Keithley 135, 176, 1765 Service manual

Service Manual

Model 1765

Contains Servicing/Calibration Information for

Models 136 and 176

Test Instrumentation Group

Keithley Instrumenthlnc.

28773 Aurora Road
Cleveland, Ohio 44139
(216) 248X400 . Fax: [phone]

BZiii;

Kaithley Instruments. Inc.
28775 Aurora Road/Cleveland. Ohio 44139/[phone]

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 repre­sentative, 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. Addition­ally, 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.

Keithley Ins&nents, Inc.128775 Aurora Road/Cleveland, Ohio 44139/U.S.A./(216) 248400/T&x: 985469

WEST GERMANY: Keithiey Inshumentr 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
1

1-l
1-4

1-6
1-E
l-i0

l-12
1-14

2
2-l
2-2

2.10
2-13

3
3-1
3-6

3.12

4
4-I
4-2
4-9

5
5-l
5-2
5-5
5-10
5-13

5.17
5-18

TITLE

GENERAL INFORMATION

iNTRODUCTlON

FEATURES..
WARRANPIINFORMATION
MANUAL ADDENDUMS
SAFETY SYMBOLS AND TERMS
UNPACKING AND INSPECTING
SPECIFICATIONS

r\CCC~~““lC~

GENERAL
MUTUAL ACCESS
MODEL 135 EXCLUSIVE ACC

MODEL 176 EXCLUSIVE ACC

rc”r”“I”I~NLc “CnlrlLAI I”N

GENERAL
MODEL 135 PERFORMANCE VERIFICATION
MODEL 176 PERFORMANCE VERIFICATION

lrlC”“T vr “rEI(CIII”N .............................................................

GENERAL
MODEL 135 OVERALL FUNCTIONAL DESCRIPTION

MODEL 176 OVERALL FUNCTIONAL DESCRIPTION ...............................

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

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

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

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

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

,ORlES

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

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

MAINTENANCE (TROUBLESHOOTING. CALISRATIONI.

GENERAL
MODEL 135
TROUBLESH
MODEL 176 CALIE
MODEL 176 TROU
CURRENT FUSE RE
MODEL 1766 TROuurc:

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

CALIBRATION

DOTING

3RATION
IELESHDOTING
IPLACEMENT

“-‘-1HOOTING

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

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

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

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

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

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

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

ESSORIES.,

ESSORIES

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

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

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

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

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

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

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

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

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

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

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

. . . . . .

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

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

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

PAGE

1-l

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

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

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

::::

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

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

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

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

6
6-l

REPLACEABLE PARTS

GENERAL

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

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

MODELS 135/l 76

GENERAL INFORMATION

Model 135/l 76 Service Manual

Section 1. General Information

l-l. INTRODUCTION

l-2, The Modeis 135/176 are low cos,. 4-l/2 d~gt,.
LCD dtsplav digatal muitimeters. The two me!ers are
unfque in that they are sfm~lar in electromc design ye,
different I” case design. The most obvious dhiference 1s
the phvwal dilference. The 176 is designed tnro a more
,rad,I,onal DMM case whlie the 135 is designed #“to a
hand held case. The 176 has more current ranges and a

w,der frequency span for ACV. They both have a basx DC

accuracy of 0 05% and also a basic OHMS accuracy of

0.2%. They also bastcallv have the same A/D converter
l-3. Thus manual 1s a comeinatmn of sewce rnformatjon

for both DMM’s (1 35 and 176) I, contans tnformarlon
necessary to maintain. caitbrate and troubleshoa Ihe

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:

.

A 20000 count I,.‘-1 12 d,g,t, Iiqu,d crvstal dtspiav.

[LCD) ,w,h large 0 6 ,nch numerals The 176 has

functnn and fange ,nd,cators. The 135 and 176

have a low ba,,eiv lndlcator that hghts when there

IS less than 10% battery life rema,“i”g. Appro­prtale declmai point and minus stgn (~1 areaisodls­played, posirive polarttv IS ,mplied.

.

The Model 135 and 176 are bull, rugged. The hand

held case and the bench s,ze case are molded from

impact-res~stan, plastic. Effective ,npu, profection

prevents damage on ail functmns.

