - - ' '''''''' '' ' , • . '- ,W.=""...
  • Page 59 MODEL 616 REPLACEABLE PARTS DISPLAY BOARD PC-322 MISCELLANEOUS Mfr. Circuit Keithley Quant ity Part No. Per Assembly Mfr. R- 76-1.1K Res istor, 1 . lKn, 10%, 1/4W, Camp 01121 CB112-10% R401 Resistor Network, 16-pin DIP TF-41 Special RN401 Digital Display (Seven Segment) *...
  • Page 60 REPLACEABLE PARTS MODEL 616 LOGIC BOARD PC-323 INTEGRATED CIRCUITS 9uantity Mfr. Circuit Keithley Part No. Mfr. 04713 MC858P QA403 Quad NAND , 14-pin DIP IC-22 Hex Inverters , 14-pin DIP 01295 SN7403N QA404 ,405 IC-45 Hex Inver ter, 14-pin DIP...

  • Page 61: Replaceable Parts

    MODEL 6 16 REPLACEABLE PARTS � � Q ((4 08 � rn 0 t l C) Q40 9 ----@il l}- Q4l0 Q411 ��� -(!§)- QA408 � � -[J!§}- C404 � -!mID- REV. B . FIGURE 3 7 . Component Layout , PC-3Z3 . (Logic Board) 057 7...
  • Page 62 MOOEL REPLACEABLE PARTS RANGING BOARD PC-324 CAPACITORS Quantity Mfr . Circuit Keithley Mfr. Desig. Part No . Per Assembly Description Desig. C64 - 330P 330pF , lOOV, CerD 71590 00-331 C301 C178 - . 1M O . l ]..l F , 250V, MtF...
  • Page 63 MODEL REPLACEABLE PART S ----<E!D­ -� " '" , . • • � . . . •• ..• FIGURE 3 8 . Component Layout , PC-32 4 . (Ranging Board) 1 1 7 5...
  • Page 64 MODEL 616 REPLACEABLE PART S PC-361 MISCELLANEOUS Keithley Quantity Mfr. Circuit Part No . Per Assembly Mfr. Capacitor, . OOlVF, lOOOV , CerD C64-. 00lM 72982 808000Z5RO C113 Integrated Circui t , 8-pin DIP QA101 IC-74 32293 ITS6214 RESISTORS R76-100K...
  • Page 65 SCHEMATICS MODEL 616 S C H E M AT I C S Schematic diagrams are furnished t o describe the Model 616 Digital Electrometer and the Model 6 1 6 2 Isolated Output Control . MODEL 616 Schema tic No .
  • Page 66 � § • � � • � � • • � � � > > " � ;:: 'i � t'l � i � � '" r '" C0'-l-''l-_-l-� " " � • • ·1 • • ; � tI( , 1 ' �...
  • Page 68 0.100£:. (, 1 f, 2 - -1- L X P " [ , " " £ 6162 i' X [YP. " X I() " x POLt,; ; , r 1 0 1 8 x IO - t- - - -t - t- - t - - - 'V - -...
  • Page 69 "/74 �.et> _�,. , �.� HE' I',� ,- "'�, 4'-SO R ..:,.. < t<O ,.�c S SibS ADD"-<> (404 A<><><;D • � -I- S V ",- ' GI,.05 G,4'106 Q40? 8 14 PIO.? ",: i RN402-A RN402-E 402- RN402_C ", ", ;...

  • Page 70: Range

    ItAANU<4L 6162-616 INTERC D/SPLAY P€J#OTE ""' - D RANGE Z E R O CHECK .16e PIOZE JIl..-e ""'" "OX flOI "" 7/1:J-A II/ +#( Q AI 0 3 710K 71'_ RIO ? JW"" III$-F :1IOI-D JI/3-0 7103-.4 Ij�-G '''' X 2r - - 1 ' .7101-£...
  • Page 71 6/6i! co'" NOTES: SHALL CAPAC/TANCE DESIGNATED &. RES IST ANCE &. UNLESS MICROFARADS K 1000 OTHERWISE NOTED. OHM. pr: P IC OF ARAD. • POHTIONS OF DEVICE SHOWN ON"OTHEf? SCHEMATICS. @ NO. IN CIRCLE INDICATES PIN ON CONNECTOR. 6/62�5V STROBE DaPN S11;tlI£...
  • Page 72 n(P.4XIO O POL. ST�£c 5T"'D� ! £XP.IKIO O EXP'8XIO O EX/liXIO' EXP.cX/ O O E X P. "" ..co_<roo .,",,"0> o. 0'" ... " 0."-2 04 �p !ATCH Q"204 " T O /ArCH 0..0. III-A (USED WITI. IXIOJ POL/NO. MJTE5: &.
  • Page 73 Q A 401 + IOV T401 UNREGULA TED © 234V 5 4 01 C403 2000 C402 1 1 7 V 0540 1 0 4 02 CIRCUIT J402 5 4 0 2 J401 ALL RESISTfoNCE & CAPACITANCE SHALL B E UESIGNA T I: l> I N {}f-15 & MICROFARADS I..NLE S S OTHERl ..
  • Page 74 KEITHLEY I NSTRUMENT S , I NC . 28775 AURORA ROAD CLEVELAN D , OH I O 44139 S E R V I C E FO R M MODEL S E R I AL NO . P . O . N O .
  • Page 75 Addendum 28039-8-1 K E I T H LEY Page 1 /3/83 Instruction Manual Addend um M odel Dig ital Electrometer The following information is supplied as a supplement to this manual in order to provide the user with the latest improvements in the least possible time. It is recommended that the information supplied in this addendum be incorporated into the appropriate places in the manual immediately.
  • Page 76 28039-8-1 Page 2 of 3 Table 1 . Parts List For PC-S01 and PC-S02 Keithley Circuit Part No. Deslg. Description C-22-.01 C l 1 3 Capacitor, O.Ol I"F, ± 20 % , 500V, Ceramic Disc C l 1 7 Capacitor, 10pF, ± 20%, 1000V, Ceramic Disc...
  • Page 77 28039-8-1 Page 3 of 3 Figure 39. Component Layout, PC-60' Figure 39. Component Layout, PC-602...
  • Page 78 6162 MODEL. EXP. EXP. 4)(10 0 !Jr / O O I X IO ' 8 X IOV 2 )( 10 0 POL.ARITY "2 - -i - -t - - i- - - t- - - - f- - -t- ExP. EXP.

  • Page 79: Specifications

    INSTRUCTION CHANGE NOTICE MODEL D I GITAL ELECTROMETER INTRODUCTION: Since Keithley Instruments is continually improving produ performance and reliab ility, i t is often necessary to make changes t o Instruction t o reflect Manuals these improvement s . Als o , errors in> Instruc­...

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