Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 174 28263B(Model174)
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download 28263B(Model174) documenatation <<
Text preview - extract from the document
INSTRUCTION MANUAL
MODEL 174
DIGITAL MULTIMETER
COPYRIGHT, 1977, KEITHLEY INSTRUMENTS, INC.
THIRD PRINTING, AUGUST, 1980, CLEVELAND, OHIO, U.S.A.
DOCUMENTNO. 28263, REV. 8
INSTRUCTION MANUAL
Digital Multlmeter
Model 174
CONTENTS
kction Page
:ONTENTS.
LLUSTRATlbNs : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : i;i
iPECIFICATIONS. .................................. iv
. GENERAL INFORMATION .............................. l-l
I-1. INTRODUCTION. .............................. I'-1
l-2. FEATURES. l-l
l-3. WARRANTY INF6RMA;I6N: : : : : : : : : : : : : : : : : : : : : : : : : : : l-l
l-4. CHANGE NOTICE .............................. l-1
.. INITIAL PREPARATION .............. ..... 2-1
2-l. GENERAL ................. : : : : : : : ........... 2-l
2-2. INSPECTION. .. .............................................. 2-l
2-3. PREPARl iTION FOR USE ,: : : : : 2-l
o--- .- .._ .
i. FtKAIlNti INSTRUCTIONS. ............................ 3-l
3-l. G~iENERAL .................... 3-l
3-2. HOW TO SELEC- --T POWER. .......................... 3-1
3-3. HOW TO SELECT FUNCTION. ......................... 3-3
3-4. HOW TO SELECT RANGE ........................... 3-5
3-5. HOW TO MEASURE VOLTAGE. ........ 3-6
3-6. HOW TO MEASURE RESISTANCE ....... : : : : : : : : : : : : : : : : : 3-8
3-J. HOW TO MEASURE CURRENT. . . . 3-9
3-8. FURTHER MEASUREMENT CONSIDERATiOk: : : : : : : : : : : : : : : : : : . . 3-g
.. ACCESSORIES .................................. 4-l
4-l. G,ENERAL .-z, ................................
,^__.
4-2. MuutL I/ZU KECHAKG---~~---EABLE BATTERY PACK. ................. . 2
4-3. MODEL II722 DIGITAL INTERFACE. ...................... 4-6
4-4. RACK MC XJNTING 4-21
4-5. PROBES AND SHUNTi : : : : : : : : : : : : : : : : : : : : : : : : : : : : 4-23
4-6. CONVENIENCE CABLES AND CONNECTORS .................... 4-24
4-7. LOW-THERMAL CABLES. . 4-24
MODEL 1727 DIGITAL OUThi cAeLE iE+ ' ' ' ' : : : : : : . * * * ' ' ' ' : 4-24
;I,": MODEL 1743 MAINTENANCE KIT. .... : : : : ...... : : : : : : : : . 4-26
4-10. MODEL 1723 IEEE INTERFACE ........................ 4-25
!
ii AA
INSTRUCTION MANUAL
Dlgllel Mulllmeler
Model 174
CONTENTS (Cont'd)
#ection Page
15 . THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . 5-l
5-l. GENERAL.........................::::::::5-,
5-2. SIGNALFLOW............................... 5-l
5-3. SWITCHING (Schematic 27935E). . . . . . . . . . . . . . . 5-2
5-4. NANOVOLT PREAMP (Schematic 279370 E block diagram, Figur; i2.j : : : : : . 5-4
MODEL 1740 AC OPTION (Schematic 279440) . 5-5
MODEL 1744 OHMS OPTION (Schematic 27941Cj : : : : : : : : : : 1 : : : : . 5-8
MODEL 1745 AMMETER OPTION (Schematic 2794OC). . . 5-12
5-8. ANALOG-TO-DIGITAL CONVERTER (Schematic 2J936F). : : : : : : : : : : : : , 5-12
5-9. DISPLAY BOARD (Schematic 279391)). . . 5-21
5-10. DIGITAL BOARD (Schematic 28209E). . : : : : : : : : : : : : : : 1 : : : . 5-23
5-l I. POWER SUPPLY (Schematic 279380) . . . . . . . . . . . . 5-25
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . : : : : : : : : : 6-1
' 6-1. GENERAL.................................6-I
6-2. REQUIRED TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . , . . . 6-1
6-3. PERFORMANCE VERIFICATION . . . . , , . . . . . . . . . . . . . , . . , . 6-1
6-4. ADJUSTMENT/CALIBRATION PROCEDURE . . . . . . . . . . . . . , . . . . . . 6-g
6-5. TROUBLESHOOTING. . . . . . . . . . . . . . . . . . , . . . . . . . . . . 6-21
7 REPLACEABLE PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-l
