artisan 175-AV User manual
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Instra
Model 175AV
AutorangingMultimeter
Instruction Manual
Contains Operating and Servicing Information
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WARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year
from date of shipment.
Keithley Instmments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable
batteries, diskettes, and documentation.
During the warranty period, we will, at our’option, either repair or replace any product that proves to be defective
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 return instructions. Send the product, transportation prepaid, to the indicated service
facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for
the balance of the original warranty period, 01at least 90 days.
LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from product modification without Keithley’s express written consent, or
misuse of any
product
01part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from
battery leakage, 01problems arising from normal wear or failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PRO-
VIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ll?i EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT,
INDIRECT. SPECIAL. INCIDENTAL OR CONSEOUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS
INSTRUMENTS AND’SOFTWARE EVEN IF KEIT%tiY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE
OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIM-
ITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY
PERSON, OR DAMAGE TO PROPERTY.
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Model 175-AV Autoranging Multimeter
Instruction Manual
01989, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Third Printing, October 1999
Document Number: 175.AV-901-01 Rev. C
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Manual Print History
The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revi-
sion Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released
between Revisions, contain important change information that the user should incorporate immediately into the manual.
Addenda am numbered sequentially. When a new Revision is created, all Addenda associated with the previous Revision
of the manual are incorporated into the new Revision of the manual. Each new Revision includes a revised copy of this
print history page.
Revision B (DocumentNumber IX-AV-901-01) ...............................................................................Odoer 1992
Revision C (OaeumentNumber 175.AV-901-01)...............................................................................October 1999
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SAFETY PRECAUTIONS
The following safety precautions should be observed before operating the Model 175-AV.
This instrument is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Read over the manual carefully before operating this instrument.
Exercise extreme caution when a shock hazard is present at the instrument’s input. The American National Standards
Institute (ANSI) states that a shock hazard exists when voltage levels greater than 3lV rms or 42.4V peak are present. A
good safety practice is to expect that a hazardous voltage is present in any unknown circuit before measuring.
Inspect the test leads for possible wear, cracks or breaks before each use. If any defects are found, replace the test leads.
Foroptimumsafetydonottouchthetestleadsortheinstnunentwhilepowerisappliedtothecircuitundertest.Turnthe
power off and discharge all capacitors before connecting or disconnecting the instrument.
Do not touch any object that could provide a current path to the common side of the circuit under test or power line
(earth) ground. Always make measurements with dry hands while standing on a dry, insulated surface, capable of with-
standing the voltage being measured.
Exercise extreme safety when testing high energy power circuits (ac line or mains, etc.). Refer to High Energy Circuit
Safety Precautions found in paragraph 2.2.
Do not exceed the instrument’s maximum allowable input as defined in the specifications and operation section.
Instrumentation and accessories should not be connected to humans.
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Safety Precautions
The following safety precautions should be observed before using
this product and any associated instrumentation. Although some in-
struments and accessories would normally be used with non-haz-
ardous voltages, there are situations where hazardous conditions
may be present.
This product is intended for use by qualified personnel who recog-
nix shock hazards and are familiar with the safety precautions re-
quired to avoid possible injury. Read the operating information
carefully before using the product.
The types of product users are:
Responsible body is the individual or group responsible for the use
and maintenance of equipment, for ensuring that the equipment is
operated within its specifications and operating limits, and for en-
suring that operators are adequately trained.
Operators use the product for its intended function. They must he
trained in electrical safety procedures and proper use of the instm-
meat. They must be protected from electric shock and contact with
hazardous live circuits.
Maintenance personnel
perform routine procedures on the product
to keep it operating, for example, setting the line voltage or replac-
ing consumable materials. Maintenance procedures are described in
the manual. The pmcedures explicitly state if the operator may per-
form them. Otbenvise. they should be performed only by service
personnel.
Service personnel are trained to work on live circuits, and perform
safe installations and repairs of products. Only properly trained ser.
vice personnel may perform installation and service procedures.
