Keithley 616 Service manual

INSTRUCTION MANUAL Digital Electrometer

Model 616

NINTH PRINTING, FEBRUARY, 1980, CLEVELAND, OHIO, U. S. A.

DOCUMENT NO. 28039

COWENTS

CONTENTS

Section

SpECIFIC*TIONS ---------------------------------------------------- i”

1. GENW&jJ, I~O~TpJ)q _---__------__-_-___----------------------- 1

INITIAL pREp)&qlON _____-_-_-_-_-_---------------------------- 4

2.

()PEI(ATING lNS*RlJCTIONS __-_------------------------------------ 5

3.

4. THEORY ,-Jr OpE~T~ON __-___------__-_-___----------------------- 21

5. *CCESSORIES __-___--_--__-__________________________----------- *g

6. MAINTENANCE -------------------_------------------------------ 33

7. REPLACEABLE PARTS ---_-_--------___-__-------------------------

SCHEMATICS ___-____________________________________----------------

Page

37 61

MODEL 616

1LL”STRATIONS

ILLUSTRATIONS

Figure NO.

1 2 3 4 5 6

Front Panel Front Panel Controls Rear Panel Connectors Triaxial Input Typical Display an 1OmV Sensitivity operation as B Voltmeter in NORMAL Mode

Title Page NO.

7 Operation a8 an Arcmeter in NORMAL Mode 8

Loading Effects in Ammeter Function

9 Operation as an Ohmmeter in NORMAL Mode 10 Operation as a Coulombmeter in FAST Mode 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

Null Method for Current Measurement

Volt-Ammeter

Resistance Method Unity Gain (Xl) Measuremene "se of

1V

Recorder Output Front Panel Of Model 6162 Dual Rack Mounting "sing Model 1007 Hardware Rear Panel of Model 616 and 6162 Diagram of b,rerconnecrion Cable between 616

Identification of Pins on Digital Output Connector Suggested Hook-up for Daea Lines Block Diagram of 61616162 System Timing Diagram for 6162 Outputs Overall Block Diagram of Model 616

Simplified Diagram of Amplifier Section Voltmeter Configuration - NORMAL Mode Ammeter Configuration - FAST Mode Coulombmeter Configuration - FAST Mode Ohmneter Configuration - NORMAL Mode Functional Black Diagram of *-m-o colwereer 25 Functional Black Diagram of Large Scale Integrated Circuit DigiLal Display Chassis Assembly - Exploded View BOtfOm cover Assembly Component Layout, PC-321 Gxnpanene Layout, PC-335 Component Layout, PC-322 Component Layout, PC-323 Component Layout, PC-324 Component Layout, PC-325

1 2 3 5 5 7 8

8 10 11 12 12 12 12 13 13 14

and 6162 14

16 18 19 19 21 22 23 23 24 24

26 26 39

39 53

54 55 57 59 60

1175

SPECIFICATIONS

MODEL 616

SPECIFICATIONS

iS AN AUTORANGING VOLTMETER RANGE: $10 microvolts per digit (1OmV full range) eo

Cl00 volts full range in five decade ranges. 100% overranging to 1999 0" all ranges.

KCUPACY (ZO'=C to 30°C): +(0.2% of reading x).1% of

range).

READING TIME: Less the" 4 seconds to within 0.1% of

final reading, except where limited by source char-

acteristics.

ZERO DRIFT: Less than (50 microvol~s M.Ol% Of range)

per 'C. and less than 100 microvolts per 24-hour period after two hours warm-up (during which drift

does "a~ exceed 500 microvolts). IOISE: Cl0 microvolts with input shorted. tNl'UT IMPEDANCE: Greater than 2 x 1014 ohms shunted

by 20 picofarads. Input resistance ms also be

selected in decade see"s from 10 ?o

POR”AL MODE REJECTION RATIO:

FQT voltage of line frequency and se least 10% of full raoge dc reading.

volts peak ac + dc. :OMMON "ODE RWECTION RATIO: Greater than 140 dB af

line frequency with 300 volts peak-to-peek from circuit Lo to chassis ground, up to 1011 ohm source me-

sistance, and se least 10% of full range dc reading. is AN AMMETER ?.ANGE:

range) to to.1 ampere full range in 13 decade

ranges. 100% overranging to 1999 on all ranges. u2cuRAGY (2OY to 30-C):

Range Switch setting AWurecy

YOISE: 2 x lo-15 ampere peak-to-peak on the most sen-

sitive range, exclusive of alpha particle disturbance. ,FFSET C"Rp,XNT: :OMMON MODE REJECTION: 300 volts peak-to-peak ae line

frequency from circuit La eo chassis ground on any range and with at least 10% of full range dc reading will not degrade accuracy more than 0.3% of range.

(Equivalent to 140 dB CMRR).

LS AN OHMMETER WGE: 1 ohm per digit (1000 ohms full range) co 1014

ohms full range in 12 decade ranges. 100% overranging to 1999 on all ranges.

uxxRAm (2OOC to 3ooc):

Range s;*tci seetinp

IETNOD: Two-terminal COnSt*nr--Curre"t. current equals

reciprocal of OHMS range.

RANGE

1OmV

10omv

1V

10 v

100 v

t10-16 ampere per digit (lo-13 ampere full

10-l Co 10-/A

lo-88

10-9 eo lo-1lA

Less than 5 x lo-15 ampere.

103 to lo’&?

lOan

109 to 10120

NMRR 94dB 80dB SOdB 60dB 60dB

Maximum total input 200

k(O.54 of reading +O.l% of range) t(24 of reading +0.1X of range) CO% Of reading +a.l% Of range)

f(0.54 of reading tO.l% of range) C(2% of reading +O.l% of range)

+(5% of reading ffl.19. of range)

I1

10

MAX. AC

2v 2v

2ov p-p 2ov 0-p

2oov p-p

Accuracy

ohms.

e-p p-e

AS A COULOMBMETER RANGE: ?10-15 coulomb ,,er dinit (LO-12 coulomb full

range) to ?10-5 coulo;b fuli range in a decade ranges. 100% overranging to 1999 on all ranges.

ACCURACY (20°C to 3O'C): ~(5% of reading +O.l% of

range) 0" a11 ranges. AS A CONSTANT CURRENT SOURCE RANGE: 8 CurrentS in decade seeps from 10-5 fo lo-12

ampere using OHMS ranges. Hi eermina1 is positive. COmJLIANCE: up to 200 volts. ACCURACY (ZO'C eo 3O'C): 20.5% from 10-5 eo lo-7

ampere. *2% at 10-a ampere. ?5% from 10-9 to

10-12 ampere. LOAD REGULATION:

1011 ohms. GENERAL DISPLAY: 3 digits plus 1 overrange digit; decimal

position, polarity, and overload indicaeio"; 5 readings per second. Depending on sensitiviey setting, 3 least-si~ificant digits blink or blaok

"he" overload condition exists. POLARITY SELECTION: Automatic SENSITIVITY SELECTION: Automatic: Voltage sensi-

tivity selection is fully sutomstic.

selection is a"Wma?Lc hlo decades above and be-

low range switch setting for resistance, charge, and most current measurements. Manual: Front panel switch. Remote: Progrsnmsble with the Model 6162 Output/Control (optional).

ISOLATION:

than LO9 ohms shunted by 500 picofarads (decreasing to lOa ohms at 3O'C and 70% relative humidity). Circuit Lo ma" be floated UD to tlOO0 voles with respect eo chassis ground.

ANALOG OUTPUTS: Unity Gain: For dc inputs, oueput

is equal to input within 20 ppm far oueput cur;e"rs Of 1mA or less. In Jhe fasf mode output polarity is opposite input polarity. up fo 1mA with respect to circuit Lo for full range inwt: 100% o"elxs"!Le caoaLli1iev. I" tile normal mode rhe outpue pol&ity'is oppbsice input polarity

0PEuTING ENVIRONMENT: 20°C eo 3O"C, 0% co 70% re-

lative humiditv. 1O'C fo 5O'C wieh derated soec-

Better than 0.1% for loads up to

sensieiviey

Circuit Lo to chassis ground; greater

1 vo1c: ?l volt at

ifications. s&age: ooc to 70°C.

CONNECTORS:

Analog outputs: Unity gain, 1 volt chassis, Lo. and guard; binding poses. BCD Output: co""eceors for interfacing ?he Node1 6162 Isolated OutpuflConCrol.

DIMENSIONS; WEIGHT: Style M 3-l/2 in. half-rack,

OVer811

15-314 in. deep (100 x 220 x 400 mm); "et weighC, 11 pounds (4,a kg).

POWER:

(switch selected), 50-60 Hz, 9 watts.

ACCESSORIES SUPPLIED: Model 6011 Input Cable: 3 ft.

(lm) rriaxial cable with triaxial co""ector and 3 auigaeor clips.

1npue:

bench size 4 in. high x a-314 in. wide x

Line Operario":

Teflon-insulated trisxial.

1neerna1

go-125 0r 180-250 volts

1

iv

0374

SECTION 1.

GENERAL INFORMATION

l-l. INTRODUCTION. The Model 616 Digital Electrometer is an automatic ranging, multipurpose electrometer featuring sensitivity to 10 microvolts per digit. Its 3-l/2 digit LED display provides 0.2% voltage accuracy for a wide range of measuremente.

The Model 616 is essentially a digital multimeter optimized for measurements from high source impedance. The 616 provides wide range capability when

measuring current, resistance, and charge in addition

to voltage.

1-2. WARRANTY INFORMATION. The warranty is stated an the inside front cover of the manual.

l-3. CHANGE NOTICE. Improvements or changes to the instrument not incoqmrated into the manual

will be explained on a Change Notice Sheet

attached to the inside back cover.

0773

1

GENERAL INFORMATION

MODEL 616

TABLE 1-l.

Front Panel Controls

Control Power ON SENSITI"ITY ZERO RANGE

FAST/NOW ZERO CHECK INPUT

Functional Description Controls line power. Sets voltage sensitivity and decimal paint.

Adjusts zero affset.

Sem range on a chosen function.

Sets instrument for either Feedback or Shunt Mode. Places instrument in ZERO CHECK mode. Triaxial input receptacle.

FAST/NORMAL

ZERO CHECK

Paragraph

--

3-4a 3-4a 3-3

3-7b

3-6 3-2a

s103

I

POWEk

ON

S202

SENSIiIVITY

s401 R119

FIGURE 2.

RANGE

SlOl

Front Panel Controls and Display.

n&AXIAL

INPUT 5120

0773

MODEL 616

TABLE 1-2.

Rear Panel Controls.

Conrrol

Line Switch

1v (RED) 3117

I

Functional Description

Sets instrxment

Mates with 3-wire

117V: 3/16A (FU-29)

234V: l/lOA (FU-40) Unity-gain ouqmt, zoov @ 1 lnA maximum. Recorder Output, 1" @ 1 mA full range. Guard Output. circuit LOW.

Chassis ground.

for nominal

line

cord.

117V or 234V.

Paragraph

2-3a 2-3~ 2-3b

3-2c 3-2c 3-2~ 3-2c 3-2~

-

1175

FIGURE 3. Rear Panel Connecears.

3

INITIAL PREPARATION MODEL 616

SECTION 2. INITIAL PREPARATION

Z-l. GENERAL. This section describes procedures far incoming inspection and preparation for use.

2-2.

INSPECTION.

The Model 616 was carefully inspected both mechanically and electrically before shipment.

Upon receiving the instrument,

check for any obvious damage which may have occurred during transit.

Report any damages to the shipping

agent.

PREPARATION FOR USE.

2-3.

8. Line Voltage.

Before power is applied check the position of the LINE switch (5201) on the rear panel.

50-60

Select the 117V position for operation from

Hz line voltages over the range 9OV to 125"

rms . Select the 234V position for operation fro,,,

50-60

Hz line voltages over the range 1SOV to 250" rms . Line voltages which are not cavered by ranges specified require an appropriate step-up or stepdawn pawer transformer.

b. Fuse Installation.

After the line "alrage range is selected check for the proper fuse type and rating 8% fallows:

117v:

234V:

c. Line Co""ectio"s.

3116 ampere, type 3AG

SLO-BLO (FU-29)

l/l0 ampere, type 3AG SLO-BLO (F"-40)

This instrument requires * three-wire line cord (Keiehley part no. CO-7) which provides connections t" line voltage (high, common) and chassis ground.

For operator safety, the chassis ground pin should be connected to earth ground.

CZ

If the instzxment input LO is to be floated, above chassis ground, make certain that the "link" between LO and GROUND on the rear

panel is removed.

d. Warm-up. The recommended warmup time far the Model 616 is two hours, although if is useable immediately after power is turned on, for less critical meas"reme"ts.

4

1175

MODEL 616

I

OPERATING INSTRUCTIONS

SECTION 3.

3-1. GENERAL. This section describes the procedures for operating the Model 616 for measurement of valr-

age, ~uccent, charge, and resistance. 3-2.

HO" TO MAKE INPUT AND OUTPUT CONNECTIONS.

a. Incut Receotacle. This receptacle is a Teflon insulated triaxial connector. The center terminal is the high impedance input; rhe inner shield is the law inout: and the outer shield ie case ground. The m&n; connector is a Keirhley part "0. CS-141 triaxia1 plug.

b. Model 6011 Input Cable. This cable is a 30 inch long triaxial cable terminated with 3 colorcoded alligator clips. The input high is identified

by the heavy wire with red insulator. The input

low is identified by the thin wire with black in-

sulator. The case ground is identified by the thin

wire with green insulator.

C. Rear Panel Terminals. The rear panel has six binding posts which are used for making special connections to the Model 616.

1. Xl Terminal (White). This terminal provides

an analo,q signal at unity gain. CAUTION Up to 200 volts my be present at this terminal.

2. 1" Terminal (Red).

an analog signal wivh a scale factor of 1 volt far

full range input.

3.

Lo Terminals (Black). These terminals provide a connection to input low. terminal may be used for system connections.

GUARD

4.

vides a connection to the amplifier feedback when in the FAST made.

5. GROUND Terminal (Green). vides a connection to chassis ground. A shorting link is provided for easy connections between lo" and chassis. For floating applications, the link must be removed.

Terminal (Blue). This terminal pro-

This terminal provides

Either

This terminal pro-

OPERATING INSTRUCTIONS

3-3.

HOW TO SELECT FUNCTION. a sinele front-"anel rotarv switch for selection of function and range. manual selection of any of four functions, namely,

VOLT, OHMS, COULOMB, and AMPERE.

3-4.

HOW TO "SE THE, VOLT FUNCTION. provides five decades of voltage sensitivity from

.OlOOO volts to 100 volts full range. The VOLT func-

tion is selected by setting the RANGE switch to VOLT.

a. Manual Sensifivity Setfin~s. The front panel SENSITIVITY switch has six positions. ks the switch is rotated counter clockwise, the sensitivity is

increased.

sensitivities of lOO.OV, lO.OOV, l.OOOV, .lOOOV, and

.OlOOOV as in Table 3-1. AUTO sensitiviry mode which enables either *"tomatic sensitivitv or remotely selected sensitivitv

(when used with the Model 6162). See paragraph 3-4~ for a complete explanation of

Senslriviey

Setting

I

10 nlv

100 nlv

10 1v v

100

*The display indicates OOO.OV at 200.0 volra input.

The three least significant digits will flash on

and off (blinking action) to indicate an over-

voltage condition.

read up to f201.7 volts with blinking action. Beyond f201.7 "olts the display will indicate 001.7 volts with blinking action.

Valtaae inputs ,q.reater than f200 volts are not r;comm&,ded-since damage to the instrument may result.

These positions correspond to full range

Voltage Sensitivity Settings

" 100.0 199.9 v*

The RANGE Switch (5101) permits

TABLE 3-1.

Full Range Maximum

Display Display

.01000 v .lOOO v f .1999 v

1.000 10.00 v V v f i f 1.999 19.99 v v

The display will continue to

The Model 616 provides

The Model 616

Position six is

AUTO

mode.

f .01999 v

the

0774

GROUND

FIGURE 4. Triaxial Input.

POLARITY ZERO

DUMMY

1, -

DECIMAL--I

FIGURE 5.

Typical Display on 10 mv Sensitivity.

3 DIGITS

LOVER-RANGE

5

OPERATING INSTRUCTIONS MODEL 616

b. Automatic Sensitivity Operation. In the AUTO mode, the Model 616 automatically selects the proper sensitivity in accordance with the following

rules.

1. Upranging. If the display reading is between O-l-S-0 and l-9-9-9 and the i""ut siwal is increased beyond l-9-9-9, the Model 616 auto-

matically up-ranges to the next higher (less sensitive) range.

The three least significant

digits sre blanked during range changing so ss

to prohibit incarrect readings from being dis-

played.

If the input signal exceeds t199.9 volts

the display will continue to indicate up to f201.7

volts but the three least significant digits will

flash on and off to indicate an over voltage condition.

2. Down ranging. If the display reading is

~-

at least O-I-S-O and the input signal is decreased,

the Model 616 automatically down ranges to the next lower (mare sensitive) range.

C. Remote Sensitivity Selection. When the Model

616 is used with the Model 6162 Isolaced 0uc"utl

. Control, the 616's voltage sensitivity may be cemerely selected.

The output connector on the rear panel of the 6162 provides four isolated control lines for the purpase of remote sensitivity progr*""i.*g.

3-2.

The lines are coded as shown in Table

The 616's front panel SENSITIVITY switch

must be set t" AUTO position.

TABLE

3-2.

Remote sensitivity Programmi"g Logic

Sensitivity

Control Lines

&CR*

K4

R2

Kl

I .01000 " .lOOO v

1.000

10.00

100.0

I: ", : :

” 1 0 v : 1 1 0' " 0 1 1 1

*NOTE

The Manual Range line MR is used to defeat the automatic sensitivity feature. When MR is open, the 616 returns to s"tomatic operatian. Logic 1 - open, Iogic 0 = closure to ground.

3-5.

PO" TO SELECT RANGE ON OHMS, COULOMB, AND AMPERE. The front panel KANGE switch (SlOl) provides selection of four functions, VOLT, OHMS, COULOMB, and AMPERE as

described in paragraph 3-3. For each function, a wide selection of ranges is provided; 8 ranges on

OHMS,

4

ranges "n COULOMB, and 11 ranges on AMPERE. Since

the SENSITIVITY switch is used in conjunction with the RANGE Switch, the actual number of usesble spans

is 12 decades on OHMS, 8 decades an COULOMB, and 11 on AMPERE.

NOTE (ON AMPERE FUNCTIONl On the 10qlA t" 10~4A ranges, the voltage beveloped must not exceed 2 volts, otherwise, overheating of s range resistor could result. As s result,

the

10 Volt and 100 volt sensitivity settings ate not recommended for lo-l1\ to

1O-4A ranges.

TO interpret a reading an OHMS, COULOMB, or AMPERE ranges both the digital display (with decimal location) snd the RANGE setti"g(powers of ten)shauld be cansidered.

For example, given a digital reading of 17.32 and a RANGE setting of 1O-7 AMPERE, the actual measured value would be interpreted ss 17.32 x lO-7

ampere.

Since the decimal point is moveable, it is important

to notice the position of the demimal point to determine the full range of the instrument. See Table 3-3 for typical range settings in the AMPERE function.

TABLE

3-3.

Typical Current Range Settings*

Input Range Se"Siti"ity Digital

current setting setting Display

*The current reading is interpreted by multiplying the display reading times the range setting. Other cucrents not show" can be measured by selecting the sppr"priste RANGE switch setting in decade steps from lo-1'A to lo-lA.

3-6.

HOW TO MEASURE VOLTAGE. The Model 616 can be used to measure voltages from ilO microvolts to i200 volts.

Although the Model 616 is useable as a gener-

al purpose digital voltmeter, it has certain charac-

teristics which enable reliable meas"rement~ from very-high source resistsnces. When used in the VOLT mods, the M el 616 has B" input resistance greater than 2 x 10%.

As a result, the loading of the source circuitry is relatively insignificant when compared to typical digital voltme-cers having LOS ohms input resistance. The Model 616 has 20 picofarads of shunt capacitance (not including the input cable capacitance),

since a large *"o""t Of capaci-

tance causes a slowing of response, the input capaci-

ty ,shauld be kept 8s small as possible.

a. Measurements From Very High Source Resistance. TO "se the Model 616 as a voltmeter, set the front pane1 controls as follows:

RANGE

-- VOLT SENSITIVITY -- AUTO FAST/NORMAL -- NOW

Connect a Model 6011 Triax Cable (or other shielded triaxial cable) to the INPUT receptacle. Keep cable length as short as possible to reduce the slowing effects of cable capacitance. The ser" control may need occasional adjustment to reduce any voltage offset which msy occur due to temperature variations.

