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Test Instrumentation Group
Keithley Instrumenthlnc.
28773 Aurora Road
Cleveland, Ohio 44139
(216) 248X400 . Fax: (216) 498-2704
BZiii;

Service Manual
Model 1765
Contains Servicing/Calibration Information for

Models 136 and 176

Kaithley Instruments. Inc.
28775 Aurora Road/Cleveland. Ohio 44139/(216) 248-0400
WARRANTY
We warrant each of our products to be free from defects in material
and workmanship. Our obligation under this warranty is to repair
or replace any instrument or partthereof which, within a year after
shipment, proves defective upon examination. We will pay local
domestic surface freight costs.
To exercise this warranty, write or call your local Keithley repre-
sentative, or contact Keithley headquarters in Cleveland, Ohio.
You will be given ,prompt assistance and shipping instructions.

REPAIRS AND
CALIBRATION
Keithley Instruments maintains a complete repair and calibration
service as well as a standards laboratory in Cleveland, Ohio.

A Keithley service facility at our Munich, Germany office is
available for our customers throughout Europe. Service in the
United Kingdom can be handled at our office in Reading. Addition-
ally, Keithley representatives in most countries maintain service
and calibration facilities.

To insure prompt repair or recalibration service, please contact
your local field representative or Keithley headquarters directly
before returning the instrument. Estimates for repairs, normal
recalibrations and calibrations traceable to the National Bureau of
Standards are available upon request.

KeithleyIns&nents, Inc.128775Aurora Road/Cleveland, Ohio 44139/U.S.A./(216) 248400/T&x: 985469
WEST GERMANY: KeithieyInshumentr
GmbH/Heiglhofstrasse S/D-8003 Mitnchen 70/@89) 7l4-4&6.5/Telex: 52121 60
GREAT BRlTAIN: Keitbley Instruments, Ltd./l, B&ton RoadlCEReadi~ Berkshire RG2 ONU(O734) 86 12 87/T&~: 847047
WCE: Keithley htrvments SARL12 Bis, Rue Leon Blum/B.P. 60/91121 Palaiseau C&.x/(6) 011,51,55/Tekx: 600933F
NEIHERLANDS: Keithley Instrvments B.V./Leid&raatweg 149/Postbus 1190 /NL-WcerderJ(O34EO) 13 M3/Telex: 40 311
SWITZERLAND: Keithfey Instruments SA/Filiale DttbendorflKriesbachstr. 4fCH-8603 D&zndorf/Ol 82194 44/T&x: 57 536
AUSTRIA: Keitbley Instruments HandeL+Gesekbaft m.b.H.IDbbliier Hauptstr.32/A-119C Wien/O222 314 289/T&x: 13 45 W
TABLE OF CONTENTS
SECTION TITLE PAGE
1 GENERAL INFORMATION ............................................................ 1-l
1-l iNTRODUCTlON .....................................
1-4 FEATURES.. ........................................ . . . . . . ..........................
1-6 WARRANPIINFORMATION .............................. .... ..... ....... ... .. .......
1-E MANUAL ADDENDUMS .............................................................
l-i0 SAFETY SYMBOLS AND TERMS ......................................................
l-12 UNPACKING AND INSPECTING .......................................................
1-14 SPECIFICATIONS ....................................................................

2 r\CCC~~""lC~ ................................................. .................
2-l GENERAL ......................................................
2-2 MUTUAL ACCESS ,ORlES ........................................ .................
2.10 MODEL 135 EXCLUSIVE ACC ESSORIES., .......................
2-13 MODEL 176 EXCLUSIVE ACC ESSORIES ......................... .................
3 rc"r""I"I~NLc "CnlrlLAI I"N .......................................................
3-1 GENERAL ...........................................................................
3-6 MODEL 135 PERFORMANCE VERIFICATION ..........................................
3.12 MODEL 176 PERFORMANCE VERIFICATION ..........................................

