Keithley 165 Instruction Manual

INSTRUCTION MANUAL

MODEL I65

DIGITAL MULTIMETER

0 COPYRIGHT 1975 KEITHLEY INSTRUMENTS, INC.

PRINTED JANUARY,

1977,

CLEVELAND, OHIO U. S. A.

CONTENTS

MODEL 165

CONTENTS

Tit12 Page .
CO”td”LS . . .
LiSC Of IllusCrac.ions. . .

Specifications . . . . .

1. General DeSCriprion
1-l. Introduction . .
l-2. warranty Information
1-3. Change sotice. . .

1-4. Features . . .

3. circuit Descripeion

3-1. General. . . . . . .

3-2.

*c-"o1cs Preamplifier. .

3-3.

DC-vo1rs PraamplFfLer. .

3-4. OhrnP circuitry . . . . .

3-5. 1-d currene source. .

3-b. DC-r\mps Preamplifier .
3-7.

*c-Amps Preamplifier . .
3-8. hipolar Amplifier . .

3-9. AD ConverCer . . . .

3-m. Clock. . . . . . . .

3-11. Logic. . . . . . . . .

3-12. Display. . . . . . . . .

1-13. Power supply . . . . . .

4

5
5
5
5
6

7
. 8
. 9

9

10

. 10
. 10
. 11

11
. 11
. 11

. 11
. 12
. 13
.

13

. 13
. 13

4. Accessories
4-1.

General. .

4-2. operating Instructions .
4-3. Model 1651 50-Ampere S~UOL
4-4.

Model 1653 Rack Mounting K~L

5. Maintenance

5-1. General. . . .

5-2. Recommended Tesr Equipment
5-3.

Performance YerificaLia" .

5-4.

Calibration. .

5-5. companenr an* Calibration

Layouts . . .

5-b.

some Semiconductor case ouc1ines

and Pin Identificarions .

5-7. Tra"bleshoati.ng. .

6. Replaceable P,,CS
b-l.

General. . . . .

b-2.

Electrical Schematics and

Diagrams. . . . . . .

b-3. How to "se the Parts list. .

b-4. How LO Order Parts . .

6-5. Chassis Pares List .

b-6.

Electrical Parts List. . .

6-7.

Mechanical Parts IAt.

b-8.

Code-to-Name List, . . .

7. scbmatic Diagrams

7-l.

253950 Block DFagram. . . . .

7-2. 2539ZE AC & DC Preampltiier

SwiCchtig . . . . . .

7-3.

253930 "*ipolar Amplifier 61

A-D canverrer . . .

7-4.

255080 Clack & Switching Logic.
7-5. 25511D Re y b Drivers. . .
7-6. 25394E Readout and logic.
7-7.

25391c Power supply . . .

15
15
15
15

16

16
16
20

27

29
31

34
34

34
34
35

35
49
50

52

53
54

55
56
57
58

ILLUSTRATIONS

‘ii

t .

SPECIFICATIONS

AS A DC VOLTMETER

SECTION 1.

GENERAL DESCRIPTION

I

h,.:, ,‘,I,.,.:\’

I4

165 AUTORANGING MULTIMETER

POWER ON CR”“Nu

INPUT INPUT

s-301 3403

‘0 HI SOURCE S40lA S4OlB

5402 3401

5402

CAL CONTROLS

ANALOG

CAL POWER LINE

LINE

FLiSE

OUTPUTS CONTROL INPUT SWITCH

SWITCH

F301

P304

5303

s302

MODEL 165

SECTION 2.

1. Tbermoelecrric Naise. Potentials generate*
by rhermal differences Bf rtle junction a= ,unctions
of Ed0 dissimilar metals are thermoelectric noises,
more commn1y called thermal mm. These potencia1s
may be significant when making millivolt or mic=o­volt mea*uremencs. TO minimize ehermal nOiS* --­which may appear as a drift --- caused by thermal
FXYO, use PUT* capper circuirry emi tswinaricms
thrau*iw*t the source an* in a11 connectians to
ehe 165.

The KeicNey accessory Model 1483 Low
Thermal Connection Kit contains all necessa=y ma­cerias for making very law-thermal copper connec­tions for minimir*n* tharmal mm..

2. AC Power Line Noise.

The presence of electric
fields generated by power lines o= other power
.9O"TceB can haYe an effect 0" inaaur,ent operarim.

Also ac vok?.ges presenr in Ehe BOUrCe which are
very large vith reapact. to the full-scale range
sensitivity of the Model 165 could drive the analog
amplifier into sa~uracio". producing an e==OneO"a
digiral display.

a). Shielding.

Proper shielding of the sowxe
or cabling can minimize noise pickup when the
instrument is in tile presence of large ac fields
or when very seneirive me*e"rements are being

rude. ‘ornoiae shielded cable, such as Keith+,

SC-9 cable, should do a sufficient job of shield­ing rhe inpur signal.

Metal shields may be re-

quired LO be installed arD""d the BOUIICB. me

shields of the inpur cable and source should be
connected together co ground at ooe point only,

typically at the input of the Model 165. This

one-point-ground method ia a frtree'f configuracio",
which minimi=es ground L,ape in the measured cir­cuiery.

Ground loops are a secondary source of
interfering noise Which may also be considered in
larle"el meee"reme"ts.

OPERATION

b). AC Ke,ecrim. The Model 165 provides
artenuation of line frequency noise superimpose*
on a dc input signal. The ac re,ection Of the
165 is specified as follows:

NOWL MODE kE.lECTION RATIO (NMI(Io: Greater

than

60

dB above one digit for a voltage of
line frequency o= twice line frequency with
at leas= 10% of full-range dc applied.

COMmN MODE REJECTION RATlO (cxea): 120 dB
on the 10 mv, 100 mv. and 1" ranges; 80 da 0"
the 10" range; 70 da on the 100" range; and
60 dB an the 1000" range; far a dc, 50 HZ, o=
60 Hz voltage with at least 10% of full-range
dc applkd.

3. Magnetic-fFeld Noise. The presence of strong

magnetic fields can be a possible so"=ce of obJec-

eionable ac noise. The Model 165 has been suffi­ciently sbialded from typical magnetic incerfarence;
however, additional shielding may be required at the
eo"rce or in the cabling to the 165. Magnetic flux
lines which cue a conductor --- like an input cable

--- can produce large ac noise, especially at power
line frequencies. me voltage induced due to nag­neric flux is proportional to the area enclosed by
the Circuit *s well as the rate of change of mag­netic flux.

POC example, the motion of a ,-inch
*iemeeer loop in the earth'. magnetic field will
induce a signal of several tenths of a microvolt.
The ac rejecrion characteristics of ebe Model 165
vi.11 help minimize specific effects of magnetio
fields.

Magnetic pickup may be furthe= minimized,
by arranging all so"=ce and input-cable wiring so
L&E the loop area enclosed 18 BB small as possible

(such as by rwisring input leads). "sing conetic

(magnetic) shielding in cables and around cirwia-j

may further help in seve=e cases.

b. Effective Shielding. Here are general shielding

rules fo consider far measurements in the three func­tion categories of the 165. Be sure that shielding
is even needed before proceeding.

1. Yolemeeer maaurements. Consider shielding
input leads when sou=ce resistances a=e g=eaCe= than
100 kilc,hm o= when long input cables are used. Avoid

even slight movements of input cabling a= Ct\e oource
when making high s.au=ce resistance measurements.

2. C"rrenC Mea8"reme"C*, on the mA and ii.4 current

ranges, generally no ape&a1 shielding precautions
need ba taken.

However, consider shielded input

leads for me~~"=ements an the lowese ranges.

3. Reeiscance *easuremenc*. Shielding Of the
input cabling and sou=‘ce may be necessary far meas-

"remente on the 10 megohm and 100 megohm ranges.

4

1073

.~.

P .

C. If 400 HZ line “OlrageS are LO be used, COnSUlt

the factory applications deparcmenr or your local
Keithley rrpresenrarive for instructions.

d. Turn ox power Switch 5301.

2-3.

CONNECTIONS. (refer ta Figures 2 and 3).

a. Innut. Three binding posts are provided an
the frO"C piln.21 LOT input connections. The cermina1s
are color-coded a* follows: red = input high (HI)
5401, black = input low (LO) ,402, and green = power­line ground (Clm) ,403. These terminals mace Wifh
individual "ban*"*" plugs similar LO Keichley Parr
NO. c-5, The from pane1 terminals are spaced with
,/Ii-inch bewee" centers to mate wit,, a standard

dual "banana" plug such as Keitbley Part No. Lx-,.

Banana-plug-co-alligator-clip cables (available
through my local electronics supply house), such as
two Keithley Part No. 181620 cables, are ideal for
fast connections to the 165 input. The shorting link
provided at the input should be connected between LO

and cm for grounded operacian.

IC is preferable,

to minimize rhe pas5ible effects of ground loops

(small mrrents flowing in the ground system), that
there be only one ground point in the measuring
syseem.

If possible, connect all grounds together

at one poinr, ideally ac the CND input terminal of

the 165. 'Tire input ShorrFng link should be removed

for floaLi"g OpcrdLiO".

b. AC VOLTS OwraCion. The Model 165 provide5

five and one-half decades (six ranees, of ac vo1caee

T .

2.

I”WL Resistance. me input reSiSCa”ce of
the 165 on all ac voltage ranges is I megohm 110%
shunted by less rhan 75 picafarads of capacirance.

3. Accuracy. The Model 165 detects the average
value Of a" applied input ac waveform. The display
of the 165 is calibcnted LO indicate the n,,s value
of an applied sinewave.

The accuracy (error Limit)

calculations given in Paragraph Z-ha, ah.0 apply

far ac measurements, except cilai 20 HE and ZOlcHZ,
the specified accuracy is asymmetica1. Reference

the specified ac-volts accuracy ranges a~ 20 Hz,
lkkiz, an* 20w*. Typical aCCUraCy bands at non­specified frequencies ace shown in Figure 6.

5. rlaximum Allowable Input. Ihe maximum contin­uous or i"termifLe"t input voltage which calI be
safely applied 0" manually selected l-volt and lower
ranges is 250 "0lt.S rms. when aperacing manually
on the 10 volt to 500 volt mls ranges or in the
auroranging mode on a11 ranges, the maximum con­cinuous or inrermiCce*t inpur voltage which can
be safely applied is 1200 volts peak ac + dc. on
the 5O&volc rms range (1000 volt range pasitio")
in either ranging mode, the 165 display will flash

when the inpui exceeds 499 volts rms, although a

reading beyond this level is displayed.

2-7. OPERATION AS AN AXXETER. The Xodel 165 can be
used to measure C"rre"L from 21 nanoamp to t2 amps
dc and 100 nanoamps to 2 amps C"S ac.

3. Accuracy.

The dc-current accuracy Of the
165 is t(o.3% of reading + 0.3% Of range). The
error limit of a given measurement can b< Cal­culated using this specifiearia" (see Paragraph
Z-6=3) and the voltage burden (see Paragraph Z;i,l,

OPERXION

diodes Will prorect the sensing resistors from cur­renfs UP to levels which cause excessive heating or
vaporization of pc-board tapes.

1. Measuremenr Procedure. Selecr ehe AC AMPS
function using the FUNCTION switch, set the RANGE
switch. and make input connections to the front-

pane1 cermina1s. The digital display indicates
the decimal point locaeion and engineering units
Of a reading. The polarity Lag” “ill not light

when AC amps is eeleceed.

If the display exceeds
1999 on the 100 milliamp or lower raoges, the three
right-hand digits will blank and ehe overrange "1"

digit will remain lit. See Paragraph 2-?a5 far

details af the maximum allowable Fnpur.

2. Input Resistance. See Paragraph 2-7a2.

3. Accuracy. The aC-C"rre"f accuracy apecifi-

cation of the 165 is used co calculate the error

limit of a Specific mea*ureme"t (see Paragraph

2-6a3). except at 20 Hz and 2OkHz where specified
accuracy is asymmtri~al. Reference the specified
ac-amps accuracy ranges a~ 20 "z, lkI+z, and 2O&.
Typical accuracy bands af non-specified frequencies
are shown in Figure 6, alrhough rhe 10-1000 mA
ran8e has somewhar flatter responsa at 2Ok"z than
char shawn. Voltage burden (see Paragraph 2-7b2)
can also produce error, depending on the level of
rhe source "alcage.

4. Half-dIgit I"terpo1ari.o". see Paragraph 2-74.

5. Marimum Allowable Input. See Paragraph 2-7a5.

2-8.

OPERATION AS AN OHMMETER. The Model 165 can be
used CO measure resistance from 0.1 ohm co 200 meg­ohms. The Model 165 ~ravides se"en full-range decades
of resisrance fram 100 ahms LO 100 megohms. Range
seleccio" can be accomplished either manually x
autamarically.

w selection is accomplished by
setting the RANGE switch S401B LO any ""e of seven
positions, g including the secand position from

full clockwise.

i"his wsicion may be used but it
just duplicates the operarion of the 100 megohm
runs, which is the third position from full clock-

*

NODEt 165

wise. As the RANGE switch is rotated counterclock­wise. the 165 resistance sensitivity is increased.
Automatic selection of range is accomplished by

rotating the RANGE switch to rhe extreme clockwise

position marked AUTO.

a. Measurement Procedure. Select the OHMS func­tion "siw, the FUNCTION switch. set the RANGE switch.
and make input c""necrio"s t" ;he front-pa"el ter-

minals. The digital d$splay indicates decimal 1

location and engineering units of a reading. ':

POlEdry sign "ill not light when ohms is selec:~

If the display exceeds 1999 "n any range, the three
right-band digits will blank and the overrange "1"
*igir Will remain Iit. 1" the AUTO mode or manually
on the oueside IOO-megobm position, a" open-circuit
input ca"~es a flashing 01.7 W display. With an
open in~ue, the inside IN,-megohm range, the third
p"si~ion from full clockwise, may flash or blank de­pending a" whether it was entered from the outside
lOO-megobm renge or the lo-megohm range. Also, if
the RANGE switch is rotated rapidly while in the AUTO
made, the display may blank. Neither candician just
discussed represents a problem or malfunction.

aa shown in Table 2-4. The HI input t&inal 5401 is.

negative with respect to the LO input terminal 3402.
The rermina1 voltage is 100 mulLvolts at full ranz>.