To

resero the Model 616, set the ZERO CHECK switch to CHECK position and adjust the front panel ZERO control for a O-O-O-O display.

The Model 616 pravides a direct reading voltage display with automatic decimal point position and polarity.

6

0476

OPERATING INSTRUCTIONS

I

---------_ SOURCE

b. Measurements From Low source Resist.a”ce. TO "se the Model 616 for voltage measurements from low ~our'ce resistances, set the RANGE switch to the lo-l1

AMPERE position. In this mode, the Model resistance is reduced to 1011 ohms; as a result the electrometer will be lees sensitive to electrical noise pickup and input cable vibration. Voltage measurements can be made by following the same procedure given in paragraph 3-6a. The Model 616 can be used with the RANGE eet et any position be-

tween 10-11 AMPERE to 10-l AMPERE.

input resisLence can be determined by taking the reciprocal of the AMPERE setting. Significant loading error may result if the input reeisrsnce 18 reduced to less than 100x the source resistance.

C. Measuremenrs Above 200 Volts. The Model 616

can be used with accessory divider probes to measure

voltages up to 30 kilovolts. Range muse be set to VOLT.

1. Model 6102A Divider Probe (1O:l). This accessory extends the voltage mesauring capability of the Model 616 to 1000 volts. The inpa resistance is lOlo ohms. to 1000 volts. ory Model 6012 Adapter is needed LO mete the triaxial input with the UHF connector a" the probe.)

2. Model 6601A Divider (1OO:l). This accessory

extends the voltage measuring capability of the

Model 616 to 5000 volts. The input resistance is

lo7 ohms. The divider accuracy ia +0.01X.

3. Model 6103A Divider Probe (1OOO:l). This accessory extends the voltage measuring capability of the Model 616 to 30 kilovolts. The input resistance is 10" f5% to 30 kilovolta. an accessory Model 6012 Adapter ie needed to mate the triaxial input with the "HP connector on the probe.)

The divider accuracy is +4%

(To use the Model 6102A en acceee-

ohma.

The divider accuracy is

(To

uee the Model 6103A

i

ERROR DUE TO CIRCUIT LOADING

% ERROR =

616 input

The Model 616

100 R

R + RIN

-----------------’

I

ELECTI(OMETER

The Model 616 may exhibit a large amount of zero offset or drift immediately after an

overload or e long period of storage. I" addition, the offset current may exceed the

specification for a short time until the Model 616 ia sufficiently stabilized. Although the offset current of the Model 616

is well below offset found in conventional voltmeters, the effects of the offset current charging the input capscitance may be "ociced when the input is open. "se the ZERO CHECK switch to discharge the offset charge.

The Model 616 should "ot be operated with circuit low fleeting by greater than 1000 volta

with respect to chassis ground.

616 is to be used with circuit low floating

make certain that no connection is made be-

tween the LOW and GROUND terminals o" the

rear panel.

corder or other instrument to the Xl or 1V

outpute when the Model 616 is floated.

d. Voltage Measurements in FAST Mode. when the FAST/NORMAL Switch is eet to FAST, the Model 616 is connected in a "FEEDBACK" amplifier configuration. In this configuration, the Model 616 requires special connectians. between input HI and GUARD. A" easy way to accomplish this connection ie Lo connect the link (on the rear panel) between "GUARD" (blue terminal) and "GROUND" (green terminal). Then uee the rriaxial cable far input connectione with the input voltage

applied between the "red" clip lead and the "green" clip lead.

In this special voltage connection, the LO input (black clip lead) is "of used since the voltage amplifier Configuration has bee"

changed.

Do not connect a grounded re-

To measure voltage, co~ect the eource

NOTE

If the Model

1175

7

OPERATING INSTRUCTIONS

c------c--

l l

R R

I I

II--, II--,

I I

------F----------

l

MODEL 616

I I

MEASURING MXASURING

POINTS POINTS

I I I I

- -

i i

T T

: :

--WC---- --WC----

L L

; ; I I

_I’ _I’

SOURCE SOURCE

P1G"P.E 7. PICURE 7.

HOW To MEASURE CURRENT. The Model 616 can be

3-7. wed to measure currents from *lo-15 ampere to 200 mill***peres. a general purpose picoammerer, it has certain charac-

teristics which enable reliable measurements of very

small current8 with fast response.

a. Normal Mode Current mode for current below lo-5A.) I" this mode, the Model 616 measures current "ver a wide range. When

the FAST/NORMAL switch is set to NORMAL, the Model 616 operates as a shunt-type picaammeter in which a resistor is connected directly across the input terminals. acro.m the shunt resistors where VIN - IIN x RS. This method of measurement is typical of 'mast multimeter current measuring techniques. To use the Model

616 as a shunt-type pidoammeter, eat the front panel controls *s fallows:

RANGE

SENSITIVITY -- AUTO

PAST/NORMAL -- NORMAL

Full range is determined by the

sensitivity setting and the AMPERE range setting.

Connect a Model 6011 Triax Cable (or other shielded eriaxial cable) to the INPUT receptacle. Keep cable length as short as possible to reduce the slowing effects of cable capacitance. The zero control may need occasional adjustment to reduce any voltage

offset which may occur due to temperature variations. To rezer" the Model 616, set the ZERO CHECK switch to CHECK position and adjust the front panel Zero control for a O-O-O-O display.

Although the Model 616 is useable a8

Measurements.

The Model 616 measures the voltage drop

-- 10-5

AMPERE (or appropriate range)

NOTE

-

operation As A" hater in NORMAL Mode. operation As A" hater in NORMAL Mode.

(Use FAST

L1-__------------! L1-__------------!

ELECTROMETER ELECTROMETER

” = I x Rm ” = I x Rm

The Model 616 may exhibit a large em"u"t of

zero offset or drift immediately after a" overload or a long period of storage. I" addition, the offset current may exceed the specification far a short time until the Model 616 is sufficiently stabilized. Al-

though the offset current of the Model 616

is well below offset found in conventional voltmeters, the effects of the offset current

charging the input capacitance may be noticed when the input is open. Use the ZERO CHECK

switch to discharge the offset charge.

Do not use the 10 volt and 100 volt aensi-

tivity settings for RANG? switch settings of LO-~, 10e2, 10v3, and 10e4 ampere. the voltage ekeeds~2 volts on these ranges, averheating of the resistors could result

with subsequent degradation of accuracy in

the AMPERE mode.

If

0476

MODEL 616

OPERATING INSTRUCTIONS

b. Fast Mode C rrent Measurements.

currents from 10 A and smeller.) In this mode, the

-s

(Useable for

Model 616 measures very amall currents with fas; response. When the FAST/NORMAL switch is set to FAST, the Model 616 operates as a feedback-type picaammeter in which the current flows through the feedback resistor of the voltage amplifier. The Model 616 indicates the voltage developed across

the range resistor where VF =

method of measurement provides

I

Es: ~~p0~8*since

the effect of the input capacitance from lengthy

cables is diminished.

To use the Model 616 as a feedback-type picoammerer, set the front panel controls *s follows:

RANGE

-- lo-l1 AMPERE

SENSITIVITY -- AUTO

FAST/NORMAL -- FAST

Connect a Model 6011 Triax cable (or other shielded triaxial cable) to the INPUT receptacle.

The zero control may need occasional adjustment to reduce any voltage offset which may occur due to temperature "S.***t*O~S.

To rezero the Model 616, set the ZERO CHECK switch to CHECK position and adjust the front panel ZERO control for a O-O-O-O display.

The Model 616 may exhibit a large amount of

zero offset or drift immediately after an overload or a long period of storage. In addition, the offset current may exceed the

specificarion far a short time until the

Model 616 is sufficiently stabilized. Al-

though the offset current of the Model 616

is well below offset found in conventional voltmeters, the effects of the offset current charging the input capacitance may be hoticed

when the input is open. Use the ZERO CHECK

switch to discharge the offset charge.

2) Considerafions~When

Measuring

C&rent. 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-

tance for a picoammeter.

Fir*t, small value resistors are of higher quality compared to large values with respect to accuracy, time stability, temperature. and voltage coefficient, Second, ideal picoammeters require very small input resistance so that source loading does not affect the overall accuracy of the measurement.

Since the input resistance

in a shunt picoammeter is determined by the range resistor, the RANGE multiplier should be set at the lowest value.

Third, the use of a low value resis-

tor reduces the input RC time constant and results

ln faster response.

Harever, since noise and zero

irift become more significant when the voltage

unplifier sensitivity is set to 10 or 100 millivolts,

the appropriate range multiplier should be selected

with a one volt full scale sensitivity. The use of

the Model 616 in the FAST made enables measurements of very small currents while reducing the source loading and input RC time constant. Since the range resistor is connected in the feedback of the voltage amplifier, the effective input resistance is determined by the open-loop gain where SIN = RF t A.

(The value of A is typically 10,000.) Another advantage of the feedback mode is the reduced effect of input capacitance since the input SC time copstant is decreased by the gain A (RCeFpECTIVE = RC i

As a result, the measurement speed is governed

A).

by the feedback time constant which is a function

of the feedback resistor and stray capacitance acT088 the resistor (usually a few pF). Thus, when comparing shunt versus feedback modes, it is evident that the feedback measurement offers superior performance for most applications.

TABLE 3-4.

HOW TO SELECT APPROPRIATE AMPERES RANGE.

urrent To

a Measured

lo-15A 10-14A lO:;;A 10 A

;;I:~

Range

Setting

10-11 g::: 10-11

$"

LO-' A

,ppropriate

LO-' A lO-7 A 10-6 A 1O-5 A

10-e 10-7

lo-6

10-5 1O-4 A 10-4 lO-3

A

10-3 1O-2 A 10-2 10-l A

10-l

Appropriate Sensitivity

Setting

10 In" 10 In" 10 mv

100 mv

1" 1v 1v 1" 1v 1v 1v 1v 1v 1v 1v

NOTE

-

.OOOlO x lo-1lA .OOlOO x 10-llA

:;;;p,xl;";:';

;:g; : ;$ ;

1.000 x lo-' A

1.000 x lO-8 A

1.000 x lO-7 A

1.000 x

lo-6

1.000 x 10-S A

1.000 x 10-4 A

1.000 x 1O-3 A

1.000 x 1O-2

1.000 x 10-l A

The we of the FAST mode for current measurements is subject to certain restrictions ae follars:

1. The range resistor value should not be greater than the source resistance, otherwise feedback division results in zero instability at

the output.

2. The largest value of current measured should not exceed 10e5 ampere, otherwise the full feedback current cannot be developed. The NORMAL mode should be used for currents from 200 mA to 10-4A.

A

3476

9

OPERATING INSTRUCTIONS

MODEL 616

r---------m

-1

I I

MEASURING

I %

I ..----,---,I

SOURCE

FIGURE 9.

3-8. HOW TO MEASURE RESISTANCE. be used to measure resistance from 1 ohm to 2 x 1014 ohms. Although the Model 616 is useable as a general purpose ohmeter, it has certain characteristics which enable reliable measurements of very large resiseances with fast response.

Up to 250 volts may be present at cerminale.

a. Normal Mode Ohms Measurements. Model 616 measures resistance over a wide range. The use of the NORMAL mode is recommended for measurements up to 1O'l ohms (use the FAST mode for larger resis-

tallces). The Model 616 uses a constant current method for measuring resistance. 16 proportional to the voltage developed across the

input terminals.where V = I x R (the current I is selected in decade steps using the RANGE Switch). To use the Model 616 as an ohmmeter, sac the front panel controls 88 follows:

RANGE

SENSITIVITY -- AUTO

FAST/NORMAL -- NORMAL

e***t**ce to

be Measured

lOl$ 1012n IOllQ $0;

109 0 108 n 10' n 106 n lo5 n 104 n 103 n lo2 n

-- 105 OHMS (or other appropriate range)

HO" TO SELECT APPROPRIATE ONMS RANGE.

Lppropriate

14

CAUTION

There, the digital readout

TABLE 3-5.

Range

Setting

;;::

1012 1011 1010 109 108 107 106 lo5 105 105 105

The

1v 1.000 x loL"n 1 " 1 v 11.000 1v 1.000 x 10' n 1v 1.000 x 106 n 1v 1.000 x 105 n 1 " .I""" x n 104

Operation As An Obrmneter in NORMAL Made

Model 616 can

In this mode, the

1.000 x log n x 10: n

x 1030 x 1o‘al

.--------------m-w.

INPUT

L---,--- ------ --,I

ELECTROMETER

" = I x Rx

Connect a Model 6011 Triax cable (or other shielded triaxial cable) to the INPUT recept&le. Keep cable length as short as possible to reduce,the slowing effects of cable capacitance. The zero control may need occasional adjustment to reduce any voleage offset which may occur due to the temperature "aria-

thl*.

switch t-0 CHECK position and adJust the front panel ZERO control for a O-O-O-O display.

Model 616 meaeures very large resistancea with fast

y$a

FAST, the unknown resistance (Rx) is floating with respect to the low side of the voltage ampli-

fier. feedback so as to reduce the effects of capacitance and therefore speed up the measuring time. TO use

the Model 616 for FAST ohmmeter measurements, see

the front panel controls as follows:

Connect the unknown resistance between input HI and

GUARD (on the rear panel).

I

To rezero the Model 616, set the ZERO CHECK

b. Fast Mode Ohms Measurement. In this mode, the

onse (use this mode for resistances larger than

ohms). When the FAST/NORMAL switch is set to

The unknown resistor is connected across the

RANGE -- 1012 OHMS SENSITIVITY -- AUTO FAST/NORMAL -- FAST

When the FAST mode is used for resistance measurements, the unknown resistance sample is connected in feedback around the electrometer amplifier.

floating and not referenced to LO.

Therefore the resistance must be

I

10 0476

r---------1

I

CHARGE

TRANSFER--t,

I I

n

,m----------- -----,

, INPUT

I

I +

' %/ I

I b---m-----?

3-v. HOW TO MEASURE CHARGE. The Model 616 can be

SOURCE

I

I I

I

MEASURING

POINTS

&

used LO measure charge by means of a current integration technique.

anyone of the 4 coulomb ranges, an accurately known

"hen the Model 616 is set to

capacitor is connected in the feedback loop of the voltage amplifier so chat the voltage developed is ~oportional to the integral of current where V =

'C or V = l/Ciidt. To use the Model 616 as a coul-

ombmeter, 8et the front panel controls as follows:

RANGE -- 10-10 COULOMB SENSITIVITY -- AUTO

FAST/NORMAL -- PAST

Connect a Model 6011 Triax cable ("r other shielded Lriaxial cable) to the

INPUT

receptacle. Keep cable length a8 short as possible to reduce the slowing effects of cable capacitance. The zero control may need occasional adjustment to reduce any voltage offset which may occur due to the temperature variatiO"S. To rezer" the Model 616, set rhe ZERO CHECK Switch t" CHECK position and adjust the front panel ZERO control for a O-O-O-O display.

NOTE

-

The input offset current of the Model 616 contributes a charge of 5 x lo-15 coulomb per second and should be subtracted- from

the actual reading.

The Model 616 can also be used with acces-

sory Models 2501 or 2503 for measurement af

static

charge 0" a dielectric surface.

A

discussion of static charge measurement is given in secrion 3-lla.

For m"re information about Static Charge

Measurements, request the Keichley PrOduct

Notes entitled "Electrometer Static Charge

Measurements”.

i

,Lc

I .-.------------____,

3-10.

HOW TO "SE AS A CURRENT SOURCE. The Model 616

ELECTROMETER

v = l/C /i dt

I

can be used as a current .s"urce for currents in decade increments from 10-5A t" lo-12A. TO select cur-

rent, set Model 616 to OHMS function. set OHMS range

to the appropriate position as show" in Table 3-6.

"se NORMAL mode for currents up to lo-loA, and FAST

made above lo-loA.

TABLE 3-6.

' Current Desired

lo-=A lo-"A 10-lOA lo-' A 10-S A 1O-7 A 1O-6 A lo+ A

OHMS Range

12 1011n $10;

IO9 n 1oS n 107 R 106 n lo5 R

When input to Model 616 is not connected, set Zero Check Switch t" CHECK. If no inp"f connection is made a large voltage

(up to ZOOV)

can appear across the input.

3-11. ALTERNATE MEASUREMENTS. The Model 616 can also be used with Keithley accessories which ex-

tend the measuring capabilities of the electrometer.

Static Charge Measwement~. The Model 616

a. can be used with Models 2501 or 2503 Static Detector Probes far measurement of static charge on a dielectric surface. When using this method, the Model 616 is operated as a voltmeter with a reading directly in volts.

(Do not attempt t" measure static charge

with the Model 616 in the COULOMB mode.)

1476

11

OPERATING INSTRUCTIONS

7’

L,

MODEL 616

I-

1

FIGURE 11.

b. Null Method for Current Measurements. The

Model 616 can be used with a" accurate current

source such as Keithley Model 261 t" measure small variations of current. When using this method,

the Model 616 is operated BB a current null detector

in the FAST mode.

justed to obtain a null reading "n the Model 616

(the electrometer shauld be set t" a" appropriate

range and sensitivity depending on the magnitude of

current variation).

Null Method far Current Measurement.

The current source should be ad-

I

C. volt-Ameter Resistance Measurements. The Model 616 can be used with a" accurate voltage source such as Keithley Models 240A, 244, 245, or

246. When using this method, the Model 616 is operated as a picaammeter so that the current through the unknown resistance is measured by the electrometer. terms of the knaun voltage impressed and the resultant current measured "n the electrometer.

Volt-Ammeter Resistance Method.

The resistance is then calculated iz

1 " OUTPUT = FULL RANGE INPUT

LO +--l--sJ

i LINK

CASE VC;;SE

FIGURE 14.

"se of 1V Recorder Output.

1

3-12. provides several outputs far monitoring a" analog signal.

used for monitorina the input sinnal in applications requiring a buffer-amplifi&. -

12

HO" TO "SE ANALOG OUTPUTS. The Model 616

a. Xl Output (Unity Gain). This ""tput can be

1. NORMAL MODE.

at the Xl OUTPUT (with respect to LO) is equal to

the input within 20 bpm at dc. The Xl OUTPUT can

deliver up tcJ 1 milliampere for Outputs up to 200

volts.

2. FAST MODE.

terminal is connected t" input LO. applications when inFAST mode the GUARD terminal should be used. current ranges is show" in Table 3-7. This data *a representative of instrument respanse for unity gain operation.

In the NORMAL MODE, the signal

In the FAST MODE, the X1 OUTPUT

For unity gain

Typical rise times for various

TABLE 3-7.

:sponse at GUA

Range

setting

.- .

*'ryplcal 1*strume*t perrormance <may vary tr"m unit

to unit).

b. 1 VOLT OUTPUT.

analog Output at up to,1 milliampere corresponding

to * full scale input.

RD (Unity Cain) OUTPUT for Fast Curre"

Rise Time

This "utput pravides a 1 volt

lo-90%

0774

MODEL 616 OPERATING INSTRUCTIONS

3-13.

provides isolated BCD outputs, remote controls, and remate pragramming lines for systems we of the Model

616. farmatian provided in parallel format. Strobe lines permit data transfer in 4 bit multiples which are

compatible with 8, 12, or 16-bit data eyeterns. Strobing of the “open collector” wtpute also permit multiplexing of data from 2 or more 6162’8 an e single data bus. l/5 second to 7 seconds per reading to permit a wanefer rate compatible with the speed of measurement end/or the acquigition system.

trole are provided for Zero Check, Sensitivity, Dfsplay Hold, Output Hold, ae well ae Strobe. The 616’s

low to chessis ground ie018tion is maintained by the 6162 (greater than lolo ohms). Digital w&put lcw

is also isolated from chassis ,ground by 10 ahme.

a separate 3-l/2 in. high half-rack chassis. be used on the bench adjacent to the 616 or reck mounted side-by-side in a standard 19 inch rack width using rack hardware provided (Model 1007).

HOW TO USE MODEL 6162.

8. General.

The Made1 6162 has 32 bite of meaeurement in-

Installation.

b.