4 lrlC""T vr "rEI(CIII"N .............................................................
4-I GENERAL ...........................................................................
4-2 MODEL 135 OVERALL FUNCTIONAL DESCRIPTION ...............................
4-9 MODEL 176 OVERALL FUNCTIONAL DESCRIPTION ............................... ::::

5 MAINTENANCE (TROUBLESHOOTING. CALISRATIONI. ............. ...............
5-l GENERAL .......................................................
5-2 MODEL 135 CALIBRATION ......................................
5-5 TROUBLESH DOTING .............................................
5-10 MODEL 176 CALIE 3RATION ........... .......................... ..............
5-13 MODEL 176 TROU IELESHDOTING ................................ ..............
5.17 CURRENT FUSE REIPLACEMENT .................................. ..............
5-18 MODEL 1766 TROuurc: "-`-1HOOTING ...............................

6 REPLACEABLE PARTS ...............................................................
6-l GENERAL ...........................................................................
MODELS 135/l 76 GENERAL INFORMATION

Model 135/l 76 Service Manual
Section 1. General Information

l-l. INTRODUCTION Htgh lrequencv (RFI probe allows YOU< 3MM !a
l-2, The Modeis 135/176 are low cos,. 4-l/2 d~gt,. measure from 0~25V 10 30V rms AC ow a Fred
LCD dtsplav digatal muitimeters. The two me!ers are quency range from 1OOKHr 10 iOOMHz
unfque in that they are sfm~lar in electromc design ye,
different I" case design. The most obvious dhiference 1s 50 ampere wrren, Shun, aiiow~ YOU, DMM 10
the phvwal dilference. The 176 is designed tnro a more measure up 10 50A. AC or DC
,rad,I,onal DMM case whlie the 135 is designed #"to a
hand held case. The 176 has more current ranges and a Clamp on AC curie", probe al,ows vour 9M11 !o
w,der frequency span for ACV. They both have a basx DC measure up 10 200A rms AC
accuracy of 0 05% and also a basic OHMS accuracy of
0.2%. They also bastcallv have the same A/D converter Htgh Voiiage Probe allows your DMM ,c reas;`r
l-3. Thus manual 1s a comeinatmn of sewce rnformatjon from 1 OOOV 10 40KV DC
for both DMM's (1 35 and 176) I, contans tnformarlon
necessary to maintain. caitbrate and troubleshoa Ihe NOTE
Model 135 and the Model 176,

1-4. FEATURES
l-5. The 135 and 176 have many d,s,,nc, fearures and
advantages some 01 which are l,s,ed below: l-6. WARRANTY INFORMATION
1-7~ The warranty is gwen on ,he instde front cover ci
. ,h,s instruction ma""al~ If there IS a need 10 exercise ine
A 20000 count I,.`-1 12 d,g,t, Iiqu,d crvstal dtspiav.
warranty contact the Kenhlev Representawe 10 vour area
[LCD) ,w,h large 0 6 ,nch numerals The 176 has
to de,etm,"e the proper act,o" to be take" Kelrhiey slain-
functnn and fange ,nd,cators. The 135 and 176
fans serwce fac,l,,les I" the Untted Klngaom `.",esr
have a low ba,,eiv lndlcator that hghts when there
Germany and I" ,he UnIted States Check ,ne !ns~de.roni
IS less than 10% battery life rema,"i"g. Appro-
cover of lhls manual for addresses
prtale declmai point and minus stgn (~1 areaisodls-
played, posirive polarttv IS ,mplied.
l-8. MANUAL ADDENDUM8
l-9, ,mpr~vements or changes tha, affec, iqese ~nsfru-
. The Model 135 and 176 are bull, rugged. The hand
ments which occ"r affer pil",l"g of the I"s,rdc,,on
held case and the bench s,ze case are molded from
impact-res~stan, plastic. Effective ,npu, profection Manual wlil be explained on anaddendum sheelartacnea
prevents damage on ail functmns. to the jnside back cover,