Exercise extreme caution when a shock hazard is present. Lethal
voltage may be present on cable connector jacks or test fixtures. The
American National Standards Institute (ANSI) states that a shock
hazard exists when voltage levels greater than 30V RMS, 42.4V
peak, or 60VDC are
present.
A good safety practice is to expect
that hazardous voltage is present in any unknown circuit before
measuring.
Users of this product must be protected from electric shock at all
times. The responsible body must ensure that users .a.=prevented
accessand/or insulated from every connection point. In some cases,
connections must be exposed to potential human contact. Product
usersin these circumstances must be trained to protect themselves
from the risk of electric shock. If the circuit is capable of operating
at or
above
1000
volts,
no conductive
part of the circuit may he
exposed.
As described in the International Elcctrotechnical Commission
@EC) Standard IEC 664, digital multimeter measuring circuits
(e.g., Keithley Models l75A, 199,2000,2001, ZWZ, and 2010) are
Installation Category II. All other instruments signal terminals are
Installation Category I and must not he connected to mains.
Do not connect switching cards directly to unlimited power circuits.
They are intended to he used with impedance limited sources.
NEVER connect switching cards directly to AC mains. When con-
necting sources to switching cards, install protective devices to lim-
it fault current and voltage to the card.
Before operating an instrument, make sure the line cord is connect-
ed to a properly grounded power receptacle. Inspect the connecting
cables, tat leads, and jumpers for possible wear, cracks, or breaks
before each use.
For ma.ximum safety, do not touch the pmduct, test cables, or any
other instruments while power is applied to the circuit under test.
ALWAYS remove power from the entire test system and discharge
any capacitors before: connecting or disconnecting cables or jump-
ers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the
common side of the circuit under test or power line (earth) ground.
Always make measurements with dry hands while standing on a
dry, insulated surface capable of withstanding the voltage being
measured.
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The instrument and accessories must be used in accordance with its
specifications and operating instructions or the safety of the equip-
ment may be impaired.
Do not exceed the maximum signal levels of the instruments and ac-
cessories, as defined in the specifications and operating informa-
tion, and as shown on the instrument or test fixture panels, or
switching card.
When fuses are used in a product, replace with sametype and rating
for continued protection against tire hazard.
Chassis connections must only be used as shield connections for
measuring circuits, N(rT as safety earth ground connections.
If you ax using a test fixture, keep the lid closed while power is ap-
plied to the device under test. Safe operation requires the use of a
lid interlock.
If a @screw is present, connect it to safety earth ground using the
wire recommended in the wer documentation.
The .A
! symbol on an instrument indicates that the user should re-
fer to the operating inshlctions located in the manual.
The A symbol on an instrument shows that it can source or mea-
sure 1000 volts or more, including the combined effect of normal
and common mode voltages. Use standard safety pncautions m
avoid personal contact with these voltages.
The WARNING heading in a manual explains dangers that might
result in personal injury or death. Always read the associated infor-
mation very carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could
damage the instrument. Such damage may invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and
all test cables.
To maintain protection from electric shock and fire, replacement
components in mains circuits, including the power transformer, test
leads, and input jacks, must be purchased fmm Keithley Instrw
meres. Standard fuses, with applicable national safety approvals,
may be used if the rating and type are the same. Other components
that are not safety related may be purchased from other suppliers as
long asthey are equivalent to the original component. (Note that se-
lected parts should be purchased only thmugh Keithley Instruments
to maintain accuracy and functionality of the product.) If you are
unsure about the applicability of a replacement component, call a
Keithley lnshuments office for information.
To clean an instrument, use a damp cloth or mild, water based
cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill
on the instrument. Pmducts that consist of a circuit board with no
case or chassis (e.g., data acquisition board for installation into B
computer) should never require cleaning if handled according to in-
structions. If the board becomes contaminated and operation is af-
fected, the board should be remmed to the factory for pmper
cleaning/sewicing.
Rev. lo/99
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MODEL 175-AV SPECIFICATIONS
DC VOLTS
RANGE
2M) mV
RESOLUTlON
10 uv
ACCURACY
(1 Year)
*v-zBT
ti%rdS + counts)
0.03 + 3
XQV
rTANcEz IlMG on 2M: 100 mV o.B3+2
Imy, ZV,
and 2~~o~;Ses. l0Mi-I on ZOOVand 1ooOVra”Ses. (>lOCOMGon the 2OOmVand 2V
HIHZ, 6OHz M.lS%.