Bench Mounting. Position the Model 6162 on

1. the left side of the Model 616 as shown in Figure 19 since the intercanneoring cable has been desighed to mate with the 616 in this configuration only. the sides which are adjacent. Loqeen the socket

head screw (Item 24) and elide the panqle to the

rear of the instruments. After both panels are remaved install the “mounting clamp” (Item 23)

Remove the “side dress” panels (Item 11) on

The Model 6162 Isolated Output/Control

Print rate can be adjusted from

Isolated Remote Con-

The 6162 circuitry is housed in

*e can

FIGURE 15.

using the original hardware. Remove two ecrewe

on one of the instruments and insert the mounting

clamp behind the corner bracket ae shown in Figure

17. Replace and tighten the two ecrewe to hold the clamp in place. the clamp behind the corner bracket on the second

i*stTXlE*t. Attach a l-l/L?” long Phillips head

ecrew (Item 25) and kepnut (Item 26) to secure the two instruments together.

2. Rack Mounting. Proceed 88 described in the

above paragraph for bench mounting. The,, attach a,, “angle bracket” (Item 21) on each instrument using hardware (Item 22) in place of original hardware. The battam corner feet and tilt bail assemblies may be removed if necessary. The original hardware, side dress panels, feet and tilt bail aeeemblies should be retained for future conversion back

to bench mounting.

Front Panel af Model 6162.

Next, insert the open part of

FIGURE 16.

Dual Rack Mwnting Ueing Model 1007 Hardwarr.

OPERATING INSTRUCTIONS

MODEL f

c. Connections.

FIGURE 17.

A single prewired cable plugs

Rear Panel of Model 616 and 6162.

e.

Summary of Digital Information. Table 3-10 into the 616's chassis to provide all necessary identifies the data lines available et the 6162 communication between units. To install the cable, remove the 616's top cover, place rubber grommet

output connector.

The data ia grouped in 4-bit

bytes with a corresponding Strobe line. The strob within the rear panel slot, insert cable, and plug (or enable) line permits serial data transfer from the three mini-connectors into their respective pc-board locations as shown in Figure 19.

A separate

a single 6162 or multiplexing of the data output o

a number of 6162's anta a common data bus. Conven 50-pin AMP type 205211-l connector provides isolated tianal parallel data transfer is obtained when all outputa and control lines. A mating 50-pin connector is furnished with the 6162 (Keithley Pare No. CS-271).

d. Power Requirements. The 6162 is powered from

50-60Hz line voltage and has a separate power switch

and fuse. Line voltage is selected using the rear

panel switch. Fuse type is 3AG SLO-BLO, l/SA.

strobe lines are at Logic "0" (closure to output L

within 0.5 volt).

f.

Print Rate.

The basic 616 has a reading rat of 5 readings per second. The front panel RATE control on the 6162 varies the print rate in l/5 second increments.

INTEKCONNECTION CABLE

REAR PANEL MODEL 6162

10 PIN CONNECTOR PIN ., ON THIS CONNECTOR IS OPEN (NO CONNECTION)

10 CONNECTOR

PIN B ON THIS CONNECTOR IS OPEN (NO CONNECTION)

14

10 CONNECTOR

5 PIN

CONNECTOR

PIN C ON THIS CONNECTOR IS OPEN (NO CONNECTION)

10 PIN CONNECTOR

IS OPEN (NO CONNECTION)

FIGURE 18. Diagram of Interconnection Cable Between 616 end 6162.

05

MODEL 616

OPER&NG INSTRUCTIONS

SPECIFICATIONS; MODEL 6162

TABLE 3-8.

IIGITAL OUTPUT: BCD (8421) open collector logic re-

presente each Of 3 digits (0 = "OOOO"), overrange digit, uprange ("O"), palarity (+ = "l"), decimal position (5 lines), exponent (5 line, BCD), exponent polarity (+ = "I"), downrange ("O"), zero check

("I"), and function (2 bit code).

rCCURACY :

quiva1ent to 0.1% of range).

QAG (FLAG): Logic "1" ("0") from 50 milliseconds to

fl digit with respect to 616 display (e-

-

7 eeconde depending a" Print Rate setting. No change in Digital Output is made during this interval.

l"TP"T LOGIC LEVELS:

0"tp"f Logic "1" : open collecear to autput La. output Logic "0" : closure to output LO.

Output Device: MC858P or equivalent

(greeter than 6V breakdown, 0.5V et +35mA sink).

!S-fOTE CONTROLS:

Zero Check: Logic "0" act"ates 616 Zero Check. Sensitivity: 4-line code far remete eeneitiviey

setting of 616.

Display Hold: Logic "0" retains last reading on

display (except polarity).

Output Hold:

Logic "0" retains data from last read-

ing at Digital output.

Strobe: 8 lines for seriaIizing in multiples af 4

bite.

Logic "1" inhibits controlled output lines.

CONTROL LOGIC LEVELS: Logic "1" = either a" open

circuit or a voltage between +2 and +12 volta re-

ference to autput LO. Logic "0" E closure to ouep"f Lo within 0.5 volt while sinking 2.5 milliamperes.

PRINT RATE: Variable via front panel control from

l/5 second per reading to 7 seconds per reading in l/5 second increments.

ISOLATION:

Input LO to output Lo: sufficient to maintain 616 isolation specifications except adds 200 picofarads capacitance. Output Lo to chassis ground: farad.

greater than lo* ohms shunted by 0.1 micrc

Input may be floated up to flOO0 volts with respect t0 chassis grand. Output Lo may be flaated up t" tlO0 volts with respect LO chassis ground.

CONNECTORS:

Input: Attached cable cennecte a, 616. Output: 50-piq AMP type 205211-l. Mating co""ectar supplied.

ENVIRONMENT: Operating:

10°C t0 5ov, 0% to 70% re-

lative humidity. Storage: O'C to 70"~.

POWER:

90-125 or 180-250 volts (switch selected),

50-60 Hz, 9 watts.

DIMENSIONS, "EIGHT: Style M 3-l/2 in. half-rack,

overall bench size 4 in. high x B-314 in. wide x

15-314 in.

deep (100 x 220 x 400 mm). Net weight,

7 pounds (3,2 kg).

ACCESSORIES SUPPLIED: Model 1007 Dual Rack Ma,neing

Kit.

8. Da.8 Transfer.

Conventional parallel data

transfer is accomplished through parallel connections

with one bit of information per conductor.

Serobing allows data to be grouped into word lengths (bytes) appropriate te the acquisition device. thus simpli-

fying the interfacing between the 6162 and 8, 12, or

._..

lb-tat devlcee. when a11 STROBE lines are at Logic "0". the 6162 data outputs are enabled end ere sveil-

able in parallel farm. Individual strobe lines may be used to c~nlect te e cemmen data bus in multiples of l-bit words.

The 6162 "open-collector" ~utpute

are "open" unless the respective strobe lines ere at Logic "0". The uee of "open-callactor" configuration allawe the parallel connection of 2 or m"re

6162 unite since none of the outputs will conduct unless strobed. The 6162 wtpute ere TTL and DTL compatible.

The "open callectar" output switches between a high and low impedance level rather the" specific voltage levels. determine the voltage level defined by logic state

,tl,,

The output "1" etete may be selected fram any

.

This permits the ueer to

voltage over the range of +2 and +12 volts. The "0"

state is 0.5V et +35 m.4 (maximum)sink current.

h. Word Sequence. The pa,rticular sequence in

which the worda appear in serial data transfer is

determined by the way the "STROBE" lines are grouped and the order of ectiveti"", in addition to the

wiring of the data blocks.

i. Control Features.

1. Flag (m. This eutp~t provides a lagic

level which ce" be used to indicate the proper

time interval for transfer of data. A logic "1"

~ccure from 50 milliseconds ta 7 seconds depending

on the Print Rate contra1 setting. Na change in the Digital Output is made during this interval. On some digital devices, it may be necessary to trigger off the leading edge of the Flag or Flag

-

waveform by differentiating or other wave shaping.

2. Display Hold.

This control line retains the last reading on the display (except polarity) when closure is made te digital LO (Pi" 4). Neither the a/d conversion "ar digits1 wtput ere affected by fhie control.

3. Output Hold. This control line retains the

last reading et the Digital Output when closure is

made to digital LO (Pin 4). Neither the a/d converaia" nor digital display ere affected by this

control.

4. Zero Check. This contra1 line e&uetee the 616's zero check solenoid to permit monitoring of the electrometer amplifier offset. When the line ia released (Logic "1") the 616 returns te "o-1 operating canfigl+ti0n. ~The front panel ZERO CHECK awitch muet be set te OFF position te penoit remote zero check control.

j. Remote Programming. Remote lines ere provided at the 50-vi" connector to Kermit rem"te selection of se"sit&ty over five decedes. When the 616's

SENSITIVITY Switch is eet to

AUTO

position, the seneitivity may be remotely programmed or allared to function automaticslly. When the MANUAL RANGE line on the 6162 is et Logical "0" the coded range lines are enabled, and the LSI range linea ere disabled.

1175

15

OPERATING INSTRUCTIONS

MODEL 616

N8”e

Strobe Ul Fl

F2 EXP POL

EXP 1 x lo1

1 x 10' 17 2 x 100 12 4 x 100 11 8 x 10' 16

1 x 102 30 2 x 102 25 4 x 102 26 8 x lo2 24

Strobe #6

Pin No.

I

48

I

19 Buffer Control

I

DR UR 9

I

a

Cross-Reference for Digital 0utp"ts.

Remarks

Buffer Control Coded function lines

See Table 3-12

t

Logic "1" - +

Buffer Control

Used on OHMS, AMPERE,

COULOMB ranges

Buffer control for

Data 111

I

Data 111 (BCD)

t

Buffer control for

Data 112

Data 112 @CD)

t

Buffer control for

Data u3

Data #3 @CD)

t

Dmm Range

UP Range

TABLE 3-9.

Strobe #7

FLAG FLAG

Strobe 88 Zero Check

1 x 103 POLARITY DPl

"0" (10 mv range)

Strobe 1/9 39 DP2

DP3 5 DP4 6 DP5 23

The following are not strobed.

Output Hold

Display Hold

MANUAL RANGE

3 32

R2 14

84 33

Digital Lo

Zero Check

Name

Pi" No.

3

27 10

20 13

21 43

4:

22

2

50

I

31

4

15 Remote Control

Buffer Co"rrol Timing OUtput

Timing Output

Buffer Control

Indication overrange output Logic "1" - +

Dummy Zero

Buffer Control

Remote Control

sensitivity lines

-See Table 3-13

Ground Reference

Remarks

.ooooo- 10 m"

.oooo= 100 "V o.ooo- 1 " oo.oo= 10 " ooo.o- 100 "

16

FIGURE 19.

Identification of Pins O" Digital Output Connector.

0476

MODEL 616

OPERATING INSTRUCTIONS

--.

Pi" N,

0. Name I

1

2 3 4 5 6 7 8 9

10

1%

11 12

13 14 15 16 17

18 19

20

21

-1x103~-~ 22 23 24 25

I

Strobe

output Strobe

output

DP3

114

Hold Control /17 Buffer Control

LO GND

(l.ooo)*

DP4 (lo.oo)* DPl (.OlOOO)*

Buffer Control

Decimal Point Decimal Point Decimal Point

DR

1 up-range

FLAG

4 x 100 2

x 100

ZERO CHECK

R2

ZERO CHECK

8

x 10"

1 x 100 Strobe 1/5

Strobe ,,6 Strobe It8

DP 2 (.looo)*

DP5

(lOO.O)* Decimal Point

8 x lo2 2 x 102

Timing Outwt

tuta Ill

Dsra 111 output

Range Control Remote Control

Data #I

Data 01 Buffer Control

Buffer Control Buffer Conrr&

Data i/4

Decimal Point

Data 113 tuta II3 50

pin-out for 50-P*" Co""eCtor

TABLE 3-10.

Functio"

Pin No. Name

I

26

1 27 / FLAG ,

28

I

29

30 31

32

1 34

35 36

37 38

I dP 8 x 10:

39 Strobe #9

40

41 ::

44 45 46 47 48

49

Function

I

4

x

loL

4 x 101 2 x 101

1 x 102 MAN"AL RANGE

Rl

Data 113

/

I Timing 0"fpue

Data j2

Data 1/z

Data #3

Range Control

I oum,ut I

EKP 4 x 10" Strobe 03

EKP 1 x

100

Exe 2 x 100

output Buffer Control Output

output

Buffer Control "0" (IO "" range) RKP POL

101 EKP 1 x POLARITY

Fl

F2~ 8

101

x

101

1 x Strobe It1 Strobe ,,2

output output

output Output

FUnCtiO”

Func eion IkIt* 112

Data /12 Buffer Control Buffer Control

Display Hold Control

I

t--

,

Decimal Number

n = 0,1,2,3, or 4 depending on digit being decoded.

TABLE 3-12.

Truth Table for Function

Function

Function OHMS

OHMS

COULOMB

COULOMB AMPERE

AMPERE VOLT

VOLT

rT---!

0 1

F1

0 0

1 0

0 1

0

1 1

TABLE 3-11.

Truth Table for 8-4-2-l SCD Code

2

8 x 10"

4

x 10"

x 10" 1 x 10"

(4th bit) (3rd bit) (2nd bit) (1st bit)

0 0

0

1

TABLE 3-13.

Truth Table for Programmed Sensitivity

MWl”81

0 0 0 0 1 0 0 1 0 0 0 1 0 0 0 0

F2

Sensitivffy R*“ge

.Ol .Ol .Ol .Ol

1

.l

1.

10.

100.

R4

0

1 1 1

R2

0

0 0 0 1

1 1 1

Rl

0

1

1 0

1175

17

OPERATING INSTRUCTIONS MODEL 616

Truth Table for Serial Transfer

TABLE 3-14.

I,8

STR BE 6

8 9

I

1

,I

STROBE 7

19

3

27 10 I

L

,I

0

4 t Y c A 6 C II

FIGURE 20. Suggested Hook-up far Data Lines.

1175

REMOTE

t5V

"CN"

16 A-O SIGNALOV

+5v

BUFFER

STORE OV I

+5v ;

(DELAY) Ov ;

COUNTER

FLIP-FLOP

RESET OV

+Yl

RESET OV I

t5v

t5V

FLAG

ov

A

MODEL

616

I

I I

I

, MODEL

BCD

6162

A \+-

\1 A’-

1 ‘-IS~o$~;ON-’ 1

ISOLATION

lo’“cL, 1ooov

FIGURE 21. flack diagram of 61616162 System.

2016 COUNTS "COUNT NOW"

1lOOV

I

ISOLATION lo%, 1oov

2016 COUNTS

"COUNT NOW"

, DIGITAL

SYSTEM

:

HOLD activated and deactivated on the rising edge of "CN" tmmediately following application of user's "HOLD"

signal.

NOTE: The hold command is activated (or deactivated) on the rising edge of "CN". This means that when the

user applies the "HOLD" signal, the "HOLD" will not became effective until the conversion in process is finished and the data is stored in the output buffers. "HOLD" line, "HOLD" will not become effective until after the rising edge of the next "FLAG" signal. For this reason, the first "FLAG" after "HOLD" is released should be ignored and the data buffers will not be updated on the first "FLAG" after "HOLD" is released.

FIGURE 22.

Timine Diaeram for 6162 Oumuts.

This also means that when the user%leases the

MODEL 616 THEORY OF OPERATION

SECTION 4.

4-1. GENERAL.

describe the “O&l 616 circuit operation. The cir-

cuicry is located o” five printed circuit boards. The circuits are arranged in functional modules to facilitate troubleshooting and servicing. The 616’s shielded input section houses the electrometer amplifier and range switch.

4-2. ANALOG CIRCUlTKY

a.

Input Amplifier. This amplifier A1 is show” in simplified form in Figure 24. (Refer t” schematic 25764E). The input signal applied between HI and LO

(5120) is amplified by the input MOS-FET amplifier composed of transistors Q101A and Q101B. q102A and Q102B are used for aver-voltage protection

(base-emitter connected). Integrated circuit QA101

provides high gain (approx. 100,000) for the electro-

meter amplifier section. Potentiometer R123 is a* internal zero adjustment used for calibration purPOSW. Potentiometer K119 is a front pane1 ZERO control with adj”stme”t capabilitv of a~oroximatelv

3 In”. Transistors Q105 and QlOk are comp1ementa;y output stages which provide a maximum of 1200 volts

at the “Xl” terminal (Jll8). The electrometer amp-

lifier ia connected in a unity-gain configuration.

sistance between HI and LO is greater than

ohms in “VOLTS” functia”.

This section contains information to

Tranafseors

THEORY OF OPERATION

Shunt (NORMAL) Mode Operation.

b.

schematic 257643).

trometer amplifier is connected as a unity-gain

buffer amplifier with a” input resistance greater

than 2 x 1014 ohms. ed in decade steps from IO11 ohms LO 10 ob,,,s by selecting the desired shudt resistor a” the AMPERE positions of the RANGE switch. Resistors RIO1 through Rlll are switched into the citzuit shunting the HI and LO terminals. The shunt resistor can-

“ected in the circuit is numerically the reci rocal. of the AMPERE position selected (that is 10% resistor).

C. Feedback (FAST) Mode Operation.

schematic 25764E). In the “FAST” mode, the electro-

meter amplifier is connected in a feedback amplifier configuration. I” AMPERE, CO”LOMB, or OHMS functions,

the range element (resistor “r capacitor) is connect-

ed be~wee” HI and GUARD. Input resistance on AMPERE

function is determined by the feedback resistor and the open-loop gain, where:

Ri = RF (K = 50,000 minimum)

FOT example, on 10-11~ range, R* = 2 x 10611. I*p”t voltage drop for full range in,.~ut current would be less than 20 microvoles.

In the “NORMA,.” mode, the elec-

Input resistance may be decreas-

K

(Refer to

-1% :

10

(Refer to

1175

IN

RANGE

INPUT

AMP

I

POLAR/TY

A-D

- DETECTOR - CONVERTOR i

i

11

LSI

CHIP

-DRIVERS - DISPLAY

21

THEORY OF OPERATION

Zero Check Operation. (Refer to schematic

d.

257643). operates e relay solenoid (KlOl) when set to ZERO

CHECK. In the energized etate (as ahown on the

schematic) the relay contact is closed. The closed contact makes e co~ection between the FET amplifier illP"f and GUARD (5119) es fallows:

The front panel ZERO CHECK switch (5102)

MODEL 616

TABLE 4-1.

Voltazxe Gain

1. Normal Mode.

made between resistor R124 and input LO. Notice

that the input HI terminal is shunted to LO by a

10%

resistor

2.

Fast Mode.

made between resistor R124 and GUARD. Notice

that the input HI terminal remains connected to the electrometer amplifier input. Ill AMPERE, OHMS, or COULOMB functiona, the feedback element is shorted out so that no voltage can be generated across the amplifier feedback.

remote zero check capability is provided when the Model 6162 is connected to the

The connection at Pll3D is in para-

616.

llel with the front panel switch. The front panel ZERO CHECK switch should be off

when using the remote zero check feature.

e. Voltage Sensitivity. This amplifier A2 is shown

in Figure 24.

ond stage variable-gain amplifier is composed of e

FET stage (Q301A. 4301B) and an ineegrafed circuit

QA301.

F) where:

Gain is determined by resietors RN301 (A to

(Refer to schematic 25776D). The eec-

In this mode, a connection is

(~112).

In this mode, a connection is

Gain = 3 (See Table 4-l.)

RI

10.00 ” 500m

100.0 " 500KO

1. Gain setting. Resistors are connected in parallel combinations to achieve the proper gain. ting, the gain is determined by the series combination of resistors RN3OlB and R303. Potentiometer

R303

10 m" sensitivity setting. For each succeeding sensitivity, the resistors are switched into the circuit as shown in Table 4-2. Potentiometer

R304

sensitivity setting.

S‘XSiti”itY

I

.01000v 50 Mn (RN301+? + R303) .lOOO ” 5 MCI (RN301B + R303//RN301C)

1.000 ”

10.00 V

100.0 "

La a calibration adjustment for the

iB a calibration adjustment for the 1OOV

On the 10 mV sensitivity set-

TABLE 4-2.

Gain Switching

Feedback Resistors Used For Gain Set.

500 K$? (RN301B + R303//RN3OlC//RN3OlD)

50 Kn (RN301B + R303//RN301C//RN301E)

5

KC (All above//RN301F + R304)

50

Kn 0.1

5

Kfl 0.01

RN3OU

to RN301F

I

22

INPUT

0

LOW 0

UNITY GAIN

BUFFER SENSITIVITY

SETTING

FIGURE 24.

Simplified Diagram of Amplifier Section.

1 VOLT

0

1175

MODEL 616 THEORY OF OPERATION

Gain Selection Logic. (Refer to schematica

2.

25776D, 257788).

used to determine voltage sensitivity.

A three line ranging code is

The coding for the three lines (R4, R2, Rl) is given in Table 4-3.

TABLE 4-3.

Ranging Logic

where 0 = open state

1 = t5v *ate

3. Zero

Adjustment.

Potentiometer R311 is an internal zero adjustment for calibrating the "lv" recorder output.

f. Ammeter Operation. (Refer to schematic 25764E).

In the AMPERE mode, a range resistor (RlOl through

Rlll) is connected between input HI and GUARD. The

current-Lo-voltage conversion 1s determined by the following relationship:

ER = voltage developed across R I - input current R = range resistor

In the "NORMAL" mode, the input voltage drop is equivalent to drop is a funct on of open loop gain (typically ZO!JV).

The use of the FAST mode is limited to

In the "FAST" made, the input

"H.

ranges 10m5A to lo-llA due to loading and stability

considerations.

1175

23

THEORY OF OPERATION

FIGURE 27. Coulombmeter Configuration - FAST Mode.

g Coulombmeter Operation.

257k4E).

(Cl01 through Clll) is connected between input HI

and GUARD.

determined by the fallowing relationship:

h. Ohmmeter Operation.

257643). connected into the electrometer circuitry. The voltage sensitivity is selected as in VOLTS operation. source and a series (RANGE) resistor. The series resistor is selected in decade steps in the OHMS position (resistors R105 through Rlll). The voltage source is provided by dividing down from a +12 volt reference supply.

internal calibration adjustment.

In the COULOMB mode, a range capacitor

The charge-to-voltage conversion is

EC = $ Ii dt -z EC E voltage developed acrow C

C - range capacitor

Q ,- stored charge

In the "OHMS" mode, a current Llource is

The current source is composed of a voltage

Potentiometer R114 is an

(Refer to schematic

Ohmmeter Divider Network

Ohms

Range

The current developed by the ohmmeter circuit is determined as follows:

where I = Furrent in amperes

R

Total

12K 1.0101cn

12K l.OOOK61 12K 1. OOOKQ 12K

12K

12K l.OOOKQ

12K l.OOOKn

12K

1-E E - voltage as in Table 4-4.

R = range resistor (R105 through Rlll).

TABLE 4-4.

R,

1.ooom

1.oooKo

100

E = 12 Rl/(Rl+R2)

-.A&-

10.990Kn ll.OOOK ll.OOOK ll.OOOK ll.OOOK ll.OOOK ll.OOOK

11.9 K

E

1.01 v

1.00 v

1.00 "

1.00 v

1.00 "

0.1 "

24

FIGURE 28. Ohmmeter Configuration - NORMAL Mode.

1175

MODEL 616

i. Polarity Detection Circuit. schematic 257760). This circuit detects the polarity of the input signal and triggers the polarity display circuitry,

1. First Stage Amplifier. When the input to

intearated circuit D301-conducts causing the a&ifier ti op&?ate with a gain of 2X (inverting). A negative-going

input to QA302 is not amplified due to the block-

ing action of diode D301 which prevents the output of QA302 from going positive. Transistor

Q306 conducts to maintain feedback around QA302 and therefore provides polarity information co

turn-off the "minus" polarity.

2.

Second Stage Amplifier. Integrated circuit

QA303 is used as an inverting summing amplifier.

Far a positive-going input to the polarity detec-

tion circuit, QA303 provides a gain of -1 for a net output of +lV maximum. When the input is negative-going, the inputs to provide a net oucpuc of +lV maximum.

3. Adjustments.

ternal calibration control for adjustment of amplifier zero. Potentiometer R307 is an internal calibration control for adjustment of gain in the summing amplifier QA303.

OA302

is msitive-noina. diode

Potentiometer R305 is an in-

(Refer to

QA303

are summed to

4-3.

ANALOG-TO-DIGITAL CONVERTER.

schematics 25776D. 25778B). The a-to-d converter

operates on a charge balancing principle. The circuit operates only with unipolar inputs. A block diagram of the converter is shown in Figure29. The

positive output of the polarity detector circuit

drives the integrator amplifier QA304 negative. The integration rate is determined by the input level,

resistors RN304A and RN304B and capacitor C308. As the integrator goes negative, the threshold detector (amplifier QA305) output goes to a positive

level.

the "J" input of the J-K flip-flop (the "K*' input

is a logic "0"). for the integrator are determined by the state of

the Q output on the J-K flip-flop. When the Q output Se high, diode QA306 D is back biased off

and the integrator can only be charged by the polarity detector output. When the Q output is

low, diode QA306-D is forward biased and discharge

of the integrator is possible.

states can be changed only when a clack pulse is present, the charge/discharge periods are a function of the clock frequency. is free-running and has a timing period of 2016 Counts. The digital reading is derived by counting clack pulses in the discharge pkriod. Far example, a 1 volt input would result in a total count of 1000 clock pulses. counts. counts, the remaining 32 counts are needed to stop

the BCD counter, strobe the ED counter information into latches, reset the BCD counter to zero, and initiate uprange or downrange (or overrange). The conversion rate is approx. 0.2 sets/conversion

(2048

A positive level represents a logic "1" *t

The charge and discharge periods

The a-to-d conversion cycle

One complete conversion cycle is 2048

In addition to the timine wriad of 2016

counts at a 10 kHz clock rate).

(Refer to

Since the Q and Q

I j

*REF

- 9V REF;

A-D CONVERTOR

INTEGRATOR

,t CL$,L~;T’--------

I K

9K

IEi

I I

’ LSI W/P

THRESHOLD

DETECT

,

J

CLOCK

0

- --

THEORY OF OPER**ION

MODEL 616

AUTO-RANGING CIRCUIT.

4-4.

257788). (QA408) with exception of decoding diodes D3Ol.A

through D301H and FET switches Q302 through Q305. The threshold input (TH) and current switch (CS)

signals are used to determine the proper range. Ranging is bidirectional so that upranging or downranging to an adjacent range occurs. The a"toranging feature is defeated by grounding pin 6 (MS) on LSI QA40S.

4-5.

four LED, 7-segment readouts plus a polarity/aver-

range readout. plexed 80 that only eight lines are driven at a time.

a. Multiplexing Circuit. This circuit is contained in the LSI QA20S. four multiplexing lines which turn on the anodes of each seven segment readout. Four of the lines are used for each of the four digits. Polarity, decimal point, and dummy zero (an the .OlOOOV ranple) are not

multiplexed. to provide sufficient drive for transistors Q405 through Q407 respectively. Each anode of each LED.

readout is pulled up to approx. +lO volts to light

a particular digit.

b. Display Coding. Each dieplay module has separate cathode connections for each segment as given in Table 4-5.

This circuit is located on the LSI module

DISPLAY DRIVE. The 616 display is composed of

The display drive circuit is multi-

The dieplay is controlled by the

QA401A through QA4OlD are used

(Refer to schematic

I

Numeral

8 9

decimal

FIGURE 31.

Display Codi

A,B,C,D,E,F B.C. A,B,D,E,G A,B,CL',G

B.C,F,G A,C,D,F,G

A,C,D,E,F,G A,B,C

A,B,C,O,E,F,G A,B,C,E,F,G

decimal

Digital Display.

TABLE

4-5.

Fills

1,13,10,8,7,2 13,lO 1,13.8,7,11 1,13,10,8,11

13.10.2.11

i,io,S,;,ii

1,10,8,7,2,11 1,13,10 1,13,10,8,7,2,11

1,13,10,7,2,11 6

CS

TH

-OUTPUTS

RANGE

MULTIPLEXER

TO READOUTS

FIGURE 30.

26 1175

Functional Block Diagram of Large Scale Integrated Circuit.

MODEL 616

THEORY OF OPERATION

c.Dacima1 Point (Sensitivity) Codingl Three

coded lines are used to generate the decimal point drive.

The lines are designated Ri, ;?;, ;;it4;or Inverters QA404A.C.E ,,rovide B lot c a corresponding logic-"0" stare (&xure to LO) on any of the lines. !&en used in the AUTO mode, a fourth line is used to defeat the automatic ranging circuit.

The remote enable line (MR) is activated "hen a connection to LO is made at pin 6 (MB) on LSI OA408. A truth enhle for decimel point logic is given in Table 4-6.

TABLE 4-6.

Decimal Paint Coding

S*nSitiVity

S*tthg

B4

%

5

.01000 0 x x .lOOO

1 0

0

1.000 1 0 1

10.00 1 1 0

100.0

1 1 1

d. Overrange Indication. Overrange is indicated

by diode network DN403. Transistor Q403 controls

the cathodes for segments A,D,F,E co display a "0". When transistor Q403 is turned off, the display indicates a "1" since segments S and C are always eurned on (pins 10 and 13 are connected to LO).

e. Dupuny "0" Indication.

When the 10 millivolt range is selected, the 616 display indicates a fifth digit (DN402) and decimal paint. Transistor Q402 controls the cathodes for segments A,B,C,D,F,E to display a "0". Transistor Q402 is turned off

when R4 is high (QA404A = low).

f. Polarity Indication.

The polarity display DN401

is controlled by eranaistor Q401. The minus sign is always lighted.

Additional segments are turned on

for rhe plus sign.

8. Overload Indication.

The LSI module (QA40S) contains additional circuirrv for overload blankine of the display.

When the display exceeds 200 volt:, the circuit causes a blinking action of the three least significant digits. The display reads properly

up to 201.7 volts (001.7 max.).

b. Decimal Point. This circuit is composed of

inverter stages QA405A.B.C which provide sufficient

drive for optical isolators in the Model 6162. De-

cimal point is coded in three lines B4. R2, Rl as shown in Table 4-6.

4-s.

POWER SUPPLIES (Schematic 25777D).

a. Primary Power. The Model 616 can be operated over two ranges of line voltage. Switch 5201 haa two line voltage positions a.8 follows:

117V: 9OV - 125V rms range 234V: 18OV - 250V rms

50-60 Hz, 9W

Fuse (F201) must be selected for each line voltage range as follo"s:

117": 3116 ampere, 3AG SLO-BLO 234V: l/l0 ampere. 3AG SLO-BLO

b. Secondarv Power.

The Model 616 power supply

is composed of four separate supplies. Transformer

T201 provides four center-rapped secondary windings.

1. i275V Unregulated. This supply taps a-c

power from secondary windings l-2-3 of T201. Diodes

0201 through 0204 form voltage-doubling supplies. Outp"t voltage is approximately 275 volts at 2 milliamperes (at nominal line voltage). Ripple is

a,qn-oximately 2 volts peak-to-peak at no load.

2. t12" Regulated.

This supply taps n-c power

from secondary windings 6-7-S of T201. 0205 is

a four-diode full-wave bridge. Integrated circuit QA201 provides a regulated f12 volts at 10 milliamperes. Ripple is approximately 1 millivolt peak-to-peak at nominal loading.

3. -9" Regulated. This supply also utilizes D205 for full-wave rectification. Zener diode 0206 provides a regulated voltage of -9" at 5 "illi*"peres. Ripple is approximately 3 milli-

volts peak-to-peak.

REFERENCE OSCILLATOR. The reference frequency.

4-6.

(clack) circuit is composed of integrated circuit QA406 and other fixed components forming a freerunning 0scillaP.x.

The oscillator operates af frequency of approx. 10 kHz. The output of rransistar Q411 is a clock pulse between -0.7 volt and +5

volts dc with a 5 microsecond pulse widrh.

MISCELLANEOUS CIRCUITS USED FOB 6162, These

4-7. circuits are used to generate signals or signal levels for the Model 6162 Isolaced Output/Control.

a. Gated Clock.

This circuit is composed of in-

verters OA405D.E.F and NAND eates OA407A.B.C. The

drcuic Abi&~'~i~~8l~ fr& the is1 && 4

clock to provide a gated clock "GC". This signal and

"CN" are used to generate BCD outputs in the Model

6162.

1175

4. +5V Regulated. This supply caps a-c power from secondary windings 9-10-U of TZO1. Diodes 0207 and 0208 form a full-wave rectifier. I"t*grated circuit QA203 provides a regulated output of +5 volts at 200 milliamperes. Ripple is spproximarely 1 millivolt peak-to-peak.

5. +lOV "nregulaced.

This supply utilizes the

unregulated outpuf of the full-wave rectifier 0207-

DZOS. Ripple is approximately 1 volt peak-to-peak

at 200 milliampere loading.

6. -12V Regulated.

This supply taps a-c power

from secondary windings 13-14-15 of T201. Diodes

D209 and D210 form a full-wave rectifier. Ince-

grated circuit QA202 is a regulator element.

Transistor Q201 is a series-pass regulator. Out-

put voltage is -12V at 50 milliamperes. Ripple is approximately 2 millivolts peak-to-peak.

27

THEORY OF OPERATION

MODEL 616

TABLE 4-7.

k7.n ldentlticetl0" *or LSI

Pi" No. Designaeian Function

1

F

Segment drive +5" = ON, 0" - OFF 2 G Segment drive +5V - ON 3

Tl

Multiplex Line +5V = ON 4 T3 Multiplex Lice t5V = ON 5 HOLD 6 MR 7 8

TH

CLK

Display hold +5v = "OLD Range Enable 0" = inhibit autoranging Threshold input +5v or -12V Clock Pulse

A~prox.~

9 B Segment drive +5V = ON

10 A Segment drive +5v = ON 11 D Segment drive

+5" - ON 12 E Segment drive t5V = ON 13

C 14 cs 15 DP 16

$44 17 TO Multiplex line +5v - ON 18

Fl 19 F4 20 21 22 23

24 25 26 27 28

Segment drive +5" = ON Current Switch +5V = integrate mode No connection No connection

-____

Power Power CO"lSOtl Count Now Multiplex line

0" +5v +5v

-12v OV +5v - 2016 counts

+5v = ON Range Line Range Line

See Table 4-6.

Rmge Line

___

0"

Voltage

Levels

,10kHz_,~~+SV to -lV

_--

-__

4-9. DIGITAL OUTPUT (Refer to schematic no'e 25715D,

25716D, 25717C, and 25823C).

a. Isolatia" Circuitry. Isolation of electrometer LO and diuital Outout Lo is achieved throunh the use of a" opt&ally c&led isolator for each Big"81 transmitted between the 616 and 6162. The isolators are NPN types and provide greater than 10lOn isola-

tion resistance.

diodes are connected to +5 valts.

The anodes of all light emitting

The diode conducts

whenever the cathode is connected law (a 3300 current

limit resistor is used with each input). The output of each isolator transistor is connected in e grounded emitter or emitter-follower configuration.

b. Decade C~u"ters.

The Model 6162 utilizes three

decade cwnter stages QA201, QA202, and QA203 for

"l", "lo", and "100" respectively. Each integrated circuit provides BCD information using four linea identified as 1 x lo", 2 x lo", 4 x lo", and 8 x 10".

Storage Registers.

C.

Individual storage registers are used to control data flow to the ~"tput buffer stages.

Integrated circuits QA205, QAZOk, and QA207

are enabled by the output of QA223A (ENB).

d. Buffered Output Stage. Each buffer ia composed qf a Keithley Part No. IC-22 NAND gate (four gates per circuit module).

The buffers utilize "open collector" output transistors. Each circuit module is connected to a" individual STROBE control for mon-

itoring two or more 6162 autputs connected to a single outpur bus.

Each set of four buffers is enabled

whenever the Strobe line is pulled davn to digital

10W. Each STROBE circuit consists of a" inverter stage (Keithley X-32), a 4.7 kilahm pull-up resistor, and a protectian diode (Keithley RF-39).

e. Print Rate Control.

Print rate for the Model 6162 consists of a timing circuit composed of integrated circuit QAloS, resisrar X116, pOte"tiometer R115 and capacitor ClOl. Patentiometer R115 permits continuous control of Print Rate from l/5 second per reading to 7 seconds per reading. The Print Rate cantrol has no effect on the Model 616 display rate.

f. Flag Circuitry. The Flag autput is generated by integrated circuit QAloS. The oucput of buffer stage QA222C is high far a length of time established by the Print Rate Control. No change in the digital output is made during the interval when Flag is high.

(Flag is Iv,,).

g. BCD Hald Circuit.

This circuirry inhibits the

Enable oulae which in turn holds the infwmatio" in

the s&-age registers.

ever DlOl is closed t" wtput low.

The Hold is activated when-

Integrated circuit

QA109 is a flip-flop which is set by m.

h. Display Hold.

This circuitry controls the display driver in the Model 616. The Display Hold 1s activated whenever D102 is clased to output law.

1175

MODEL 616

SECTION 5. ACCESSORIES

5-1. GENERAL. me following ‘(eithley acces.sories

can be used with the Model 616 co provide additional convenience and versatility.

Model 6101.4 Shielded Probe Description: The Model 6101A is a shielded cable with B needle-point

probe

and 30 inches of low noise cable terminated by a

UHF COn”eCtor.

Model 61018

Description:

The Model 61018 is a shielded cable wieh a “gripping

type” probe and 30 inches of low noise cable terminated

b,y a WF Co”“ectOr.

5-2. OPERATING INSTRUCTIONS. A separate Instruction Manual is supplied with each accessory giving complete operating information.

Shielded Probe

Model 6103C Divider Frobe Description: The Model 6103C is a shielded cable with a needle-point

probe

and 30 inches of low noise cable terminated by a

UHF connector. The

orobe

includes a 1OOO:l voltwe divider with a 4.5 X’ 101ln resistance. Accuracy Is 25% at 30 kilovolts.

Model 6102A

Description:

The Modei~ 610% is a shielded cable with a needle-point

probe and 30 inches of low noise cabic terminated by a UHF connectorlO The probe incl~odes a 1O:l voltage divider with 10 il input resistance. Accuracy is z&X at

1000 volts.

Divider Probe

0577

29

ACCESSORIES

MODEL 616

Model 6011 Input Cable

Description: The 6011 is a low-noise triaxial cable, 30” long, terminated by three color-coded alligator clips.

input. no. ~3-141 connector and part no. SC-22 low-noise cable.

IleWZk-iptiCXl: The 6301 is a guarded triaxial cable,

3 ft. long, terminated by a probe for making point-topoint measurements.

This cable mates directly with the triaxial

The cable is fabricated using a Keithley part

Model 6301 Guarded Probe

Model 1531 Gripping Probe

Application: The 6011 may be used far measurements

which require a triaxie1 connection, especially when

the input I.0 is floated above

Application: The 6301 may be used for measurements which require a triaxial cable with a guarded pfZbzhms,~

having an insulation resistance greater than 10

CASE

ground.

e

SC-22

cs-141

Description: The 1531 is a triaxial cable, 3 ft. long, Application:

terminated by a special gripping-type probe. insulation resistance is greater than lOlo ohms.

probe is rated far off ground measurements up to 500 ”

Hi

Lo Lead

Description: The 6012 is an adapter for mating the

triaxiel input end UHF (coax) type connectors. This

adapter can be used with Models 6101A, 61018, 6103R,

6102A, etc.

The 1531

The

Model 6012 Triax-to-Coax Adapter

which require a triaxial cable. The probe permits convenient connections to the circuit under test due

to the gripping feature.

CS-64

The 1531 may be used for meas”rements

es-141

30

1175

MODEL 616

ACCESSORIES

Mod>1 6106 Elect,

Description:

The Model

blob

contains a group of the most useful

leads and adapters for low current measurements. All

components are housed in a rugged carrying case with

individual compartments.

Models 2501, 2503

:ometer Connection Kit

Parts List:

Description NO.

Cable, Xl”, UNF to clips

Cable, 24”, UHF to UHF

connector, UHF to UHF 3 Adaptor, UWF to BNC 4 Adaptor, UHF to BNC Adaptor Tee, UHF to “HE Adaptor, Binding Post 7

The two cables (Items 1 and 2) are coaxial shielded

leads useful for connections where low noise is essen-

tial. The 24” cable (Item 2) can be used to interconnect two instruments having UHF receptacles. The 30”

cable (Item 1) can be used to connect to the circuit

under test through the use of clip leads. A bind~ing

post adapter gives easy access to the electrometer

“high” terminal. Two UHF femal couplers (Item 3) permit cables to be connected together. The “HP “tee” connector simplifies galvanometric cUrrent measurements

when using a current source and electrometer or pica-

ammeter.

Adapters (Items 4 and 5) are useful for con-

version from UHF to BNC terminations.

Static

Defector Probes

Item

1

2

5 6

Keithley

Pam NO. 19072C

18265C c-5 m-115 CS-172

lx-171

190718

Description: The Models

2501 and 2503 are specially designed de-

tector~ used to measure static charge on plane surfaces.

Either Drobe must be used with an electrometer

Model 2501: The 2501 is useful for measurements of charge on flat

surfaces.

The static head is 3 inches in diameter.

Recomended spacing is 318” from the surface for

lO,OOO:l divider ratio. The 2501 is calibrated such

that a 1 volt deflection on the electrometer con-e-

spends to 10 kilovolts of static charge.

Model 2503 :

The 2503 consists of a rigid probe l/2 inches in diameter.

probe.

Operation is similar to the use of the 2501

Model 6107 p” Elecrrode Adapter ,- Model 6107 p” Elecrrode Adapter ,Description: Description: The Model 6107 is a test fixture which simplifies cm-

nections to the electrometer when making p” measurement.3.

factured

The

in the diagram.

The adapter can be used with electrodes man”-

by

Leeds &Northrup, Coleman

and Beckman.

6107 can be used far guarded measurements a~ shown

A

voltage-to-p” conversion chart is

supplied with the 6107.

------------1

I

A? Pip Jd

LJ2 ,

ACCESSORIES

Model 6104 Test Shield

Description:

The Model 6104 is a shielded test box for two-terminal

or three-terminal connections. The ‘INPUT terminal is teflon insulated.

Applications:

1. TWO Terminal Connections. Resistance measurements can be made conveniently using the INPUT and GROUND terminals on the Test Sax. Connect the elec-

trometer to the SNC output. Use the electrometer in

NORMAL

mode

for ohms

measurement.

MODEL 616

2. Three Terminal Connections. The GUARD output

on the Mode:

616 electrometer can be used for re-

sistance measurements where the effects of cable capac-

itance may be significant.

INPUT and EXT terminals.

the GUARD output an the electrometer.

erometer

In FAST mode for ohms measurement.

Connect the unknown between

Connect the EXT terminal to

Use the elec-

Model 6105 Resistivity Chamber

Description: The Model 6105 is a guarded test fixture for measure-

ment of surface and volume resistivities. The chamber

Fs designed in accordance with ASTM Standard Method of Test for Electrical Resistance of Insulating Materials, D257-66.

The 6105 can be used in conjunction with an

electrometer and voltage supply.

Applications:

Resistivity can be determined by measuring the current through a sample with a known voltage impresaed. The

measurement can be made most conveniently when B set

of electrodes are used which can be calibrated in terms Of surface or volume resistivity. The Keiehley Model 6105 Resistivity Adapter has been designed for use with a Keithley electrometer and an optional high voltage supply such as the Model 240A.

32

1175

MODEL 616

MAINTENANCE

SECTION 6.

GENERAL. This section contains information nec-

6-1.

essary to maintain the instrument to published speci-

fiCSltiO"S.

REQUrKED TEST EQUIPMENT. Minimum requiremenes

6-2. for test equipment are given in Tables 6-l and 6-6.

PERFORMANCE "ERIFICATION.

6-3. procedure to verify proper operation of the instru-

ment .

Performance of the instrument is based on an operating telnperature between 20°C and 3o"c and relative humidity less than 70%.

Preliminary set-"E.

a.

set the Line Switch to 117 or 7.34" depending

1.

on the line power available.

Fuse Check:

2.

Verify that the appropriate line

fuse is installed.

117": 3116 ampere, 3AC, SLO-SLO (Keithley F"-29) 234V: l/l0 ampere, 3AG, SLO-BLO (Keithley R-40)

3. connect the power cord to a variable transformer which has been set to 117" t 1" or 234V I 2" depending on the line power available.

"se rhe following

MAINTENANCE

5. Turn the instrument power on and allow the instrument to stabilize at ambient temperature for at least l/2 hour. Record the temperature so that temperature coefficients can be utilized as necessary.

b. Voltage Accuracy Check.

1. Select NORMAL mode and VOLT function.

2. Select the AUTO SENSITIVITY mode.

3. Place ZERO CHECK switch on. The display should indicate .OOOOO volts. the front panel ZERO control to obtain a rero reading with the polaricy indicator blinking on and off.

4. Place ZERO CHECK switch off.

5. Apply dc voltages to the in,xe of rhe Model

616 as given in Table 6-2 using Voltage Source (A).

TABLE 6-2.

Voltage Accuracy Check

source Display

Accuracy

If necessary, adjust

Reading

Tolerance

Connect the shorting link (on the rear panel)

4.

between LO and GROUND.

FIX maximum operator safety, make certain that the chassis is connected to earrh ground by way of rhe third conductor on the line cord or by way of a separate clip lead from GROUNU

to earth ground.

TABLE 6-1.

Item Description Specification

A Voltage Source (DC), lOm" iO.O3% accuracy

to 100" in decade steps

(For 1OmV range use 1O:l divider)

B

Resistance source, 1050 to ?0.05%, 105n f0 1070 1O120 in decade steps

f0.2%, 1oSn ?0.5%, 1oQ to 101*0

c

Current Source, lo-lA to

iO.O5%, lo-IA to lo-4A

10-4A

D

current source, lo-?+ ~to

tO:b;$ l&5A to 10-7A

lo-'A Ranges

E

current source, 10-g to lo-=A

LtZ%, 10-8A

0.6%, 10-gA to 10-llA

10 m"

100 Ill"

0.03%

1" 0.03%

10 " 0.03%

100 V 0.03%

Fluke, Mode1 341A

) ,I)

GK 1455BH (divider for 10,~")

GK 1433, Keithley Model 5155

Fluke, Model 3330B

4

Fluke, Model 341A, and GR1433 see Note 1.

Keithley Model 261.

3 11, C.d :,; : i

.01000 " t3 digits .lOOO v

1.000 v 23 d&t*

10.00 v 3 digit..

100.0 " i3 digits

Mfr. and Model

?3 diaits

E

1175

NOTE 1.

To Verify the accuracy on the 10-5A to used with precision resistors having t0102$accuracy.

$0-7

ranges, a Model 341A should be

u'

33

MAINTENANCE

MODEL 616

Resistance Accuracy Check.

C.

Select NORMAL mode.

1. Select the 1 VOLT SENSITIVITY mode.

2.

3. Select the LO5 ohm range.

4. Apply lo5 ohms using Resistance Source (B).

5. Verify that the reading an the display is

within i6 digits.

Check the remaining ranges in accord with

6.

Table 6-3.

TABLE 6-3.

source

Resistance

source Display

Accuracy

Check

Reading

Input Accuracy Range Reading Tolerance

105 n 106 n 107 0 108 n 109 n lolon 10%

1012fl

iO.O5%

FO.O5% i0.05% ?0.2% f0.5% ?0.5% f0.5%

10.5%

105 n

1.06

s2 107 n 108 n 109 n 101On 1011n 101211

1.000 x

105 n

106 R 10' il 108 n 109 n 101on 1011n 101G

f6 digits i6 digits

i6 digits

t21 digits f51 digits ?51 digits f51 digits i51 digits

6. Check the lo-1A to lo-4A ranges in accord

with Table 6-4.

Select FAST mode for verification of 10-5A

m'io-llA ranges.

8. Check the 10-5A to lo-llA ranges using Cur-

rent Source CD) and (0.

9. Verify ranges in accord with Table 6-4. TABLE 6-4.

current Accuracy Check.

source Input

10-l A lo-' A 1O-3 A 1O-4 A 1O-5 A 10-6 A

1017 A

lo-lo, lo-11A

e.

source

Accuracy Range

i-0.05% iO.O5% r0.05% k0.05% *o.o5z 10-5

io. 05% ?0.05% 10-7 kO.Z%

10-l A 1.000 x 10-l A f6 digits

IO-~

A 1.000 x 1O-2 A i6 digits lo-3 A 1.000 x lO-3 A *6 digits 10-4 A 1.000 x 10-4 A f6 digits

A 1.000 x 1O-5 A t6 digits

10-6

A 1.000 x 10-6 A ?6 digits

A

10-8 A 1.000 x 10-8

+o.6% LO-' i-0.6% +0.6%

10-10;: ::::; :: :h", k51 digits lo-"A 1.000 x 10-llA i51 digits

Coulmbs Accuracy Check.

Display Reading Reading Tolerance

1.000 x lo-' A +6 digit6

-g A iZ1 digits A i51 digits

Current Accuraw Check.

d.

Select NORMAL made.

1.

2. Select 1 VOLT SENSITIVITY. Select 10-l ampere range.

3.

4. Apply 10-l ampere "sing Current Source (C).

5. Verify that the reading O" the display is

within t6 digits.

Coulombs Accuracy Check.

source source **put

Accuracy

lo-8A kO.5% $aA

f0.5% ?0.5%

lo-llA 50.5%

Range Reading

lo-'q lo-SQ 10-9 10-l Q

8

TABLE 6-5

Display

Select FAST mode.

1. Select 1 VOLT SENSITIVITY.

2.

3. Apply an input current in decade steps from

10-8 ampere to lo-11 ampere in accordance with

Table 6-5.

CHECK" switch apen.

(Display should read zem with "ZERO

If not, close "ZERO CHECK"

switch for short period of time.)

Verify that the integration time to reach a

4.

1.000 volt display is 10 seconds *l/2 second.

Time to Reading

10 sets. 10 t?ecs. 10 sets.

10 sets.

Tolerance t1/2 sec.

ill2 sec. f1/2 sec. *1/z sec.

1

34

1175

MODEL 616

MAINTENANCE

6-4. ADJUSTMENT AND CALIBRATION.

This procedure should be used whenever it is necessary to calibrate the instrument to ensure that it meets published spe-

cifications. Calibration may be accomplished every

12 months to ensure accuracy over long-term use or more frequently if desired.

a. Test Equipment.

The test equipment recommended

in Table 6-6 should be used to ensure proper ~results.

Other equipment may be substituted if specifications meet or exceed those given.

b. Enviranment The calibration should be perform-

ed in a controlled environment. The factory calibra-

tion is performed at approximately 25'C temperacure and less than 50% relative humidity. Recommended

temperature range for caLibratlon is 23'C to 2°C.

C. Preliminary set-up.

Set the Line Swifch to 117 or 234V depending

1.

on the line power available.

2. Fuse Check: Verify that the appropriate line

fuse is installed.

117.":

3/16 ampere, 3AG, SLWBLO (Keirhley FU-29)

234V: l/l0 ampere, 3AG, SLO-BLO (Keithley FU-40)

3. Connect the power cord to a variable tra"s-

former which has bee" set to 117V Z 1" or 234V f

2" depending on the line power available.

d.

Power Supply Check. This procedure verifies

chat the power supply voltages are within nominal

colere"ces.

No adjustments are required.

1. Measure rhe supply voltage at the test points

given in Table 6-7 using Voltmeter (F).

2. Verify the reading for each voltage.

e. Voltage Calibration. (Select. NORMAL mode for

a11 Measurements.)

1. Front Panel zero Place ZERO CHECK to on.

4. Select l&V SENSITIVITY.

b). c). Monitor the Xl output (5118) using "olt-

meter (F).

d). Reading on Voltmeter (F) should be .OOO

OlOmV dc.

e). Adjust franc panel ZERO (R119) as necessary.

NOTE

If the front panel ZERO control does not provide enough adjustment capability, the internal potentiometer R123 should be adjusted.

(Located on small pc board inside shielded

input campartment.)

2. A-D Input Zero.

4. Connect the shorting link (on the rear panel) between LO and GROUND. For maximum operating safety, make certain that the chassis is connected to

earth ground by way of the third conductor on the line cord or by way of a separate clip lead from

GROUND to earrh ground.

5. Turn the i"strume"t power on and allow the

instrument fo stabilize at ambient

temperature

for at least l/2 hour. Record the temperature so that temperature coefficients can be utilized as necessary.

TABLE 6-6.

Reauired Test Eauioment for Calibration.

Itern

F

Voltmeter, 3-112 digits, ?0.2% accuracy

Description Specification

ill" resolution

G Oscilloscope (Used for lmV/divisio" ac coupled

power supply check)

H Voltage Source (DC) +5mv ?l% accuracy Keithley Model 260

I

Voltage Source (DC), 1OmV

iO.O3% accuracy

to 100" in decade steps

(For 1Om" range use 10:ldivider)

.J

Resistance source, 105ii f0.02% accuracy General Radio,

Place ZERO CHECK to on.

a). b). Select 1OmV SENSITI"lTY.

c). Monitor rhe 1" output (5117) using "alt-

meter (F).

Reading on Voltmeter (F) should be 00.0

d).

*l.Om" dc.

e). Adjust potentiometer R311 (A-D INPUT ZERO)

as necessary.

Mfr. and Model

Keithley Model 160

Tektronix, Model 561A

Fluke, Model 34111 GR 1455BH (divider for 1OmV)

Model

1433

1175

35

MAINTEPlANCE

Voltage

Test Point

TABLE 6-7.

mwer Supply Check

Tolerance

MODEL 616

Pk-to-Pk Line Regulation

Ripple 9ov - 125v AC __

+5v

+1ov

-12V

-9v

+12v

+275v

-275V -275V "nreg.

3. Display zero. Place ZERO CHECK to off.

a).

Select 1V SENSITIVITY.

b). c). Apply +5 millivolts dc ?l% using Voltage

source (II).

Reading on Model 616 should be +0.005 ?O

d).

digits.

Adjust potentiometer R308 (DISPLAY ZERO)

=).

as necessary.

Rectifier Zero.

4. Select 1v SENSITIVITY.

a).

Apply -5 millivolts dc ?l% using Voltage

b).

source (H) .

Reading on Model 616 should be -0.005 f0

C).

digits.

Adjust potentiometer R305 (RECT. ZERO) as

d).

lleCet?tXWy.

TP4

+1ov unreg.

TP5 TP2 TP3

+275v unreg.

?25Om" f7.5V to +11v i-6OomV *45Omv

i6OomV +205 to +3oov

-205 to -300V <3v

anv +1Omv ‘1V Unregulated <2mV flOUlV

<4nlv fl5OmV <4mv GV Unregulated

C).

digit.

d).

necessary.

7. 1OMV RANGE ADJ. a).

b).

(I) (with 1O:l divider).

C).

digit.

d). Adjust potentiometer R303 (1OmV RANGE 03.)

as necessary.

range of approx. -o!Jv to +loouv.)

The front panel ZERO control may have to be adjusted in ZERO CHECK prior to this adjustmem CO eliminate an error due to zero offset.

?lhV Unregulated

Apply -lV dc f0.03% using Voltage Source

Reading an Model 616 should be -1.000 *O

Adjust potentiometer R307 (-DC CAL) as

Select 1Omv SENSITIVITY.

Apply +1O,,,V dc iO.O3% using Voltage Source

Reading on Model 616 should be +.OlOOO il

(This control has an adjustment

NOTE

If an adjustment of potentiometer R305 is required, repeat steps 3 and 4 until bath readings are obtained without further adjustment.

5. +lx CAL. Select 1V SENSITIVITY.

4. Apply +lV dc iO.O3% using Voltage Source

2. Reading on Model 616 should he +l.OOO +O

C).

digit.

d). Adjust potentiometer R309 (+DC CAL) as nec-

WFkWY.

NOTE

The +DC CAL must be performed (in the order given) before the -DC CAL to obtain proper

calibration.

6. -DC

36

CAL.

Select 1v SENSITIVITY.

a).

8. 1oov RANGE A&J. Select 1OOV SENSITIVITY.

a).

Apply +lOO.OV dc ?0.03% using Voltage

b).

source (I).

Reading on Model 616 should be +lOO.OV

c) *

rl digit.

Adjust potentiometer R304 (1OOV RANGE ADJ3.

d).

as necessary.

f. Resistance Calibration.

1.

Select 1v SENSITIVITY.

2.

Select 105Q range.

3. Apply a resistance of 100 kilobms iO.O2%.

4. Reading on the Model 616 should be 1.000 x

105n f0 digif.

5. Adjust potentiometer R114 (OHMS CAL) as nec-

ee.s*ry.

MODEL 616

REPLACEABLE PARTS

SECTION 7.

7-1.

REPLACEABLE PARTS LIST: This section contains a list of components used in this instrument far user reference. The Replaceable Parts List describes the individual parts giving Circuit Designation, Description, Suggested Manufacturer (Code Number),

Abbreviations and Symbols

A CbVar

CerD cer Trimmer CLXlp

DCb oesig.

EAL ETB ETT

Carbon Variable ceramic Disc Ceramic Trimmer Composition

Deposited Carbon Designation

Electrolytic, Aluminum Electrolytic, tubular Electrolytic, tantalum

F Fig

GCb

k Ir

M Mfr. MtF

MY NO.

REPLACEABLE PARTS

TABLE 7-1.

Class enclosed Carbon

micro (10-b) ~~~

Manufacturer Metal Fill” Mylar

Number

Manufacturer’s

Number.

Also included is a Figure Reference Number where applicable. each Manufacturer is listed in the Listing, Federal Supply Code, Handbook H 4-2.

kilo (10 3,

(106)

Part Number, and the Keithley Part

The complete name and address of

CODE-TO-NAME

a

ohm

pica (10-12) Fc Poly

Printed circuit

Polystyrene

Ref.

TCu

”

w ww WW”ZlC

Tinner Cappeweld volt

wate Wirewound Wirewound Variable

7-2.

ELECTRICAL SCHEMATICS AND DIAGRAMS.

Schematics and diagrams are included to describe the electrical circuits as discussed in Section 4.

7-3.

HOW TO USE

THE

REPLACEABLE PARTS LIST. This Part6 List is arranged such that the individual types of components are listed in alphabetical order. Main Chassis parts are listed followed by printed circ”it

boards and other subassemblies.

7-4.

HOW TO ORDER PARTS.

a. Replaceable parts may be ordered through the

TABLE 7-2.

Schematic Diagrams

Description

Electrometer Amp 6 Range Switching Power supply LSI Circuit, Digital Logic 6 Display

Autoranging

Amplifier, Integrator, Threshold Det. Isolated Output/Control Isolated Output/Control Isolated Output/Control Isolated Output/Control, Power Supply

Sales Service Department, Keithley Instruments, Inc. or your nearest Keithley representative.

b. “hen ordering parts, include the fallowing

information.

1. Instrument Model Number.

2.

Instr.lment Serial Number.

3. Part Descrip?io”.

4.

Schematic Circ”it Designation.

5. Keithley Part Number.

C. All parts listed are maintained in Keiehley spare parts Stock. Any part not listed can be made available upon request. Parts identified by the

Keirhley Manufacturing Code Number SO164 should be

ordered directly from Keithley Instruments, Inc.

Schematic No.

257648

257770

25778E 2577bD 25715D

2571bD

25717C

25823C

1175

37

REPLACEABLE PARTS

MODEL 616

TABLE 7-3.

circuit Designation series

Itern NO.

__ __

1 2

3 4 5

6

7 8 9

10 11

-12

13

_-

14 15

-lb

17 18 19 20

series

DescriDtion circuit Desig"ati.o"

100 Electrometer Amplifier

200

Power supply PC-321 300 Auto-Ranging Amplifier 300 Integrator, Threshold Det. 400 Digital Logic & Display

Mechanical Parts List

Deecripticm

Chassis Assembly

Front Panel Assembly

Front Panel Screw, Slotted,

b-32 x 318

Front Panel Overlay

Rear Panel

Side Extrusion Left Side Extrusion Right

corner Bracket

Screw, Phillips, b-32 x l/2 Screw, Phillips, b-32 x l/2

Clip for Side Dress

Side Dress Panel

Top Cover Assembly

Top Cover

Screw, Phillips, b-32 x 5/16

Bottom Cover Assembly

Bottom Cover Screw, Phillips,

b-32 x

5/16

Feet Assembly

Fee* Ball

Tilt Bail

Screw, Phillips,

b-32

Kep Nut, b-32

TABLE 7-4.

Qty. Per Assembly

PC-321,361 PC-324

PC-324

PC-322,323

Keithley Part No.

-_-

1 25770B

4

--

1 25598B 1

2570bB 1 25773B 1 * 4 4

25772B

24745B

--

2 FA-101 2 243bOB

1 4

-_

25771C

__

25564B

2556X

--

4

24322B

4 FE-6

1

4 4

171478

__ _-

Paue No.

40

2: 44 45

Fiuure No. 32

33

38

0476

MODEL 616

REPLACEABLE PARTS

1175

FIGURE 32.

FIGURE 33.

Chassis Assembly - Exploded View.

Bottom Cover Assembl’y.

39

REPLACEABLE PARTS

MODEL 616

Cl01

Cl02 Cl03 Cl04 Cl05

Cl06 Cl07 Cl08 Cl09

Cl10

Cl11 Cl12 Cl13 Cl14

Cl15

DlOl D102

D103

0104

JlOl

5102

5103

5104

J105

5106

5107

5108

J109

JllO

Jill

5112

5113

5114

5115

5116

5117

5118

5119

5120

5121

5122

5123 KlOl

COMPONENT

DESIGNATION LISTING

Parts Shown on Schemaeic No. 257643

capacitor, 5 pF, 2oov. Poly Capacitor, 10 pF, 5OOV, Poly Capacitor, 22 pF, 5OOV, Poly

Capacitor, 47 pF, 5OOV, Poly Capacitor, 100 pF, 63OV. Poly Capacitor, 100 pF, 63OV, Poly

Capacitor, 100 pF,

63OV,

Poly

Capacitor, 0.1 ,,F, ZOOV, Poly Capacitor, 0.01 "F, 63OV, Poly Caoacitor, 0.001 uF, 63OV. Polv C&citor; 100 pF, 63OV, Poly Capacitor, 270 ,,F, bV, ETT

See page 46

Capacitor, 0.02 j,F, lOOOV, CerD

capacitor, 10 PF, lOOOV, CerD

Diode Diode

Diode

Connector, Card-Edge, 15-pin

(Mates

with PC-323) Connector, Card-Edge, 15-pi" (Mates with PC-323) Connector, Card-Edge, 22-pin (Mates with PC-324) Connector, Card-Edge, b-pin (Mates with PC-325)

(Shown an Schematic no. 257788) (Shown on Schematic no. 25778E) (Shown on Schematic no. 257783) (Shown on Schematic no. 257783)

Connector, 5-pin

(Shown on Schematic no. 257788) Connecmr, 3-pin Ca""ector, lo-pin

Used on Model 6162 Used on Model 6162 Used on Model 6162 Co""ector, lo-pi"

(Shown on Schematic no. 2577bD) Binding Post, White (Xl) Binding Post, Blue

Connector, Triaxial

(GUARD)

(INPUT)

Connector, Binding Post, Black (LO)

Connector, Binding

Post,

Black

(LO)

Post, Green (GND)

Relay (Zero Check)

Keithley Part No. Locarion

c31-5P C138-1OP C138-22P C138-47P C252-1OOP C252-1OOP C252-1OOP C251-.lM C252-.OlM C252-.OOlM

C252-1OOP C194-270M

. . .

C22-.02M Cb4-1OP

RF-28 RF-28 RF-28

RF-14 cs-259 cs-259 CS-241 65-267

. . . . . .

CS-251

CS-270

CS-237

. . . . . .

Range Switch Range Switch Range Switch Range Switch Range Switch Range Switch Range Switch Range Switch Range Switch Range Switch Range Switch PC-321

PC-361 PC-321

Range Switch PC-321

PC-321 PC-321 PC-321 PC-321

PC-321

PC-321 PC-321

.*. . . . . . . . . .

PC-321

Front Panel Front Panel

*.*

.

. . .

CS-237

BP-11

BP-11 CS-181

BP-11BLK

BP-11GRN

SOL-7,RL-45

Front Panel

Rear Panel Rear Panel

Front

Rear Panel Rear Panel Rear Panel

Chassis

Panel

PlOl PlO2 P103 P104

P105

PlOb

P107 P108

P109 PllO Plll P112 P113

P114

P115 Pllb

40

Connector, Card-Edge (PC-323) Connector, Card-Edge (PC-323) Connector, Card-Edge (PC-324)

See paga 46 Connector, Male (10 pins) connector, Male (10 pins) Connector. Male (10 pins) Connector, Male (10 pins) Connector, Male (5 pins) Connector, Male (5 pins)

Connector, Male (3 pins)

Connector, Male (10 pins) Connector, Male (5 pins)

(Shown on schematic no. 257783) Co""ector, Male (10 pins) Connector, Male (10 pins)

. . . . . . . . .

. * .

cs-340-10-x

cs-340-10-x cs-340-10-x cs-340-10-x cs-340-5-x cs-340-5-x cs-340-3-x

CS-340-10-x cs-340-5-x

. . .

cs-340-10-x

PC-323 PC-323 PC-324

PC-361 PC-321

PC-321 PC-321 PC-321 PC-321 PC-321

PC-321 PC-321 PC-321

. . .

PC-321

0577

MODEL 616

REPLACEABLE PARTS

ClX"lt Desk.

QlOl

Q102 4103 Q104 Q105

q106 Q107

QUO1 it101

RI02 R103 R104

RI05

R106

R107

R108 R109 RllO Rlll R112 R113 Rl14 R115 R116

RI17 Ill18 R119 RHO R121 R122 RI23 R124 R125 R126

RI27

RI28

R129

R130

Parta Shown on Schematic Na.

DesCripLfo"

see page 44 see page 44 see page 44

see page 44 Transistor, NPN Transistor, PNP

see page 44

,

1m, O.l%, 1/2w, MtF lOK0, 0.1%. 1/2W, MtF lOOKR, O.l%, 1/2w, MtF

lOOfa, O.l%, l/ZW, MtF

lOMfi, 0.1%. 1/2W

101b, +3Y -.57 Megox 1o*g 5%. 1/2w 200n, I%, 1/8W, MtF Potentiometer, ZKQ, 0.6W 10Kn. 0.1%. 118W. MtF lOfl, l%, 1/8W, MtF 9000, O.l%, 1/8W, MtF lOOR, O.l%, 1/8W, MtF Potentiometer, 1KR (ZERO)

Resistor, lOK0, l%, 1/8W, MtF

Resistor, 4.02KO, l%, 1/8W, MtF Resistor, 4.02Kn, l%, 1/8W, MtF Resistor, 39.2KR. 1%. 1/8W, MtF

Resistor, 20Kn, I%, 1/8W, MtF Resistor, 20Kn, 1%. 1/8W, MtF

a, 0.

,.,~

COMPONENT DESIGNATION LISTING

25764

Ke thley k Part No.

TG-103 TG-102

R221-9.99 R221-100 R169-1K R169-10K R169-100K R169-100K R174-10M R14-100

Y

;;,';I;,"10 R222-1011

R180-108 R88-200 RP94 R168-1OK R88-10 R168-900 R168-100 RPlOO-1K

R88-10K RBB-4.02K

R88-4.02K R88-39.2K R88-20K R88-20K

Locatlan

PC-321 PC-321

Range Switch SlOl Range Switch SlOl Range Switch SlOl Range Switch SlOl Range &itch SlOl Range Switch SlOl Range Switch SlOl

Range Switch SlOl

Range Switch SlOl Range Switch SlOl Range Switch SlOl PC-321 PC-321 PC-321 PC-321 PC-321 PC-321

Front Panel

PC-321 PC-321 PC-321 PC-321 PC-321 PC-321

SlOl s102 s103

1175

Switch, Rotary (RANGE)

Switch, Toggle (ZERO CHECK) Switch, Toggle (FAST/NORMAL)

SW-368 SW-309 SW-366

Front Panel Front Panel Front Panel

41

REPLACEABLE PARTS

MODEL 616

COMPONENT DESIGNATION LISTING

Parts Shown on Schematic No. 25777D

ClrCUlt iksig.

a01 c202 C203 C204 C205 C206 C207 C208 c209 CZlO c211 c212

C213 C214

C215

C216 C217 C218 c219 c220 c221 c222 C223 C224

0201 II202 D203

D204 D205 D206 D207 D208 D209 D210

DescriDtlan

Capacitor. 4.7 uF, 35OV, EAL

Capacitor, 10 j,F, 35OV, EAL Capacitor, 4.7 uF, 35OV, EAL Capacitor, 10 pF, 35OV, EAL

capacitor, 200 !JF, 35v, EAL Capacitor, 39 !JF, 15V, Epoxy

Capacitor, 200 vF, 35V, EAL Capacitor, 100 PF, capacitor, 39 pF, 15v, Epoxy

Capacitor, 2OOO,,F, 15V, EAL

Capacitor, ZOOOuF, lSV, EAL capaci.tor, 100 pF, lOOOV, CerD

Capacitor, 400 uF, 35V, FAL

Capacitor, 10 uF, 2OV, ETT

Capacitor, 39 uF, 15V, Epoxy

Capacitor, 39 pF, 15V, Epoxy

Capacitor, 39 liF, 15V, Epoxy

Capacitor, 39 PF, 15V, Epoxy

Capacitor, 0.01 uF, lOOOV, CerD

Capacitor, 0.01 IIF, lOOOV, CerD

Capacitor, 0.01 "F, lOOOV, CerD

Capacitor, 4.7 uF, 2OV, ETT Diode

Diode

Diode Diode, Full-wave bridge Diode, Zener Diode Diode Diode Diode

Keithley *art NO.

C240-4.7M C240-10M C240-4.7M C240-10M C177-200M C228-39M C177-200M C64-1OOP C228-39M C210-2000M CZlO-ZOOOM C64-1OOP C212-400M C179-10M C228-39M

C228-39M C228-39M C228-39M

C228-39M c22-.olM c22-.olM c22-.olM c22-.olM

C179-4.7M

RF-38 RF-38 RF-38

RF-38

RF-36 m-7 RF-34 RF-34 RF-38 RF-38

L0cati.m

PC-321

PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321

PC-321

PC-321 PC-321 PC-321 PC-321 PC-321

PC-321 PC-321

PC-321

PC-321 PC-321 PC-321

PC-321

PC-321 PC-321

F201

P201 Q201

QA201

QA202

QA203

R201 R202 R203

R204

R205 R206 R207 R208 It209

R210

R211

R212

42

Fuse (117V) 3/16A, 3AG SLO-BLO Fuse (234V)

Connectqr, Receptacle

l/lOA,

3AG SLO-BLO

(Line

Power)

Transistor, PNP, Flat Package

Integrated Circuit, Voltage Regulator

Integrated Circuit, Voltage Regulator Resistor,

Resistor, Resistor, Resistor,

Resistor,

Reaietor, Resistor, Resistor, Resigtor, Resistor,

ReedstoT, Resistor,

1.21Kn, l%, 1/2W, MtF

3.OlKn. l%, 1/8W, MtF 22n. 10%. 1/4w. cmnr,

4.9&a, 0.x%, ifsw -

7.4Kn, O.l%, 1/8W

6.98K0, l%, l/SW, MtF

3.OlK0, l%, 1/8W, MtF

3.01Kn, l%, 1/8W, MtF

1.5K& 10X, 1/4W, Camp

3.01Kn. 1%. 1/8W, MtF lMn, lo%, 1/4W, Camp lMn, lo%, 1/4w, camp

Fu-29 FU-40

CS-254 TG-100

IC-25 IC-25

x-34 R94-1.21K

R88-3.01K R76-22 R176-4.99K R176-7.4K R88-6.98K

R88-3.01K

R88-3.01K R76-1.5K

R88-3.0lK R76-lM

R76-lM

Rear Panel Rear Panel

Rear

Panel

PC-321

PC-321 PC-321

PC-321

PC-321 PC-321 PC-321

PC-321 PC-321

PC-321

PC-321 PC-321

1175

MODEL 616

CirC"*t

Deslg. Description

COMPONENT DESIGNATION LISTING

Parts Shown on Schematic No. 257771)

Keithley *art No.

REPLACEABLE PARTS

L0cati0ll

s201 s202

Switch (117 - 234V)

Switch, Toggle (Power ON) SW-236 Front Panel

T201 Transformer

P108 P109 PI10 24249A P112 P114

.I101 5102 5103 5104

Connector, Male (10 pins) Connector, Male (4 pine) Connector, Male (5 pins) Connector, Male (10 pins) Connecfar, Male (10 pina)

Connector, Card-Edge, 15-pin (Mates with *C-323) connector, Card-Edge, 15-pin (Mates with X-323) ~anneccar, Card-Edge, 22-pin (Mates with PC-324) Connector, Card-Edge, 6-pin

(Mates

with PC-325)

SW-151 Rear Panel

TR-152 PC-321 24249A

24249A 24249A

24249A

cs-259

cs-259 CS-241 CS-267

PC-321 PC-321 PC-321 PC-321 PC-321

PC-321 PC-321 PC-321 PC-321

1175

43

REPLACEABLE PARTS

MODEL 616

COMPONBWT DESIGNATION LISTING

Part8 Shown on Schematic No. 257761)

CirCUit

Desig. Description c301

C302 c303 c304 c305 C306 C207 C308 c309 c310 c311

D301 D302 D303 D304

DN301 Q301

9302 q303 Q304 Q305 Q306 9307

QA301 QA302 QA303 qA304 QA305 qA306

Capacitor, 330 pF, lOOOV, CerD Capacitor, 39 ilF, 15V, Epoxy Capacitor, 39 uF, 15V, Epoxy Capacitor, Capacitor, 1 uF, lOOV, My capacitor, .0033 uF, 5OOV, CerD Capacitor, 39 uF, 15V, Epoxy Capacitor, 0.1 !,F, 25OV, MtF Capacitor, 0.33 uF, 5OV, CerT Capacitor, 0.01 uF, 5OV, MPC Capacitor, 0.01 ,,F, 5OV, MPC

Diode, Rectifier

Diode, Rectifier Diode, Rectifier Diode, Zener, 9V

Diode Network, B-pin DIP Transistor, Dual N-Channel J-FET, Case TO-71

Transistor,

Transistor, N-Channel, J-FBT, Case TO-18 Transistor, N-Channel, J-FET, Case TO-18 Transistor, N-Channel, J-FET, Case TO-18 Transistor, PNP, Case TO-92 Transistor, PNP, Case TO-106

Integrated Circuit, Amplifier, E-pin DIP

Integrated Circuit, Amplifier, 8-pin DIP

Integrated Circuit, Transistor Array

.0033 liF, 5OOV. CerD

N-Channel, J-FET, Case TO-18

Keithley Part No.

C64-33OP C228-39M C228-39M C22-.0033M C245-lM C22-.0033M C228-39M C178-.lx C237-.33M CZOl-.OlM C201-.OlM

RF-28 RF-28 RF-28 DZ-41

DN-2

TG-98

TG-97 TG-97 TG-97

TG-97

TG-61 TG-110

IC-74 IC-76 IC-76 IC-77 IC-24

x-53

Location

PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC.324

PC-324 PC-324 PC-324 PC-324

PC-324 PC-324

PC-324 PC-324 PC-324 PC-324 PC-324 PC-324

R301 8302 R303 R304

R305

R306 R307 R308 R309

R310

R311 R312 R313

Resistor, 61.9K0, O.l%, 1/8w, MtF Resistor, 61.9Kn, 0.1X, l/SW, MtF Resistor, Potentiometer, lM0, .75w Resistor, Potentiometer, 500R. .75W Reeistor, Potentiometer, 5OOn, .75W Resistor, lKn, 1%. 1/8W, MtF Resistor, Potentiameter, lKn, .75W Resistor, Potentiometer, lOKs1, .75W Resistor, Potentiometer, lKn, .75W

Resistor, ZKR, 1%, l/SW, MtF

Resietor, Potentiometer, 2KG Resistor, lOw1, lo%, 1/4W, Camp Resistor, 80.6Kn. l%, l/EW, MtF

RN301 Resistor Network, Thick-Film (Revised) RN302 RN303 RN304 Reeietor Network, Thick-Film, 14-pin DIP

* Revised, RN-301-B Changed to 49.6Mn

Resistor Network, Thick-Film Resistor Network, Thick-Film, 16-pin DIP

P103 Connector, Card-Edge (PC-324) P112 Connector, Male (lo-pins)

5103 5117

Connector, Card-Edge, 22-Pin (Mates with PC-324)

Connector, Binding Poet, Red (1")

R168-61.9K R168-1Mn RP89-500K RP89-500 RP89-500 R88-1K RP89-1K RP89-10K RP89-1K R88-2K RP89-2K R76-10K R88-80.6~

TF-15* TF-5 TF-2 TF-3

24249A

cs-241

BP-1lR

PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324 PC-324

PC-324 PC-324 PC-324 PC-324

PC-324 PC-321

PC-321

Rear

Panel

44

0577

MODEL 616

REPLACEABLE PARTS

COMPONENI DESIGNATION LISTING

Parts Shown on Schematic No. 25778s

c401 C402

C403

c404 D401

0402 D403

0404 D405 D406

ON401 DN402 DN403 DN404 DN405

DN406 .I101

5102 5103 J105 5106 5107 not3 .I110 5115

PlOl PlO2 P105 P106 P107 P108 PllO

P112

P113 P114

capacitor, O.OlUF, 500". Cer.D

Capacitor, O.Ol,,F, 5OV, MPCb

capacitor, 4.7!lF, zov, ETT

capacitor, 4700 PF, 500 V,CerD

Diode, Rectifier

Diode, Rectifier Diode, Rectifier

Diode, Rectifier

Digital Display (OVERRANGE) Digital Display (seven-segment)

Digital Display (Seven-segment)

Digital Display (Seven-eegment)

Digital Display (Seven-segpnent)

Digital Display (Seven-segment)

Card-Edge, 15-pin (Mates with PC-323) Card-Edge, 15-pin Card-Edge, 22-pin

lo-pi" lo-pi" lo-pi" lo-pin 5-pin

(Used on Model 6162)

Card-Edge (PC-323)

Card-Edge (PC-323) Male (10 pins) Male (10 pins)

Male (10 pins)

Male (10 pins) Male (5 pins) Male (10 pins) Male (5 pins) Male (10 pins)

C22-.OlM c201-.om c179-4.7LI

c-22-47OOP

RF-28 RF-28

RF-28 RF-28 RF-28 RF-28 DD-15 DD-I4 DD-14 DD-14 DD-14

DO-14

cs-259 cs-259 CS-241 CS-237

CS-237

CS-237 CS-237

CS-251

24249A

PC-323 PC-323

PC-322 PC-323 PC-323

PC-323

PC-323 PC-323

PC-322

PC-322 PC-322 PC-322 PC-322 PC-322

PC-321 PC-321 PC-321 Display Cable Display Cable Display Cable Display Cable

s401

PC-321 PC-321

PC-322 PC-322 PC-321 PC-321 PC-321 PC-321 PC-321 PC-321

Q401 Q402 Q403 Q404 9405 Q406 Q407 Q408 9409

Q410 Q411 Q412

QA401 QA402 QA403 QA404 QA405

QA406 QA407

QA408 QA409

0577

Transistor, NPN, Case TO-92 Transistor, NPN, Case TO-104 Transistor, NPN, Case TO-104 Transistor, PNP, Case TO-92 Transistor, PNP, Case TO-92 Transistor, PNP, Case TO-92 Trannistor, PNP, Case TO-92 Transistor, PNP, Case TO-106 Transistor, PNP, Case TO-106 Transistor, PNP, Case TO-106 Transistor, PNP, Case TO-106

transistor, PNP, Case TO-106 Integrated Circuit, Hex Inverter, 14-pin DIP

Integrated Circuit, Quad &Input, NOR 14-pin DIP Integrated Circuit, Quad NAND, 14-pin DIP Integrated Circuit, Hex Inverters, 14-pin DIP Integrated Circuit, Hex Inverters, 14-pin DIP Integrated Circuit, 'Timing Logic, B-pin DIP Integrated Circuit, Triple 3-Input NAND, 14-pin DIP Integrated CLrcuit, LsI, 28-pi,, DIP Integrated Circuit, Hex Inverter, 14-pin DIP

X-62 'X-68 W-68 TC-90 TG-90 TG-90 X-90 X-66 Z-66 X-66 'X-66 n-110

IC-62 IC-69

IC-22

K-45 IC-45 IC-71 IC-68

LSI-2

IC-62

PC-321

PC-323 PC-323 PC-223 PC-323 PC-323 PC-323 PC-323 PC-323 PC-323 PC-323

PC-323

PC-323 PC-323 PC-323

PC-323

PC-323 PC-323 PC-323

45

REPLACEABLE PARTS

circuie De&g.

DCXriptiO"

COMPONENT DESIGNATION LISTING

parts show" o" Schematic NO. 257788

Keithley Part Na.