Htgh lrequencv (RFI probe allows YOU< 3MM !a
measure from 0~25V 10 30V rms AC ow a Fred
quency range from 1OOKHr 10 iOOMHz

50 ampere wrren, Shun, aiiow~ YOU, DMM 10

measure up 10 50A. AC or DC
Clamp on AC curie”, probe al,ows vour 9M11 !o

measure up 10 200A rms AC
Htgh Voiiage Probe allows your DMM ,c reas;‘r

from 1 OOOV 10 40KV DC

NOTE

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
warranty contact the Kenhlev Representawe 10 vour area
to de,etm,“e the proper act,o” to be take” Kelrhiey slain­fans serwce fac,l,,les I” the Untted Klngaom ‘.“,esr
Germany and I” ,he UnIted States Check ,ne !ns~de.roni
cover of lhls manual for addresses

l-8. MANUAL ADDENDUM8

l-9, ,mpr~vements or changes tha, affec, iqese ~nsfru­ments which occ”r affer pil”,l”g of the I”s,rdc,,on
Manual wlil be explained on anaddendum sheelartacnea
to the jnside back cover,

.

The 176 pushbuttons are color coded to the front
pane, for qwck and easy selecr~on of functton and
range. The 135 rotarv fun&on and range swlch
are easdy pos,r,oned to color coded functtons and
ranges. The decimal pan, is automatlcallv pow
tloned by the range pushbu,,on/rofarv switch. The

176 dlsplav annunciators indicate rhe selected
function and range. Improper range and function
comb,na,,ons are lndlcated bvcontradalng func­bon and/or range annunc,alors appear,ng a, the
same rime.

.

Stare of the arr technology and stable prectsio”
components have been used I” these two DMM’s
to prov,de iong term accuracy and m,“,mtze main­tenance. Calibration IS required only once a year.
If aikal,“e battertes are used /SIX C cells I” the 176
or one 9 volt ceil for the 1351 battery IIfe can be as
long as 1000 hours for the I 76 and 100 hours for
the 135

.

Opttonal accessories can be ordered To extend the
measurement capabtlttvof me 135 and 176. Some
of these accessor,es are’

l-10. SAFETY SYMBOLS AND TERMS

1-l 1~ Safe,” symbols used ,n lhis manual are as foilows

The symbol&an rhe ~nstrumen, denores lha, ihe user
should refer 10 the operarIng insfrucf~ons

The symbol 1 on the ~nswumen, denotes rhat I OCOV
or more may be present on the ,erminai~s,

The WARNING used in th,s manual explains dangers
that could resulf tn personai tn,urv or dean

The CAUTION used I” ,h,s manual expiains hazar?s :?a,
could damage the ~nsrrumen,,

l-12. UNPACKING AND INSPECTION

1 13 The Models~l 35 and 1 76 were carelullv 8”speclea
borh mecha”,ca,,v and eiec,wallv before snipmenl “pan
rece,w”g either or bolh of these instrumeni~. unpack a!!
items from the sh,pp’“g container and check for a”” 00~5~
ous damagethat may have occurred during ira”s8, Reoor:
any damage 10 the shtppmg age”,, Retain and use :hi
orig,“a, packag,ng ma,er,a,s ,f reshIpme”, 15 “ecessar,
The followmg ,,ems are sh,pped wr,h alI ‘35 a”3 : :<

orders~

GENERAL INFORMATION

MODELS 135/176

A. Model 135 or 176.

5, A copy ot the appiopnate

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

Operator’s Manual,

1-14. SPECIFICATIONS

l-1 5. Detailed speclflcations for both instruments are

given on the foilowIng pages

135 DIGITAL MULTIMETER

FIGURE l-l

176 DIGITAL MULTIMETER

FIGURE 1-2

176 SPECS

MODELS 1351176

GENERAL INFORMATION

135 SPECS

l-3

MODELS 135/176

ACCESSORIES

Section 2. Accessories

2-1. GENERAL

This sect,on describes the various accessor,es and
opiio”s avatlable ior use wth Ihe Models 135 and 176.
Some of the followlng accesswe are for use only vath

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 :

2-4.

Model 1651 50 Ampere Shunt

The Model 1651 allows current meawrements to be
made from 0 to 50 amperes DC and from 10 to 50 am­peres AC, It 1s a 0.001 ohm *l% 4.terminal shunt. A fifty
ampere current WI,, correspond to 50 m,ll,volts~

To Operate: Connect separate current leads (not fur­mshed) between the source and the Model 165 1 hex­head bolts. Use leads that are rated

cap.xW Connect thevoltage leads ifurnlshedi between
the Model 1651 screw termmals and the DMM INPUT
terminals. Set the OMM 10 ACV and 2V range or DCV
and 2V range,

+5% terminated I” I Mn

FIGURE 2-1

1600 HIGH VOLTAGE PROBE

UP

10 50 ampere

2-6.