l-10. SAFETY SYMBOLS AND TERMS
. The 176 pushbuttons are color coded to the front 1-l 1~ Safe," symbols used ,n lhis manual are as foilows
pane, for qwck and easy selecr~on of functton and
range. The 135 rotarv fun&on and range swlch The symbol&an rhe ~nstrumen, denores lha, ihe user
are easdy pos,r,oned to color coded functtons and should refer 10 the operarIng insfrucf~ons
ranges. The decimal pan, is automatlcallv pow
tloned by the range pushbu,,on/rofarv switch. The The symbol 1 on the ~nswumen, denotes rhat I OCOV
176 dlsplav annunciators indicate rhe selected or more may be present on the ,erminai~s,
function and range. Improper range and function
comb,na,,ons are lndlcated bvcontradalng func- The WARNING used in th,s manual explains dangers
bon and/or range annunc,alors appear,ng a, the that could resulf tn personai tn,urv or dean
same rime.
The CAUTION used I" ,h,s manual expiains hazar?s :?a,
. Stare of the arr technology and stable prectsio" could damage the ~nsrrumen,,
components have been used I" these two DMM's
to prov,de iong term accuracy and m,",mtze main- l-12. UNPACKING AND INSPECTION
tenance. Calibration IS required only once a year. 1 13 The Models~l 35 and 1 76 were carelullv 8"speclea
If aikal,"e battertes are used /SIX C cells I" the 176 borh mecha",ca,,v and eiec,wallv before snipmenl "pan
or one 9 volt ceil for the 1351 battery IIfe can be as rece,w"g either or bolh of these instrumeni~. unpack a!!
long as 1000 hours for the I 76 and 100 hours for items from the sh,pp'"g container and check for a"" 00~5~
the 135 ous damagethat may have occurred during ira"s8, Reoor:
any damage 10 the shtppmg age",, Retain and use :hi
. Opttonal accessories can be ordered To extend the orig,"a, packag,ng ma,er,a,s ,f reshIpme", 15 "ecessar,
measurement capabtlttvof me 135 and 176. Some The followmg ,,ems are sh,pped wr,h alI `35 a"3 : :<
of these accessor,es are' orders~
GENERAL INFORMATION MODELS 135/176

A. Model 135 or 176.
5, A copy ot the appiopnate Operator's Manual,
C. SuppIled Accessmes: 176 (Mod&l 1768 Battery Pack
with batteries, Modei 1691 Test Lead Set, 135 (9V
batterv. Model 1691 Test Lead Setl
D, Installed or separate opf~onal accesso~,es. as orderea

1-14. SPECIFICATIONS
l-1 5. Detailed speclflcations for both instruments are
given on the foilowIng pages

FIGURE l-l FIGURE 1-2
135 DIGITAL MULTIMETER 176 DIGITAL MULTIMETER

176 SPECS
MODELS 1351176 GENERAL INFORMATION

135 SPECS

l-3
MODELS 135/176 ACCESSORIES

Section 2. Accessories

2-1. GENERAL 2-6. Model 1681 Clip-On Test Lead Set
This sect,on describes the various accessor,es and The Model 1681 contains two leads I 2rr 146 inches,
opiio"s avatlable ior use wth Ihe Models 135 and 176. long. lhat are terminated w,th banana piug and sarong-
Some of the followlng accesswe are for use only vath acI10" cltp-on probes.
the Model 135 and some are for use onlvwlth the Model
176~ These accessoi~es w,ll be clearly potnted out as ,o
which instrument they are used wlth~

2-2. MUTUAL ACCESSORIES
The following accessories can be used wrh e,ther rhe
Model 135 or the Model 176.

2-3. Model 1 SOOA High Voltage Probe
The Mode! 16OOA extends the DMM to 40kV. it has a
1000: 1 d,v,s,on rar,owhich means that 1 volt on the DMM
Corresponds to 1 kV
To Operate: Set the DMM to DCV and 200 Volt range,
Connect the all~garor CLIP on the Model 1600Ato source
Iowa Connecl rhe probe top to so"ice high.
Specifications:Voltge Range: 0 to 40.000 volts DC
Input Reslsrance: 1000 megohms.
Dlvlsion RatlO. 1000 I
Ratto Accuracy~
1000 to 1 +2% terminated in IOMR
2000 to : +5% terminated I" I Mn

FIGURE 2-3
CLIP-ON TEST LEADS

2-6. Model 1682A RF Probe
Model 1682A RF Probe allows voltage measuremenrs
from 1 OOkHz to 250MHz
To Operate: Set the DMM to DCV and appropriate range
Connect the Model 1682A to the DMM input ,acks
Specifications
FIGURE 2-1 AC to DC Transfer Accuracy: (7.3X? 5