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Simplified schematic

Figure 2-2 shows a simplified schematic diagram of the Model 7999-4. The schematic is

arranged into four sections:

•

Power

•

RS-232 interface

•

Relay control

•

Relay

RS-232

Interface

Power

Relay

control

J1011

DB9

J1

0

0

3

J1010

3-Pin phoenix

jack

Power

LED

NO LED

NC LED

Relay

C

NO

NC

NC

COM

NO

SMA Connectors

Figure 2-2

Simplified
schematic

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Содержание 7999-4

Страница 1: ...Contains Operating and Servicing Information Model 7999 4 Microwave Switch Instruction Manual...

Страница 2: ...OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRU MENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN A...

Страница 3: ...Model 7999 4 SPDT Microwave RS 232 Switch Instruction Manual 1999 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing December 1999 Document Number 7999 4 901 01 Rev B...

Страница 4: ...o the manual Addenda are numbered sequentially When a new Revision is created allAddenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each n...

Страница 5: ...nt 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 responsibl...

Страница 6: ...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 shal...

Страница 7: ...quency 1GHz 4GHz 8GHz 12 4GHz 18GHz VSWR max 1 1 1 15 1 25 1 35 1 5 Insertion Loss dB max 0 2 0 2 0 3 0 4 0 5 Isolation dB min 85 80 70 65 60 GENERAL INTERFACE RS 232 control 9600 baud 8 data 1 stop R...

Страница 8: ...ections 1 4 2 Connections Introduction 2 2 Handling precautions 2 2 Configuration 2 2 Layout 2 2 Simplified schematic 2 4 Connections 2 5 RS 232 Connection 2 5 SMA connectors 2 6 Power connector 2 6 3...

Страница 9: ...nce verification 4 3 Environmental conditions 4 3 Recommended equipment 4 3 Channel resistance tests 4 3 Replacing components 4 5 Replacement parts 4 5 Replacement precautions 4 5 Soldering considerat...

Страница 10: ...eral layout 2 3 Figure 2 2 Simplified schematic 2 4 Figure 2 3 RS 232 interface connector 2 5 3 Operation Figure 3 1 Toggle relay state switch 3 2 Figure 3 2 Jumper location 3 4 4 Service Information...

Страница 11: ...Operation Table 3 1 Jumper positions termination characters 3 3 Table 3 2 Command set 3 5 4 Service Information Table 4 1 Recommended verification equipment 4 3 5 Replaceable Parts Table 5 1 Parts li...

Страница 12: ...1 GeneralInformation...

Страница 13: ...a single channel Microwave SPDT switch with the following features SMA connectors RS 232 relay control 12V DC power connections Operating range from DC to 18GHZ Warranty information Warranty informat...

Страница 14: ...mage the switch Such damage may invalidate the warranty Specifications Full Model 7999 4 specifications are included at the front of this manual Unpacking and inspection Inspection for damage The Mode...

Страница 15: ...hipment Should it become necessary to return the Model 7999 4 for repair carefully pack the unit in its original packing carton or the equivalent and include the following information Call the Repair...

Страница 16: ...2 Connections...

Страница 17: ...care should be taken when handling the switch to avoid contamination from such foreign materials as body oils Such contamination can reduce isolation resistance To avoid possible contamination Always...

Страница 18: ...Connections 2 3 NC COM NO J1003 CA 27 20D Cable Assembly RS 232 Port DB 9 connector Power Receptacle 3 pin phoenix Power LED SMA Connectors NC LED NO LED Figure 2 1 General layout...

Страница 19: ...m of the Model 7999 4 The schematic is arranged into four sections Power RS 232 interface Relay control Relay RS 232 Interface Power Relay control J1011 DB9 J1003 J1010 3 Pin phoenix jack Power LED NO...

Страница 20: ...tor If your computer uses a DB 25 connector for the RS 232 interface an additional cable or adapter DB 25 to DB 9 is required NOTE In the RS 232 interface only pins 2 3 and 5 are used Pins 7 and 8 are...

Страница 21: ...n and NC normally closed connections of the relay Power connector Connect the supplied power adapter Model PS 57A to the power connector WARNING To prevent damage to the Model 7999 4 use only the Keit...

Страница 22: ...3 Operation...

Страница 23: ...ceed the following maxi mum signal level specifications of the switch Maximum voltage 30V DC 42V peak Maximum current 1A DC switched Toggle relay state switch Use this switch to manually toggle the re...

Страница 24: ...rogram message transmitted to the controller with any of the following combinations of CR or LF CR Carriage return factory default setting CR LF Carriage return and line feed LF Line feed LF CR Line f...

Страница 25: ...3 4 Operation 1 1 Figure 3 2 Jumper location...

Страница 26: ...me has run out Close the relay C or c After the closed command is sent a 25msec delay occurs which allows the relay to settle After the relay settles an ASCII 1 is sent over the RS 232 indicating sett...

Страница 27: ...m The measurement is shown as ratio to 1 e g a VSWR of 1 2 is actually the ratio of 1 2 1 Refer to the specifications located at the front of this manual for Model 7999 4 VSWR information specificatio...

Страница 28: ...ts at high levels if the problem is of sufficient severity EMI can be caused by steady state sources such as radio or TV broadcast signals or some types of electronic equipment microprocessors high sp...

Страница 29: ...4 ServiceInformation...

Страница 30: ...ing precautions Observe the following precautions when handling the SPDT switch Handle the switch only by the edges and cover Do not touch connector insulators Do not touch any board surfaces or compo...

Страница 31: ...humidity of less than 70 Recommended equipment Table 4 1 summarizes the equipment necessary for performance verification channel resis tance tests Channel resistance tests Perform the following steps...

Страница 32: ...DMM 2010 MULTIMETER RANGE F 500V PEAK FRONT REAR 3A 250V AMPS HI LO INPUTS 350V PEAK 1000V PEAK SHIFT LOCAL POWER RANGE R SHIFT CH1 REM TALK LSTN SRQ STAT REL FILT 4W BUFFER MATH REAR SCAN TIMER STEP...

Страница 33: ...hen using solder on the circuit board observe the following precautions Use an OA based organic activated flux and take care not to spread the flux to other areas of the circuit board Remove the flux...

Страница 34: ...5 ReplaceableParts...

Страница 35: ...ordering parts be sure to include the following information Switch model number Model 7999 4 Serial number Part description Component designation if applicable Keithley part number Factory service If...

Страница 36: ...NG HEADER FRICTON SGL ROW CS 724 3 J1003 cable CABLE ASSEMBLY CA 27 20D J1006 J1009 CONN BERG CS 339 J1010 CONN HORIZ RECEPTACLE 3 PIN CS 943 3 J1011 CONN RT ANGLE MALE 9 PIN CS 761 9 Q101 TRANS NPN S...

Страница 37: ...art no Bracket relay 7999 4 304A Cover bottom 7999 4 302A Cover top 7999 4 301A Female screw lock CS 725 Lock nut 4 40KEPNUT Phillips Pan Head Screw 4 40X1 4PPH Phillips Pan Head Screw SEMS black 4 40...

Страница 38: ......

Страница 39: ...3 Line feed and carriage return 3 3 M Manual addenda 1 2 Maximum signal considerations 3 2 O Opening or closing the relay 3 5 Operation Introduction 3 2 RS 232 3 3 Ordering information 5 2 overview 1...

Страница 40: ...to zero Unstable Overload Will not read applied input Calibration only Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measure...

Страница 41: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...

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