Model 1681 Clip-On Test Lead Set

The Model 1681 contains two leads I 2rr 146
long. lhat are terminated w,th banana piug and sarong­acI10” cltp-on probes.

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:

Connect the Model 1682A to the DMM input ,acks
Specifications

AC to DC Transfer Accuracy: (7.3X? 5°C) tld6 !rom

1OOkHz to 250MHz at 1V. peak iespondlng. calibrated

i” ims of a slnewave. compat,ble with 1”5lr”ments wiin

1OMR Input res.,srance

Voltage Range: 0.25V to 15V rms

Maw&m Aliowable Input: 50V AC peak. 2OOV (DC+
AC ~eakl
Makmufk Common Mode Voltage. 30V rms. 42 peak
Input Capacitance: 5pF Typical
OperarIng Temperature: 0” to 50°C
Cable Length: 1~5 meters
Accessories Supplied: ENC Adapter. insuiaring TID,
IC Tip. Spring Hook. Carrymg Pouch

Set the DMM to DCV and appropriate range

inches,

FIGURE 2-2

1651 50 AMPERE SHUN1

FIGURE 2-4

1662 RF PROBE

ACCESSORIES ACCESSORIES

MODELS 135/176

2-7. Model 1663 Universal Test

2-7. Model 1663 Universal Test

Two test leads. 1.2m (48 inches) long w,th 12 screw-in Two test leads. 1.2m (48 tnches) long vat,, 12 screw-in

tips. 2 banana plugs. 2 spade lugs. 2 alligator clips wfh tips. 2 banana plugs. 2 spade lugs. 2 alligator clips wfh

boors. 2 needle ups w,th chucks and 4 heavy duty ftp boors. 2 needle ups w,th chucks and 4 heavy duty ftp
plugs.

Plugs

FIGURE 2-5 FIGURE 2-5

1683 TEST LEAD KIT 1683 TEST LEAD KIT

2-S. Model 1686 Clamp-On AC Current Probe

2-S. Model 1686 Clamo-On AC Current Probe

The Model 1665 meawres AC current by clampIng onto The Model 1665 mea?.“& AC current by clampfng onto
a s,ngle conductor. Interrilptmn ot the current path IS a s,ngle conductor. Interrilptmn ot the current path IS
unnecessary, The Model 1665 detects current by sensing unnecessary, The Model 1685 detects current by sensing
the magneuc field produced by the current flow. the magneuc field produced by the current flow.

To

Operate:

Operate:

range. The DMM WI, dtsplay O.lV rms per ampere. range. The DMM WI, dtsplay O.lV rms per ampere.

Set the DMM to ACV and the appropriate To

Set the DMM to ACV and the appropriate

Lead Kit

Lead Kit

FIGURE 2-7

1691 TEST LEAD SET

Z-10. MODEL 135 EXCLUSIVE ACCESSORIES
2-l 1. Model 1304 Soft Carrying Case and Stand.

The Model 1304 IS a soft carrying case and stand (t,lt
baili for Kelthley’s hne of hand held instruments.

The instrument can be secured Inside the case wfth the
thumbscrew (suppledI. if dewed, The thumbscrew IS
also used 10 secure the stand (tilt bail) fo set the ,nsfru­men! upnghf.

1685 CLAMP-ON AC CURRENT PROSE

FIGURE 2-S

2-S. Model 1691 General Purpose Test Lead Set

The Mode, ,691 General Purpose Test Lead Se1 CO”SIS,S
of fwo 0,9 I mm (36 Inches) test leads wirh probe ups
iermlnated I” banana plugs

2-2

FIGURE 2-8

SOFT CASE AND STAND

FIGURE 2-9

1306 DELUXE CASE

2-12. Model 1306 Deluxe Carrying Case.

Model 1306 Deluxe Case is a rugged DMM carwng case
that IS large enough to accommodate the 135 plus var­IOUS other DMM art~cies such as a spare battery. fes,
leads. ew

MODELS 135/176

2-13. Model 1369 Spare Parts Kit

The Model 1359 is a spare parts kit for rhe Model 135
It CO”SISIS of a compIeme”t oi specially seiected spare
pans fhar wlil manta!” several 135 DMM’s for one year
The parts are INsted I” Table 6-2 of Sectlo” 6. Replace­able Parts,

2.14. MODEL 176 EXCLUSIVE ACCESSORIES

2.16. Model 1010 Rack Mounting Kit

The Mode, 1010 Rack Mounting Kit permits the mou”,-

,ng of a single DMM to a standard 5-l 14 in x 19 i” rack

2-16. Model 1017 Rack Mounting Kit.

The Model 1017 Rack Mounting Ktt permits rhe mount­,“g of two DMM’s s,de by sde I” a srandard 5- 1 /4 I” x

19 I” lack.

2-17. Model 1684 Hard Shell Carrying Case

The Mode, 1684 hard she,, carrv~ng case IS a hard wny,
case which is 4 I” v 13 I” Y 14 I” (100mm x 300mm x
350mml~ Ii has a fltfed foam lnserf wth room for 1he
DMM. ~“struct!o” book and small accessories

FIGURE

1766

ACCESSORIES

2-l 1

ELIMINATOR

FIGURE 2-10

HARD CASE

2-18. Model 1766 Battery Eliminator

The Model , 766 Batrerv Ei,m~“ator permits the user to

operate the 176 or 169 from lhne power. The 1766 pro-

vldes the necessary DC voltage to Operate the 176 or

169.

The 1766 firs I” piace of the battery pack (Model

1766) so therefore, precludes the use of the battery pack

(Model 1768). The Model 1766 is capable of working
from a wde range of line voltages such as from 1 OSVAC
to 250VAC to 50HZ or 60HZ.

BAmEAY

BATTERIES

FIGURE 2-12

SAl-rERY PACK

HOLDER

2-20. Model 1769 Spare Parts Kit

The Model 1769 1s a spare parts ii, for ,he MOdeI : 76
it co”sIsts of a compiement of SPeclallY seiecreo space
parts that WIII ma~ntai” several 176 DMM’s lor cne veai
The parts are listeci I” Table 6~3 01 Seci~on 6 Rep!aceaale

Parts,

MODELS 135/l 76

Section 3. Performance Verification

3-1. GENERAL

This secf~on gtves a Performance Verilvzat~on procedure
for both the Model 135 and the Model 176. Each proce­dure wtil be presented separately I” order to avo,d con­fus,on,

3-2 Performance Verlficatlon may be performed upon
recetpt of enher ~nstr~rnenf (1 35 or 1761 10 ensure that
no damage or m,sad,ustmen, has occurred dung trans,,.
Verlficatlon may also be performed whenever there IS
quewcr of elther instrument’s acculacv and foIlowIng
cahbraron. if desired.

PERFORMANCE “ERlFlCATlON

NOTE

3-3. Environmental Conditions For Both Instruments

In order to perform the Performance Verlflcatton the
instr~men, to be venfied m”st be between 1 B’C to 2B’C
at less than 80% R.H.

3-4. Recommended Test Equipment

Recommended test equipment for performance verlfl­cat,on of both instruments IS hsted in Table 3- 1 Alternate
test equipment may be used. However. 11 the accuracy IS
not at least 3 ttmes better than the instruments speclfl­camns. addlnonal allowance mwt be made m the read­I”@ obtalned.

RECOMMENDED TEST EQUIPMEN

TABLE 3-1

ITEM DESCRIPTION

A DC Calibrator 1v. 1ov. 1oov. 1ooov
B AC Calibrator 1v. IOV. IOOV

High Voltage Amplifier

C

(Used wth Model 745Ai *0.04%

D Decade Resistor 1K. 10K. IOOK. 1000K. 10M
E Cuirenf Calibrator 1 mA. I OmA. 1 OOmA. 1 OOOmA.

i-0.002%
+0.022%

1 ooov

+.02%

10A

+.03% DCA. +.05% ACA

WARNING

All service information is intended for qualt­fied electronic maintenance personnel only.

WARNING
Some procedures require the use of high volt­age. Take care to prevmt contact wth lwe
circuits which could cause electrical shock

resulting in injury or death.

CAUTION

SPECIFICATION

3-1

PERFORMANCE VERIFICATION

3.6. MODEL 135 PERFORMANCE VERIFICATION
3-7. DC Volts Verification

A Select ihe WV funann.
B. Connect the DC Calibrator ,ltem A. Table 3-I) to the

135

C~ Follow Table 3-2 and apply the required DC Voltage

D, Repeat all checks with nega1,v.s voltage

V-R and COM fermnals. Refer to Figure 3- 1

fo, each range, “er~fy rhat each reading IS WI,,,,” spec­iltcatlons iwed tn Table 3-2.

MODELS 1351176

DC VOLTAGE PERFORMANCE CHECK

TABLE 3-2

Range Applied

Voltage

Allowable Reading

at 18’C to 28°C

FIGURE 3-l

135 DC VOLTS VERIFICATION

3-6. AC Volts Verification

A~ Select the ACV functmn.
B. Connecr the AC calibrator (Item 8. Table 3-l) to the

135 V-Rand COM termlnais. Refer fo Figure 3-2,

C, Follow Table 3-3 and ~DDIY the reaulred AC Voltaae

for each range. Venfy th’ai <he reading IS wlfhtn speci­ftca11ons Wed I” Table 3-3.

135 AC VOLTS VERIFICATION

FIGURE 3-2

746A

P

FIGURE 3-3

135 HI VOLTAGE ACV VERIFICATION

3-9. Resistance Verification

A. Select the OHMS funcrlon
By Conneci rhe Decade Resistor (Item 0. Table 3- 1) tothe

135 V-s2 and COM terrmnals. Refer 10 Flgure 3-4,

C. Follow Table 3-4 and apply the

for each range. Vertfythat each read,ng isw,th,n soec­lficatrons Ifsted in Table 3-4

requfred ressstance

AC VOLTAGE PERFORMANCE CHECK

TABLE 3-3

Range

Applied Voltage

l,OOOOVat 10KHz
I O.OOOVat 500Hz

2oov 100OOVat120Hz

Allowable Reading

at 18°C to 28’C

~9885 to LO1 15
9,885to 10,115

98.85to 101,15

I

FIGURE 3-4

135 RESISTANCE VERIFICATION

MODELS 135/l 76

PERFORMANCE VERIFICATION

TABLE 3-4

Allowable Reading

at 1wc to 28Y

9970 to 1,003o

9.978 to 10.022

99.78 to 100.22

997.8 to 1002.2

3.898 to 10.102

i

RESISTANCE PERFORMANCE CHECK

Range

2KR

ZOKR

200Kfl

2000KR

20MR

3-10. DC Amps Verification

A, Select the DC Amps function.

B. Connect the DC Calibrator ,l,em A. Table 3- 11 10 the

tnput of the Current Calibrator (Item E. Table 3-l I
Connect the OU,,,U, of ,he Current Calibrator to the

135’s mA and COM terminals. Refer 10 Figure 3-5.

C. Select the 20mA range and apply a 10,OOmA curren,

to the 135. Ver,fv that the reading IS with,” 9,93 to

10.07.

D. Select the 1 OA range and connect the outp”, of the

Current Calibrator 10 the 135’s 10A Hi and 10A LO
terminals Refer to Figure 3-6

E. Apply lO.OOA to the 135 and ver,fy tha, rhe reading

IS w,,h,” 3.88 to 10.12,

3-11. AC Amps Verification

A~ Select the AC Amps functlon and the 20mA range.

8. Connect the AC Calibrator (Item B. Table 3-l) to the
mput of the Current Calibraror (Item E. Table 3-11
Connect the output of the Current Callbrafor to the

135’s mA and COM term~nais. Refer 10 Figure 3-7

C~ Apply a 10,OO mA currenr a, 500H2 and verliy lhal

the readfng IS w,th,n 9~80 to 10.20~

D. Select the 10A range and connect fhe outp”, of the

Curren, Calibrator fo the 135’s 10A HI and 1 OA LO

terminals. Refer fo Figure 3-8.

E. Apply a 1 O.OOA current at 500Hz and ver,fv that fhe

readang IS wfhin 9.80 10 10.20.

343A

FIGURE 3-6

135 1OA DC AMPS VERIFICATION

FIGURE 3-7

135 AC AMPS VERfFlCATlON

343A

FIGURE 3-5

135 DC AMPS VERIFICATION

135 ,OA AC AMPS VERIFICATION

FIGURE 3-8

PERFORMANCE VERIFICATION

3-12. MODEL 176 PERFORMANCE VERlFlCATlON

3-l 3. DC Volts Verification

A. Select the OC Volts functuon.

6. Connect the DC Calibrator IItem A. Table 3-l) to the
176’s HI and LO ~npu, ierminals. Refer to Fig’ure 3.9.

C. Follow Table 3-5 and apply the required DC Voltage

for each range, Verify tha, each readtng IS wtfhin spec­ifications Ifsted I” Table 3-5.