+&C (<lo set per minute on 2CGmVand ZV ranges; 3OOVmu continuous).
e”:%T .Bm) Resolution: O.OldBabove 5% of range.
AC VOLTS
(average respondinp,
RANGE
ACCURACY
(1 Year)*
W-WC
zz Ml-l?+ nmdg + counts)
IOkHZ-
lOkH2 mkkiz ‘ii%- iI%%
‘Above II
MAxlMl
zv-7mv ::2 05+m 1+40 5+200
mni
V
ti munts.
05+m
1.5+40
7*+nn
-
,M ALLOWABLE INPUT: 75OVm,s, IWOV peak (40 seconds per minute on 2@h”V m”Se; 3OOV“XU
~ontbmous).
.__ t typical.
I ~ralleled by c75pF on 2OV,ZOOV,and 1OOOVannes. llh4Q on 2OCmVand 2V ““Se.
107Vwz maximum.
3dB BANDWIDTH: 3OOkI+
INPUT IhfPEDANCE: IOMI: _
s&~~hlMiphd. . .
seconds to within 15 counts of
final radii on ran e.
dB MODE trek 6&X-l): mHz- AC&& ktdBm)
RANGE INPUT 1okHz ZOkIiZ wkxiz
1wkHz
2v-75w 2wmvto75ov 0.2
(-12 to +59.SdBml
200 mv mmvto2wmv 0.2
(32 to -12 dBm)
2mVto2OmV
2
(-52
to -32 dBm)
1mVto2mV
2.
C-58
to -52 dBm)
Resolutian: O.OldBabove 5% of range. *Up to 1kHz.
0.26 0.56
1.2
0.3
1 -
3
-
-
-
OHMS ACCURACY
MAX VOLTAGE
(1 Yea?) ACROSS
lo%wc
RANGE RESOLUnON ti%rdS + comts) tiiEE2
2coD 10 ND 0.05 + 2.
20’ iti 1MmG O.ffi+l
200 h-2 1: :: fit2:
2 Ml-2 **
20
MG l *
‘F&i !a
2w MD ** 1w U-I
20 +1
~~~~~~~~L;~to~ti~liy.
OPEN-CIRCUIT VOLTAGE: +5V.
DIODE TBST:
Display reads junctio” voltaSe up to 2V. Test current: 0.7mA
SE’ITLING
‘I1ME: 2
seconds to withi” 1 count of final reading on range.
DC AMPS
MAXlMUM
RANGE RESOLUTION
E-T,2if
?I2 10 nA
1M “A
i:E
2ii2 1: $ i:E
OVERLOA~PR%TECTlON:
2A’Ese?&OVL externally &&e.
SFITLING TIME: 1 second to within 1 count of final reading.
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AC AMPS
(average responding)
RANGE BURDEN ZOHZ-MHZ n~%rl~cots) 1okHz-3okHz
2w%-2z %Y : 1: i%z 2+50-
2ummA 05 v 1 +20 o.s+m -
*Above 18Wcounka.
SElTLlNG TIME: 2 seconds to within 15c.,“nts of final reading.
IEEE-488 BUS IMPLBMENTATION (Model 1753 0 tion)
MULTILINH COMMAND s: DCL SDC GET GTL L&T, UNL, WE, SPD.
UNILINE COMMANDS: IFC, R!& E61, SRh.
Ati.
IWI?XFACE FUNCTIONS: SHl, AHl. T5, TEO,LA, LEO,SRl, RLZ, Pm, DCl, Ml, CO,EL
PROGRAMMABLE Pm s: Range, REL, dB, EOL Trigger, Calibration, SRQ Status, Output Format, Tm,,i,,ator
GENERAL
DISPLAY: 41/Z digit LCD, 0.5 in. height;
RANGING; Auto or manual on IX volts, Ac? laity, function, range, and status indication.