* J-l. GENERAL...... . . . . . . . . . . . . . . . . . . . . . . . . ...7-I
7-2. ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 7-l
7-3. SCHEMATICS . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-l
i
AA ii;
INSTRUCTION MANUAL
Dlgital Multlmeter
Model174
ILLUSTRATIONS
igure No. Title Page
I Dimensional Data ........................... v
2 Rear Panel Connections ........................ 1-2
View of Chassis With Cover Removed . . 1-4
T, Installation of Models 1740, 1744, 1745: : : : : : : : : : : : : : : : 2-3
Typical Display For Non-Valid Function ................ 3-2
65 Front Panel Controls and Input Terminals ............... 3-4
Manual Ranging on the Model 174. ................... 3-5
ii Model 1728 Rechargeable Battery Pack ................. 4-3
9 Installation of Model 1728 ...................... 4-4
IO Installation of Model 1722 Digital Interface ............. 4-7
Ila Connector Pin Identification For Model 174/1722. ........... 4-9
lib Connector Pin Identification For Model 174/1722. ........... 4- I(
Installation of Model 1722 Digital Interface ............. 4- 11
6 Location of Jumpers t Pull-Ups For Model 1722. ............ 4-l:
14 Model 1722 Block Diagram ....................... 4-I(
15 Model 1007 Dual Rack Mounting Kit. .................. 4- 2C
16 Model 2000 Rack Mounting Kit ..................... 4-2;
17 Model 1746A Low-Thermal Shorting Plug ................. 4-Z:
18 Model 1747A Low-Thermal Cable Set ................... 4-Z!
I9 Model 1743 Maintenance Kit ...................... 4-2;
20 Typical Installation of Extender Card on Model 1722. ......... 4-2t
21 Diagram of Signal Flow ........................ 5-l
22 Simplified Diagram of Nanovolt Preamp. ................ 5-4
23 Diagram of AC Attenator (Model 1740) ................. 5-5
24 Diagram of AC/DC Converter (Model 1740). ............... 5-7
Simplified Diagram of Model 1744 Ohms Option ............. 5-9
2 Detailed Diagram of Model 1744 Ohms Option .............. 5-IC
27 Basic Functional Blocks of A/O Converter ............... 5-1:
28 Basic Charge Balance Converter .................... 5-IL
Operating Waveforms of A/D Converter ................. 5-11
:: Simplified Schematic ......................... 5-1;
Simplified Diagram of Complete A/O Converter ............. 5-2C
:: A/O Converter System Timing. ..................... 5-21
Digital Display Multiplex Scheme ................... 5- 2i
;t Test Circuit For 30 mV DC Accuracy Check ............... 6-3
35 Test Circuit For 3uA Verification. .................. 6-7
36 Model I74 Top View With Cover Removed. ................ 6-1~
37 Model I74 Calibration Adjustments. .................. 6-11
38 Waveform For A/D Calibration ..................... 6-11
Model I74 Chassis Assembly ...................... 6-25
2'0 Model I74 Bottom Cover Assembly. 6-21
41 Component Layout, PC-412 (Part I). ....................... : : 1 : : : : 7-53
Component Layout, PC-412 (Part 2). .................. 7-54
:: Component Layout, PC-421 ....................... 7-57
Component Layout, PC-410 ....................... 7-58
2: Component Layout, PC-414 ....................... 7-59
Component Layout, PC-408 ....................... 7-60
:; Component Layout, ~~-409 ....................... 7-61
48 Componen r. Layout, Model 1728 ..................... 7-62
49 Component Layout, Model 1722, Upper Board (PC-415) . * * . . * . + ' ' 7-67
50 Component Layout, Model 1722, Lower Board (PC-416) * * * * . * * ' ' * J-65
iv BB
INSTRUCTION MANUAL
Dlgital MullimeIer
Model 174
SPECIFICATIONS
AS AN AUTOJMANUAL RANGINQ DC VOLTMETER
WITI AUTO/MANUAL RANGING AC VOLTAGE OPTION ,740 ASANACAMMSTER WlTHOPTlONSl740ANO~7~5
vi AA
INSTRUCTION MANUAL
DigItat MultImeter
Model 174
8.5" (217mm)
t
I
FIGURE I. Dimensional Data.