(200 millivolta at maximum overrange reading).

maximum open-circuit voltage is less than 1 volt.

TABLE 2-4.

Ohm Test C”rrenr

Full

Pull-Range

Teat

Range

Terminal VAtaga

Current

100 n 100 In"

1 k0

100 02"

1~0 k"

I"0 rn"

lm.4 ,.

100 "A

10 p.4

100 kn

100 I"" 1 UA

1 I%

100 r&Y 100 "A

10 MO

100 mv 10 "A

100 ML-z

100 mv 1”A

C. *muracY. The accuracy far all abms ranges is

as specified.

This apecificario" applies far envi-

ronmental conditions of 35'C at up to 10% relative

humidify.

Accuracy on the l-megohm and higher ranges

is typically two-times better than specifications.

The error limit of a given mea*urement can be cal­culatcd using the specified accuracies as described

in Paragraph 2-6~~3.

d. Half-digit Interwlation. When the m"st right­hand digit of the 165 display is flashing berwee" two
adjacen; numbers, the percentage of time spent on each

is a half-digit intarpalario" of zhe incoming signal

level.

POT example, 1.000 kilOhmS flashing in near­equal intervals LO 1.001 kilobms would indicate a
reading of 1.0005 kilobma.

e. Maximum Allowable Input. The maximum Yolrage
which can be applied to the input Fn the OHMS func­tion ia 250 va1ts rms on any range. This voltage

may be applied continuously or ineermictenely with-

out damage or degradation af ~pecificati""s.

1073

7,.

MODEL 165

2-9. OPERATION OF THE l-m.4 SOURCE. The ImA front-pane1
pushbutton aCti”*fes * cLIrre*t source of +1 mA *10x.
The current 18 internally injected into the HI input

terminal 5401. voltage compliance is cypica11y *rearer
than 4 vo1r.s.

a. Reeiarance Measurements. If the DC VOLTS func-

tion is selected while usinp. the 1 mA current BOUXCB,
the Model 165 becomes a dir&-reading autora”ginS z
manual ranging ohmmeter having 100% overran&g on ranges

from 10.00 ohs co 1.000 kilohms full-scale (corresponding
respectively co 10.00 millivolr through 1.000 volt dc
***ges).

Useful measurements are available to 4.00
kilohms (corresponding LO 4.00 volts on the 10.00 volt
dc range). I” any c**e. the Yoltage compliance limif

is also the 1iraiL of resistance measurements using

the 1mA C”rre”t source.

Note that rhe engineerI.“*
uni~a on the display will scFll indicate volts, which
is the voltage compliance at which maaauremenrs are
being made.

Af the 8-a time, the displayed numbers
in the reading indicate the value of the resistance
being measured. For example, * reading of 100.0 milli-

volts dc indicates the meaeured resistance is 100.0
ohms and a reading of 1.999 volts dc indicates 1.999
kildlm.

1. Measuremanr Procedure. The ImA current source
feature of rhe Model 165 may be used to measure low
resistances or to check continuity. A” open cir­C”it or resisrsnce grearer aaLl the range limit is
indicated by a display of the full compliance volt­age. This voltage ia eaefly determined by open­cFccuiting in the input terminals of the 165 and

depressing the lmA pushburro” “bile operating in
the DC YOLTS~funcfio” eithsr manvally on the IO­volt range or in the AUTO range mode.

2. Compensaring for Lead Resistance. A precise

value of the ImA current source (I) can be obtained
by open-circuiting the input terminals, eelecting
the DC AMPS function, and depressing rbe ImA push­button; The resistance of the test leads and in-

ternal connections (P& CB” be directly measured

by shorting the teat leads’while in the DC VOLTS

function

and depressing the 1mA pushbucto”. The”
the measured resistance (R) cm be more arrnrately
defermined as follows:

where ” is the observed voltage during the actual
measurement of R.

b. Semiconductor Testi”~. In the DC YOLTS function

and AUTO range mode, the ImA current source may be
used to determine polarity of a semiconductor junc­tion. The forward voltage drop of this juncria” at
lti is displayed a” the Model 165 if Lhe junction is
connecred between the input terminals in the foward
polarity.

Note thaf the lmA c”rre”f *.a”rce is inter-

nally injected into the HI input terminal 5401. I”
the m palartty position, Lhe display will ,.“­dicafe the compliance voltage limit of the current
source> which can be measured as described in Para­graph Z-gal.

1073

OPERATION

DO NOT DEFRESS THE 1mA POS”B”TTON WHEN MTWJAL
VOLTAGE IS APPLIED TO THE INPUT TERMINALS.

Z-10. OPERATIONS SUMMARY.

Condensed operating in-

structions are found on rhe botton cover of the Model

165. They are repeated here with a little more detail.
For complete details of operation. see 2-l Lbrou$h
2-9.

e. Power.

Set Lhe rear-psoel line witches 5302
and S303 to the proper line voltage ~etti”Ss. Check
the fuse F301 for proper rating. Connecr the line
cord CD-7 to 50 or 60 Hz power. Set the power switch
S301 to ON.

b. Co*“aCfio”.9. connacr to the fro”=-pane1 “I

tied) 5401 and LO (black) J402 binding poet Fnput

Cemlinals . Connect the ground link between CND

(sreen) 5403 and LO (black) for grounded operation.

discon”ecting rbe link for floating operation.

Haximum allowed voltage becvaen CND and “I or LO is

l200” peak.

C. Function Selection. Set the outer dial to the

desired function:

DC VOLTS, AC VOLTS, DC ANPS, AC

Ams, or OHMS.

The digital LED display automatically

indicates decimal point, polarity, and-e”$ineering

U”5LS. Lack of polericy on the display on YOLTS or
AMPS functions Fndicatas ac readLngs.

d. Range Selection.

2. Automatic. Set the inner dial to the fully­clockwise position (AUTO). In this position. the
165 automatically “prangea at 2000 digits and _
dawnranges at 179 digirs.

e. lmA current source. If the front-panel In.4

wabbutto” is depressed. arwroximatelv +ImA is in­jected into the i,I input t&minal at ;p to appror-

imarely 4 volts compliance. Set the RANGE switch
co DC VOLTS. For semiconductor tests. forward

voltage at ImA is read direcrly. For continuity or

resisLance measurements, resistance is read in ohms

using millivolt dc ranges in kilohmn using volts dc

ranges (limited to compliance voltage level). With
an open-circuited input actual compliance and current
can be meaaurad on DC VOLTS and DC AMPS respectively.

NOTE

DO NOT DEPRESS THE 1mA P"SHB"TTON WHEN MTERNAl
VOLTAGE IS APPLLm TO THE INPUT TERMINALS.

f. Zero. The DC ZERO potentiometer R431 on the

rear panel may be adjusted for a +O display with the

Fnput shorted on the 10 millivolt dc range or with

B” open input on cbe 1 microamp dc range.

9

T \

3-1.

GENERAL.

The block diagram of the Model 165 is
shown in Scbemaric 25395D. The eiS"*l applied to the
input rerminals first goes rhrough en input switchinS
network and then ie applied to'* dc or ac preamplifier.
A ""ipolar amplifier co""er‘c8 the signal to a positive
dc signal which ie the" applied to *" a-d converter.
The s-d control and display logic ie contained in the
LSI cirx"iZ. snd on the display printed circuit boards.
The numerical information corresponding to the input
signal is displayed a" LED digits. The logic properly
positions the decimal point and indicates engineering
""its.

The inpur swircbitq network is cootrolled from
the logic in the AUTO range mode or from the front
panel manual range switch.

3-2. AC-VOLTS PWLIFIKR..

(see Schprmaric 2539%).

The signal applied *c ebe Fnput tenninela is coupled

through cepaci~or C401 CO a" *c-compensated ae~enuator
consisting of RN403 and C402 through C405. TN* ie
shunted by en input resietence consisting of R401 and

R437, and switchi"* is accomollshed bv meene of PUNC­TION awitch S4Ol.A Deck No. 2: Table i-1 show* the
attenuation end gain factors ee well *a relay aate*

for each *c-volt* range.

TABLE 3-1.

AC Volts:

Gains and Relay St*ce*

RN403

AMP.

;F.ANGE ATTENUATION K401 K402 K403 GAIN Q406 9407 Q40R

lO@lV I:1 ON

OFF OFF xl00 OFF OFF ON

1Oh" 1:1 ON

OFF

OFF

x 10 OFF ON

OFF

1” 1:1 ON

OFF OFF x 1 ON OFF OFF

10

V 100 : 1 OFF ON OFF x 10

OFF

ON OFF

100

" 1000 : 1 OFF OFF

ON x 10 OFF

ow OFF

500

" 1000 : 1 OFF OFF ON x 1ON

OFF OFF

CIRCUIT DESCRIPTIdN

MODEL

SECTION 3.

CIRCUIT DESCRIPTION

a. On the 1 Volt Range.

On the 1 volt range, K401

16 closed, K402 and K403 *re open, end the siSn*l is
applied through resistors R405 end K406 to the input
of s Xl amplifier QA403. The input to this amplifier
is limited to the power supply level* by D419 end

D420.

Overload voltages applied *c

the input are

dissipated in R40S and R406. SwitchinS ie accomplished
throuSh S4OLA Deck No. 6. On the 1 volt range Q406
is on, 9407 and Q4OS *re off. The output is coupled
fo the unipolar amplifier through c422 end swirching
ie accomplished through S401.4 Deck Nos. 7 and 8.

b. On the 100 Millivolt R*n*e. On the 100 milli-

"olL ran8e. the ouLp"t of QA403 is applied co a *LO

amplifier Q.4404. Q407 as on, Q406 and 9408 are off.
therefore the input siS"a1 ie amplified by * facror of
10 before being applied to the unipolar amplifier aSsin
through C422.

C. 0" the 10 Millivolt Range. 0" the 10 mini­volt ran@, a second x 10 amplifier 9.4405 further
amplifies the signal and it 16 applied tbrouSh 4408

co the unipolar amplifier.

d. 0" the 10 Volt Se"*e. On rhe 10 vole **"Se,
K401 *"d K403.are off, K402 is on. Thus, RN403
attenuates the siSn*l by a factor of 100. The eigr
ie then applied to the emplifier chain QA403 and
QA404, "ith Q407 on, selectinS the xlO,S*i" for cb,
chain.

Thus, the signal ia attenuered by 100 and

amplified by 10

for

e "et atreauatio" of a factor

of 10 bafore going to the unipolar smplifier.

e. 0" the 100 Volt Range. 0" the 100 volt **age
K403 is on, K402 and K401 *re off, end the input
signal is attetuated by a factor of 1000 before
being applied to the x10 amplifier chain. Q407
remains on and the *et *cte"u*cio" ie a factor of

100.

f. 0" the 500 Volt P.ewSe. On the 500 Volt range:
K403 remains on, and 9406 is on selectinn the xl
gain for the amplifier chain. Thus, the-net ecte"­uafio" LB a factor of 1000. C402 and C403 *re ad­justed to *c-compensate the *ttenu*tor KN403.

3-3. DC-"OLTS PREAMPLLFISR. (see SCbemaLiC 25392E)
The inpur signal is applied to the sttenuetor RN403
e8ein t,,rooSh ewiccb S4Ol.A Deck No. 2. The outp"t c
the attenustor, e.8 selected by K401 through K403, ie

applied tbroqh S4OlA Deck No. 4 and limiting resie-

tars R420 and R421 to the input of * dc amplifier *L
S401A Deck No. 5, “‘DC INPUT”.

a. DC Amolifier. The dc amplifier consists of a
FET modulator Q4OLA end QLIOlB, protected by D410
through 0413, e" ac empltiier QA403 through QA405
whose bW.n is controlled as in Paregraphs 3-2, e
demodulator 9409, and a final dc ampIFfier coosis­ring of QA406.

The output of this mep1if1er "DC
PREAMP OUTPUT” is fed back to the input by resistanct
elements in RN403, selected by K404 and K405. These
relays select Paine of 1, 10, or 100. Table 3-2
shows the attenuario" gain fsctors ** well a* relay
states for each dc-volts **"Se.

TABLE 3-2

DC volts:

Gains and Relay Stetee

RN403

AMP.

UNGE ATTENIIATION K401 K402 K403 GAIN K404 K40

1hnV

1:1 ON OFF OFF

x100 OFF OFF

1oomv

1:1 ON

OFP OFF

Y 10 ON OFF

1"

1:l ON OFF

OFF

x 1 OFF ON

10 v 100 : 1 OFF

ON OFF

1 10 ON OFP

100 ” 1000 : 1 OFF

OFF

ON

xl0

ON OFF

1000 v 1000 : 1 OFF

OFF ON x 1 OFF ON

b. Modulator and Demodulator. The modulator and
demodulator are operated at e frequency of 220 Kz.
This is developed at the "t44" output of the LSI
chip *"d appears in the middle of Schematic 25392E
"ear the bottom.

S4OU Deck No. 1 disable8 the sig-

nal on ec functions. On dc functions, fwo phase8

10

MODEL 165

are developed by QA601, 9402, and Q4lO. They sre
coupled to the modulator gates by c417 and C418, and
to the demodulator by c409. 0421 an* 0422 clamp the

gate *rives co a reference level equal to the feed-

back "olrsge. developed by QA409, a Xl amplifier

whose input is connected to the feedback point.

c.

Input Zeroing. Input seroing is accomplished

by R431 which determines rhe current throunh R428 and

R429. The voltage ,vzneraced by this c”rr&t across
R428 is added to the feedback “olLaSe developed
across the lo-kilohm element ,,f RN403 between pins
6 and 7. “se a pure copper wire end a dual banana
plug for a shorting plug.

CIRCUIT DESCRIPTION

The reference resistance consists of F.409. and R414
rbrouSh R419. .The specific value of the resistance
is determined by the state of relays K409 through
K415. The rota1 resisfsnce is equal to the full­ran8e resistance. Note that this circuit applies
a ne$sti”e reference currant through the unknown
resi*Lance.

3-5.

le. CURRENT SO”RCE.

bee Schemetic 25392E).
The lmA current is developed by 9404, R411 through
R413 and D405.

It is applied LO the HI renninal by
mean8 of rile fronr pane1 BWitCh S402. R410 ad D406
protect 9404 if S402 is eccidantally depressed while
the voltage is applied to the HI terminal.

d. Input Offset Current. Input offset current is
comwnsated for b” ad,usrinp. R424 “hich develow a
“o&e referenceh to-the f;edback point at the o”t­put of QA409. This voltage generates a compensafing
current through R423 which is applied to the common
node of the FET modulators, Q4OU and Q4OlB.

e. Offset “olra*es.

Offset “oltaSes within the dc
amplifier loop are compensated for by R434 which ap­plies a volrage to the positi”e input terminal of
QA406, the final dc amplifier. The controlling time
constant within the loop is determined by C413 and
R427 in the negative feedback loop of Q.4406.

3-4. OHMS CIRC"ITRY. (sea Schematic 25392E). on a11
ahms ranges, K404 and 9407 are on, firing the dc “alt­age preamplifier at 100 millivolts full range. D416
near QA406 limits the output of this amplifier such
that no more than 1 volt appears at the ioput under
open-circuit conditions. The ohms circuit in the
lower left corner of Schematic 25392E generates a
reference current at the input terminals. This ref­erence c”rre”f is generated by a “oleage at “0 OUT”

G4OU Deck No. 3) divided by a reference resistance

selected by K409 through K415.

8. Reference Voltage.

The reference voltage is
the sunnnacion of 0.1 times the “DC PRW OUTPUT”,
and a fixed lOO-millivolt reference. QA402 performs
this summafion. R462 and R463 provide an output of

0.08 times “DC PW OUTPUT” BL their iunction.
This voltage is applied to rhe positive-input terminal
of QA402 which has a non-in”errinS gain of 1.25 de­termined by R407 and R461. 9405 is on in normal
OperaLion. The lOO-milli”alt reference is developed
from an aftenuaeor scros~ the g-volt reference diode

D408 consisrin~ of R458. R402, and R465. The “olt-

age at R465 is about -1.6 volts. This is amplified
by -0.25 using QA401, and by another -0.25 with QA402.

b. Overload Conditions. Under negati”e overloads,
D418 blocks current flow to 9405 or QA402 output, and
0415 limits the input “oILage at the naSafi”e terminal
of QA402 to the supply “olfaSe. Under positive o”er­loads, D414 limits the neSari”a input of QA402 to the
positive voltage.

This drives the output of QA402
negative until it is limited by D426. AC that level,
the c”rrenf flow in the emitter of Q405 is determined
by voltage across D426, rhe base-emitter drop in 4405,
R454. and R408. These elements limit the collector
current in 9405 LO abo”f 1.2 milliamps. This current
is essentially independent of the voltage appaariwj
at the collector of Q405, which ie determined by the
po~itive voltage at the HI terminal and the voltage

drop of the 1.2 milllamps in the reference resistance.

1073

3-6.

DC-AMPS PREAMPLIFIER. (see Schematic 25392E).
The Fnput c”rre”t passes rbro”Sh S4OlA Deck No. 2
to a reference resistance selected by K406 throush
K411. The voltage across chin reference resistance

is sensed by the dc amplifier in B 4-terminal method
between terminal 1 of RN401 (at circuit LO) and junc­Cio” of K411 end R415, which is applied to the inpur
of the amplifier through S401A Deck No. 4, R420, and
R421. 0” the I-microamp through 1OO-milliamp ranges.
the dc preamplifier is set to a gain of 100, COP

respondinS co a full-range voltage of 10 millivolts.
On these radges, K406 through K411 select the refer­ence resistance which covers s span from 0.1 ohm

(in RN401) through 9 kilohms u(415). On rha IOOO-

mflliamp range, K406 selects the 0.1 ohm resistance

in RN401, and the gain of the dc preamplifier is
changed to 10. correspondinS LO 100 millivolts full
ran$a, as indicated in ParaSraphs 3-3. D401 rhrouSh
D404 protects rhe relays and the sensing resistances
from overcurrent.

3-7. AC-Am3 PRWLHPLIFIRR. (see Schematic 25392E).
As in the case of dc amps. the BC input current is
passed tbraugh S4OU Deck No. 2 to a sensing resis­tance selected by relays. In this cE.se, only re1#ys
K406 thrc.“Sh K409 are used. The output voltage is ,

sensed at S4Ol.A Deck No. 3 and coupled through C401,
S4OU Deck No. 2, and R455 to the AC Preamplifier,
chain. The ac preamplifier is set to a gain of 100
corresponding to IO millivolts full range on the 100
microamp rhrouSh 100 milliamp ranges. a Sain of 10

corresponding to 100 milli”olLs full range on rhe 1000
rsilliamp ac amps range, selected as in Paragraphs 3-2.

As in the case of dc amps, D401 throuSh D404 protect

the relays and sensing resista”ce from a”erc”rreoL.

Note that since the capacitor-couplin8 through C401

OCC”rs I.” the circuit folloving the sensing resis­tances, dc or ac ~“ercurrents .3 A may hsve danaSing

affects on either DC AEIPS or AC AMPS functions.
3-8. “NIPOLAR AMPLIFIER. bee Schematic 25393D).

This circuit, consistinS of QUO2 and QA203. is shown

in the left-half of Schematic 253930. The preampli-

fier output is applied to 3201. an analog outp”t
at the rear panel, and fo X213. R213 and R404 (on
Sehemstie 25392E. near S401A Deck No. 8) attenuate
dc signals to the 0.91-volt level corresponding Co
1 “Ok full range. Note chat the positive terminals
of QA202 and QA203 are essentially at LO. thus the
feedback loops around each op-amp rend LO constrain

the neSsri”e inputs also to the LO level. Since

terminals 3 and 16 of RN.01 are connected to these
ne&ati”e inputs, we may consider the IO-kilobm ele­ments connected co terminal 2 88 a siwle 5-kilOInn

element to LO. The 5 kilohm element from Le”r.i~Ul

11

l .

CE+.XIT DESCRIPTION

1 to 2 of RN201 and this 5 kilohm equivalent element
farm a divider such that rhe volta*e at terminal 2 of
RN201 is half the voltage af. ceminal 1. For positive
si&nals, the o"fpu~ of QA202 will *o negative. DZOl
will be on, Q201 will be off. So if we define

"2.~2 Z the outpur of QA202.
"2

E rhe "olcage SC terminal 2 Of RmOl,

"203 E the ourpur of QAZO,,

"1

z rhe volra*e af terminal 1 of RN201 and

also the preamplifier ourput;

v203 = -2 W202) -2v2

where V202 = -2V2, therefore

"203 - +4v2 -2Y2 - +2v2 - "1

For negative si&nals, the outwt of 98202 will *o
positive. 1,201 will be off. Q201 will be on. In
this case, the voltage at the o"tp"t of QA203 is

-2 times the volCa&e at terminal 2 of RN201. Thus,

From this. the ""ipolar OUtpUt at J202 pravides a
positive signal equal in m*nitude to the value of
the preamplifier output 5201. regardless of sign.
For SC si&nals, Q&.202 acts as a full-wave rectifier,
and QA203 as a filter "sin* C203. The avera*e value
of the ac waveform appears at 5202 as 8 positi"e dc
signal.

Nate that Q201 is off for eosirive signals,
on for negative signals. Thus the "polarity" line
is HI for negative sipnals, LO for positive signals.

This information is passed throu*h ewe tramisfms
of QA201 and R207, and presenred to the logic on the
Fl line on the right side of Schemaric 25393D.

3-9. A-D CONVERTER. (see Schematic 25393D). The
unipo1ar output J202 creates a non-negative current

in the 1-kilohm resistors between terminals 1 and 8

of RN202.

This current is always applied to the ne*­aLive input terminal of i"Le*raLor Q.4204. If the
diode between terminals 1 and 3 of QUO1 is off. this
si*nal currenf. is Lhe only current applied to the
integrator.

If this diode is an, there is also a
reference current at the Lnput node of the integrator.
This reference c"rrent is determined from the -9 volt
reference, the emitter-follower between terminals 6
and 7 of QA201, the 9-kilohm resistance between fer­minds 5 and 3 of RN202. and the setting of R205.
The stare of the diode between terminals 1 to 3 of
QA201 1s de~emined by the state of rhe CS-line
corni"& from the LSI logic. If CS is high, terminal
3 of QA201 will be high, and the diode from terminals
1 to 3 will be off. Figure 7 shows ehe pertinent
logic Fnternal to the LSI chip along with the cir­cufrry shown on Schemaric 253930 for the a-d converter.
Note that LS will change state an rhe next clock pulse

after TH has changed state.

The state of TH is deter-

mined by a zero-crossin* detector QA205 which follows

the intekrator Q&204. For small inputs, the signal
current makes rhe InLegraCor slowly ramp negative, un­til the integrator oucpuc CIOSS~S zero (see Figure 8).
During this time, the reference current is off (CS 1s
HI) .3"d 'TH is 81. When the integrator OUrpUt cr0**e*
zero, 'IH Bees LO, and on the next clock p1use CS Will
alSo go LO. This vi11 turn on the negative reference
current Which Will cause the integrator LO ramp posi­tin? SC a much ‘aster rate (see Figure 9).

12

,

v, - inregrstor output voltage.

VA

- threshold level of threshold detecror.

FIGURE 8. Integrator Characteristics for Small

Input Signals.

If the input si*nal is very small. TH will *o HI im­mediaLely after the reference current is turned on,
and at the next clock pluse, the reference current

will he turned off. For large signals approaching

end scale (2000 counts), when the reference current
is off, the si*nal current will cause the inte*raror
to ramp SC a faster rate in the negative direction

bee Figure 10). when the reference c"IrenZ t"r"S
on after sero crossing and a clock pluse, the dif­ference between the positive signal current and neg­arive reference current will be very emall since the

MODEL 165

v, - i"cegracor 0"Cp"C voltage.
v, -

threshold level of threshold detector.

PICURE 9. lncesrecor Characteristics for

Full-Ran&a lnpuc s*gna1*.

“0

“*.D”

_---- __--

P

2.000CO”NTS

-1

“0

- ince*racor c."CP"C "olca*e.

"d

- Chreshold level of threshold detector.

FIGURE 10. lnCe&raCor Characrerisrics for End-

Scale (2000 Co"ncs) Input Signals.

reference cu==enC is set to be ,ust greater Ghan 2000
co""Cs. Thus. the inCe*=aCo= will slowly r‘amp in the
posiCive direction.

In Chin case, the reference CUT­rent is on most of Che Cime; TH and CS are LO most of
the Cime. Near full range, Che reference current is
on for 1 clock pluse and off for 1 clock pluse.

3-10.

CLOCK. (see SchemaCic 255080). The clack con­sists of QA503, QA602, RSOZ Cbmugh X,505, and C503, at
Che left edge of Schematic 255080. This *ene=aCes a
low-duty-cycle 9.680 Hz clock for Che tSI lo*ic QA501.

3-11. LOGIC. (see Schemaric 25508D). QA501 contains
all logic for the a-d conve=Ce= and auCoran*in* ci=-

cuitry. Ran&e lines Rl, RZ, and R4 a=e conrralled

eiChe= by the a"Ca=an*in* circuitry on QA5Ol o= by
the range swirch S401B Deck No. 10. On manual ran&es,
the MR line is connected CO LO which inhibifs the out-

puts to Rl, R2, and R4 in the LSI cup, The *uncricm

is selected by S4OI.A Deck No. 1. Table 3-3 indicaes
the complete Crurh table for all functions and ran&es
of the Model 165. Q&502 decodes Chis logic into con­trol lines far various relays and analog switches
shown on Schmsti~ 255110. Also see SchemaCic 25392E.

1073

3-12. DISPLAY.

(see Schematic 25394E). Q&501

&e”erates

four m"lCiplexin* lines, T-O CO T-3, and

each is hi&h for an 800 microsecond CLme interval.

Durink T-O the, the funcrion is indicsred by DSlOl

Chrou*h.OS107, and the polarity and most si*nificanC

1 are displayed by LED DN103. During T-l, T-2, and
T-3, DN104, DN105, and DN106 =especCively display
the numericaL digifs with decimal p"inCs.

3-13. POWER SUPPLY. (sea Schemaric 2539X). 5302
end 5303 select the appropriate primary combinations
for the line volCa*es indicated. The outpur of ~301
and C301 is a + 10 volt unre&uleced su,qaly used fo=
the display md for the +6 volt supply QA410 (see

Schematic 25392E). Q&301 &e."erac~s a regulated +5
volt supply.

This powers TTL. LSI, end some analog

circuitry.

9.002 re&ulatos Che ""Cp,,C of D301 and

D302 CO -12 volts.

5301 provides a mes"8 of dis-

connecCin& Che power supplies so ChaC Chey may be

tested independently from the logic and analog ci=­cuicry.

TABLE 3-3.

F"ncLi""lRan.elRela" Decoder Truth Table

Co"tr"l Li"es/Co"crolled Devices

Function Lines

Range Lines %'I/ SW21 SW/ FCC/ SW41 SW5/ SW61 SW71 SW81 SW9/ SWlOl SWlll SW13/ SW14/ SW151

'unctian F4 F2

Fl U"W R4 K2 Kl

K401 K402 K403 Q408 K404 K405 K406 K407 K408 K409 K410 K411 K413

K414 K415

­+ocv 0 0 0 lots" 0 0 0 1 0 0 1 0 0 __ _- -- -- -- -- -- -_ --

-DC" 0 0 1 107s" 0 0 1 1 0 0 0 1 0 __ _- -- -_ _- __ -- __ -_
AC" 0 1 0 lam" 0 1 0 1 0 0 0 1 0 __ -_ _- -_ -- -_ -- __ --

loom" 0 1 I 1 0 8-J 0 1 0 __ __ _- __ __ -_ __ __ -_

1" 10 0 1 0 0 0 0 1 __ __ _- -- - -- -- __ -_

10" 1 0 1 0 1 0 0 1 0 -- _- _- -- - _- -- - --

100 Y 1 1 0 0 0 1 0 1 0 __ __ __ -_ __ -_ _- __ _-

lKv111 0 0 1 0 0 1 -_ -_ __ _- __ -- _- -_ __

ACA 0 1 1 1OOUA 0 0 0 - 0 0 0 10 0 0 0 1 0 0 0 0 0

lOO"A 0 0 1 -- 0 0 1 0 0 o,o 0 1 0 0 0 0 0
100"A 0 1 0 -- 0 0 10 0 0 0 0 1 0 0 0 0 0
1OOllA 0 1 1 -- 0 0 1 0 0 0 0 0 1 0 0 0 0 0

ImA 1 0 0 -- 0 0 10 0 0 0 1 0 0 0 0 0 0

lOmA 1 0 1 -- 0 0 10 0 0 1 0 0 0 0 0 0 0

look4 1 1 0 -- 0 0 10 0 1 0 0 0 0 0 0 0 0

1.4 1 1 1 -- 0 0 0 1 0 1 0 0 0 0 0 0 0 0

+DCA 1 0 0 1LlA 0 0 0 -- 0

0 0

10 0 0 0 0

0

1 0

0

0

-DCA 1 0 1 lll.4 0 0 1 -- 0

0 0

10 0 0 0 0

0 1

0

0

0

lOUA 0 10 -- 0 0 1 0 0 0 0 0 0 1 0 0 0 0

1OO"A 0 1 1 -- 0 0 1 0 0 0 0 0 1 0 0 0 0 0

1mA 10 0 - 0 0 10 0 0 0 1 0 0 0 0 0 0

1omA 1 0 1 -- 0 0 10 0 0 1 0 0 0 0 0 0 0

lOOm.4 1 1 0 -- 0 01 0 0 1 0 0 0 0 0 0 0 0

1A 11 1 - 0 0 0 10 1 0 0 0 0 0 0 0 0

omfs 1 1 0100n000 - 0

0 10

0 0

o-o 10 0

0

0

0

1m 0 0 1 -- 0 0 0 1 0 0 0 0 0 1 0 0 0 0

1oK.n 0 1 0 -- 0 0 0 1 0 0 0 0 0 0 1 0 0 0

1OOKn 0 1 1 - 0 0 0 1 0 0 0

0

0

0

0 1 0 0

M 1 0 0 -- 0 0 0 1 0 0

0 0

0

0

0 0

1

0

1Om I. 0 1 -- 0 0 0 10 0 0 0 0 0 0 0 0 1

lOoK 1 1 0 -- 0 0 0 1 0 0 0

0

0

0

0 0 0 0

1oOm 1 1 1 -- 0 0 0

10

0

0 0

0 0 0

0

0 0

SECTION 4. ACCESSORIES

4-l.

GENERAL. The following Keithley accessories
can be used with the Model 165 co provide additional
convenience and Versatility.

4-3.

MODEL 1651 SO-AMPERE SHUNT. The Model 1651 pic­tured in *igure 11 is an opLiona1 acceesory chat ex­pands the ac and dc current measuring capability of
the 165 from 2 amps to 50 amps. The 1651 is a 4-ter-

minal 0.001 ohm flX shunt that is connected externally

to the 165 input terminals. The 165 is operated in
the ac or dc volts mode manually on the 10 m,.Ui"olc

and 100 millivolt ranges or in the AUTO mode for the
convenience

of

automaric ranging. The voltage drop

y:"'" the 165 inpuf, "sing the 1651 shunt is very

- only 10 mLllivolce at 10 amps. The Model

1651 18 approximately 6 inches long, l-114 inches
deep, and l-3/8 inches high. and may be m&nred t.,
a hard surface using the 15/64-inch diameter mounting
hole an,either end of rhe shunt. A cable is provided
to ~omect the input terminals of the Model 165 to
the inner voltage-sensing terminals of the shunt.
TNa cable is ap,mximaCely 58 inches long. The outer
current-sensing terminals of the shunt should be used
to connect to the c"rrenf source.

FIGURE 11. Model 1651 SO-Ampere Shunt.

4-4.

MODEL 1653 RACK NOUNTINS KIT. The Model 1653
picfured in Figure 12 is a single rack mounting kit
which converts the Model 165 from bench maunt.ing to

standard 3-112 inch x 19 inch reck mounting, with 15
inches (300 mm) depzh behind the front panel.

a. Parts List. see Table 4-1.

TABLE 4-1.

Model 1653 Parts List

1

ItaCk Mo"nfi.ng Panel 2

2532gB

2

Bottom cover Bracket

1 25543B

3

Side Bracket 2

25330B

4 #6-32 x l/4 LG PHIL

PAN km SCREW 2

__

5 1110-32 x 3/g LG PHIL

HD SCFlEW

4

__

/

b. Insrallarion. Rack Mounting Panels and Side
Brackers used in the 1653 are inrerchangeable. Using
the four 1110-32 screws provided, mount one Rack Mount­ing Panel to each Side Bracket as shown in Figure 12.

"sing the two 116-32 screws provided. mount the Boffom

Cover Bracker berween the LWO Side Brackets. Place
the Node1 165 inside the assembled rack kit, spreading
the Side Brackers.co fit around the instrument. The
curved and cusNoned back end of each Side Bracket fits
around and into the rear-panel edges of the 165. The

1073

inside edges of the Rack Mounting Panels fit around
the front-panel ednea of the 165. Now mo"llL the
entire sss&bly of-the 1653 and 165 in a 19-inch.

tidth rack.

I

FIGURE 12.

Model 1653 Single Rack Mounting iat.

15

SECTION 5.

5-1.

GENERAL. This section contains information
necsssary CO maintain the instrument. Included are
procedures for performance verification, calibration,
end troubleshooting.

5-2. REcomENnED TEST Eq"IPmNT. Recommerded test
equipment for verifyin* performance end calibrating
the Model 165 is given in Tables 5-l and 5-8 reepec­tlvely. Teat equipant other than that recommended

may be substituted if the specification,, in the equip-

ment tables are equalled or exceeded. These spscifi­cations are the minimum requireme"ts.

5-3.

PERFORMANCE VERIFICATION. The purpose of this
procedure is CO verify that the instrument is witbin
specifications at the time end environmental condi­tiorls under which tile procedure is executed. If veri­fication is performed at a temperature other than the
calibration temperature of 20 to 30°C, the specified
temperature coefficient (correction factor) multiplied

by the tem9erature difference must be added to the

reading tolerance 88 indicated in Tables 5-2 through
5-7. Relative humidity should be less than 60%. If
it is desired to insure that the Hadel 165 will stay

within specifications for a period of six months, it

is reconmended that the calibration procedure of Para­graphs 5-4 be used.

a. Readinn Tolerance end Interpolation.

(see Tables
5-2 through 5-7). A soecified reading tolerance with
a" intege; number of digits allows a display reading

with a steady indication or a" occasional + and - one
digit.

For example, a K? digit tolerance on a display

reading of 1.000 allows a steady reading of 1.002 (or

0.998) z a 1.002 with 8" occasional display of 1.001

and 1.003 (or 0.998 with a" occasional display of 0.997
and 0.999). A specified reading tolerance with half
digits allows a d-play reading with flashing between
t"o ad,acent digits. For example, a Q.5 digit to1­erance on a display reading of 1.000 sllows a display

chat is flashing between 1.002 a"d 1.003 (or 0.997 and

0.998).
b. Preliminarv Setup.

1. Set the rear panel line switches for the pro­per yawer line (mains) volta*e that is available.
Connect the power cord (CO-7) to the line.

2. Check the fuse on the rear ,,anel for proper
rating:

9D-110,105-125 "AC: 1/4A, SLC-*LO, 3AG, Keithley W-38

195-235.210-250 "AC: l/g& SLC-BLO, 3AG, Keithley N-20

3. Connect the shorting link an the front panel
berween the LO and GM) terminals. For maximum apera­tar safety, make certain that the front end rear
panels and internal chassis shield are connected to

'.

earth *round by way of the third-conductor on the

.:

power cord or by way of a separate clip lead from
the GND terminal'to earth ground.

MAINTENANCE

4. get the front-panel power switch to ON and
allow the Modal 165 to stabilize at ambient tern­perature for at least two hours.

C. Zero Verification. Table 5-2 shows the allow

ccl tolerance of zero oo- all ranges. Manually select
function arid range on the 165 as indicated in the

table.

d. DC Volts Vsrificstion.

(see Table 5-3). The ­DC "oltege Source CA) is used directly for the 1 volt
CO 1000 Volt ranges.

For the 1oOmv and 1Omv ranges,

1 volt

from

the DC Voltage Source (A) is divided by
B ratio of lo:]. and 1OO:l respectively using the Volt.
age Divider (*), For cm"eaieace, it is tecommendad
that the tasts of Table 5-3 be done in the eutorsng­in* mode. They may also be done in tba manual range
mode. Verification should be made far both 90siti"e
and negative iuputs. Table 5-3 indicates the allowed
rending tolerance. equivalent settings, B"d tempera­ture coefficient.

8. AC Volts Verification.

(sea Table 5-4). In

I

this procedure, the AC "olta*e Source (C) is used for:
the 10 millivolt through 500 volts ranges of the 165.#
Required so"rce accuracy is given in Table 5-4.

ZOHS!
"erificatioa is indicated only far the 1 volt range.
This may be done on other ran*es if desired, but it

\

is "ot necessary in that the same circuit components :

are used on all ranges.

Use the autaraa*in* mode (

for convenience or use the manual range mode.

i

f. DC Am!as Verification.

(see Table 5-S): The DC

Current Source (D) is used for the 100 microamp

through 100 milliamp ranges. The 1000 milliamp range
may be verified at the 100 millismp level, since both
the 100 and 1000 milliamp ranges use the same sensing
resistance. For the 1 and 10 microamp ranges, DC
Volta*e Source (A) and DC Current kesietors (E) are
used to develop the appropriate test currents. Set­tings for the DC Voltage Source (A) and the resistsnc
box called DC Current Resistors (E) are. give0 in Tab15
5-5. Bath positive and negative currents should be
verified.

A"toran*in* is sug*ested for convenienca,
except an the 1000 milliamp range where it is neces­ssr‘y to use the manual range mode. The manual mode
my be used on all range tests if desired.

.

g. AC Amps Verificstion.

(sea Table 5-6). It is

not necessary co verify all ac amps ranges at a11

i

frequenciee, since the same sensing resistors are also,
used on dc amps, and the frequency response has been i
already verified in Paragraph S-38. It is suggested ,
that AC Current Resistots

(F)

be 0.1%tolerance metal-:
film resistors. used with AC Voltage Source (C) to
develop the required ac currents. Tba resistors

1

should be located right e,t the front-panel input

t

terminals to the Model 165 so that cable capacity

i

does not contribute to ac current errore. Ideally, i
the lo-kilobm and 1OPkilohm resistance values should
also be shielded. Depending upon the en"ironmant in

which the test is made, this may not be necessary.

16

MODEL 165

The cambinatio" of current ranges and frequencies
given in Table 5-6 is suggested in order to verify
et least one point a" every range, and t" mi"it,ize
extraneoue error8 in the source current due to the
effects mentioned above.

A"torangi"* is *"*geeted

on all except the 1000 milliamp end 100 mill,.amp

rangea. where the msnual range mode must be used.
The manual mode may be used on all range tests if
desired.

h. ohms Verification.

(see Table 5-7). The Resis-

tance Source (0) is used for all ,,hms ranges of the
165 through the lo-megohm range. A discrete 100-m*­ohm resistor, Resistance Source (H) is used for the
loo-megabm r*n*e. On this range, the sensitivity of

the 165 is 1 pA per digit. Ideally, the lOO-megchm

resistor

should be shielded to avoid electrostatic

pickup.

However. it is possible to verify this range

without grounded metal shielding araund the resistor.

if care is used not t" rove anything around in the

vicinity of the 10~me*obm tesistance, creating small

electrostatic c"rre"ts. Again, *"t"r*"gi"g is sug­gested for convenience, although manual ranging may
be used throughout.

i. 1mA Verification. The lmA eurrem source fea­Cure of the Model 165 my be vertiied "sing the fol­1aving procedure:

1. open-circuit the input teminals on the front

panel;

I

MAmTENANCE

2. set the functia" switch co DC AWS;

3. Set the range switch

to

AUTO;

4. depress the ImA pushbutton; the display read-

in* should be between +D.9 and +l.l millimp;

5. eet the function switch t" DC VOLTS;

6. depress

the

ImA pushbutton; the display read-

in* should be bet"ee" +3.80 and +5.00 volts.

j. Voltage Burden Verification es a" Ammeter.

The "olta*e burden for both SC and dc amps may be

verified by using the follotig procedure on DC AMeg

function:

1. connect the DC Current Source (0) to the

input

terminals

of the 165;

2. set the f""ct*o"

switch

co DC AMPS;

3. eet the range switch to AUTO;

4.

CD""ect the

DC Digital Voltmeter (I) to the

Model 165,i"put temi"als in parallel with DC Cur-

rent

source CD);

5. Apply *lo0 millimp dc from the DC Current

source CD).

The DC Digital Voltmeter (I) should

read less than 30 milli"olts.

TABLE 5-l.

Perf"rma"ce VeriflC*tiO" Test Equipment

Ifem Description SpeCific*tiO"

Mfr.

MOdel

A

Voltage Source, DC +0.005x

Fluke

33308

B

Voltage Divider to. 005% ES1

SRlOlO

,~

C

Voltage Source, AC

(AC Cslibrator/Amplifier) see Table 5-4

Hewlett-Packard 745AI746A

D

Current Source. DC to.osX Fluke 3330B

E

current Resistors, DC fO.OlZ General kadio 1433Y

F current Re*i.tors. AC

lk", t O.lZ, 1/4w

lOk0, * O.lZ, 1lSW

look*. t 0.1%. 1/m

__-

mete1 film

0 Resistance source

?O.OlZ

General Padi"

1433Y

H Resista"ce source

1oowi. * l%, 2w

--- ---

I Digital Voltmeter, DC loom" f.S. *t

f(0.U rd* + 0.1x mg)

Keithley

160, 163. or 165

1073

17

t x

MAINTENANCE

TABLE 5-2.

zero "erifxcation

MODEL 161

Input
state FunctLon

165

Rang

Display
Readin*

Reading Temperature
Tolerance

Coefficient

shorted DC Volts

10 In"

100 rn"

1"

10 "

100 "

1 k"

0.00

i2 digits

00.0

fl

,000

+1

0.00

fl

00.0 fl
000 21

to.25 di*it/'C
AO.1
HI.1
*0.1
*o. 1
*0.1

shorted

AC Volts

10 mv 0.00

4 duits kO.1

digit/T

100 rn"

00.0

2.5 *0.1

1" . 000

2 *0.1

10 " 0.00

2 fO.l

100 "

00.0

2 fO.1

500 "

000

2 *0.1

open DC Amps

1 VA

* 000 *3 digits

to.2 digitl'c

10 VA 0.00

t-3 *0.2

100 PA

00.0

f3 i0.2

1mA . 000

33 *0.2

10 mA 0.00

i3 to.2

100 *

00.0

f3 io.2

1 A 000

*3 to.2

w-

AC Amps 100 pA

00.0

4 di*its to.2

digiC/~C

lm.4 . 000

4 20.2

10 mA 0.00

4 20.2

100 DlA

00.0

4 ?0.2

1A 000

4 *o.i

shorted

OhSIS

100 n

00.0

2.5 digits *0.1

dkgiC/'C

lkn . 000

1.5 *0.1

10 M 0.00

1.5 to.1

100 kR

00.0

1.5 to.1

1MR . 000

1.5 *0.1

10 nn 0.00

2 *0.1

100 Ma

00.0

2

to.1

TABLE 5-3.

DC-Volts "er*ficatio"

DC Valta*e "oltage 165

DiSPlSY Rending

source (A)

Divider (8)

Temperature

R8"ge

Reading Tolerance Coefficient

1"
1"
1"

10 "

100 "

1000 "

100:1

10:1

-_

__
__

--

10 rn" 10.00

100 rn"

100.0

1" 1.000

10

" 10.00

100 " 100.0

1000 " 1000

to.35

t3 di*its

di*itj°C

+2

*0.2

12

*0.2
12 to.2
t2

M.2
+3

*c.2

18

1073

T

- ,‘

MODEL 165

Mb.I*ENANCE

TABLE 5-4.

AC-Volts Verification

AC Voltage Source CC) 165 Display

ReQding Teverature

Outwt Frequency Accuracy Fame Readinp Tolerance

Coefficient

10 mv 1kHZ *0.142% 10 !a" 10.00 t7.5 digits i0.2 digit/Y

100 m" 1kHs kO.052 100 mv 100.0 26.5 *0.2

1" 1kHZ to.052 1" 1.000 t6.5

io.2

10 Y lkH7. kO.052 10 Y 10.00 i6.5 io.2
100 v 1kHz *0.052 100 P 100.0 t6.5 to.2
500 " lklil f0.032 500 " 500 *4 io.15

10 rn" 2okHz *0.052X 10 mv 10.00 +7.5 ***it* *o.z di$1L/~C

-18.5

100 In"

2OkHS

?FJ.D52 loo la" 100.0

+6.5 *0.2

-19.5

1 Y

201d(z to.052 1" 1.000 +6.5

f0.2

-19.5

10 Y *Ok& to.052 10 v 10.00 +6.5 *0.2

-19.5

100 " ZOkHZ *o. 052 100 " 100.0 +6.5 to.2

-19.5

500 Y 2okHz f0.032 500 Y 500 +4 to.15

-14.5

1 Y 20 Hz ztO.15% 1" 1.000 +5.5

digit8

fO.2 di@t/'C

-18.5

DCV Source (A) DC Current 165 DisplPy Reading Temperature
DCA Source (p) ReSiStOr. (E) Range ReadiD*

Tolerance Coefficient

10 MO

1 or*

*1.000 *6 digits *0.4 digit/v

1 MO 10 "A tlO.DD *b Lt0.L
+100 II* -- 100 &4 *loo. ,O 16 f0.4
*1 mA

---

1mA t1.000 '6 f0.4

*lo IL4 -- 10 mA flO.OO

f6

20.4
*loo * -- 100 * *100.0 t6 *0.4
so0 m.A

--

1A *100

i3.5

*0.12

TABLE 5-6.

*c-Amps "erific*tio"

AC Voltage Source (12)

0"tP"t Prequency

AC Current

Resistors (F)

tinge

Display
Reading

Reading

Tolerance

Temperscure
Coefficient

10.01" 20 Hz 100 k"

100 "A 100.0 *13 digits

to.4 digit/-C

-29

10.01 1kHZ 10

kG ImA

1.000 *13 to.4

10.01 2okHz 1

lm 10 *

10.00 +13

io.4

-29

10.01

1kHZ 1M 100 r&A 10.0 k4.5 io.22

10.01

1kHZ 1kR 1A 10 *4 fO.2

TABLE 5-7.

ohms

verification

source 165

Display Reading Temperature

Resistances (G&H) Range RWding Tolerance

Coefficient

1073

I

a

5-4. CALIBRIITION.

Recommended test equipment for
calibrating the Model 165 is given in Table 5-8. Test
equipment other than thaL recommended mey be substitu­ted if the specifications io the equipment table are
equalled or exceeded. These specifications are the

minimum requirements.

Calibrared using the following
procedure, the Model 165 Will stay hachin Bpecifica­tions for a period of 6 months for relative humidities
up to 70% at 35’C (see specifications). I” Order to

allow for aging B”d humidicy effects, the reading to1-

ermce given in Tables 5-9 through 5-14 are the same
or less ill** the tolerances given in Secfio” 5-3 Per­farmance Verification.

If in verifying a” inetrument

per section 5-3, it is found that all readings are

WiLbi” the reading tolerances given in Tables 5-9

through 5-14, it is unnecessary to calibrate the in­strument. Calibration should be performed at come
temperature from 20 co 3O’C at a relative humidity of
less cha” 60%.

a. Reading Tolerance and I”tecrx.latio”. (see Tables
5-9 through S-14). A specified reading tolerance with
an infeger number of &its allows a display reading

with a steady indication or an occasional + and - one

digit. For example. a +2 digit r,olerance on a display
readin% of 1.000 allows a steady reading of 1.002 (or

0.998) 0~ a 1.002 with an occasional display of 1.001
and 1.003 (or 0.998 with an occasional display of 0.997
and 0.999). A specified reading rolerance with half

digits allows a display reading with flashing beewee”

two adlacenr digits.

For example, a f2.5 digit tol­erance on a display reading of 1.000 allows a display
that 1s flashing between 1.002 and 1,003 (or 0.99) and

0.998).
b. Preliminary Setup. Calibration should be per-

formed at some temperature from 20 to 3O’C at relative

humidity of less than 60%.

2. Check Ch@ fuse on the rear pane1 for proper

rating:

90-110, 105-125 “AC: Lf4A. SLO-BLO, 3.G. Ketthley

Fu-36

195-235, 210-250 “AC: l/8& SLO-BLO, xc, KeiChley

FO-20

3. Connect the shorting link on the front panel
between the LO B”d GNC rerminals. For maximum
operator safety, make certain chat rhe front and
rear panels and internal chaesis shield are con­nected to earth ground by way of the third-conductor
a” the power card or by way of a separate clip lead
from the GND rerminal to earrh ground.

4. Set the front-panel power ewttch to ON and

allow the Model 165 LO stabllire at ambient tem-

perature for at least two hours.

20

(C) to the HI and LO input terminals of the 165.

Adjust Resistance Source (C) for 10 kilohms and y.

set the 165 LO OHMS function in the AUTO range ’

mode.

t

b). Record the 165 display reading from step i

a).

Cl.

Change the secti”& of Resistance Source :

(Cl to 10 megohms.

,

d) .

Adjust ealibrario” potentiometer R424 (see:
rear panel) so that the 165 display reading is
“ithi” one digit of the reading from step b).

;

4.

Set the 165 to the DC “OLTS function and

manually select the I-voLt range. Remove Ftesis-

tsnce Source (C) and connect Shorting Plug (J)
to the HI and LO input terminals.

f).

Adjust calibration potenriometer R434 (*et

rear panel) BO that the display reading is 0 and
the polarity sign flashes between + and -.

z3).

Hanually select the 10 millivolt range of

the 165.

h).

Ad,ust calibrario” potentiometer R431 (sea
rear panel) so that the display reading is 0 and

the polarity sign flashes between + and -,

1).

Repeat steps 8). through h). until all

display readings are within the required tol­erances .

2. ““ipolar Amplifier and A-D Calloration.
a).

Connect the DC “ol~ege Source (A) to rhe
input of the 165. set the DC “oltege source (A)
output to -0.001 volr, wirh the 165 manually.~set
to the 1 volt range. Adjust c*libraCio” Pot@“­ticmeter RZll (see rear panel) 8” that the 165

display reading is -0.001 volt without flashiw

digits or with flaebtng equally becween -0.000

and -0.002.

b).

AdJust the DC “drag@ source (A) fO suppl:

* -0.011 volt OutpUt.

Record this 165 display
reading. Reverse the O”ql”f polarity of rile DC
Voltage Source (A) and adjust calibration poten-

tiometer R204 (see rear panel) such that the
positive and “e&ati”e inputs provide the same
display reading on the 165,

c). AdjusL the DC “oltage Source (A) to -1.911
Volt* output. AdJust calibration pote”tLome+Ar
RZ05 (se. rear panel) 80 chat the 165 display
reading is within 0.5 digit of rhe input.

d. Zero Calibration Verification. Table 5-9 shows
the allowed tolerance of zer” on all ranges. Manuall:
select function and range 0” the 165 as indica‘ed in
the table.

If zero cannot be verified, repeat Para-

grsphs 5-4Cl.

If zero still cannot be verified,

1073

in the aueoranging mode.

Thy may also be done in the
manual range mode. Verification should be made for
both positi"@ and negati"e inputs. Table 5-10 indica-

tes the allowed readine tolerance, equivalent settiwzs,
and temperature caeffiEient. If dc &alrs cannot be ­verified, repeat Paragraphs 5-4~. If dc volts still
cannot be verified, consult Troubleshooting Section
5-5.

f. DC Amps Calibration Verification. (see Table

5-11).

The DC Current Source (0) is used for the
100 micraamp through 100 millimp ranges. The 1000
millimp range may be verified at the 100 millimp
level. since both the 100 and 1000 milliamp ranges
use the same sensing resistance. For the 1 and 10
micraamp ranges, DC Voltage Source (A) and DC Current
Resistors (E) are used LO develop the appropriate

test currents.

Settings for the DC Voltage Source
(A) and the resistance box called DC Current Resie­fors (E) are given in Table 5-11. Both wsitive and

negative current8 should be verified. Autoranging is

suggested for convenience, except on the 1000 milli­amp range where it is necessary to use the manual
range mode. The manual mode may be used on all range
teets if desired. If dc amps cannot be verified,
consult Troubleshooting Section 5-5.

of the 165 through the lo-megahm range. A discreet
IOO-megohm resistor, Resistance Source 0%) is used for
the 100~megohm range. On this range, the sensitivity

of the 165 Is 1 p.4 per digit. Ideally, the 10'Smegohm

resistor should be shielded to avoid electrostatic pick-

. However, if is possible to verify this range with­E:t grounded metal shielding around the resistor, if
care 18 used not to move anything around in the "ifin­ity of the 100~megohm resistance, creating small elec­trost*tic currents. Again, autoranging is suggested
for convenience, although manual ranging may be used
throughour.

If ohms cannot be verified, repeat Para-

graphs 5-4c.

If ohms still cannot be verified, consult

Troubleshooting Section 5-5.

h. AC Calibration.

2. Set the AC Voltage Source CC) to 100 volts

output at ZOkHs.

Adjust calibration "ariable­capacitor C402 (sse Figure 13 and the bottom co"er
of the 165) so that the 165 displays the same digits
as recorded in step 1. Tolerance on this adjustment
is to.5 digit.

3. Set the AC Voltage Source CC) to 10 volts
ou~pur at ZOkHr and adjust calibration "ariable­capaciror C403 (ewe Figure 13 and the bottom cover

1073

!LU)ITESXKE

ranges at all frequencies, since the same sensing
re8ist.x. *re also used on dc amps. and the fre­quency response has bee" already verified. IL is
suggested chat AC Current Resistors (F) be 0.1::

tolerance metal film resistors, used with AC Volt­age Source CC) to develop the required ac currents.
The resistors should be located right at the front­panel input terminala to the Model 165 so chat
cable capacity does not contribute LD ac current
error*.

Ideally, rbe IO-kilohm and IOO-kiiohm
resistance values should also be shielded. Depending
upon the environment in which the test is nade, cbir

may not be necessary.

The combination Of current
rangee and frequencies given in Table 5-14 is sug­gested in order to verify at least one point on
every range, and to minimize extraneous error-5 in
the source current due LO the effecrs nenrisned
above.

Autoranging is suggested on all except the

1000 millimp and 100 millLamp ranges. where the

manual range made must be used. The manuai oode
may be used 0” all range tests if desired.

21

J .

c403

C402

FIGLiKE 13.

CaUb=ation Adjustments through Bottom cover.

22

c

NODEL 165 MAINTENANCE

TABLE 5-8.

Calibration Test Eouiooent

Item Description

Specification Mfr.

"ode1

A Voltage Source. DC io.0052

Fluke

3330B

8

Voltage Divider *o. 005% ES1 SRlOlO

c Voltage Source, AC

(AC Calibrator/Amplifier) 8ee Table 5-4 Hewlett-Packard 745.4/746#.

D Current Source. DC ~0.05Y Fluke

33308

E current Resistors, DC +0.01x

General Radio

1433Y

F Current Resistors, AC lkn. * 0.12, 1/4w

lOkn, i 0.1x. mw

lOOk& f 0.1%. l/BW

--

mata film

G Resistance Source

~0.01%

General Radio

143x

H Resiacance source lOohio. t 1%. 2w

- -

I Digital Voltmarer, DC

1oOmv f.8. at
t(O.lX rdg + 0.1% mg)

Keithley

160, 163, or 165

.I Shorting Plug use pure copper

solid wire and dual

ban*** plug Keithley K-7

(without copper ehort)

1073

23

c

.:*

MAINTENANCE

MODEL 165

Funccio”

165

Range

Reading Tolerance*

Mill.

Max.

shorted

AC Volts

open DC Amps

open AC Amps

shorred ohms

10 mv

100 mv

1 v

10 Y

100 ”

1 k”

10 Ill”

100 m"

1 Y

10 Y
100 "
500 v

1 Il.4

10 II.4
100 "A

1m.A

10 mA
100 m‘4

1 A

100 II*

ImA

10 mA
100 tn.4

1 A

100 n

lkli

10 !G
100 kc

1MR

10 MO
100 Mrl

0.00 -.00/l

00.0

-.0/l

. 000

-.000/l

0.00

-.00/l

00.0

-.0/l

000

-000/l

0.00

---

00.0

-

,000

--

0.00

-

00.0

--

000

-

. 000

-.001/z

0.00

-.01/z

00.0

-.1/z

.ooo

-.001/2

0.00

-.01/2

00.0

-.1/2

000

-l/2

00.0

--

. 000

-

0.00

--

00.0

--

000

--

00.0

-

. 000

-

0.00

--

00.0

--

.ooo

-

0.00

-

00.0

-

+.00/1
+.0/1
+.000/1
C.OOll
+.0/1
+000/l

+.03/4
+.1/2
+.001/2
+.0112
+.1/2
*1/2

+.001/z
+.01/z
+.1/z
+.001/2
+.01/z
+.1/z
+1/z

+.3/4

+.003/4
+.03/4
+.3/4
+3/4

+.1/z
+. 001
+.01
+.1
+.om
+.01/2

+.1/2

TABLE S-10.

DC-Volts Calibration "erifl.caria"

DC Voltage "Ohage 165

Display Reading Tolerance*

Source (A)

Divider (El) Range

Readfnp. Min.

Max.

1”

100:1 10 mv

10.00 -9.99

*10.01

1V

10:1

100 rn" 100.0

-94.8/9

+100.1/2

I"

-_

1v 1.000

10 "

-_

10" 1"

loo "

-_

I"" "

-“” .

1000 ”

_-

1000 "

-.999

+1.001

--.oo

-9.98/9

+10.01/z

100.0

-99.819

+100.1/z

1000 -998

+1002

*Reading tolerance can be minimum z maximum allowed. not both simultaneously. For example. a reading tolerance
of -0.00/L HFn. fo +0.00/l Max. indicates that the reading tolerance allowed is -0.00 occasionally flashing -0.01

OT +o.oo occasionally flashing +0.01.

24

tlO.O1 "

10 NJ7

1

!JA t1.000

-.996 +1.004

'10.01 "

1MR

10 UA *10.00

-9.96

+10.04

SO0 "A

____

100 ii.4

e100.0 -99.6

+100.4

il mA

____

ImA

t1.000

-.996 Cl.004

f10 I@.

____

10 In.4 flO.OO

-9.96

+10.04

ilO0 IUA

____

100 lx.4

t100.0 -99.6

c100.4

r100 mA

____

1A *loo

-9819 l lOU2

TABLE 5-12.

ohms Calibration Verification

SO”rCe 165 DiSphy

Reading Tolerance*

Resistances (G&H)

Range

Reading Min.

Max.

100 n

100 n 100.0 99.617 100.314

1 k0

I!.3 1.000 ,997 1.003

10 k*

10 kn 10.00 9.97 10.03

100 !a

100 kn 100.0 99.7 100.3

1 MO

1Mn 1.000 .997 1.003

I

100

10 m EN?

100 10 Mn Mll 10.00 100.0 83.011 9.9213 10.07/8 116.9l117.0

TABLE 5-13.

AC-Volts Calibratinn "ertiicatinn

10 nl" 1lrHz

+0.142x 10 rn" 10.00 9.94 10.06

100 rn" lktk

to.052 100 rn" 100.0 99.415 100.5/6

1Y l!dz

*0.052 1" 1.000 .994/5 1.00516

10 " l!dZ

*0.052 10 " 10.00 9.9415 10.0516

100 v lkH7.

io.052 100 " 100.0 99.415 100.5/6

500 v 1kHZ

s.032 500 Y 500 49617 50314

10 mv ZOkHZ

?0.052% 10 mv 10.00 9.82 10.07

100 mv ZO!dh

io.052 100 mv 100.0 98.1 100.516

1v 2OkHZ

*0.052 1" 1.000 ,981 1.005/6

10 Y ZOlcHl

*0.052 10 " 10.00 9.81 10.05/6

100 " 20kHZ

to.052 100 " 100.0 98.1 100.516

500 " ZOkHZ

to.032 500 " 500 486 50314

1" 20 Hz

+o. 15% 1" 1.000 ,982 1.005

*Reading tolerance can be minimum z maximum allowed. tmt bath simultaneously.

For example. a readhg tolerance

of -0.0011 Min. to +0.00/l Max. indicates that the reading tolerance allowed is -0.00 occasionally flashing -0.01

x +o.oo occasionally flashing +0.01.

1073

25

f %

TABLE TABLE 5-14. 5-14.

AC-.4ws Calibration Varificsfion AC-&ups Calibration Varificsfion

AC Voltage Eourca (C) AC

VdtE@

8O”Xa (c) AC currem AC currem

PiWLY PiWLY &&in8 T!dW.%W* &&in8 T!dW.%W*

O"tD"C O"tD"C Pi-.X"e*CY Pi-.X"e*CY R.?IiBLOT‘B (P) R.?IiBLOT‘B (P)

R.¶ttw R.¶ttw

Raading Raading Ian. Ian.

Max. Max.

10.01" 10.01" 20 Hz 20 Hz

100 k" 100 k" 100 II* 100 PA

100.0 100.0 97.7/E 97.7/E

100.7 100.7

10.01 10.01 lkH2 lkH2

10 kn 10 kn ,I&. ImA

1.000 1.000 .986/7 .986/7

1.01314 I.01314

10.01 10.01 zo!az zo!az

I!6 I!6 10 WA 10 WA

10.00 10.00 9.7617 9.7617

10.07/s 10.07/s

10.01 10.01 1kKS 1kKS

lkc lkc 100 mA 100 mA

10.0 10.0 9.6 9.6

10.4 10.4

10.01 10.01 1kHZ udiz

1kIl 1kIl

1A 1A 10 10 6 6

14 14

*Reading eolerance can be minimum x marimm allowed, not b0t.b atiltaneously. FOT ernmpla, a read *Reading eolerance can be minimum x marimm allowed, not b0t.b atiltaneously. FOT ernmpla, a readtng
of -0.00/l xi,,. to +O.OO,l "ax. indicates that the reading eoLarance allowed Ls -0.00 occasioaally of -0.00/l Min. to +O.OO,l "ax. indicates that the reading .ZoLarance allowed Ls -0.00 oc~asioaally
E +o.oo occasionally flashing $01. E +o.oo occasionally flashing $01.

26

MAINTENANCE

MODEL 165

h -I-. I--I I

-T----L--

28

FIGURE 16.

Component Layout, Readour Board, PC-319.

0375

1 . .

LEAD DESIG. TO- 3

I

LEAD DESIG. TO-66 LEAD DESIG. TO-66

I

30

NO. TG-41

KEITHLEY PART NO. IC- 22

KEITHLEY PART NO. IC-2,2~

1073

Q .,

FIGURE 17. PC Board A88embly.

0375

31

T

(9) on lo-1ooov ac

ranges only. 2olrH2
spec is O”L of t&a-­ancei 20 Hz spec is

OK.

(h) only one digit is lit

and at high brightness.

wires near S4OLA Deck
NOS. 2-5 have moved
and/or RN403 is de­feccive.

(1) C402. C403 out of

ad,ustment .

(2) wires near s4olA

Deck NOS. 2-5 have
moved and/or RN403
is defective.

(i) All digits ha”62 iden- Defective aegmenr

tica segments eirher logic.

weakly UC or blank.

U) one digit only has a

Defective display.

weakly lit or blank

segment.

(1) -12v and -6” supplies (1) Shore in -12”

are inoperative; +10.

SUPPlY.
+5. +6” supplies are
OK.

(2) Defective 9.4302.

Cm) +lO, +5. C6V supplies Short in +LO" supply.

are inoperative; -12”
and -6V supplies are
OK.

(3) Replace or clean Deck NO. 2 of s4oL4 or replace dama-

ged relay(s).

See Table 5-16 (c).

Calibrate per section 5-4. R204 and RZll are controlling

adjustments.

(1) Recalibrate per section 5-4.
(2) Paeieian wiree per Figure 14.

(1) Check for 5X duty cycle 9680 k300 Hz waveform at pin

12, 13 of QA602.

If "OC, replace Q.4503 or QA602.

(2) 800 mi.crosec. 252 duty cycle pulses should appear on

T-0 through T-3 multiplexin* lines. Replace q*501,
QAlO4, and/or 9.4103.

Check segment line (A through 0) for TTL level change at
PLOZ, QA106 and QA107, PlOl. Replace apropriace component.

Replace ON103, DN104, DN105, or DUO6 as appropriate.

Check for Shorts in supplies; replace line fuse.

(1) Look for mechanical short and remove. Wick, p,wer turnec
off and 5301 disconnected, check for 3 to 5 kilohms at Pin
D of P301. "se lOOmY f.a. ohmmerer Canocher Model 165) wick,
circuit ‘0 connected to i.n~ue LO of defective 165.

(2) Replace qA302.

Look for mechanical ahmt and remove. With ps.,er turned
off and 5301 disconnected, check for 100 to 200 kilohm ae
Pi" E of P301. "se 1OOm" f.8. ohmmeter (another Model 165)
witI3 circuit LO connected to input LO of defective 165.

32

1073

9 .

i

(‘1) DC ““LX

I (

:b, AC YOLTS

:c) DC AMPS and

AC As5

GrelltCr than 12oov
dc or oeak ac.

(1) Greater than

12OOV dc.

(2) treater than

1200" ac.

Greater rha" 3 amps

rms TIC.

(1) Greater than

2oov rm.¶ ac,
A”T0 range
mode.

(2) creacer than

250" rms or
trigh volta.+/
high frequency
on lower rang­es; manual
range mode.

(la) Q401.

(lb) R420, R421.

(la) c401.
(lb) 0419. 0420

R405. R406.

(la) PC Board tapes

near 0401
through 0404.

(lb) RN401.

(lc) s4olA. oeck

NO. 2.

(la, Q405.
(lb) QA402.
(lc) 0414, 0415.

(la) Check waveform ac a node of 0421 and 0422;

it should not be il squarewave. check for

0ifficulty (a) in Table 5-15.

(lb) Check R420 and R421 for darkening (heat

damage) and/or cracking.

If either is

o?en, there will be no response to an input

signal and high offset on the bottom ranges

(la) Shorred or open.
(lb) Check for response to input.
(1~) Check for claq.Fn~ and leakage.

(2a) Check R409, R414 through R417 for b.1::

tolerance.
(2b) Check operation of K409 through k414.
(2~) Cheek Q405, QA402, 0414. and 0415.

1073

33

P %

REPMCF.ABLE PARTS

MODEL 165

SECTION 6.

REPLACEABLE PARTS

TABLE 6-1.

Abbreviations and Svmbols

Glass enclosed Carbon

Llert7. (cps)

IdlO (103)

milli (m-3)
Mefallized Polyester
micro (lo-fJ)
Metallized Mylar

M~S

(106)

Manufacturer

34

I I

6-5.

c,bxss1s PARTS LIST. (Reference Figure 18).

Table 6-3 Chassis Parts List conrains d comprehensive

switches, and details of rhe fronr and rear panels).

lisriq of every part of the basic mechanical chassis

See Paragraph 6-7 !lechanical parra LISL ior Parts

"ot listed here.

ILam

Part DeScriptFon

QU*lltity

kitthy

Required

Parr NO.

1 TOP COVER 2 ASSEMBLY (with screen shield)

1 255348

spacers, Plastic

5

3

25355h

Spacers, Rubber

5

4

ST-115

5

BOTTON COVER ASSEMBLY (with screen shield)

1

258808

Tilf Bail

1

6

255208

Feet, Plaseic, Black

4

7 Ball, Rubber

243228

4

8

FE-6

Screw, Slotted, Flat "d., 6-32 x 2"

5

__

9 FRONT PANEL (less

overlay)

1

10

253618

REAR PANEL

1

11

253898

Knob.

Range

1

12

Knob, Function

25503~

1

13

25504h

Bushing. Lnsu1aror

1

25399A

TO raw"* PC-318 from Bottom ccwer:

14

Screw, Phillips.

Pan Rd., 6-32 x 5,16" 2

-

TO rsmO"e PC-318 from rear panel:

15

Screw, Phillips, Pan "d., 6-32 x 5/16"

1 __

16

Kc+ Nut, 6-32

1 -

6-6. ELECTRICAL PARTS LIST. Table 6-4 Circuit
Designation Series cancains a list of the basic
three-digit numbers of a series identifying la­cation of electrical (and mechanical) parts to
a ~areicular printed-circuit assembly or assemblies.
Reference is made to the manual pages (re&weable

p*rc* liSC1 that contain all parts of a partfcular

**k-i**.

Followin Table 6-4 is a complete elec­trical parts list for the Model 165. Reference
Table 6-2 to identify the sche,naric(s) pertain­Lng to a particular ~ri,,ced-~Lr~uit assembly num­her.

1073

TABLE 6-4.

circuit Designation series

series

100
200

300
400
500
600

O~SCriptiOtl

Assembly No.

Lo@ Board

PC-313

Readout Board

PC-319
"othm Board PC-318
Mother Board PC-318
Mother Board

PC-318
Mother Board PC-318
Mother Board PC-318

1

35

-i .

REPLACEABLE PARTS

x

I

----

36

.

FIG"RE 18.

Chassis Assembly - Exploded Yiew.

MODEL 165

RF.mACEABLE PARTS

REAOO"T & WCIC CIRC"ITRY

"100" SERIES

MISCELlANEO"S

Circuit Mfr. Mfr.

Kelthley

LIesip,. Description

Code

0e*ig. mrt NO.

Of?.

JlOl conwccor, 12 pins

02660

6-380949-Z

cs-263

i

JlO2 connector, 10 pins

02660

6-380949-O

cs-264

2

5103 connector, 10 pins . .

02660

6-380949-O

cs-264

2

PlOl Connector Pin, PC Board.

80164

--____

2424%

29

PI02 Cmnector Pin.

02660

1-380953-O cs-265

20

PI03 Con"ector Pi".

02660

1-380953-O cs-265

20

CAPACITOR

Circuit Mfr. nrr. Keirhley

oesia.

oescription Code Oeri~

Part so.

qry.

Cl01

100 &IF, ,10x, 15v, ETT 06751

TSD515107A c205-lOO'(

I

DIODES

C‘rcu‘t Mfr. nrr. Keichley
DSSi$. oescr‘ptio"

Code Denis. Part NC3 c i'

DlOl

Rectifier. . . . . . . . . . . . . . .

01295 1N645 RF-14 17

0102

Fwctifis-. . . . . . . . . . . . .

0,295

1N645

RF-,4 17

0103

Rectifier. . . . . . . . . . . . . . . . . . . .

01295 IN645 RF-14 17

0104

Rectifier. . . . . . . . . . . . . . . .

01295 lN645 RF-14 17

0105

RecLifi.er. . . . . . . . . . . . . .

01295 IN645 RF-14 17

0106

Rectifier. . . . . . . . . . . . . . . . . . . . .

01295

IN645

RF-14 . 17

0107

Rectifier. . . . . . . . . + . . . . . . .

01295 IN645 w-14

17

DIODE NETVORK

Cir‘C”it

Mfr. Mfr. Keithley

DSSiS:.

O~SCriptiOll

Code

Oesig.

Part NO.

qiy.

ON101

Diode Network, 14-pin DIP. . . . .

0726-S

FSA2620M

m-1

2

DNlOZ

Diode Network, 14-pin DIP. . , . . .

07263

FSA2620"

ON-l

2

ON103

Digital Display, PolarltylOverrsnge, 14-pin DIP.

H-P

HP5082-7732

DD-11*

1

DN104

Digital Display. 14-pin DIP, 7-segment . . . . . H-P HP5082-7730

DD-v* 3

ON105 Digital Display, 14.pin DIP, 7-segment . . . . . H-P

HP5082-7730 Do-v*

3

oNlO

Digital Display, 14-pin DIP, 7-segmenC . . .

H-P

"~5082-7730 DD-v*

3

*Selected for Light Intensity, Codes “C”, “I,“, or “E”.

H-P = Hewlett-Packard

0375

37

s

READOUT & LOGIC CIRC”ITRY

“100” SERIES (cont’d)

circuit

Mfr.

Mfr.

Keithlay

rlssizq.

Description

Code

Desig.

Part NO.

qty.

OS101 Pilot Lamp, 6.3V, T-1-3,4. . 05464

7381~AS25

PI.-59 7

OS102 Pilot Lamp, 6.3", T-1-3,4. . 05464

7381~AS25

m-59

7

OS103 Pilot Lamp, 6.3V, T-1-3,4. . 05464

7381-AS25

x-59

7

DSLO4 Pilot Lamp, 6.3V, T-1-3,4. . . 05464

7381~AS25 a-59

7

OS 105 Pilot Lamp, 6.3". T-1-3,4. , . 05464

73814525

x-59

7

DS106

Pilot ‘amp, 6.3", T-1-314. . 05464

7381-AS25

m-59

7

DSlO7 Pilot ‘amp, 6.3", T-1-3,4. . 05464

73814525

m-59

7

INTEGRATED CIRCUITS

CirC”it

Mfr. Mfr.

Keiehley

msig.

DeSCfipttOn

Code Dais. Part NO.

qty.

9ALOL Transistor Array, 14-pin DIP . . . . . . . . . .

07263 FPQ3724

IC-63

I

$4102 Transistor Array, 14-pin DIP . . . I . .

07263 PPQ3461

IC-57

2

QA103

Transistor Arr*y, 14-p‘" DIP . . 07263

FPq3467

IC-57

2

QA104 Hex Inverter, 14-pin DIP . . . . . . .

01295 SN7406

IC-62

3

QA105 Hex Inverrer. *4-pin DIP . . . . .

01295

SN7406 K-62 3

QA106 Quad NAND. 14-pin DIP. . . .

04713

"C858P

K-22 1

QA107

Hex 1nverter, 14-pin DIP . . . . . 01295

SN7406

K-62

3

CiK”iC

Mfr. Mfr.

Keithley Keithley

oesig:.

oescriptio" Code

DSSi&.

Part NO. Part NO.

.9rv. .9rv.

RlOl

18 n.x.3w.w .................

44655

4400-1m

30-1m

RVZ-18 RVZ-18 i i

RIO2

Not Used ............

: :

............................

_-

RL03

680!?, LO%., L/f&l, Camp. ................

01121

CB-331-10% R76-680 7

RL04

6803, LO%, 1/4W, Camp. ................

0,121 CB-331s10% R76-680 7

RI05 6800, Lo%, 1/4w, camp. ................

01121

m-331-10% R76-680

7

RlO6

6800, 10%. 1/4W, Camp. . . . . . . .

0,121

CB-33L-10% R76-680

R107

6800, lO%, 1/4w, camp.

01121

CB-331-10% R76-680

:

RL08

man, 10%. 1/4w. Camp. . 01121

CB-331-10% R76-680

7

RLOV

68011, LO%, 1/4W, Camp.

Oll2l CB-331-10%

R76-680

7

RllO

lk0, 10%. 1/4w. COW . . . . 01121 CB-561-10% R76-Ik

1

RESISTOR NETUIORXS

Circuit

Mfr. Mfr. Keithlay

DesiR.

Description

Code Oesig.

Part NO.

qtv.

RNlOl

Thick Film Resistor Network. . , . . . . . . . . . . . 80164

-_----

m-11

1

RN102

NotUsed.............. . . . . .

----- _-__._

- -_-- _-. ...,

RN103

Thick Film Resistor Network. . . . . . . . . . . 80164

--__-_

m-9

1

38

0375

i

T .f

73138 89P- 1KO

RP89-lK

1

01121 CB-124-10%

R76-L2OK

2

01121 CB-124-10%

R76-12OK

2

73138 89P-5000

RP89-500

1

73138 89P-2KO RP89-2K

1

OllZl

CB-154s10%

R76-150K

1

01121

CB-103-10% R76-10K

6

Oll2l

CB-103-10% 876-1OK

6

R209

nm, Lo%, L/4W, camp. ................. 01121 G&105-10% R76-1M

R210

Not Used.

.......................................................

..'.

Fall

lOK0,

0.75w,

carmet ..................

73138

89P-10KR RP89-LOK

4

R212

2.8Kfl, l%, l/&r, MLF.

.................

07716

CEA-TO-Z.mn

R88-2.8K

1

R213

6.04KR, 0.1%. l/&I, MtF

................

91637 MFF-l/8-6.04K

R176-6.04K

1

POWER SUPPLY CIRCUITRY

“300” SERIES

circuit
Desig.

P301
P302
P303

3301

5301
S302
5303

F301

. . . .

QA301
Qh302

?,ISCEL~WEO”S

Elf*. Mr.

oescripeion

Code oesip,.

connector Pill, PC Board .

80164

war Used. .

connector Pin, PC kJa*d

80164

Jumper connector ASSemblY . . .

80164

Switch, Power Toggle. 95146 "ST205N
Switch, Slide, D.P.D.T.

.

79727

GG35OPCDPDT

S.,liLCh, Slide, D.P.O.T.

79727

GC350PCDPDT
Transformer . . 80164
Fuse. Sh-*lo 1/4A. 117". . . 75915 313.250s

Fuse, Slo-610 l/&4. 234". . . . . . 71400 MDL

IntegraLed circuit, Voltage Regulator,

w,

case m-3.

12040 LM309K

Integrated circuit, Voltage Regulator, 12”, case TO-220 0,263

UC”7812393

CAPACITORS

CilZC”iC

Mfr.

Mfr.

^. _.

n-34
K-60

c301

2000~F, 15", FAL. . . .

C302

200 !JF, 35", EAL.

c303

100 pF,

15”,

EM..

c304

100 g,

15”,

FAL. .

c305

0.33uF,

50”,

CerF . . .

C306

0.1 pF. 16”. cero .

c307

0.1 @, 16”, cero

C308

0.33”F, 50", cerr .

.........

29309

JCN2000158P

.........

90201 mwOON35PDN

.........

29309

JC6100158P

.........

29309

iC6100158P

............

72982 8131050651-344M

............

71590 "K16-104

............

71590 "K16-104

............

72982

8131050651-334H

DIODES

circuie

Mfr. nfr.

Des‘R.

OescriDLion

Cc& oesig.

0301

Rectifier . . . . . . . . . . . . 01295

IN645

0302

ReCLifier . . . . . 01295

IN645

0303

Recrifier, Four-diode bridge. . . . . . . 83701

PO-10

1073

29
29

1
1

2

1

I

1
1

1

Ljry.

c210-100x

2

c*37-,339

6

C238-.L'!

2

C238-.LY

2

C237-.33X

6

C401
C402
C403

80164

...... 25537A

1

80164

......

2553%

1

80164

......

25538‘4

1

80164

...... SW-354 1

80164

......

SW-223 1

CAPACITORS

I

I

Mfr. Mfr. Keithley

Code Jlesig. Part No.

qty.

-

O.O68uF, 1200"

............

......

.8-8.5pF, 750", class.

........

......

l.O-3OpF. 750", class.

........

......

6800PF, 1%. 100". Mica

........

......

97419

MZWX-.068M

72982

562-013
72982 568-013
14655

CD19FA68*F03

14655
97419

14752
14752

015FC641P03

MZWR-.0022M

625BlC-153
625BlC-222

CMI-.06&l
C232-.8-8.5P
C232-1.0-3OP
C248-68OOP

C249-6OP
C181-.OLM
C221-.015"
C221-.0022M

56289

loss-510 C22-.OLM 6

17554

TSD210 cml-12OM 1

71590

m-330-10x C64-33P 2

29309 JC650158N C241-50M 1
72982 8131050651334M C237-.33M

71590

TCZ-3R3 c77-3.3P

71590

TCZ-3R3

C77-3.3P

72982 *0100ck5F0102K C64-.OOlM

56289

loss-S2O

56289

loss-s20

17554

TSD120125

72982 8131050651105M

CISZ-.O22M
C152-,022f.f

1

c179-1.2M
c237-In

56289 loss-$10 C22-.olM
17554

To4015336-10 CZZB-33M

72982 81210506X-104M

C237-1M

72982 8131050651-105M C237-.1M

72982
71590
56289
56289

80164

813105065133411
DD331-10%
loss-910
lOSS-?I10

_-

C237-.33M

C64-33OP
C25G.M
C258-.LM
C73-.0047M

C404
C405

C406
C407
C408

60PF, 300", Mica

...................

0.01llF. 1200".

....................

O.O15PF, 200", MPCb.

.................

O.O022"F, 2OOY, MPCh

.................

C409
C410
C411
C412

C413
C414
C415
C416

O.OlYF, 1000”. cero.

.........

120°F. lo", ETT.

...........

33PF, 1000", cero.

..........

50°F. 15", FAL

.............

0.33"F, 50'1, CerF.

..........

3.3pF, 600". CerT.

..........

3.3pF, 600". CerT.

..........

.OOluF, 1000". CerD.

.........

C417

C418

C419

C420

0.022UF. 1ooov. cerrl . . .

O.O22PF, 1000". cero . .

l.ZUF, 20", WC. . . .

l.O"F, 50". CerF .

C421

O.OllJF, lOOOY, cero. . .

C422

33°F. 15". Epoxy . . . .

C423

l.O,,F, 50". CerF . . . ,

C424

O.l"F. 50". CerF . . . .

C425
C426
C427
C42R
c429

0.33!JF, 50", ces. . .
330PF, 1000". ceto . .
O.lvF, lOOO", CWD . . .
O.liF, lOOO", cero . .

0.0047 F, 4OO", 20%. Mylar

.......

.......

.......

.......

......

......

......

......

. . .
. .
. .

. . . .

. .

. . . . .

. .

. . .

. .

. . . . .

. .

. . . . .

1073

'i .-I

42

D401

Rectifier 3A, 200". . . .

0402 Reciifier 3.4, 200". . . .

0403 Rectifier 3A, 200". . .
D404

Rectifier ,A, 200". . . .

D405
D406
D407
D408

Rectifier, 75 mA, 75v

Zener, 6". 4OOmW. . . . .

NOf Used. . . . . . .

zener, 9" . . . . . .

D409
0410
D411
0412

D413
0414
D415
D416

D417
0418
0419
D420

0421
D422
D423
0424

D425
0426

. . .
. . .

. . .
. . .

. . .
. . .
. . .

. . .
. . .
. .

. . .

. .
. .
. .
.

. . .

. .
. . .
. . .

. . .
. . .

.......

.......

.......

.......

. . . . . .

. . . . . . .

. . . , . . .

. . . * . . .

. * . . . . .

. . . . . . .

. . . . . . .

.......

.......

.......

.......

.......

..... : .

.......

.......

. . . 9 . . .

. . . . . . .

. . . . . . .

* . . * . . .

.......

. . . . .

. . . . . .

. .

.......

06751 lN703A DZ-42

04713

"R1032B
04713 MK1032B
04713

E(R1032B

04713

km10328

RF-40
RF-40
RF-40
w-40

01295 IN914
12954

DZ701104A

. . . . . . . . . . .

06751

18937

RF-28
DZ-47

. . . . . . .

DZ-41

. . . . .

. . . . . .

12954

lN715
12954 lN715
01295

1133595

. . . . . .

DZ-22
m-22
RF-43

01295

lN3595 RF-43
01295

lN914 RF-28
01295 IN914 RF-28
12954 DZ701104A DZ-47

. . . . . . . . . . . . . . . .

04713

lN4006 RF-38

07263

lN3595

w-43

07263

lN3595

RF-43

01295

IN914
01295

lN914
01295

IN914

..*.. . . . . . .

RF-28
RF-28
RF-28 .

. . . .

4
4
4
4

*
2

. . . .

1

. . . .

2
2

4
4

8
8
2

. .
1
4
4

8
8
8

. . . .

. .
2

Ci*C”it Mfr.

Nf*.

Des<8

Description Code

DSie..

Part NO.

otv.

K401

Single-Pole, N.O.

.................. 70309

RI.-41

1

K402

Single-Pole, N.O.

.................. 70309 a-39

4

K403

Single-Pole, N.0

.................... 70309 RI.-39

4

K404

Single-Pole, N.O.

..................

95073 375-670

FL-40

K405 Single-Pale, N.O.

..................

95073 375-670 u-40

K406

Single-Pole, N.O. . . . . ....... 70309 m-39

K407 Single-Pole, N.O. . . . ....... 70390 m-39

K408 Single-Pole, N.O. . . .......

95073 375-670

m-40

K409 Single-Pole, N.O. . . . . ....... 95073

375-670

RI.-40

K410

Single-Pole, N.O. . . ....... 95073

375-670

RL-40

K411

Single-Pale, N.O. . .
K412 NOf Used. .
K413

Single-Pole, N.O. .

K414 Single-Pole, N.O. . . . .

K415 Single-Pole. N.O. . .

. .
. .

.

.......

95073 375-670

RL-40

9

...........................

.......

95073

375-670

RL-40

9

.......

95073

375-670

XL-40

9

....... 95073

375-670

Pa-40

9

0177 43

+ .

REPLACEABLE PARTS

HODEL 165

SWITCHING 6 AC/DC PREAMP CIRCUITRY

"400" SERIES (cont'd)

TRANSISTORS

Q401 P-Channel MOSFET (Dual) . . . . . . . . . . . . . .

72699 955-004 TG-94 1

Q402

PNP, Case TO-106. . . . . . . . . . . . . . . .

07263 285910 TG-13.1

2

Q403

Not Used. . . . . . . . . . . . . . . . . . . . * . . . . . . . . . . . .

. . . . . . .

. . . .

Q404 PNP, Case TO-106. . . . . . . . . . . . . . . . 07263 285139

X-66

1

Q405

NPN, Case

2N3439

K-93 1

Q‘06

P-Channel FET, Case TO-72 . . . . . . . . . . . . . .

72699 575-011 x-95 4

Q407 P-Channel FET. Case TO-72 . . . . . . . . . . . .

72699 575-011 TC-95 4

Q408 P-Channel FET, Case TO-72 . . . . . . . . . . . .

72699 575-011 TG-95

4

9409 P-Channel FET, Case TO-72 . . . . . . . . . . . .

72699

575-011 TG-95

4

9410

PNP, Case TO-106. . . . . . . . . . . . . . . . . . .

07263 2N5910 TG-111

2

QA401

Operational Amplifier, 8-pin DIP. .......... 12040

LM307N X-61

QA402 OFerarianal Amplifier. B-pin DIP. ..........

07263

Special X-76

t

QA403 Operational Amplifier, [i-pin, Case TO-99.

......

12040

LM31OH K-18

2

QA404 Amplifier, B-pin DIP. ................

12040 IJ4301AN X-24

QA405 Amplifier, 8-p1n DIP. ................

12040 LM3OLW

x-7.4

:

QA606 operational hlplifier, B-pin DIP. ..........

07263 Special

XC-76

6

9.4‘07

Not Used.

..........................................

Q.4408

NOL Used.

..........................................

QA409 Operational Amplifier. a-pin, case TO-99.

......

12040 u431011

X-18 2

QA410

Voltage regulator, 6". Cast 'TO-220. .........

07263 UGH7806393 K-64

i

RESISTORS

R601

56OKR. 5X, 1/2W, Camp

R402

SKJl, 0.75W, cermet. . .

R403

IMn, l%, 1/2w, DCb. . .

R404

6410, 0.1%. l/W. . . .

R405

12.5Kn. 51, 3W, VW. . .

R406
R407
R408
fl409*
R410

R411
Ml2

R413
R414
R415

44

12.5w1, 5X, 3W. Ww. . .

30.1m, 0.1x, 3W, WW. .
lrn, 1x, l/&J, MCF. . .

99.5n. 0.14, 1/8W . . .

1.2Krl, 10%. 2w. Camp.

lli?, 1%. 1/8W, MS. .
lrn, 1%. mw. NtP.

3.OlKn, 1%. 1/8W, MTF

9002, 0.1%. 1/8W. . . .

9Kn. O.l%, 1/2W, MU. ,

*Nominal value

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

. . .

. . .

. .
. .
. . .

. . .
.
. . .
. .
. .

. . . .

. . . .

. * * .
. . .

. . . .

. . . .

. . . .

. . . .

. . . .

. . .
. . .

. .

. . . .

. . . .

. . . .

. .

. . .

I * .

. . .

. . .

. .

. . .

. . .

. . .

. .

. . .
. . .
. . .
. . .
. . .

01121 EB-56OKfi

R19-560K

73138 89P-5m RP89-5K

91637 DCF-l/2-lMn

RlZ-1M
91637 MMF-1/8-441n R176-441
15909 DAS3-12.5KR R208-12.5x

15909 DAS3-12.5KR R208-12.5K
15909 DAS3-30.1KR R207-30.X
07716 CEA-TO-1K.G

R&9-1K
91637 Mm-l/8-98.7ri R176-99.5
01121 HB-1.2m

P+l.ZK

07716 CEA-TO-1w R88-1K

07716 CEA-TO-1KR

R88-1K

07716 CEA-TO-U5

Pm-3.0x

91637

NMF-ll8-9oon

R176-900

91637 KFF-l/2-9KS

R205-9K

2
1

2
1

0375

f b

iI

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

..........

4&18OK?i
E&330!%
CBTYZ-108
89P-1OKn
CM-TO-825

CB-471-m):
CBTYZ-108
CB-101-10%
cw-1ooy*1
CB-39s10%

89P-1OKn
CB-106-10):
CEA-l.oKI1
89%1OKG
CB-47*-10%

m-47*-10%

EB-560KZ
CEA-6.8us
CB-225-102
CB-22s10%

CB-*72-iox
CB-103-10%
CL%-ll.0
CB-102-10):
MIT-1,8-9W

circuit

Mfr.

Mfr.

Keithley

Des&.

Description Code Desi,e,.

Part NO. qty.

R461 120.4m, 0.1%, l,SW. ................ 91637

me-l/8-120.4Kn R176-120.4K 1

R462 3oo.*m, 0.1%. 1/8W. ................ 91637 w-1/8-3oo.zcG R176-300.2K

1

R463 Zb.lKL?, 0.1%. l/W ................. 91637 MMF-l/8-26.1W RI,&26.1K

1

R464 3O.M?, 1x, 1/8W, MC. ............... 91637 MFF-l/8-3O.lW1 RZ06-30.N

1

R465 l.bZK.0, 1%. 1/8W. MU. ............... 91637 MFF-l/8-1.62KQ R206-1.6X

1

R466

lOw2. 10%. 1/4w, camp. ............... 01121 CL+103-101: R76-10K

6

R467 4.7Ki2, 10%. l/4!?, camp ............... OllZl CB-472-10X R76-4.7R

6

R468 b.wHr!, 1x, l/&l, Mm. ............... 07716

CEA-6.98m R88-6.98K

2

R469 4.99wi, I%, lftw, HtF. ............... 07716 cF.A-4.99KQ Km-4.99K

1

R470

lrn, 1x, l/N, MLF ................. 07716 CEA-1KR R88-1K

5

R471

R472

R473
R474
R475
R476

07716 CEA-lp-,, I@*-1K
07716 CEA-1w It**-llK
01121 CB-105-10X

R76-1M

01121 CB-10s10%

R76-10K

07716

CEA-4.ozm *88-4.0*X

07716 CEA-*KD X88-2K

RESISTOR NETWORKS

CirC”it Mfr.

Mfr. Keirhley

Desig.

DesCriDtio” Code

llesig. *art NO. QLY.

RN401 Thick Film Resietors . . . . . . . .

80164 . . . . . . . . . . .

R202

1

RN402 Notused...................... . . . . . . . ...‘..... . . . . . . .

RN403 Thick Fall Resistors . . . . . . . . .

80164 ..,........ TF-II 1

46

1073

T

.

CSOl

Not USed

...............................................

c502

NOC USed

...............................................

C503

O.OluF, 22, ZOO", >,ylar.

...............

14752 *1oBlc103-*%

c*47-.01?!

1

c504 O.OluF, lOOO", CerD.

................. 56289 loss-SlO c**-.01.Y

b

c505

Not USed

...............................................

C506

0.33-F, lOOO", cem.

.................

56289 lOSS-510 c*37-. 1%

6

C507

0.3,uF. 1000", tea.

.................

56289

loss-s10

c23:-.33!,

6

C508

470 pF, lOOO", cerrl.

.................

71590

m-471 C64-4iOP

1

circuit Mfr. ?(fr. Kefthley
&sip. Description Code tIesif.. Part !:'I. it".

@A501

Large Scale IC . . . . .

80164 LSI-2 LSI-2

1

QA502

Large Scale IC . . . . . . . . . .

80164 LSi-3 LSI-3

1

QA503

Timing Logic. &pill DIP. . . .

12954

1N709 IC-71

1

RESISTORS

circuit Mfr. Mr.
Lksig.

Description

Code Desig.

8501

2.2KO. 10%, 1,4 w, camp.

............... 01121 CB-***-10%

8502

12.7~1, 1%. l/8 W, MtF

................ 07716 CL-12.7KO

R503 lKrl,

1%. l/.3 w, MCF

.................

07716

CEA-1K

R504

4.7Kr2. 10%. l/4 w, camp.

............... OllZl CB-472-10%

R505

4.7Kr2, 104, l/4 w, camp.

............... OllZl CB-472-10):

R506

1K n, 10%. l/4 w, camp

................ 01121 CB-lo*-10%

FL507

Not Used ...................................

R508

47K.Q. 10%. l/4 W, camp

................ 01121 CB-473-102

Keithley
Parc so. . Qt”.

Rib-Z.?K

1

R88-12.7K

1

R88-lK

1

R76-4.7K

6

R76-4.7K

6

R76-1K

5

R76-47K

1

0177

.

47

7 .

ChPACITORS

clrcuic

Mfr. \Ifr.

Keirhley

Lksig. Description Code Desig.

Parr NO.

QC”.

C601 470 PF, 1000 v, CerD . 71590 m-471

C66-47OP

3

C602 470 PF, 1000 ", CerD . . . . . . . 71590 m-471

C64-47"P

3

'2603 O.OluF, moo 'I, cer* . 56289

mss-SIO

c**-.01‘1 6

C604 O.Ol>F, 1000 v, cem . .

56289

loss-810

c**-.01x

6

C605 O.OluF, moo v, cerl3 . . . . 56289

loss-s10 c**-.om

6

DIODES

Circuit mr. er.

Keirhley

Desb?. Description CO& oesig.

Part No. ijtv.

0601 Rectifier. . I . . , 01295 1N645 RF- 14

17

0602 Rectifier. . . . . , 01295 lN645

RF-14

17

0603

Rectifier. . . . . . . . . 01295 IN645

RF-14

17

0604 Rectifier. . . . . . . 01295 lN645 RF-14

17

0605 Rectifier. . . . . . . . . . 01295

lN645

RF-14

17

0606

Rectifier. . . . . . . 01295 lN645 RF-14

17

0607

Rectifier. . . . . . . . . . . . . . 01295 IN645 RF-14

17

Db08

Rectifier. . . . . . . . . . . .

01295

IN645 RF-14

17

DIODE NETWORK

Circuit HfT. Mfr.

Keithley

ksir;.

D~SC~iptiO" Code Desig. Part NO.

Qty.

DN6Ol

7-diodes, 14-pin DIP . . . . . . . . . . . ‘ 0726, FSA2620M

DN-l

1

I

Transistors

CilT"iC

Mfr. Mfr. Keithley

Desis. oescrip~io*

CO& Part NO.

I

oesin.

OC".

9601

PNP, Case K-92. . . . . . . . . . . 0471, *mm37 W-61 3

4602

PNP, Case TO-42. . . . . . . I . . 04713 ZN5087 TG-61

3

INTEGRATED CIRC"ITS

Circuit

Mfr.

Mfr.

Keithl‘Zy

Desig.

ikscripcion CO&?

Desiq. Part- NO. my.

QA601

Hex inverter, 14-pin DIP.. . . . . . . . . .

01295

SW406

K-62

3

9A602

Hex inverter. 14-pin DIP . .

01295 SN7406 IC-62

,

WO,

Hex invercer. 14-pin DIP . . , . . . . .

01295

SW406 IC-62

3

RESISTORS

R601

Not USed

...........................................

~602

22w, IO%, 1/4w. camp.

................ 01121 CB-223-10%

R7b-**K

R60,

47on,

lO%, 1/4w, camp. ................. 01121 CB-471-N% R76-470

~604

22x1, 10%. 1

/4!J. camp. ................

01121

CB-223-10x

R76-??K

R605

li)K!!, 10%. 1/4w, camp. ................

01121

CB-18510%

R76-18K

R606

ma, 10%. 1,4w. camp. ................

01121 C&183-10% R76-18K

48

_.

I

107,

Quantity

DescriFcion

Keithkay

Rw!uFred

Part NO.

Bracket, near Panel. holds PC-318

1

m-18

screw. Phulipa. Pan ad., 4-40 x S/16”

1

-

Kep N”f, 4-40

1

-

Lug. solder

1

I,"-2

connector, Male, Line w.*"s)

1

m-254

Screw, Phillips, Pan Hd., 4-40 x 5/16"

2

__-

Fuse Holder, for F301

1

FN-11

Hardware for w-313, Logic Board:

Screw, Phillipa, Pan Hd., Self Tap. 2-56 x l/4"

2

_-_

Hardware for K-319, Readout Board:

screw, Phillips, Pan Hd., 4-40 x 518"

1

__-

"eat Sink, for QA-301 hIregrated CirC"it

1

"S-11

Hole Plugs. Plastic, for Bottom-Cover Ewce8s holes to c402

and c403

2

UP-18

Jumper. hmny Resiscar. for PC-318

1

J-3

Line (Mains) Power Cord SBL

1

co-7

Mounfing Kit. for Q405 *ranaiator

1

IX-6

Mounting NW., for s402

1

PA-59

Plate, Cover. Calibrarion Access

1

2534BA

screw, Slotted. Round Hd., 2-56 x l/4"

2

_-

*12se. cover @o"-acceas)

1

25388A

Screw, Phillips, 4-40 x l/4"

2

---

Kep Nut, 4-40 2

--_

Readour Block, Film overlay

1

25544A

Readout Block. Function (leas overlay)

1

25,388

Readout Display, Window. Prom Panel

1

25527.4

sbxcing Link, Input

1

BP-6

Socket, for DNl03, DN104, DN105, DN106 LED readout ~ispal,.s

4

so-70

Socket, 'B-Pin. for QA501. QA502 Integrated Circuits 2

So-69

spacer, Front Panel an* PC-Board

1

25358A

Washer, Brass. for 5403

1

WA-S8

Washer. far D401. 0402. D403. D404 Rectifiers

4

WA-2

Washer, for S402

1 WA-65

1073

R

I

n

L.

L .

­. ._-

--I

-I-

-

II

I!

ri

i

-

I
/

I

L

L

-

, .:<

. .

i C’,

, ri,
: :i-

i/j

.I

*

I I

/

..__.. ___-..

-

----

I

I

L

I

I

I I ‘III