AUTORANGING
TIME: 3LlOmwc. volts, ohms; manual on AC amps. DC amps.
WARMUP. 1 how to rated accuracy.per range.
RELATlVEz Pushbutton allows zeroing of on range readings. Allows readings to be made with respect to baseline value. Front
and anmmciutor lndlcates REL mode.
DAfA LOGGER
and MIN/hlrv(: 100reading storage capacity; records data at one of six selectable rates from 3 readings/second
to 1readin /hour. Also deteck and stemsmaxim
CONVERBIOn8IWD3 3 readings UN
I second.
OVERRANGE
INDICATION
“g” displa ed.
and xrmimum readings c,,nti,,uawly in data logger mode.
MAXlMUM COMMON MOdE VOLTAGd 5COVDeat
COMMON
MODE
RBJIVXTON RATE0 (1M unb&ncd: >lZOdB at DC, 5OHz, 6OHz ti.15%. %OdB in AC volts.
TEMpERAm@ comam (o”-i80c 6r 2.5~~c): no.1 x applicsble accurav
S@fiCatiOn)/oc
except +:(O.O7%+2)/“C
for 5OHz-1OkHz in AC volts.
E~JR~&Operathg: 00to SOT; 40% relative humidity up to 35’C; linearly date 3% RH/‘C, 35’ to 5WC. Storage
POWERz lQ5-125V or 210-250” @&rnal switch selened), 5L?-6OHz,12VA. Optional &hour battery pack, Model 1758.
DIMBN?ONS, WEIGIiTz B9mm high x 235mm wide x 275mm deep (3.5in. x 9.25in. x 10.75in.).
Net
weight l.Skg (3 Rx., 14
oz.,.
ACCESSORIES SUPPLIED:
Model
1751Safety Test Leads, instruction manuals (2).
A,.C~CC~.,.rm ..r... 1W.E.
‘.~~#aU”“R~T~ n
Model 1010:
Model 1017:
Model 1501:
Model l&WA:
Model 1651:
Model 1681:
y≤ ygAz
Model 16&
Model 1751;
Model 17!i5-A
pde; ;75$
Model 17Si
Model 7008-3:
t$3del7cm.6
IRackMointl.~ ‘kit
peruhuePi-oh.2-WC to +lMTl
$
~Voltag~.Pmbe WkVl
,.-__
t Lead Kit
A)
(3
I 0
ft.)
i ft.)
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Table of Contents
SECTION 1 - General Information
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
INTRODUClTON .................
FEATURRS ......................
WARRANTY INFORMATION .......
MANUAL ADDENDA .............
s~sYMBo~ANDTERMs .....
SPBCIFICATIONS ................
INSPECTION ....................
USING TI-IE MODEL 175-AV MANUAL
GETTING STARTED ..............
ACCESsORIES ...................
SECTION 2 - Bench Operation
2.1
2.2
2.3
2.3.1
2.3.2
2.3.3
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.5
2.6
2.6.1
2.6.2
2.7
2.7.1
2.7.2
2.7.3
2.7.4
2.7.5
2.7.6
2.7.7
2.7.8
2.7.9
2.7.10
2.8
2.8.1
2.8.2
INTRODUCTION ..........................
HIGH ENERGY CIRCUIT SAFETY PRECAUTIONS
PRBPARATION FOR USE ...................
LinePower ..............................
Battery Pack Power ........................
Battery Charging. .........................
FRONTPANELF AMLMREA’ITON ............
Display .................................
Front Panel Controls .......................
InputTerminals ..........................
AMPS Fuse Replacement ...................
ERROR MESSAGES .........................
OPERATING CONDITIONS ..................
Fnvironmental conditions ..................
Maximum Allowable Inputs .................
BASIC BENCH MEASUREMENX ..............
Power-Up.. .............................
RelativeMode ............................
Dc Voltage Meaanremenls ...................
Average AC Voltage Measurements ............
Resiitance Measurements ...................
Current Measurements (dc or average ac) .......
dB Measurements .........................
dB Measurement Considerations and Applications
m/MAX and lOO-Point Data Logger Operation .