INSTRUCTION MANUAL GENERAL INFORMATION
DigItal MultImeter
Model 174
SECTION I. GENERAL INFORMATION
l-l. INTRODUCTION. The Model 174 Digital Multimeter is a wide-range, general purpose
measuring instrument, capable of measuring ac/dc voltage, ac/dc current, and resistance.
l-2. FEATURES.
a. Standard
I. Sensitivity to 0.1 microvolt dc.
2. 30000 count display for high resolution.
0.013% basic dc accuracy
t : Manual, automatic or remote ranging.
5. Lo to CASE isolation to 10'0.
b. Optional.
1. Model 1728 Rechargeable Battery Pack.
Model 1722 Digital Interface.
;: Model 1723 IEEE Iriterface.
Model 1740 AC Option.
5: Model 1744 Ohmmeter Option.
6. Model 1745 Ammeter Option.
l-3. WARRANTY INFORMATION. The warranty is stated on the inside front cover of the
manua I . If there is a need for service, contact your Keithley representative or author-
ized repair facility as given on the inside front cover of this manual.
l-4. CHANGE NOTICE. Improvements or changes to the instrument not incorporated into
the manual will be explained on a change notice sheet attached to the inside back cover
of the manual.
IMPORTANT
The A symbol can be found in various places in this Instruction Manual. Care-
fully read the associated CAUTION statements with regard to proper use and hand-
ling of the instrument. Damage to the instrument may occur if these precautions
are ignored.
The\ symbol can be found in various places in the Instruction Manual. This
symbol indicates those areas on the instrument which are potential shock hazards.
Carefully read the associated WARNING statements with regard to proper use and
handling of the instrument. Serious personal injury may result if these pre-
cautions are ignored.
1-l
AA
GENERAL INFORMATION INSTRUCTION MANUAL
Digital Multimeter
Model 174
3mV DC,
REMOVE TOP COVER 30mV DC, CONNECTION TO
'HILLIPS TO GAIN ACCESS ANALOG MODEL 1722 OR PHILLIPS
iCREWS TO CHASSIS (4 SCREWS) OUTPUT 1723 INTERFACE SCREWS
LINE LiNE
FUSE INPUT
F401 P405
FIGURE 2. Rear Panel Connections.
l-2 AA
INSTRUCTION MANUAL GENERAL INFORMATION
Dlgltat MultImeter
Model 174
TABLE I-l
Summary of Options and Accessories
ptions: Remarks:
Model 1740 AC Option Factory or Field-Installed. To field-
install, refer to Section 2, paragrap" 2-3~
Model 1744 Ohmmeter Option Factory or Field-Installed. To field-
install, refer to Section 2, paragraph Z-3d
Model 1745 Ammeter Option Factory or Field-Installed. To field-
install, refer to Section 2, paragraph 2-3e
upplied Accessories:
Model 1746~ Low-Thermal Short See ACCESSORIES, Section 4, paragraph 4-7a.
mther Accessories:
Model 1600 High Voltage Probe See ACCESSORIES, Section 4, paragraph 4-5a.
Model 1651 50-Ampere Shunt See ACCESSORIES, Section 4, paragraph 4-5b.
Model 1682 RF Probe See ACCESSORIES, Section 4, paragraph 4-5~.
Model 1685 Clamp-On AC Current Probe See ACCESSORIES, Section 4, paragraph 4-jd.
Model 1722 Digital Interface See ACCESSORIES, Section 4, paragraph 4-3.
Model 1723 IEEE Interface Described in separate Instruction Manual.
Model 1727 Digital Interface Cable Set See ACCESSORIES, Section 4, paragraph 4-8.
Model 1728 Rechargeable Battery Pack See ACCESSORIES, Section 4, paragraph 4-2.
Model 1743 Maintenance Kit See ACCESSORIES, Section 4, paragraph 4-9.
Modell747A Low-Thermal Input Leads See ACCESSORIES, Section 4, paragraph 4-7b.
BB l-3
INSTRUCTION MANUAL
GENERAL INFORMATION Digital Multimeter
Model 174
LINE
SWITC :HES -
-MOUNTING
BRACKET
SHIELD FOR
'NANOVOLT
PREAMP
MODEL 1740
VIOLET WIRE
,TO MODEL
1740
MODEL 1744
MODEL 1745 -FUSE
FIOOI
FIGURE 3. View of Chassis With Cover Removed.
l-4 AA
INSTRUCTION MANUAL INITIAL PREPARATION
Dlgltal Multlmeter
Model 174
SECTION 2. INITIAL PREPARATION.
2-l. GENERAL. This section provides information needed for incoming inspection and
preparation for use.
2-2. INSPECTION. The Model 174 was carefully inspected both mechanically and electricai-
ly before shipment. Upon receiving the instrument, check for any obvious damages which
may have occurred during transit. Report any damages to the shipping agent. To verify
the electrical specifications, follow the procedures given in Section 6.
2-3. PREPARATION FOR USE. The Model 174 may require soie preparation before placing the
instrument in use, depending on the field-installable options or accessories to be used.
For line operation the Line Voltage switches and Line Fuse should be checked to verify
correct settings or value for the line power voltage to be used. If any one of accessory
Models 1722, 1723, or 1728 are to be field-installed, the top cover will need to be removed.
See ACCESSORIES, Section 4 in this manual. If any of the Models 1740, 1744, 1745 Options
are to be field-installed, the top cover must be removed and the installation procedures
in following paragraphs c, d, and e must be used.
a. How to Set the Internal Line Voltage Switches (S4Ol and 5402). The Model 174
has two slide switches located on the main circuit board as shown in Figure 3. The
top cover must be removed to gain access to the circuit board as shown in Figure 2.
WARNING
Disconnect the line cord before removing the top cover of the instrument. Line
voltage is present at various points on the circuit board and represents a SHOCK
HAZARD.
TABLE 2-l.
Summary of Line Voltage Settings
b. Line Fuse Requirement. The Model 174 uses a single line fuse to protect the
line-operated power supply. The fuse is a 3 AE, slow-blow type. Verify that the
fuse rating is 1/2A for 90-125V range, l/4A for IgO-250V range. The line fuse is
located on the rear panel as shown in Figure 2.
2-l
INITIAL PREPARATION INSTRUCTION MANUAL
Digital MultImeter
Model 174
C. How to Install the Model 1740 AC VOLTS Option. Cut the tie wrap holding the "violet"
wire. Connect the "violet" input lead (P301) coming from the Function Switch to Jl203.
Install the plug-in board for the Model 1740 on the Model 174 chassis at PSOI and P502
as shown in Figure 4. The plug-in board (PC-414) edges should mate with the teflon card
edge guides which support the board. The component side of PC-414 faces the front of the
instrument.
IMPORTANT
The AC VOLTS circuit must be calibrated prior to use as in Section 6-4e.
d. How to Install the Model 1744 OHMS Option. The plug-in board (PC-408) for the Model
1744 is installed on the Model I74 chassis at P503 as shown in Figure 4. The component
side of ~~-408 faces the front of the Instrument.
IMPORTANT
The entire 174 Calibration Procedure must be performed prior to use as in Section 6-4.
e. How to Install the Model 1745 AMPERES Option. The plug-in board (PC-409) for the
Model 1745 is installed on the Model I74 chassis at P504 and P505 as shown in Figure 4.
The component side of PC-409 faces the front of the instrument. Check fuse FIOOI for
proper rating and condition. Replacement fuse is a Keithley Part No. FU-39; 4 amperes
rating.
IMPORTANT
The AMPERES circuit must be calibrated prior to use as in Section 6-49.
2-2 AA
INSTRUCTION MANUAL INITIAL PREPARATION
Digital Mulllmeler
Model 174
FIGURE 4. Installation of Models 1740, 1744, 1745.
2-3
NITIAL PREPARATION INSTRUCTION MANUAL
Digital Multimeter
Model 174
TABLE 2-2.
Summary of Detailed 74 Max Rating at Input Terminals
FUNCTION HI TO LO MAXIMUM
DC VOLTS
300 mV - 1 KV 12OOV Peak
3 mV and 30 mV 250V RMS sine, <60Hz or 250~
Peak .
◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo