Keithley 247 User manual

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Model 247
High Voltage Supply
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 1year from date of
shipment.
Keithley Instruments, 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 origi-
nal warranty period, or at 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 or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or
problems 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 PROVIDED HEREIN ARE
BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDI-
RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND
SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF
SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL
AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.
Test Instrumentation Group, Keithley Instruments, Inc. l 28775 Aurora Road l Cleveland,Ohio 44139 l [phone] *Fax: [phone]
CHINA: Keithley Instruments, Inc. *Holiday InnLido l Office Building 4&4Cl Beijing, China, ICOO l 8610-436-2871/2860 l 8610-436-2871
FRANCE: Keithley Instruments SARL *3All&edes Gamys l B.P.60 l 91122 PalaiseauC&dex*01-60-11-51-55~ Fax: 01-60-H-77-26
GERMANY. Keithley Instruments GmbH l Landsberge.rStr.65.82110 Gennering 0089-849307-O l Fax: [phone]
GREAT BRITAINz Keitbley Instruments, Ltd. l The Minsterl 58 PortmanRoad l Reading, Be&shire RG30 IEA l 01734-575666 l Fax: [phone]
ITALY: Keithley Instruments SRL l Vialc S. Gimignano 38 l 20146 hfilano. 02-48303008 l Fax: [phone]
JAPAN: Keithley Instruments Far East KK l Sumiyoshi 24 Bldg., Room 201 l 2-24-2 Sumiyoshi-cho *Naka-ku, Yokohama 231 l 81-45-201-2246 l Fax: [phone]
NE-S: Keithley Instruments BV. Awlingen West49 l 4202 MS Gorinchem . Postbus559 l 4200 AN Gorinchem l 01830-35333 *Fax: [phone]
SWlTZERUNDz Keithley Instruments SA* Kriesbachstrasse4 l 8600 Diibendorf *01-821-9444 l Fax: [phone]
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Model 247 High Voltage Supply
Instruction Manual
Q 1990, Keithley Instruments, Inc.
Test Instrumentation Group
All rights reserved.
Cleveland, Ohio, U.S.A.
December 1992, Sixth Printing
Document Number: 31834 Rev. F
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AUKeithIey product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand and product names are trademarks or registered trademarks of their respective holders.
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SAFETY PRECAUTIONS
The following safety precautions should be observed before using Model 247 High Voltage Supply.
The Model 247 High Voltage Supply 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 instruction manual carefully before
using the instrument.
Exercise extreme caution when a shock hazard is present. Lethal voltages may be present on the test fixture or the supply
output connector. The American National Standards Jnstitute (ANSI) states the a shock hazard exists when voltage lev-
els greater than3OV RMS or 42.4V peak are present. A good safety practice is to expect that hazardous voltage is present
in any unknown circuit before measuring.
Inspect the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.
For maximum safety, do not touch the voltage supply, test fixture, test cables or any other insfnunents while power is
applied to the circuit under test. Turn off all power and discharge any capacitorsbefore connecting or disconnecting
cables or jumpers.
Do not touch any object which 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.
Instrumentation and accessories should not be connected to humans.
The L symbol on a Model 247 indicates that 1OOOVor more may be present on the terminals. Refer to the Model 247
Instruction Manual.
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Model 247
High Voltage Power Supply
OUTPUT:
Voltage: 0 to 3kV DC
Currentz6mA DC maximum.
Polarity: Positive or negative with respect to chassis.
ACCUI&4CY: (W-28°C): f (0.25% of setting t 1.5V DC) from 1% to 100% of maximum
output voltage.
RESOLUTION: Dial graduations of 200mV.
STABILITY: &O.Ol%of setting/hr.; fo.OZ%of setting/bhrs., at constant temperatureafter
r+hour warm-up.
TEMPEIUTURE COEFFICIENT (W’-18°C& 28”-50°C):sOppm/“C
LINE REGULATIONz 0.001% voltage change for 10%line variation.
LOAD REGULATION: 0.005% voltage change from no load to full load.
RIPPLEANDNOISE:3.5mVrms,lOmVp-p@3kV,6mA;lmV~,3mVp-p@lkV,lmA,
lOHz-1OOkHz
SE’ITLING TIME: 4 seconds to within 1V with full resistive load.
OVERLOAD PROTECTIONr Short circuit proof, arc protected, self restoring.
METER Monitors voltage output.
ENVIRONMENT:
Operating: 0’ to 50°C, 0 to 80% relative humidity up to 35°C
Storage: -40° to 75°C
CONNECTORz Rear panel, MI-IVType LJG931/U.
POWER: 90-125V/180-25OV,50-6OHz,13OVA.
DIMENSIONS,WEIG~:483mmwidex89mmhighx273~deep(l9inx3~/~in.x103/4
in.), excluding handles. Four holes spaced forrack mounting. Net weight5.9kg (13Ibs.).
ACCESSORIES SUPPLIEIX Instruction manual,UG932/U mating connector, mounting
feet for bench operation.
Specifications subject to change without notice.
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Table of Contents
SECTION 1 - General Information
1.1 PURPOSEOFEQUIPMENT .................................................... ..I- 1
1.2 DESCRIPTION ................................................................ l-l
1.3 SPECIFICATIONS ............................................................. l-l
1.4 sAFETYsYMEioLsANDTERMs.. ................................................ l- 1
1.5 W~INFoRMATION....................................................l- 2
SECTION 2 - Operation
2.1 INSTALLATION .............................................................. 2-l
2.2 FRONTl?ANELCONTROLSANDTERMlNALS .................................... ..2- 1
2.3 REAR PANEL CONNECTORS AND TERMINALS ..................................... 2-2
2.4 l?REPAlK!JONFORUSE ..................................................... ..2- 3
2.5 INPUTPOWER ............................................................... 2-3
2.6 CURRENTLIMITING ........................................................ ..2- 3
27 HIGH VOLTAGE OUTPUT ...................................................... 2-3
2.8 APPLICATIONS ............................................................... 2-4
2.8.1 Application of 247 wit& Photomultipliers .......................................... 2-4
2.8.2 Application of 247 to Resisfivify Measurements ...................................... 2-4
2.8.3 Application of 247 with Ionization Chambers ....................................... 2-4
SECTION 3 - Theory of Operation
3.1 FUNCTIONALDESCRTMTON .................................................... 3-l
3.2 CIRCUtTDESCIUI’TION ...................................................... ..3- 1
SECTION 4 - Maintenance
4.1 INTRODUcTloN .............................................................. 4-l
4.2 RECOMMENDED TEST EQUIPMENT .............................................. 4-l
4.3 PREPARATION FORMEAS UREMENTS ............................................ 4-2
4.4 CALIBRATION ADJUSTMENTS .................................................. 4-2
4.5 PERFORMANCETESTS ......................................................... 4-2
4.6 TROUJ3LESHOOTlNG PROCEDURE .. f. ........................................... 4-3
SECTION 5 - Replaceable Parts
5.1 INTRODUCTION .............................................................. 5-l
5.2 ORDERINGINFORMATION ..................................................... 5-l
5.3 FACTORYSERVICE............................................................5- 1
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List of Tables
SECTION 4 - Maintenance
Table 41 Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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List of Illustrations
SECTION 2 - Operation
Figure 2-1 Model 247 Front Panel ..................................................... 2-2
Figure 2-2 Mode1247RearPanel ...................................................... 2-2
Figure 2-3 Connector and Cable Assembly .............................................. 2-4
Figure 2-4 PhotomultiplierCircuit...................................- ................. 2-4
Figure 2-5 Resistivity Measurement .................................................... 2-4
Figure 2-6 Ionization Chamber Circuit .................................................. 24
SECTION 3 - Theory of Operation
Figure 3-l High Voltage Power Supply Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-l
SECTION 4 - Maintenance
Figure 41 Model 247 Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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