DiodeTest ..............................
AVERAGE RESPONDING MEASUREMENTS . . , . .
Waveform Comparison .....................
Ac Voltage Offset .........................
......................
......................
......................
......................
......................
......................
......................
......................
......................
......................
......
......
..........
..........
..........
..........
........
........
........
.......
.......
.......
.......
.......
........
........
........
........
.........
.........
.........
.........
.........
........................
........................
........................
........................
........................
........................
........................
l-l
l-l
l-1
l-l
1-l
l-2
l-2
1-2
l-2
1-3
2-l
. 2-l
. 2-l
. 2-l
. 2-2
. 2-2
. 2-2
2-3
. 2-3
2-3
. 23
2-4
. 24
. 2-4
. 2-4
. 2-4
. 25
. 2-5
. 2-6
. 2-6
. 2-7
. 2-7
. 2-8
. 2-10
2-11
2-11
. 2-11
. 2-12
2-14
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2.8.3 Extended Frequency Response .................................................. 2-14
SECTION 3 - Performance Verification
3.1 INTRODUCTION ............................................................. 3-l
3.2 ENVIRONM-ENTALCONDlTIONS.. .............................................. 3-l
3.3 INITIAL CONDITIONS ......................................................... 3-l
3.4 RECOh4MBNDED TEST EQUIFMENT ............................................... 3-l
3.5 VERIFICATION PROCEDURE .................................................... 3-l
3.5.1 DcVoltageVerification ........................................................ 3-l
3.5.2 ,Average Ac Voltage Verification ................................................. 3-2
3.5.3 Resistance Verification ........................................................ 3-3
3.5.4 DC Current Verification ........................................................ 3-3
3.5.5 AverageAcCurrentVerification ................................................. 3-3
3.5.6 Diode Test Current Verification .................................................. 3-3
SECTION 4 - Principles of Operation
4.1 INTRODUCTION .............................................................
4.2 OVERALLFUNCTlONALDESCRIPTION.. .........................................
4.3 ANALOGC~~Y ..........................................................
4.3.1 Multiplexer. ................................................................
4.3.2 InputBufferAmplifier ........................................................
4.3.3 -2V Reference Source .........................................................
4.3.4 A/DConverter ..............................................................
4.3.5 InputsignalConditio~g ......................................................
4.3.6 Ac Converter ...............................................................
4.4 DIGITAL CIRCUITRY ..........................................................
4.4.1 Microcomputer ..............................................................
4.4.2 AddressDecoding ...........................................................
4.4.3 Pu ...... : ................................................................
4.4.4 Display Board ...............................................................
4.5 DIGlTAL CALIBRATION ........................................................
4.6 POWERSUPPLY ..............................................................
4.7 MODEL1758BATTERYOpTION ..................................................
41
4-l
4-2
42
4-2
42
43
4-4
4-5
45
45
4-6
4-6
4-6
44
4-6
4-6
SECTION 5 - Maintenance
5.1 INTRODUCTION. ............................................................. 5-l
5.2 LINBVOLTAGESELECTION .................................................... 5-l
5.3 FUSEREPLACBMENI .......................................................... 5-l
5.3.1 AMpsFuSe ................................................................. 5-2
5.3.2 Line Fuse .................................................................. 5-2
5.4 CALIBR4TION ............................................................... 5-2
5.4.1 RecommendedCaIibrationEquipment ............................................ 5-3
5.4.2 Environmental Conditions ..................................................... 5-3
5.4.3
Warm-UD Period ............................................................ 5-3
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5.4.4
54.5
54.6
5.4.7
5.4.8
5.4.9
5.4.10
5.5
5.6
5.6.1
5.6.2
5.6.3
5.6.4
5.6.5
5.7
5.8
CALIBRATION Switch.. .................................................................................................................................
DC Voltage Calibration From Front Panel.. ..................................................................................................
AC Voltage Calibration From Front Panel.. ..................................................................................................
Resistance Calibration From Front Panel ....................................................................................................
Frequency Compensation ..............................................................................................................................
Calibration Storage .........................................................................................................................................
IEEE-488 Bus Calibration ...............................................................................................................................
SPECIAL HANDLING OF STATIC SENSITIVE DEVICES.. ........................................................................
TROUBLESHOOTING .......................................................................................................................................
Recommended Test Equipment ....................................................................................................................
Self Diagnostic Program.. ...............................................................................................................................
Power Supply and Battery Pack (Model 1758) Checks.. ............................................................................
A/D Converter and Display ..........................................................................................................................
Signal Conditioning.. ......................................................................................................................................
MODEL 1758 BATTERY PACK INSTALLATION AND REMOVAL ..........................................................
BATTERY PACK STORAGE.. ............................................................................................................................
5-3
5-3
5-4
54
5-5
5-5
5-5
5-6
S-6
S-6
5-7
5-11
5-11
5-11
5-13
5-13
SECTION 6 - Replaceable Parts
6.1 INTRODUCTION ............................................................................................................................................... 6-l
6.2 PARTS LIST.. ........................................................................................................................................................ 6-l
6.3 ORDERING INFORMATION ........................................................................................................................... 6-l
6.4 FACTORY SERVICE ........................................................................................................................................... 6-l
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List of Illustrations
SECTION 2
-
Bench
Operation
Figure 2-I
Figure Z-2
Figure 2-3
Figure 2-4
Figure 2-5
Figure 2-6
Model 175-AV Front Panel ..................................
dc Voltage Measurements ...................................
ac Voltage Measurements ...................................
ResistanceMeasurements.. . . ...............................
CurrentMeasurements .....................................
Model 1%AV Typical acV Frequency Response ..................
SECTION 4 - Principles of Operation
Figure 41 SimplifiedBlodcDiagram ........................................
Figure 42 Simplified Schematic of the Multiplexer .............................
Figure 43 Simplified Schematic of the Input Buffer Amplifier .....................
Figure 44 Simplified Schematic of the A/D Converter ..........................
Figure 45 Resistance Measurements - Ratiometric Technique ....................
Figure 46 Simplified Schematics of Ohms Circuitry. ............................
SECTION 5 - Maintenance
Figure 5-1
Figure 5-2 Model 175-AV Rear Panel ................
Segment Identification ..................
SECTION 6 - Replaceable Parts
Figure 6-l
Figure 62
Figure 6-3
Figure 6-4
Figure W
Figure 6-6
Figure 67
Figure 6-8
Figure 69
Figure 6-10
Figure 611
Figure 6-12
Model 175-AV/I758 ....................
Model 175-AV Final Assembly ............
Front Panel Assembly ...................
Connector Assembly ....................
Mother Board Component Layout (sheet 1 of 2)
Mother Board Component Layout (sheet 2 of 2)
Mother Board Schematic (sheet 1 of 2) .......
Mother Board Schematic (sheet 2 of 2) .......
Display Board Subassembly ..............
Display Board Schematic ................
Model 1758 Battery Option ...............
Battery Option Component Layout .........
Battery Option Schematic ................
Battery Assembly ......................
.
. . .
.
. . .
.
. . .
. .
. .
. .
. .
. .
. . .
. . .
. .
. .
. ...................... 6-3
. ...................... 65
. ...................... 6-7
. ...................... 6-9
...................... 6-15
...................... 6-17
. ...................... 6-19
. ...................... 6-21
...................... 6-25
...................... 6-27
. . ...................... 6-29
. . ...................... 6-33
. ....................... 6-35
. . ....................... 6-37
2-2
2-6
2-7
2-7
2-8
2-15
41
42
42
4-3
4-4
4-5
...................... 5-1
...................... 5-7
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List of Tables
SECTION 2 - Bench Operation
Table 2-1
EmrMsaagas ...................................
Table 2-2 Model 17~AV Maximum Allowable Inputs .............
Table 2-3 dB Spedfications for dc Volts (6CGRR4. ...............
Table 24 dBSpecificationsforacVolts~MxIRRef) ................
Table 2-5 Lewis for Other Reference Jmpedances .................
Table 2-6 Average Responding Meter Readings for Various Waveforms
SECTION 3 - Performance Verification
Table %l Recommended Test Equipment ....................... ..............
Table 3-2 Limits for dc Voltage Veriiication ..................... ..............
Table 3-3 Limit5 for ac Voltage Verification ..................... ..............
Table 34 Limits for Resistance Verification ..................... ..............
Table %5 Limits for dc Cummt Verification ..................... ..............
SECTION 5 - Maintenance
Table 5-1
Table 5-2
Table 5-3
Table 5-4
Table 5-5
Table 5-6
TabkS-7
Table 5-8
Table 59
Table 5-10
Table 5-11
PoseReplacements.. .............................. ..............
Recommended Calibration Equipment ................. ..............
dc Voltage calibration ............................. ..............
ac Voltage Calibration .............................. ..............
Resistance Calibration .............................. ..............
Recommended Troubleshooting Equipment ............. ..............
Squdial Display Test Steps ........................ ..............
Troubleshooting Modes ............................ ..............
Power Supply Checks and Battery Pack (Model 1758) Checks ..............
A/D Converter Checks ............................. ..............
Display Board Ch& .............................. ..............
SECTION 6 - Replaceable Parts
Table 6-l MotherBoard,PartsList ............................ ..............
Table 6-2 DispkiyBoard,PartsList ............................ ..............
Table 6-3 BatteryOptionBoard,Parte.List ...................... ..............
Table 6-4 Model175AVSpareParlsList ....................... ..............
..............
...............
..............
..............
2-4
2-5
2-8
2-8
2-9
2-13
3-2
3-2
3-2
3-3
3-3
5-2
5-3
5-4
54
5-5
5-7
5-8
5-9
5-11
5-12
5-12
6-11
6-23
6-31
6-39
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SECTION 1
General Information
1.l INTRODUCTION
The Keithley Model 175AV is a 4-l/2 digit LCD bench/
po~abledigitalmultimeter.TheModel175-AVcanmake
the following basic measurements:
1. DC voltage measurements from 1OpV to 1M)OV.
2. Resistance measurements from 1OmD to 2OOMQ.
3. AC voltage measurements from 1OuV to 750V.
4. DC current measurements from lOm4 to 2A.
5. AC current measumments from 101~4 to 2A.
In addition to the above mentioned measurement capa-
bilities, the Model 175-AV can make dcand ac dB voltage
measurements.
1.2 FEATURES
Some important Model 175-AV features include:
. 4-l /2 digit LCD display
. Fast autoranging
l
Bench or portable
l
Digital calibration
. lC0-point data logger
. 0.03% basic dcV accuracy
l
Average responding acV and acA
l
dBm/Relative functions
. Min/Max reading hold
. Safety input jacks
l
1OOkHz specified ac bandwidth
Options in&de:
. Model 1758 Rechargeable Battery Pack
. Model 1753AV IEEE488 Interface
1.3 WARRANTY INFORMATION
Warranty information may be found on the inside front
cover of this manuaL Should it be necessary to exercise
the warranty, contact your Keithley representative or the
factory to determinetheproper course of action. Keithley
Jnshuments maintains service facilities in the United
States, United Kingdom, and throughout Europe. Infor-
mation concerning the application, operation, or service
of your instrument may be directed to the applications
engineer at any of these locations. Check the inside front
cover for addresses.
1.4 MANUAL ADDENDA
Information concerning improvements or changes to the
instrument that occur after the printing of this manual
will be found on an addendum sheet included with the
manual. Be sure to review these changes before attempt-
ing to operate or service the instrument.
1.5 SAFETY SYMBOLS AND TERMS
The following safety symbols and terms are used in this
mamtal or found on the Model 175-AV.
Then symbol on the insttument denotes that the user
should refer to the operating instructions in this manual.
The t on the instrument denotes that ahazardous poten-
tial may be present on the terminal(s). Standard safety
practices should be observed when such dangerous lev-
els are encountered.
The WARNUUG used in this manual explains dangers
that could result in personal injury or death.
The CAUTION used in this manual explains hazards
that could damage the instrument.
l-l
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Table of contents