MODEL 616

Location

R401

R402 R403 R404 R405 R406 R407 R408 R409 R410 R411 R412 R413 R414

R415 R416 R417 R418

RN401 RN402 RN403 RN404 RN405

5401

Resistor, l.lKR, lo%, 1/4W, Come resistor. 845fl. 10%. 1/4W, Co"v

Resistor; 715n; l%,~l/&~MtF Resistor, 715n, l%, 1/8W, MtF Resistor, 4020, lo%, 1/4W, Comp Resiaeor, 4020, lo%, 1/4W, Camp Resistor. 402a. 10%. 114W. Come Resistor; 402a; 10%; 1/4W; Corn; Resistor, 12.4Kn, l%, 1/8W, MtF Resistor, 715n, l%, 1/8W, MtF Resistor. 3.01KO. 1%. 1/8W, MfF Resistor; l.lKfl,.l%,.l/8W,.MtF Resistor, 6.04Kn. l%, 1/8W, MtF ~esiator, ZOKn, l%, 1/8W, MtF Resiatar, 20Kn, 1%. l/gW, MtF Resistor, 20K0, l%, 1/8W,

Resistor, 2Ow, 1X, 1/8W, MtF Resistor, 2.2KR. lO%, 1/4w, camp

Resiator,Neewark, Thick-Film, 16-pin DIP

Resistor Network, Thick-Film, 14-pin DIP Resiseor Network, Thick-Film, Ill-pi" DIP Resist"= Network, Thick-Film, 14-pi" DIP Resistor Network, Thick-Film, 14-pi" DIP

switch, Rotary (SENSITIVITY)

MtF

COMPONENT DESIGNATION LISTING

Parts Show" o" Schematic No. 257643

;;6gI;i:K

RSS-715 R88-715 R88-402 RSE-402 R88-402 RSS-402 RES-12.4K R88-715 R88-3.01K R88-l.lK RES-6.04K

R88-20K R88-20K R88-20K R88-20K R76-2.2K

TF-41 TF-16 TF-18 TF-19 TF-40

SW-367

PC-322

PC-321 PC-323 PC-323 PC-321 PC-321 PC-321 PC-321 PC-323 PC-323 PC-323

PC-323 PC-323 PC-321 PC-321 PC-321 PC-321 PC-321

PC-322

PC-323 PC-323 PC-323 PC-323

Front Panel

circuit Desig.

Cl13 PI04

4101 Q107 QlOZA,a 4103 Q104

QlOl

Rl20

R121 R122 R123 ~124

Descrfptia"

Capacitor, O.OOluF, lOOOV, CerD

Card Edge, PC-361 Transistor, FET, Case 'CO-18, Selected TG-51

Transistor, FET, Case TO-18, Selected TG-51 Transistor, Dual NPN Transistor, NPN, Case TO-106 Transistor, NPN, Case TO-106

Integrated Circuir, B-pi" DIP

Resistor, 75kfl. O.l%, 0.3W Resistor, 75k0, O.l%, 0.3W Resistor, 1000, O.l%, 1/8W, MtF Reeistor, 2000, 0.75W, Cermet Resistor, lOOkn, 10%. 1/4W, Camp

Keithley Part No. Incation

C64-.OOlM PC-361

>

26612A

<

Matched Pair

TG-91 TG-39 TG-39

IC-74 R212-75K

R212-75K R168-100 RP89-200 R76-100K

PC-361 PC-361

PC-361 PC-361 PC-361 PC-361 PC-361

PC-361 PC-361

PC-361 PC-361 PC-361 PC-361

46

1175

MODEL 6162

REPLACEABLE PARTS

COMPONENT DESIGNATION LISTING

Parts Shown on Schematic 25715D

circuit

twig. Description

Cl01

DlOl 0102 D103 D104 D105 D106 0107

QlOl QlO2 Q103

QAlOl Integrated Circuits, QA102 Integrated Circuit, QA103 Integrated Circuit, QA104 Integrated Circuit, QA105 QA106 Integrated Circuit,

QAlO7 QAlO8 Integrated Circuit, QA109 Integrated Circuit, QAllO Integrated Circuit, QAlll Integrated Circuit, QA112 QA113 Integrated Circuit, QA114 Integrated Circuit,

capacitor, 4llF, lOOV, My Diode

Diode Diode

Diode Diode Diode Diode

Transiatar, PNP, Case TO-106 Transistor NPN, Case TO-92 Transistor NPN, Case TO-104

Integrated Circuit. Integrated Circuit,

Integrated CIrcuIt,

Isolator, 6-pin DIP Isolator, 6-pin DIP Isolator, 6-pin DIP Isolator, 6-pin DIP Isolator, 6-pin DIP Isolator, 6-pin DIP

Isolator, 6-pi" DIP Isolator, 6-pin DIP Flip-Flop, TTL, lb-pin DIP Flip-Flop, TTL, 14-pin DIP Quad NAND. 14-pin DIP

l&x InverCer,

Hex Inverter,

Hex 1nvereer,

i4-pi" DIP 14-p** DIP 14-p** DIP

Mfr.

Code De&g.

14752

ITT ITT ITT ITT ITT ITT ITT

FAIR

MOT 2N5089 TG-62

RCA 2N5183 07263

07263 07263 07263

07263 07263 07263 07263 01295 01295 04713 04713 04713 04713

Mfr.

230BlB505 C245-4M lN87

lN87 lNS7 lN87 lN87 lN87 lN87

2N5139 TG-66

FCD820 IC-82 FCD820 X-82 FCD820 IC-82 FCDSZO IC-82 FCD820 FCD820 IC-82 FCD820 IC-82 FCD820 SN74L74N SN74L74N

MC858P

MC836P

Keithley

Part No.

RF-39 RF-39 RF-39 RF-39 RF-39 RF-39 RF-39

TG-68

IC-82

IC-82 IC-87 X-87

IC-52

IC-80 X-80 IC-80

RlOl R102 R103 R104 Rlo5 R106 R107 RlO8

R109 RllO Rlll R112 R113 R114 R115 R116

RN101 Resistor Network, Thick-Film, 14-pi" DIP TF19-4.7K

PlOl Connector, Male (10 pins) 24249A

P102 P104 Connector, Male (IO pins) 24249A P105 Connector, Male (10 pins)

P108 Connector, Male (10 pins)

Resistor, 3.3K,,, 10X, 1/4W, Comp Resistor, lKn, 10%. 1/4W, Camp Re&?iBmr, 4.7KR, 10x;, 1/4w, camp Not Used

Not Used Not Used Resistor, 3300, 10%. 1/4w, camp Resistor, lOKJl, 10x, 1/4w, camp

Resisrar, 330*, 10x, 1/4w, camp Redstor. 33on, 10x, 1/4w, camp Resistor, 33on, lo%, 1/4w, camp Resistor, 330*, lO%, 1/4w, camp Resistor, 3300, lO%, 1/4w, camp Resistor, 330n, 10X, 1/4W, Camp Resistor, 2.5MG. 10%. 1/4W, Camp Resistor, lOKn, l%, 1/8W, MtF

Connector, Male (5 pins) 242498

Variable

A-B A-B CB-102-10% A-S

01121 01121 01121 01121

01121

01121 01121 01121

IRC

CB-332-10% R76-3.3K CB-472-10% R76-4.7K

CB-331-10% R76-330

CB-103-10% R76-10K CB-331-10% CB-331-109: R76-330 CB-331-10X R76-330 CB-331-10% CB-331-10% CB-331-10%

CEA-TO-1OK

R76-1K

R76-330

R76-330 R76-330 R76-330 RPlOl-2.5M R88-10K

2424911 24249A

0476

47

REPLACEABLE PARTS

MODEL 6162

COMPONENT DESIGNATION LISTING

Parts Show" on Schematic No. 257161)

C201 c202 C203

0201 D7.02 D203 D204 0205 D206

P108 q201

Q202 QA201

QA202 QA203 QA204 QA.205 QA206

QA207

qA208

QA209

QA210 QA211

QA212

QA213 QA214 QA215 QA216 qA217 qA218

QA219

QA220

QA221 QA222 QA223 QA224 QA225 QA226 QA227 QA228

qA229

Capacitor, O.OOluF, 25OV. MtF

Capacitor, O.OOlvF, 25OV, MtF

Capacitar, O.OOlvF, 25OV, MtF Diode

Diode

Diode Diode Diode

AMPX AMPX

AMPX

ITT ITT ITT ITT

ITT ITT

C28OAE C280AE CZBOAE

lN87 lN87 lN87 lN87

lN87

lN87 connecror, Male (10 pins) Transistor, NPN, Case TO-92 MOT 2N5089

Trensistor, NPN, Case TO-92

Integrated Circuit, BCD Counter, TTL, 14-pi" DIP

Integrated Circuit, BCD Counter, TTL, 1Cpin DIP Integrated Circuit, BCD Counter, TTL, 14-pi" DIP Integrated Circuit, Quad Latch, TTL, 16-pin DIP Integrated Circuit, Quad Latch, TTL, 16-pi" DIP Integrated Circuit, Quad Latch, TTL, 16-pin DIP Integrated Circuit, Quad Latch, TTL, 16-pin DIP Integrated Circuit, Monostable, 14-pin DIP Integrated Circuit, Monastable,

Integrated Circuit, Monostable,

14-pin DIP

lbpin DIP Integrated Circuit, Dual Flip-Flop, ll-pi" DIP Integrated Circuit, Dual Flip-Flop, Il-pi" DIP

MOT

TEXAS TEXAS

01295 02763 02763 02763 02763 01295 01295 01295 01295 01295

2N5089 SN74L90N

SN74L90N

SN74L90N 93L1459X 93L1459X

93L1459X

SN74L122N

SN74L73N

SN74L74N

Not Used

Integrated Circuit, Hex Inverter, Ill-pi" DIP Integrated Circuit, Hex Inverter, 14-pin DIP

01295 SN74L04N 01295 SN74L04N

Not Used

Integrated Circuit, Hex Inverter, ll-pin DIP

04713

MC836P IC-80

Not Ueed

Integrated Circuit, Quad NAND Sate, 14-pin DIP Integrated Circuit, quad NAND Sate, 14-pi" DIP Integrated Circuit, quad NAND Sate, Ill-pi" DIP InreSrated Circuit, Quad NAND Sate,,U-pin DIP

Integrated Circuit, Dual NAND, 14-pin DIP Integrated Circuit, Isolator, 6-pin DIP

Integrated Circuit, Isolator, 6-pin DIP Integrated Circuit, Isolator, 6-pin DIP Integrated Circuit, Isolator, 6-pin DIP Integrated Circuit, Isolator, 6-pin DIP Integrated Circuit, Isolator, 6-pin DIP

04713 04713 04713 04713 04713 07263 07263 07263 07263 07263

07263

MC858P

MCS58P

MC858P

MC18OOP

FCD820

FCD820 FCD820 FCD820 FCD820

C178-.OOlM C178-.OOlM

C178-.OOlM RF-39

RF-39 RF-39 RF-39 RF-39 RF-39

24249A TG62

TG-62

IC-84 IC-84 X-84 x-90 IC-90 IC-90 IC-90 IC-83 IC-83 X-83 X-86 X-87

IC-85

X-85

IC-52 X-52

IC-52 IC-52 K-89 IC-82 X-82 IC-82 X-82 X-82 IC-82

R201 R202 R203 R204 R205

R206 R207 R208 R209 R210 R211 R212 R213 R214

RN201

48

Resistor, 33on, 10x, 1/4w, camp Re.ei*tOr, 33on, 10x, 1/4w, camp Resietor, 33Ofl, 10X, 1/4W, Comp

Resistor, 33Os?, 10%. 1/4W, Cymp

Resistor, 33011, 10%. 1/4w, camp

Resistor, 3300, 10%. 1/4w, camp Resistor, 1m, 10%. 1/4w, camp Resistor, lKn, 10X, 1/4W, Comp Resistor, lOKO, lo%, 1/4W, Camp Resistor, lOKn, lo%, 1/4W, Camp Resistor, lOKn, lo%, 1/4W, Camp Resietor, lOK& lo%, 1/4W, Coup Resistor, lOK& 10X, 1/4W, Comp Resistor, lOKn, 10%. 1/4W, Comp

Resistor Network

01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121

CB-331-10X

CB-331-10% CB-331-10% CB-331-10%

CB-331-10X

CB-331-10X CB-lOPlO% CB-102-10X

CB-103-10X CB-103-10X

CB-103-10X

R76-330 R76-330

R76-330 R76-330 R76-330

R76-330 R76-1K R76-1K R76-10K R76-10K R76-10K R76-10K R76-10K R76-10K

TF19-4.7K

1175

MODEL 6162 REPLACEABLE PARTS

COMPONENT DESIGNATION LISTING

Parts Shown a" Schematic No. 25717C

circuit

De&. 0301

D302 D303 D304

P103 P105 P106 P107 connector, Male (10 pins) P108

QA301 Integrated Circuir, Quad NAND QA302 QA303 QA304 QA305 Not Used QA306 QA307

RN301 Resistor Network

CirC”it Des&g.

Description Germanium, ZO", 50 mA

Germa"i"m, ZO", 50 m.4 Germanium, ZO", 50 UlA Germanium, ZOV, 50 mA

connector, Male (10 pins) Co""ector, Male (10 pins) connector, Male (10 pins)

connector, Male (10 pins)

Integrated Circuit, Quad NAND Integrated Circuit, Decoder, 16-pin DIP Integrated Circuit, Quad Latch, 16-pin DIP

Integrated Circuit, Quad NAND Integrated Circuit, Quad NAND

Parts Shown on Schematic No. 25823C

Description

Mfr. Code

15238 15238 15238 15238

04713 04713 01295 02763

04713 04713

COMPONENT DESIGNATION LISTING

Mfr. Code

Mfr.

lksig.

lN3592 lN3592 lN3592

IN3592

MCSSSP

MCS58P

SN74L42N

93L1459X MC858P

MC858P

Mfr. Dzsig.

Keithley Part No.

RF-39 RF-39 RF-39 RF-39

2424911

24249A

24249A 24249A

U-52

IC-52

X-88

IS90

IC-52 H-52

TF19-4.7K

Keithley

Part NO.

c401 C402 c403 c404 c405 C406 c407

C408 c409 c410 c411 C412

D401 D402

DS401

F401

P401

QA401

s401

S402 T401

5401 5402

O.luF, 25OV, MtF 2000uF, 15v, EAL 2000UF, 15v, EAL 39°F. 15V. E~XV 391F; 15v; Epox; 39uF, 15V, Epoxy 39!dF, 15v, Epoxy 17554 39uF, 15V, Epoxy 39uF. 15v, Epoxy 39pF. 15v, Epoxy

39,,F, 15V, Epoxy 17554

39uF, 15V, Epoxy

Amber 07294 CF03ACS1869 PI.-51

Fuse, Sl0-BlO 3AG, 1/8A

connector, Power Input Integrated Circuit, Regulator Switch, Line Voltage (117V-234V)

Switch, Power ON Transformer

connector, Binding Post (Green) GR"UND connector, Binding POSt ("lack) LO shorting Link (Used between J401 and 5402)

73445 29309 29309 17554 17554 17554

17554 17554 17554

17554

13327 1134139 13327 1134139 RF-34

71400

82389

12040

. .

CZSOAE JCN200015SP

JCN2000158P TD401539610 TD401539610 TD401539610

'I'D401539610

TD401539610

TD401539610 TD401539610 TD401539610 I'D401539610

MDL

EAC301

LM309K

C178-.lM C210-2000M C210-ZOOOM C228-39M C228-39M C228-39M C228-30M C228-39M C228-39M C228-39M C228-39M C228-39M

RF-34

F"-20

CS-254

K-34 SW-151

SW-236

TR-155

BP-11-GRN BP-ll-BLK BP-6

0577

49

REPLACEABLE PARTS

MODEL 616

TABLE 7-5.

tilectrical Pate J&t

NOTE:

The following list of electrical part.3 ie arranged

eo that all pats are grouped by subassembly such ee

printed circuit board, switch, front chassis, etc. Cam-

ponent layouts showing physical positian of each pert is furnished for each printed circuit assembly. The Keithley pert number should be used whenever replacement parte are ordered from Keithley Instruments or ire representatives.

MAIN CHASSIS - FRONf PANEL

MISCELLANEOUS

Keithley Quantity

Mfr.

circuit

Pert No. Per Assembly Description Mfr. Desig. Desig. 25579A 1 Knob Assembly (ZERO) 80164 ---- ---_

RPlOO-1K

1 Potentiometer (ZERO) 1KO

SW-236 1 Switch,

Toggle

(ON) 80164 ---- 5202

--___ ____

R119

SW-309 1 Switch, Tag@ (ZERO CHECK) 80164 ---- 5102 SW-367 1 switch, Rotary (SENSITIVITY) 80164 ---- 5401

25769A 1 Knob Assembly (SENSITIVITY) 80164 ---- ---SW-368 1 Switch, Rotary (RANGE) 80164 ---- SlOl

25573A 1 Knob Assembly (RANGE) 80164 ---- ---SW-366 1 switch (FAST/NORMAL) 80164 ---- s103

CS-181 1 c~nne~e~r, ~ria~id (INPUT) 95712

33050-2NT34

5120

RANGE SWITCH

CAPACITORS

Keithley quantity Pert No. Per Assembly Description Mfr.

c31-5P C138-1OP C138-22P C138-47P C25l-.lM C252-1OOP

C252-.001M

C252-.OlM

C64-1OP

1 1 1 1

t 1 1 1

SpF, ZOOV, Poly lOpF, SOOV, Poly 22pF, SOOV, Poly 47pF, 5OOV, Poly O.l!,F, ZOOV, Poly lOOpF, .63OV, Poly

.OOluF,

.63OV, Poly

.OlliF, .63OV, Poly

lOPF, lOOOV, cerll

00686 E1013-1 71590 CPR-1OJ 71590 CPR-22.3 71590 CPR-47s 97419 PYWR-.l@ 97419 B31360-A1101 97419 B31360-A1102 97419 831360~A1103

71590 DD-lOO-10%

RESISTORS

R169-1K R169-10K R169-100K R169-lM Rl74-10M R180-108 R221-9.99 R221-10 R222-10

8

R222-lOlo R222-1011

1 1 1 1 1 1

1 1 1 1

1 1

108a, 1%, 2w, DCb lKn, 0.1%. l/ZW, MtF

lOKn, 0.14, l/ZW, MtF lOOKR, 0.1X, 1/2W, MtF lMO, 0.1%. 1/2W, MtF lot-m, 0.1%. 1/2w, MtF 1080, 5%, 112~

9.99n, O.l%, low, ww logo, 0.1%. low, ww lo& +3z, -5%, Megox 10 n, +3%, -5%, Megox 1011n, +3%, -5%, Megox

91637 ~~-2-108 91637 MFF-1K 91637 91637 MFF-100K 91637 MFF-lM 14292 AME-70-1OM 07716 ~~~~2-108 02985 TS-low-g.99 02985 TS-lOW-100 00327 M51-10g

00327 MSl-lOlo 00327 MSl-1011

Mfr. Desig.

MFF-1OK

circuit

Deeig.

Cl01 Cl02 Cl03 Cl04 Cl08 C105,106,107,111 Cl10 Cl09

Cl15

R108 R103 R104 R105 R106 Rlo7

Rl12 RlOl R102 R109 RllO Rlll

50

1175

MDDKL 616

REPLACEABLE PARTS

MAIN CHASSIS - REAR PANEL

MISCELLANEOUS

Keifhley Part No.

Quantity

Per Assembly Description

Mfr. nesig. DesiS.

Mfr. CiD2"i.Z

BP-1IW 1 Binding Post, Wbite~(Xl) 58474 DFZl 5121, 5122 BP-UK 1 Binding Post, Red (1V) 58474 DF21 5123

BP-11BLK BP-IlBL" 1 Binding Post, Blue (GUARD) 58474 DF21 5119

BP-11GRN

BP-6 1 Shorting Link 24655 938-L

FH-11 1

FU-29 1 Fuse,

FU-40

SW-151

CS-254

CO-J 1 Line

2 Binding Post, Black (LO) 1 Binding Post, Green (CASE)

Fuse

Holder 75915 340877

3AG, Slo-Blo,

1 Fuse, 3AG, Slo-Blo, 234V,

1

Switch

(117 -

Receptacle,

Line Power

ll?V,

234V) 80164 s201

Cord

MOTHER BOARD

3/16A l/lOA

58474

58474 DF21

75915

75915 313.100s

a2389 EAC301 70903

DF21

313.187 F201 F201

P201

PC-321

Keithley

Quantity

Part No. Per Assembly Description

CS-236 69 cs-340-10 6 CS-241 1 CS-251 2 cs-259 2

CS-267

24249A

81

CS-270 1 DZ- 7 1 RP94-2K Trl-152 1

1

Female Pin connector, lo-pin Connector, Card-Edge, 22-pin connector, 5-pin Connector, Card-Edge. 15pin Connector, Card-Edge, 6-pin

Male Pill

CO"neCtOr, 3-pin, Mini-w Diode, Zener Potentiometer, ZKn, 0.6W Transformer

Mfr.