D. Repeat all checks wtth negatwe voltage,

MODELS 135/l 76

FIGURE 3-10

176 AC VOLTS VERIFICATION

Applied

Voltage

TABLE 3-5

Allowable Reading

at 18°C to 28°C

DC VOLTAGE PERFORMANCE VERIFICATION

Range

4’ 1

I

FIGURE 3-9

I76 DC VOLTS VERIFICATION

3- 14. AC Voltage Verification

A. Select rhe AC Volts funcuon.

By Connect the AC Calibrator and HVAmpllfier iltems B

and C. Table 3-l) to the 176’s HI and LO terminals.
Refer to Figures 3-10 and 3-1 1.

C. Follow Table 3-6 and apply the required AC Voltage

for each range. Verlfythafeach reading iswithIn spec-

lflcatlons listed ,n Table 3-6.

I J

178 HIGH VOLTAGE ACV VERIFICATION

3-15. Resistance Verification

A, Select the OHMS funcnon.
8 Connect the Decade Re%$,or (hem 0. Table 3-I) to the

176 HI and LO ~npu, terminals. Refer to Figure 3.12.

C, Follow Table 3-7 and apply the reqwred resistance for

each ranae. Verlfv that each readina is within soeclfl-

cations ll;ted in fable 3.7~

RESISTANCE VERIFICATION

Range

FIGURE 3-l 1

TABLE 3-7

Applied

Resistance

Allowable Reading

at 18’C to 28’C

1

I

AC VOLTAGE PERFORMANCE CHECK

Range

;:: 1 1 ~OOOOVa, OOOOV at 1 OKHz 1 KHz

2% 1 1 ,OOOOVat O~OOOV at 20KHz 1 KHZ
2ov lO.OOOVat 1OKHz
2ov 10,OOOVar 20KHz

2oov 100 OOV a, 1 KHz

1 ooov 1OOOOVal IKHz

3-4

Applied Voltage

TABLE 3-6

Allowable Reading

at 18°C to 28°C

.9885 ,9885 to to 1.01 1.01 15 15

9,885 9485 to to X0515 10,115

9.885 to 10.1 15

9.485 to 10.515

98.85 10 101,15

988.5 to 101 1 5

176 RESISTANCE VERIFICATION

FIGURE 3-l 2

MODELS 135/176

PERFORMANCE VERIFICATION

3-16. DC Amps Verification

A. Select the DC Amps tunctton.

8. Connect the DC Calsbrator (Item A. Table 3-l I to the
,nputottheCurrentCai,bra,~r ,ltemE.Table 3-11, Con­necf the output 01 the Current Calibraror to the 176 HI
and LO l”p”r terminals. Refer to Figure 3- 13.

C, Follow Table 3-8 and applv the required c”rrenf for

each ranges Verliy ihat each reading IS wrhln spew
flcatlons ilsted I” Table 3-8,.

TABLE 3-6

DC AMPS VERIFICATION

Range

2mA 1~OOOmA ~993 IO 1~007 2mA 1 .OOOmA at 1 KHz 980 to 1320

20mA 1 O~OOmA 9.93 10 10.07 20mA I O.OOmA ar 1 KHz 9~80 10 IO 20

200mA 100 OmA 99.3 to loo,7 20OmA 100,OmA at 1 KHz 9aoto 1023

2000mA 1000 rnA 993 to 1007 2000mA lOOO,mA at IKHz 980 10 1020

343A

Applied
CtlrrWlt

Allowable Reading

at 16°C to 26°C

3-17. AC Amps Verification

A.

Select the !iC Amps funwon

B.

Connect the AC Callbraror jlrem 6. Table 3-1, to the
~“puiotIheCurrentCaiibrator,ltemE,Tab,e3-ti Con­nect the
and LO termnals Refer to F,gure 3-14

C,

Foliow Table 3-9 and apply the required curient for
each range. Vertiy that each reading 1s
cations ksted in Table 3-9

Range

I I

Outpu!

of the Current Callbraior IO the 1 76 Hi

TABLE 3-9

AC AMPS VERIFICATION

Applied Current

Allowable Reading

a* 19°C to 26°C

I

warhtn spew,-

176 DC AMPS VERIFICATION

FIGURE 3-13

176 AC AMPS VERIFICATION

FIGURE 3.14

3-5