22526 22526 20052

71785 2522230240

22526

71785

71785 50-6%10

SO164

22526 65039-034

04713 18935

94211 50200S-2K

80164

Mfr. De&g.

47439

20370

2521530160

P112,114-116,107-108

5103

P109 5101,102 5104

Jill D206 R114

TlOl

Keithley

QULllltity

Part No. Per Assembly Description

c22-.olM czz-.02M C64-1OOP

Cl??-ZOOM

C179-1OM

C194-270M

C210-ZOOOM C212-400M

C228-39M

:240-4.JM

c179-4.7

C240-10

0778

4

O.Ol~F, lOOOV, CerD 1 0.02"P. 1ooov. CerD 2 lOOpF, lOOOV, CerD 2 1 1

ZOOPF, 35v, EAL

lOvF, 2OV. ETT

ZJOW,

6V, ETT 2 ZOOOUF. 15V. EAL 1 7

2

1

2

4OOuF, 35V, EAL 39uF, 15V. Epoxy

4.?uF, 35OV. SAL

4.7,,F, 20". ETT 10liF, 35OV, EAT.

CAPACITORS

Mfr.

Desig.

56289 loss-510 56289 lOSS-S20

71590 DD-loi-10% 90201 XTVZOON35 17554 TSD220106

06751 TD5006277-20

29309 JCN200015SP 29309 JC1240035SP 17554 TD401533610

24138 PCK4.7U5350

17554 24138 35OVnlO

CkX"ilC

DeSig.

C220,221,222,223 Cl14 C208,212 C205,207 C214 Cl12 c210,211 C213 C206,209,215,216,

21?,218,219

C201,203 C224

C202, C204

51

REPLACEABLE PARTS

MODEL 616

MOTHER BOARD

PC-321

Keithley Part NO.

IC-25 2 IC-34 1

Rib-22 Rm-a45 R88-402 R76-2.2K R76-1M R&3-10

R88-200

RS8-3.0x RSS-2.49K

RS8-6.9S.K

RSB-1OK R88-20K

R88-39.2K R94-1.21K R168-100 R168-900

R168-10K R176-4.99K R176-7.4K

R88-1.5K

Qvantity

Per Aesembly Description

Mfr.

INTEGRATED CIRCUITS

Voltage ReRulator, ICpin DIP Voltage Regulator, Case TO-3

RESISTORS

1

1 4

:

1

1 4 2 1 1 6

1

1 1 1

1

226?, 10x, 1/4w, camp 8450, 1X, 1/8W, MtF 402R, l%, l/SW, MtF

z.zKn, IO%, 1/4w, camp

lMn, lo%, 1/4w, camp lOfl, l%, l/BW, MtF zoon, 1%. l/SW, MtF

3.01m, 1x, UBW, IeF

2.49U, l%, l/SW, MtF

6.98101, 1X, l/SW, MtF lOm, 1%, 1/8W, MtF 2OKsi, l%, 1/8W, MtF

39.2K0, l%, 1/8W, MtF

1.2X.0, l%, l/ZW, MtF lOOn, 0.1%. 1/8W, MtF

soon; 0.1%;

lOKn, O.l%, l/BW, MtF

4.99103, O.l%, 1/8W

7.4F.h 0.1%. l/SW

1.5K ,

uaw; MtF

l%, l/SW, MtF

07263 12040

01121 01121 01121 01121

01121 07716 07716 07716

07716 07716 07716

07716

07716 CEC-1.21W2

91637 MFF-l/8-100

91637

91637 MMF-l/S-4.99KG

91637

00121

De&.

UGA7723393

LM309K

CB-220 CRA-TO-845

CEA-TO-402 CB-222 CB-105 CF.A-TO-100 CEA-TO-200n R113

CEA-TO-3.OlKn

CEA-TO-4.02Kn CEA-TO-6.98Kfi CEA-TO-lOK0

CEA-TO-LOKfl

CEA-TO-39.2KO

MFF-l/8-900 MFP-l/8-1OKR

MMF-l/8-7.4Kn

CEA-1.5K

circuit nesig.

QA201,202 QA203

R203 R402 R405, 6, 7, 8

R418 R211,212 R116

R202.207.208.210

R126;127.

R206 R125 R129,130,414,415,

416,417 R128 R201 R118 R117 R115 R204 R205

F.209

RF-14 RF-28 RF-34

RF-36

RF-38

TG-62 TG-100 TG-105

TG-93 R-l-220K

R76-10K R76-1K

DIODES

1 3

2 1 8

1 1

2 2

4 2 1

Rectifier, 4OOmA, 225V Rectifier Rectifier Four diode, full-wave bridge

Rectifier, l.OA, BOOV

TRANSISTORS

NPN, Case TO-92

PNP, Flat Package PNP, Case TO-5 04713 NPN, Case TO-5

220Ku, lOKv, lo%, 1/4w, camp

lKp,

10%. uzw, camp

10%. 1/4w, camp

TEXAS 18645 01295 lN914 13327 lN4139 83701 PD-10 04713 lN4006

04713 2N5089 04713 D45C3

&WPS§S2NS416

04713 m

2N3439 QlO%QlO8

D104

D101.102.103

D207-208.

0205

D201,202,203,204,

209,210,D105,106

Q401

Q201 Q106,Q109

Rl32,133,135,136 R131

R134

52

0778

S,~,.,“...

..,....,.

.._ ..~......... ~.

‘a ;

: ,,,....., .,

-.., ~,,.” -_ . ,.,,, ,. x -,--._ _‘.‘- -...,., ,... a: ,,^^___~ .,.. -.- .,..,,..,.,. .,.. ~~ ,..,,., ~~ ,,-...,, ~,, ~“,,.

.,_ .,.....,, ..,..,_

!

&

MODEL 616

REPLACEABLE PARTS

DISPLAY BOARD

PC-322

MISCELLANEO"S

Keffhley Quantity

Part No. R-76-l.lK 1

TF-41 DD-9 DD-11

Per Assembly Description

Resistor, l.lKn, 10%. 1/4W, Camp 1 5 1

Resistor Network, 16-pin DIP

Digital Display (Seven Segment)*

Digital Display (Overrange)*

*Light intensity "C", "D", or "E"

c22-.olM

CZOl-.olM

1 O.OlvF, 5OOV, CerD 1

O.OluF, 5OV, MPCb

CAPACITORS

Mfr. C*rC"it

Mfr. De&?. uesig.

01121

CTS

H-P H-P

72982 87125UO103M

14752 625Bl.A C402

CBIlZ-10% Special

5082-7730

5082-7732

R401

RN401

DN432,3,4,5,6 DN4Ql

c401

1175

FIGURE 36. ~mponenr ‘ayout,

PC-322.

55

REPLACEABLE PARTS MODEL 616

LOGIC BOARD

PC-323

INTEGRATED CIRCUITS

Keithley Part No.

IC-22 IC-45 IC-62 IC-68 IC-69 IC-71

LSI-2

R88-715

R88-l.lK 1 R&3-3.01K RBB-6.04K 1 6.04Kfl. l%, 1/8W, MtF 07716 CEA-6.04Kn R413 R88-12.4K 1

RF-28 5

quantity

Per Assemblv Description

1 2 2 Hex Inverter, 14-pin DIP 01295 SN7406 1 Triple 3-Input Positive NAND, 14-pin DIP 1 Quad Z-Input Positive NOR, 14-pin DIP 01295 SN74LOZN 1 Timing Logic, E-pin DIP 18324 NE555V QA406

1 Integrated Circuit

3 1 3.01K& l%, l/SW, MtF 07716 CEA-3.OlKn

Quad NAND, 14-pin DIP 04713 MCS58P Hex 1nverter.3, 1Cpin DIP

RESISTORS

7150, l%, l/SW, MtF

l.lKn,

12.4Kn, l%, l/SW, MtF 07716 CFA-12.4KQ R409

l%, 1/8W, MtF 07716 CEA-l.lKR R412

DIODES

Mfr. De&g. Desig.

01295 SN7403N QA404.405

01295 SN7412N

80164 -----

07716 CEA-715n

01295 lN914 0401, 403-406

Mfr. circuit

QA403 QA401,409

QA407 QA402

QA408

R410,403,404 R411

m-16

TG-66

TG-68

TG-90

TG-110

C22-.OlM

C22-4700P

C201-.OlM

RESISTOR NETWORKS

1

1 1 Thick Film, 14-pin DIP 1 Resistor Network, 14-pin DIP

4

2 NPN, Case TO-104

4

1 PNP, Case m-106

1 O.OlvF, 5OOV, CerD 1

Thick Film, Ill-pin DIP

Thick Film, 14-pin DIP

TRANSISTORS

PNP, Case TO-106

PNP, Case TO-92

CAPACITORS

4700PF, SOOV,CerD O.OluF, 5OV, MPCb

73138 1899-151.0 73138 1899-152-O

73138 899-l-RZK RN404 CTS Special

07263 2N5139 Q4OS,409,410,411 02735 2N5183 Q402,403

04713 2N404A Q~O4,405,406,407

07263 2N5140 Q412

72982 87125U0103M c401

14752 625BlA

RN402 RN403 RN405

c404 C402

56 0577

MODEL 616

REPLACEABLE PARTS

0577

FIGURE 37.

Component

Layout, PC-323. (Logic Board)

57

RANGING BOARD

PC-324

CAPACITORS

Keithley quantity Mfr. CiK"it Part NO.

Per Assembly Description

Mfr. Desig. tleslg.

MODEL 616

C64-330P C178-.1M CZOl-.OlM CZOl-.lM CZZS-39M C237-.33M C245-lb, CZZ-.0033M

m-2 Lx-41 RF-28

IC-24 x-53 IC-74 IC-76 x-77

R76-10K R88-1K RSS-2K R88-80.6K Rl68-61.9~ RP89-500 RP89-1K RP89-2K RP89-10K RP89-1Mn

1 1 1 1 3 1 1 2

330DF. 1oov. CerD O.lnF, 25OV; MtF O.Ol,,F, 5OV, MPC O.l!,F, 50". MPC 39UF, 15V, Epoxy

0.33pF, 50", CWF l.O,,F, lOOV, My

.0033$, 500". CerD

71590 In-331 c301 73445 C280AE C308 14752 625BlA.01 c310 14752 625BlA.l c311 17554 TO401539610 C302,303,307 72982 8131050651334M C309 14752 230818105 c305 72982 SOlZ5"0332M C304,306

MISCEILANEO”S

1 1 3

Diode Network, B-pin DIP

Diode, Zener, 9V

Diode, Rectifier

FSA2619M

DN301

06751 lN937 0304

02195 lN914

0301-303

1NTEGRATED C*RC”ITS

1 1 1 2 1

1 1 1 1 2 2 2 1 1 1

Analog Amplifier, S-pin DIP

Transistor Array, Ill-pin DIP Operational Amplifier, E-pin DIP Operational Amplifier, S-pin DIP Operational Amplifier, S-pin DIP

RESISTORS

lOKn, lo%, 1/4W, Camp IKO, 1%. l/SW. MeF ZKR, l%, 1/8W, MfF

80.6Kn, I%, 1/8W, M~F

61.9Kn, 0.1%. 1/8W, M~F Poeentfameter, soon, .75W Potentiometer, lKR, .75W Potentiometer, ZKfl, .75W Potentiometer, lOKn, .75W Potentiometer, lMn, .75"

12040 LM301AN QA305 02735 CA3086 QA306 32293 ITS6214 QA301 07263 Special

QA302,303

07263 Saecial QA304

01121 CB-103-104

R312 07716 CEA-lK0 R306 07716 CEA-2KR R310 07716 CEA-80.6Kn R313 91637 MFF-l/8-61.9Kn R301,302 73138 89P-5OOn R304.305 73138 89P-1Kn

R307,309 73138 89P-2KR R311

73138 89P-10Kn R308 73138 89%lM2.

R303

TF-2 TF-3 TF-5 TF-15

'IG-61 TG-97 TG-98 TG-110

58

RESISTOR NETWORKS

1 1 1 1

1 4 1 1

Thick-Film, 16-pin DIP Thick-Film, 1Cpin DIP Thick-Film, 16-pin DIP Thick-Fillll

PNP, Case TO-92 N-Channel J-FET, Case TO-18 Dual N-Channel J-FET, Case TO-71 PNP, Case TO-106

80164 80164 73138 80164

04713 32293

32293

07263

----- RN303

----- RN304

1898.64-O RN302

----- RN301

2N5087 q306 ITS3538A

ITS30092

q302,303,304,305

Q301

2N5140 Q307

0577

MODEL 616

REPLACEABLE PARTS

1175

FIGURE 38.

Conponent Layout, PC-324.

(Ranging Board)

59

REPLACEABLE PARTS

INPUT FET BOARD

PC-361

MISCELLANEOUS

MODEL

616

Keithley Part No.

C64-.OOlM IC-74

R76-100K R212-75K R168-100 RP89-200

TG39 TG91

26612A

quantity

Per Assembly Description

1 1

1

2 75Kfi,.O.l%,

1 1

2

1 1

Capacitor,

Integrated Circuit, S-pin DIP 32293 ITS6214

lOOKs2, 10x, lOOn, O.l%, 1/8W, MtF

2oon. .75w,

NPN, Case TO-106 Dual NPN, Case

Matched pair, FET, Case TO-18

.OOlpF, lOOOV, CerD

1/4w,

Camp

0.3w

cermet

(selected TG-51)

RESISTORS

TRANSISTORS

Mfr. Desk. Desig.

Mfr. circuit

72902

80800025R0

Cl13

qAlO1

01121 CB-104-10% R124 18612 V53-l-75KR

91637 MFF-l/8-100

73138

07263 2N3565

89P-2OOn

32293 IT121

RAY

RN1030

R120,121 R122 R123

Q103,104 Q102

q101, q107

FIGURE 39.

Component Layout,

~-361.

0476

MODEL 616

SCHEMATICS

Schematic diagrams are furnished to describe the Model 616 Digital Electrometer and the

Model 6162 Isolated Output Control.

MODEL 616

Schematic No.

25777D

25776~ 257643

257783

MODEL 6162

Schematic No.

25715D 25716D

25717C 25823C

Description Page

Power Supply

Autoranging Amplifier 64

Electrometer LSI Circuit,

Isolated/Output, Ranging Isolated/Output. Data Lines Isolated/Output, Decimal Point, Function 69 Power Supply for Model 6162

for Model 616

Amplifier Digital Logic

Description

63

65 66

Page

67 68

70

1175

61

/ -\

Y

r

-___---------------I

r--------------~~

I,

I-

-r--

t-+-i...:, 1

--t-T

l-l I I I I

I

I I

-

I T ..^.

I ..^.

I

_“.

llb3 + 6Ob3 + Lam+ sofa+

6f

- +

__ bOb3

GE--

SE-

c-- 6E--

6x--

+ 6”::

Z/*3 o/m + *om + 9om+

6f -7

KEITHLEY INSTRUMENTS, INC.

28775 AURORA ROAD

CLEVELAND, OHIO 44139

SERVICE FORM

MODEL NO.

NAME PHONE COMPANY ADDRESS CITY STATE

Describe problem and symptoms using quantitative data whenever possible (enclose

El

readings, chart recordings, etc.)

Show a block diagram of your measurement system including all instruments connected

El

(whether power is turned on or not). Also describe signal source.

SERIAL NO. P.O. NO. DATE

(Attach additional sheets as necessary).

-ZIP

El

EJ

El

List the positions of alJ controls and switches on both front and rear panels of the instrument.

Describe input signal source levels, frequencies, etc.

List and describe all cables used in the experiment (length, shielding, etc.).

List and describe all other equipment used in the experiment. Give control settings for each.

Environment:

Where is the measurement being performed? out-of-doors, etc.) What power line voltage is u Ambient temperature? Other

"F.

Variation?

(Factory, controlled laboratory,

OF. Rel. Humidity?

Additional Information. (If special modifications have been made by the user,

El

please describe below.)

REV 0774

Addendum

28039-B-l

Page 1 of 3 l/3/83

Instruction Manual Addendum Model 818 IXgital 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. Description Of Changes

Most changes included with this addendum concern the plug-in pre amp (PC-3611, which is replaced with one of two versions of the pre amp (PC-601 or PC-602). Additionally, some parts elsewhere in the instrument have been changed, added, or deleted.

The following schematic diagram has been ?JviSed and is included with this addendum: Electrometer Amplifier, drawing number 25764E. page 65.

Component Layout Changes

Delete Figure 39 of the manual (PC-361) end replace it with component layout drawing numbers

32048 (PC-601) and 32053 (PC-6021.

Parts List Changes

1, Delete the PC-381 parts list of the manual on page 60 and replace it with Table 1 of this addendum.

2. PC-321, parts list, page 51: Change parts as listed in Table 2.

Table 1. Parts List For PC-601 and PC-602

28039-B-1

Page 2 of 3

Circuit Desig.

Cl13

Cl17 QlOl” QlOl”” Q102 0103 Q104 Q107’

R120 R121 R122 R123 R124 R137 UlOl

*PC-802 only

“‘PC-601 only

t PC-321 must be modified if used in place of PC-361

Circuit Desig.

Cl12 Cl14 C206 c209 C214 C215 C216 C217 C218 c219 R128

Description Capacitor, 0.01&F, *20%, 5OOV. Ceramic Disc

Capacitor, 1OpF. *20%, lOOOV, Ceramic Disc Transistor, matched pair with Cl107 Transistor, Selected Transistor, Dual NPN, IT121 Transistor, NPN Silicon, 2N3565 Transistor, NPN Silicon, 2N3565 Transistor, matched pair with QlOl

Resistor, 75kn. 0.1%. l/low

Resistor, 75k0, O.l%, l/low

Resistor, lOOn, 0.1%. l/EW, Metal Film

Potentiometer, 2000, 0.75W Resistor, lOOk0, 5%,1 l4W. Composition Resistor, 20kR. 5%. 1 l4W. Composition IC, Operational Amplifier, 8-pin DIP, ITS8214 Pre Amp, assembled with all parts

Table 2. PC-321 Parts Changes

T

Action Changed

Changed Changed Changed Changed Changed Changed Changed Changed Changed Deleted

Description Capacitor, 25Op.F. 25V. Aluminum Electrolytic

Capacitor, 1OOOpF. 1OOV. Ceramic Disc Capacitor, 47pF. 18V, Aluminum Electrolytic Capacitor, 47f1F. 16V. Aluminum Electrolytic Capacitor, lO@F, 25V. Aluminum Electrolytic Capacitor, 47rF, 16V, Aluminum Electrolytic Capacitor, 47pF, 16V. Aluminum Electrolytic Capacitor, 47rF, 16V. Aluminum Electrolyitc Capacitor. 47wF. 18V. Aluminum Electrolytic Capacitor, 47pF, 16V. Aluminum Electrolytic

Keith@ Part No.

c-22-.01

C-64.1OpF A26812” A31484”” TG-91 TG-39 TG-39 A26612*

R-212.75k

R-168-100

RP-89-200

R-76-100k

R-76.20k

IC-74 * 32053t

Keithley Part No.

C-314-250

c-641OOOpF

C-321-47

c-314-10

C-321-47

Figure 39. Component Layout, PC-801

28039-B-l

Page 3 of 3

Figure 39. Component Layout, PC-602

*

b

I

. I I ’

1

<

-

:

KEITHLE17 INSTRUMEN’T’S. INC

P?tgelofl

0173

a.-

INSTRUCTION IUNUAL

CHANGE NOTICE

MODEL 616 DIGITAL ELECTROMETER

INTRODUCTION:

Since Keithley Instruments is continually improving product

performa~~nd~reliability, it is often necessary to make changes to

Instruction Manuals to reflect these improvements. Also, errors in' Instruc-

tion Manuals occasionally occur that require changes, Sometimes, due to printing lead time and shipping requirements, we can't get these changes imediately into printed Manuals. The following new change information is

supplied as a,supplement to this Manual in order to provide the user with

the latest improvements and corrections i? the shortest possible time.

Many users vi11 transfer this change information directly to a manual to minimize user error. All changes or additions sre indicated in ituzics.

CKANGES :

Page iv:

greater than

Specifications. ISOLATION:

ZOy ohms shunted by

Circuit Lo to chassis growxi;

500 picofarads (dzzrcasir,g ta iv

c&w at 30°C and 70% relative humidity).

‘I

Keithley 616 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual