Amplifier Research 200T1G3 User Manual
Contents
1. 3 4 3 225 Connections sese et exeun 3 5 3 2 6 External Interlock Connector 3 5 3 3 Front Panel seite bestes 3 6 3 4 Front Panel Display and Soft 3 7 3 5 Rear Panel Features 3 11 3 6 Initial Turn on and Warm up Procedure 3 12 3 7 Emergency Bypass Operation 3 13 3 8 Remote IEEE 488 Operation 3 14 3 9 TWTA General Considerations 3 19 Maintenance 4 1 Safety Warnings 4 1 4 2 Unauthorized Repatlrs 4 1 4 3 Preventive Maintenance 4 2 4 4 Troubleshooting 4 3 4 5 Non repairable Modules 4 4 Technical Documentation 5 1 Top Level Build n n u alee ke 5 2 2 2 SEAS aaa asa unpu un tied stands ta 5 3 3 2 Wiring 5 4 5 4 Parts Lists sasanqua qia 5 5 5 5 Recommended Spare Parts 5 18 5 6 Sample Program for IEEE 488 Communication2. 25 9 N Z m N u ee Y oS 6 T 25 5 Ax N N 5 1 N 5 OM 1 8 9 Figure 3 2 TWTA Front Panel Table 1 Front Panel Features to power supplies heater delay are cleared STANDBY Push button biases grid off and turns off high voltage 4 ADJUST Rotary knob used as an input device to change values of a variety of parameters Push button terminates various menu selection routines and returns to the previous menu level Md LEE Juss functions 11 Keylock Switch Allows operator to inhibit the TWTA to enable front jane conlrol or to 12 Emergency switch cover Provides access to emergency bypass switches which ME permit manual control of the amplifier 3 6 REV F Model 200 468 Manual Text 3 4 Front Panel Display and Soft Keys The purpose of the front panel display is to permit the operator to access extensive information about the condition and operation of the TWTA To accomplish this a number of informational screens are programmed It is important for the operator to be able to select the screen with the required information Screen selection is accomplished by pressing an appropriate soft key or by pressing the EXIT key When a soft key is active its function is displayed on the bottom line of the display Figure 3 3 provides a roadmap for navigating between the screens EXIT lt X
3. 5 19 iii Model 2007468 Manual Text TABLE OF CONTENTS Continued ILLUSTRATIONS Fig r 3 1 Rear View OD EDDA 3 3 Figure 3 2 TWTA Front Panel Features eese eee eene enne 3 6 Figure 3 3 Front Panel Display Screens 1 1 2 0 1 4 1 4 3 7 Figure 3 4 TWTA Rear Panel o eio od etu 3 11 TABLES Jable L Front Panel Pe atures edt de e adr bea ad decet 3 6 Table Rear Panel Beadlutes se 3 11 Table 3 Catalog of IEEE 488 Commands 3 14 Table 4 Catalog of Status Codes tet ede trs pies ehe eden take eae ee du 3 16 T ble 5 Catalog of Fault Codes 3 16 Table 6 Catalog of System State Codes 3 17 Table 7 Catalog of STA Response 3 17 Table 8 Catalog of STB Response Codes 3 18 Table 9 Catalog of Heater Auto Off Time Delay Codes 3 18 Model 200 468 Manual Text SECTION I DESCRIPTION AND SPECIFICATIONS This manual provides operating interfacing and selected service information pertinent to Amplifier Research Model 200T4G8 Broadband Microwave Amplifier The Model 200T4G8 is a 200 watt C ban
4. E00888 015 FLEX 15 SMA MALE TO MALE 20 GHZ 50 0 141 1 CABLE INSULATED JACKET SRC 150 150 150150 E01198 000 55 C BAND 4 0 8 0 GHZ 10 DBM 15 DB MIN GAIN 35 DB 1 GAIN CONTROL KMIC CMA 4080 A E20012 000 ATTENUATOR 6DB SMA 2W MIDISCO MDC8065 6 2 E20014 000 ATTENUATOR 14DB SMA 2W MIDISCO MDC8065 14 1 E20066 000 ATTENUATOR 10DB 2W DC 18GHZ OMNI SPECTRA 1 2082 6147 10 E20101 000 CABLE ASSY FLEX COAXIAL 0 410 OD 22 PLUGS STORM 1 90 078 022 E20130 000 5 MALE TO SMA FEMALE RIGHT ANGLE CDI 2 5490CCSF PASTERNACK 9262 E20155 000 DUAL COUPLER HIGH POWER 4 8 GHZ 30DB MAC TECH 1 C1105B 3 E20158 000 2 WAY DIVIDER 4 8 GHZ MAC TECH P8205 2 1 E20284 000 ZERO BIAS SCHOTTKY DETECTOR 10MHZ 18 5GHZ POSITIVE 2 OUT PUT POLARITY KRYTAR 301 AP E30069 000 TWT 4 0 8 0 GHZ 250W CW MIN TWT M5889NO 1 J17240 000 5 FEMALE TO TYPE MALE PASTERNACK 1 PE9081 J17264 000 FEMALE TO SMA FEMALE PANEL MOUNT 2 MA COM 3680 2242 00 J18160 000 1 PIN FEMALE 20KV 10A 0 180 DIA 5 LEAD CONNECTRONICS 11039 02 S26026 000 2 POLE 15A AIRPAX IEGH 66 1 61 15 0 C 21 1 5 12 REV F Model 200 468 Manual Text PARTS LIST INTERFACE BOARD PLASTIC A25444 000 REF DESIG ETM P N DESCRIPTION QUANTITY B25444 000 HPA INTERFACE BOARD 1 C161 C03105 000 CAP 0 01MF 100V CER 10 RADIAL AVX SR201C103KAA 1 C171 04
5. N CAUTION For either bench or rack mounting do not position the TWTA in such a way that the air intake or outlet are blocked or that the exhaust flow is directed into the intake See Paragraph 3 5 for location of air intake and air outlet If the unit is rack mounted make sure that the intake air is 45 C or below If necessary fabricate a short duct to direct the hot exhaust air out of the rack enclosure Great care must be taken to minimize any exhaust air restrictions Avoid mounting heat producing equipment in the same rack especially below the TWTA Failure to provide adequate cooling can result in the unit shutting down from over temperature conditions The TWTA dissipates approximately 1 5 kilowatts when in the operate mode 3 2 4 AC Line Power Connections AC line power connection to the TWTA is made at the AC inlet J1 which is a female IEC 320 16A connector The connector is provided with a bracket that can be used to secure the plug from accidental withdrawal A line cord suitable for the type of AC outlet used and consistent with local electrical codes must be obtained to mate with J1 Minimum wire size recommended for the line cord is 1 5 mm 16 AWG Units are provided with an unterminated 3 wire cord To use this line cord it should be terminated with a suitable plug to a 190 to 260 VAC 50 60 Hz single phase source as follows Color Function International Harmonized North American Brown Black Line Blue White Neutral Y
6. Model 200 468 Manual Text 4 5 Non Repairable Modules The High Voltage Diode Cap Assembly A21425 090 the High Voltage Filter Assembly A21457 001 and the Heater Supply A10010 000 are encapsulated modules and are not repairable Contact an authorized service representative if replacement modules are needed 4 4 REVF Model 200 468 Manual Text SECTION V TECHNICAL DOCUMENTATION Note The purpose of this technical documentation section is to provide a guide to the TWTA for technician level servicing It is intended for use by qualified technical personnel who must troubleshoot and repair the TWTA in the field Such repairs are typically limited to replacement of modules or major components For this reason documentation pertaining to the highest levels of the system and to system control logic is included 5 1 REV F Model 2007468 Manual Text 5 1 Top Level Build Tree 1A1 1 1 1 1 1 2 1 1 1 1 4 1 1 414 1A1A5 1A1A5L1 1A1A5T1 E42 1A1A5T2 E41 1A1A6 1A1A6T1 1A1A7 1A1A8 1A1A8A1 1A1A8A1T1 1A1A8A1T2 1A1A8A2 1A1A9 1A1A9T1 1A1A9T2 1A1A11 1A1A12 1 2 1 1 1 1 2 1 4 1 4 2 1 4 1 5 1 6 1 8 1 9 1 10 28880 932 22520 090 24357 000 23687 001 16485 000 23683 000 09006 000 16487 001 09405 000 09402 000 09403 000 21425 090 09479 000 21457 001 10007 000 10008 000 09407 000 09228 000 1000
7. Eb Grid voltage Eg Cathode voltage Ek Helix current Tw Help Screens On each of the menu screens soft key S3 is labeled HELP If S3 is selected a message describing the functions of that screen will be displayed Use the ADJUST knob to scroll through the message The EXIT key will return you to the screen from which the help screen was called Setup Screens From MENU 2 51 labeled SETUP selects the first of several setup screens SETUP 1 This allows the user to manually shut off the heater power supply and put the HPA into Sleep Mode see below Pressing S1 SET toggles between ON and OFF Pressing MORE again brings up the SETUP 2 screen which allows the user to change the Auto Sleep Mode timer setting Pressing SET will change the timer options in half hour increments from 0 5 to 3 0 hours Pressing MORE again will save the timer setting and bring up the SETUP 3 screen which toggles the display of temperature parameters between Fahrenheit and Celsius degrees Pressing 51 SET changes the selection The setting displayed when the screen is exited will be retained Pressing MORE again brings up the SETUP 4 screen which allows a choice of displaying forward power or watts in dBm or in strip chart form Pressing MORE a third time brings up SETUP 5 which allows a choice of watts or dBm or of forward power for displaying reverse power MORE brings up SETUP 6 which allows entering the desired number of alarm beeps and the desir
8. 03 volts Units are usually not returned see table 3 for the units 3 18 REV F Model 200 468 Manual Text If remote is not enabled set commands and commands to the system logic 1 STANDBY or RESET will not be accepted It is recommended that the RDSTAT command be used to provide the host program with a report on how a command was processed A small sample program that can send commands and receive the strings returned by the TWTA is included in section 5 5 It is written in Hewlett Packard s Rocky Mountain BASIC The program assumes that the IEEE 488 bus is at address 7 and that the address of the TWTA is 01 Remote operation is determined by the application software program in the system controller This application program will aid the user in generating the Command Codes and displaying monitoring the Status Codes Consult the application program users instructions for Remote operation procedure The application program should issue only one string at a time After each functional command is issued the status should be checked to ensure that the command has been properly executed The application program should allow sufficient time for the function to be completed before checking the status The application program should facilitate checking the status just prior to issuing a command since the status could have been changed by a fault condition of the amplifier or by operator activation of the amp
9. 15V DIODES INC 1N965B 3 D1 D3 D4 D5 D7 D8 D14454 000 DIODE AXIAL MOTOROLA 1N4454 24 D9 D10 D11 D12 013 017 018 019 021 022 025 026 028 030 035 037 036 D14733 000 ZENER 5 1V 1W 10 AXIAL MOTOROLA 1N4733 1 F00010 000 WASHER 2 LOCK SST 3 F10086 000 2 56 X 3 16SST 3 J2 J10370 000 37 PIN MALE D SUB PCB RIGHT ANGLE 747252 4 1 J18075 000 MALE SCREW LOCK FOR D SUBMIN CONN AMP 205817 1 1 J4 J5 J18086 000 CONN SMA JACK RECEPTACLE RIGHT ANGLE 0 18GHZ PC 2 MOUNT JOHNSON COMPONENTS 142 0701 301 J1 N25003 000 HYPERTRONICS 29 PIN MALE RIGHT ANGLE CUT 1 Q2 Q22907 000 TRANSISTOR PNP 2N2907A TO 18 1 s R19 R37 R44 00100 000 5 10 OHM 1 4W 5 CC A B RCO7GF100J 6 R4 R20 R27 R29 R01100 000 RES 100 OHM 1 4W 5 CC A B RC07GF101J 4 R5 R17 R18 R28 02100 000 5 1 1 4 5 RC07GF102J 12 R34 R45 R49 R53 R54 R59 R71 R88 R6 02270 000 5 2 7 1 4 5 RC07GF272J 1 R30 R31 R36 R02470 000 5 4 7 1 4 5 RCO7GF472J 3 5 6 REV F Model 200T4G8 Manual Text PARTS LIST HPA LOGIC AND CONTROL MODULE A16485 000 REF DESIG ETM P N DESCRIPTION QUANTITY R86 R87 R02510 000 RES 5 1K 1 4W 5 CC A B RCO7GF512J 2 R75 R02560 000 X RES 5 6K 1 4W 596 CC A B RCO7GF562J 1 R38 R77 R90 R03100 000 RES 10K 1 4W 5 CC A B RCO7GF103J 3 R32 R03470 000 RES 47K 1 4W 5 CC A B RCO7GF473J 1 R35 R05820 000 RES 8 2M 1 4
10. MENU 4 MENU 1 GAIN HELP MORE Sem FF MORE spin M SETUP 4 in Forward Power reads Press SET to change SET MORE o SETUP 5 Reverse Power reads in watts Press SET to chang ET MORE Beeper Vol LOUD Alarm Beeps 3 MORE 2 SETUP 7 GPIB Address 1 L SET MORI m Figure 3 3 Front Panel Display Screens REV F Model 200 468 Manual Text Menu screens screens at the highest level are called menu screens There are four menu screens At power the MENU 1 screen is displayed Each of the menu screens has the soft key 54 labeled MORE The MORE key S4 causes the next menu screen to appear From MENU 4 MORE causes MENU 1 to reappear In short MORE permits scrolling through the menu screens EXIT key returns display to MENU 1 from any other menu screen The menu screens display system status and parameter levels They are configured as follows MENU 1 Forward power watts dBm or bar graph Reverse power watts dBm or forward power System status if a latched fault exists MENU 1 is displayed with the system shutdown message MENU 2 Console hours active when AC power is on Operate hours active when HV is on MENU 3 Cabinet temperature C or F TWT baseplate temperature or F MENU 4 Heater voltage Ef Heater current If Collector voltage
11. SHORTING THROW ILLINOIS 1 LOCK HD5161 AACCM 100 090 041G WITH KEY E100 U17501 000 IC DIGITAL AUTOPOT W RIBBON CABLE HP HEDS5701 F10 1 5 9 REV F Model 200 468 Manual Text PARTS LIST REMOTE CONTROL BOARD A24369 000 REF DESIG ETM P N DESCRIPTION QUANTITY REV B B24369 000 REMOTE CONTROL BOARD 1 C4 C6 C04105 000 0 1 100 20 C331C104M1R5CA 3 C7 C05223 000 CAP 2 2MF 35V 1096 SOLID SEALED TANT RADIAL SPRAGUE 1 1990225 9035 1 C2 C31028 000 CAP 1000PF 200VDC 10 CER 1 FAILURE KEMET 05 1 SERIES W V OPTION C1 C31032 000 0 01 200 0 10 1 FAILURE KEMET 06 1 SERIES W V OPTION D1 D3 D10 D14454 000 DIODE AXIAL MOTOROLA 1N4454 4 D8 D9 D14733 000 ZENER 5 1V 1W 1096 AXIAL MOTOROLA 1N4733 2 G30019 000 STANDOFF 4 40X 1 1 2 BRASS HEX MAL FEM HH SMITH 8226 4 11 2 110066 000 LED RED HIGH EFFICIENCY HIGH BRIGHTNESS 2 XU1 J14081 000 SKT DIP 8 PIN MACH SLEEVES AUGAT 508 AG11D 1 TPO J16210 000 TEST JACK BLACK VERTICAL EF JOHNSON 105 0853 001 1 TP1 J16211 000 TEST JACK BROWN VERTICAL EF JOHNSON 105 0858 001 1 TP2 J16212 000 TEST JACK RED VERTICAL EF JOHNSON 105 0852 001 1 J16213 000 TEST JACK ORANGE VERTICAL EF JOHNSON 105 0856 001 1 J2 J4 SEE NOTE J18086 000 CONN SMA JACK RECEPTACLE RIGHT ANGLE 0 18GHZ PC 3 MOUNT JOHNSON COMPONENTS 142 0701 301 J1 J31010 000 50 15 PIN MALE RIGHT ANGLE PCB 1 MOUNT AMPHENOL 617 A0
12. Sertes A28880 932 10 25444 000 HPA Interface A25444 000 5 3 REV F Model 200 468 Manual Text 5 3 Wiring Diagrams 20 22520 000 TWT Power Supply 10 1 2 Series 22520 090 5 4 REVF Model 2007468 Manual Text 5 4 Parts Lists A16485 000 A22520 090 A24324 000 A24369 000 A24380 030 A25444 000 A28880 932 HPA logic and control assembly C band power supply for TWT 5889 HPA system front panel assembly Remote control board Microwave power assembly HPA interface board 200W C band TWTA AR 10 1 2 series 5 5 REV F Model 200 468 Manual Text PARTS LIST HPA LOGIC AND CONTROL MODULE A16485 000 REF DESIG ETM P N DESCRIPTION QUANTITY B16485 000 HPA LOGIC AND CONTROL BOARD 1 C11 C16333 000 CAP 33MF 25V AERL NICHICON UVX1E330M 1 C2 C5 C15 C58 C31028 000 1000 200 10 1 FAILURE KEMET 05 4 SERIES W V OPTION C3 C9 C10 C13 C14 C31032 000 CAP 0 01MF 200VDC 10 CER 1 FAILURE KEMET 06 16 C17 C19 C21 C22 SERIES W V OPTION C27 C28 C30 C31 C33 C36 C46 C61 C31033 000 CAP 0 022MF 100VDC 10 CER 1 FAILURE KEMET 1 CKRO6B223K W V OPTION C24 C60 C31036 000 0 1 100 0 10 1 FAILURE KEMET 06 2 SERIES W V OPTION C1 C4 C6 C7 C16 C31040 000 CAP 1MF 50VDC 10 CER 1 FAILURE KEMET 06 SERIES 20 C18 C25 C26 C32 W V OPTION C34 C37 C38 C39 C40 C41 C43 C44 C45 C48 C49 D16 D23 D31 D10965 000 ZENER
13. U47 U23909 000 IC DUAL 4 BIT BINARY BIQUINARY COUNTER 74HCT390 1 SSD U41 U48 U24018 000 5 DECADE COUNTER W 10 DECODED 2 OUTPUTS 74HC4017 SSD U45 U24138 000 IC 8 BIT BINARY DOWN COUNTER 749640103 SSD 1 5 15 REV F Model 200 468 Manual Text PARTS LIST INTERFACE BOARD PLASTIC A25444 000 REF DESIG ETM P N DESCRIPTION QUANTITY U43 U26889 000 8 BIT MAGNITUDE COMPARATOR 74HCT688 SSD 1 U22 U24 U57 U28008 000 IC QUAD 2 INPUT AND 74HC08 SSD 3 U4 U49 U58 U28032 000 IC QUAD 2 INPUT OR 74HC32 SSD 3 U44 U46 U28040 000 12 BIT DECADE COUNTER 74HCT4040 SSD 2 U5 U13 U14 U23 U28074 000 IC DUAL D FLIP FLOP W RESET 74HC74 SSD 7 U25 U33 U50 U2 U281 23 000 IC DUAL RETRIGGERABLE 1 SHOT 74HC123 SSD 1 U31 U53 U28164 000 IC 8 BIT SERIAL IN PARALLEL OUT SHIFT REGISTER 74HC164 2 SSD U3 U12 U28 U37 U38 U28165 000 IC 8 BIT PARALLEL IN SERIAL OUT SHIFT REGISTER 74HC165 5 SSD RP6 U32001 000 FEED THROUGH RES NETWORK 16 PIN 1 316B102 RP1 RP5 U32103 000 10 FEED THROUGH RES NETWORK 16 PIN DIP A B 5 316B103 U56 U40008 000 REGULATOR OIL 5V 100MA TO 92 MOTOROLA MC78LO5ABP 1 U55 U40012 000 FLIP FLOP OCTAL D TYPE LATCH WITH NATIONAL 1 MM74HC273N 5 16 REV F Model 2007468 Manual Text REF DESIG A1 A3 A2 A9 A6 A5 A4 A10 A8 200 WATT C BAND TWTA AR 10 1 2 ETM P N A22520 090 A24324 000 A24380 03
14. ULTRA LOW NOISE PRECISION AMP ANALOG DEVICES 2 OP27GP U26 U00029 000 CONVERTER NO OIL 16BIT A D SERIAL OUT BURR BROWN 1 ADS7809PB PBJ ANALOG DEVICES AD977CN U17 U00524 000 IC INSTRUMENTATION AMP ANALOG DEVICES AD524A SSD 1 U15 U00725 000 IC DUAL 16 BIT DIGITAL TO ANALOG 1 CONVERTER BURR BROWN DAC 725 SSD U1 U03171 000 IC ADJUSTABLE VOLTAGE REGULATOR 15W 1 5A TO 220 NAT 1 LM317T U9 U10 U18 U04090 000 IC 4CH ANALOG MULTIPLEXER DATEL MXD 409 3 DP2 DP4 DP5 DP8 U08010 000 1 8 COMMON CATHODE CLAMPIMG DIODES 9 PIN SIP ROHM 5 DP9 DAN801 DP1 DP3 DP6 DP7 U08011 000 IC 8 COMMON ANODE CLAMPING DIODES 9PIN SIP ROHM 5 DP10 DAP801 U27 U11165 000 6 5536 7 CLOCK OSCILLATOR 1 2 SIZE ECLIPTEK 1 EC1100HS 6 5536MHZ SSD U40 U11528 000 IC VERSALINK TRANSMITTER HORIZONTAL 200UM FIBER 1 HEWLETT PACKARD HFBR 1528 U54 U12521 000 IC FIBER OPTIC RECEIVER HORIZONTAL HP HFBR 2521 1 SSD U36 U17545 000 DRIVER OIL DS75451N DUAL AND NATIONAL 1 SEMICONDUCTOR DS75451N U6 019 034 039 060 U20148 000 INVERTER SCHMIDTT TRIGGER 74HC14 SSD 5 U42 U20730 000 IC DUAL J K FLIP FLOP W RESET 7473 SSD 1 U51 U21328 000 IC QUAD 2 INPUT NAND SCHMIDTT TRIGGER 74HC132 SSD 1 U52 U21388 000 IC 3 TO 8 DECODER DEMULTIPLEXER INVERTING 74HC138 1 SSD U32 U21536 000 IC DUAL 4 INPUT DIGTAL MULTIPLEXER 74F153 SSD 1 U35 U22598 000 IC 8 BIT ADDRESSABLE LATCH W RESET 74HC259 SSD 1
15. body overcurrent or power low line that requires a reset the MENU screen is replaced by a screen indicating the nature of the fault Softkey S4 labeled OK is implemented as a reset key pressing S4 brings back the MENU screens Line 3 of MENU 1 which normally displays the operational state of the TWTA is used as a fault display line until the fault is cleared When the fault clears the system will automatically resume the standby state and high voltage on will be enabled once again Factory Service Screens A number of screens intended for factory service and calibration are behind passwords and are not accessible to the user System Malfunction Screens A number of screens are reserved to display error messages These messages are not normally seen and indicate a malfunction of the TWTA System malfunction messages include the following Database corrupt Communication failure Cannot restore CU line voltage too low to operate System shutdown In the event that one of these appears shut off the TWTA and contact an authorized service representative before proceeding N CAUTION Attempts to operate the TWTA despite control unit problems may result in loss of the static RAM database and calibration information 3 10 REV F Model 200 468 Manual Text 3 5 Rear Panel Features See Figure 3 4 below REMO INTERFACE IEEE 488 Figure 3 4 TWTA Rear Panel Features Table 2 TW
16. warning setpoint PSOTC C CO SPSOTC Sets p s overtemp warning setpoint V l RDIWOC Returns helix overcurrent warning setpoint mA IwOC 3 14 REV F Model 200 468 Manual Text SIWOC Sets helix overcurrent warning setpoint mA RDLOGIC Returns logic state code see Table6 RDA f Retumsgan 15 SA 05 50 Sets gain gain i dBm watts Sys A 1 RDHTDREM Returns remaining heater time delay HTD Js RDPOD Returns forward power out dBm Po dBm RDPOW Returns forward power out W watts Po W RDPRD Returns reverse power out dBm dBm Pr dBm RDPRW Returns reverse power out W Pr W mA se d Polo dBm setpoint dBm dBm setpoint W d d RDPOHID Returns over forward power warning Pohi dBm setpoint dBm d d d SPOHIW Sets over forward power warning setpoint watts W SPOHID Sets over forward power warning setpoint dBm w E setpoint W W setpoint dB dBm a setpoint W W ka kuya from System OFF Exit Sleep Mode kasa ji ss Enter Sleep Mode SHTRAUTOOFF Sets heater auto off delay see Table 9 IDN Retumstheproductmodel number STA 7 Returns status string see Table STB Returns status string see Table8 C Bm Bm Bm Bm Bm Bm m m 3 15 REV F Model 2007468 Manual Text Table 4 Catalog of Status C
17. 0 A24381 030 A24382 000 A25444 000 A26946 300 A28882 000 0598 000 PARTS LIST DESCRIPTION C BAND POWER SUPPLY FOR TWT 5889 230V HPA SYSTEM CONTROL FRONT PANEL ASSEMBLY MICROWAVE POWER ASSEMBLY 200 HPA CABINET 200C 10 1 2 SERIES DO NOT KIT COOLING SYSTEM 10 1 2SERIES HPA INTERFACE BOARD PLASTIC FIBERS CONTROL HEAD ENCLOSURE IEEE 488 WIRING KIT 10 1 2 SERIES WIRE HARNESS ASSY FOR 200T HPAS NEW TEMP SENSOR A28880 932 QUANTITY 5 17 REV Model 2007468 Manual Text 5 5 Recommended Spare Parts A10007 000 A10010 000 A10017 090 A16487 001 A21457 001 A21425 090 A23683 000 A23687 001 E00809 000 Y10051 000 Anode module assembly Heater power supply module PWM board Power board assembly High voltage filter assembly High voltage diode cap assembly Power factor correction 100 250V input Low voltage power supply module 220 V Power supply 28V 150 W Kepco FAW 28 3 5k Motorized impeller 340 CFM 24 VDC McLean DB716 24 25 S12 5 18 REV F Model 2007468 Manual Text 5 6 1000 1010 1030 1040 1041 1042 1050 1060 1070 1080 1090 1095 1100 1110 1120 1130 1140 Sample Program for IEEE 488 Communication CK KK xxx xxx 112 I IEEE 488 COMMUNICATIONS SOFTWARI McCLURE 7 24 92 AA RON D GI Uk kk CK CC xxx 130 COMMAND D
18. 07 000 DIODE 1000V 1A AXIAL MOTOROLA 1N4007 10 D1 D7 D14454 000 DIODE AXIAL MOTOROLA 1N4454 7 D9 D17 D14733 000 ZENER 5 1V 1W 10 AXIAL MOTOROLA 1N4733 2 H 110074 000 LED GREEN ALGAAS NON DIFFUSED HEWLETT PACKARD 1 HLMP 1540 J5 J10021 000 2 PIN MALE RIGHT ANGLE SERIES 7478 MOLEX 1 22 05 3021 5 13 REV F Model 200 468 Manual Text PARTS LIST INTERFACE BOARD PLASTIC A25444 000 REF DESIG ETM P N DESCRIPTION QUANTITY J1 J10371 000 D SUB 37 PIN MALE PCB MOUNT STRAIGHT POSITRONICS 1 MD37M3S000 XU17 J14161 000 SKT DIP 16 PIN MACH SLEEVES AUGAT 516 AG11D 1 XU26 J14202 000 SKT DIP 20 PIN MACH SLEEVES SAMTEC ICA 320 SGT 1 XU15 J14281 000 SKT DIP 28 PIN MACH SLEEVES SAMTEC ICA 628 SGT 1 TPO J16210 000 TEST JACK BLACK VERTICAL EF JOHNSON 105 0853 001 1 TP1 J16211 000 TEST JACK BROWN VERTICAL EF JOHNSON 105 0858 001 1 TP2 J16212 000 TEST JACK RED VERTICAL EF JOHNSON 105 0852 001 1 TP3 J16213 000 TEST ORANGE VERTICAL EF JOHNSON 105 0856 001 1 4 J16214 000 TEST JACK YELLOW VERTICAL EF JOHNSON 105 0857 001 1 TP5 J16215 000 TEST JACK GREEN VERTICAL EF JOHNSON 105 0854 001 1 TP6 J16216 000 TEST JACK BLUE VERTICAL EF JOHNSON 105 0860 001 1 J4 J18167 000 D SUB 37 PIN FEMALE PCB MOUNT RIGHT ANGLE 1 745784 4 J3 J18180 000 CONN D SUB 15 PIN MALE STRAIGHT PCB MOUNT 1 POSITRONIC MD15M3000 J2 J31013 000 CONN D SUB 25 PIN MALE RIGHT ANGLE PCB MOUNT AMP 1 747238 4
19. 15P AJ121 Q1 Q2 Q22907 000 TRANSISTOR PNP 2N2907A TO 18 2 R19 R21 R01150 000 5 150 OHM 1 4W 5 CC A B RCO7GF151J 3 R1 12107 000 TRIMPOT 1K 1 2W 10 CERMET 1T SIDE ADJ BECKMAN 72XL 1 R17 R20267 000 RES 267 OHM 1 2W 1 MF 100PPM DALE RN55D 1 R2 R20511 000 RES 511 OHM 1W 1 MF 50PPM DALE RN60C 1 R7 R12 R21121 000 RES 1 21K 1 2W 196 MF 100PPM DALE RN55D 2 R18 R23 R21464 000 RES 4 64K 1 2W 1 MF 100PPM DALE RN55D 2 R3 R8 R10 R13 R22 R22105 000 RES 10 5K 1 2W 1 MF 100PPM DALE RN55D 6 R4 R5 R6 R23100 000 RES 100K 1 2W 1 MF 100PPM DALE RN55D 3 R11 SEE NOTE R30071 000 10 1 2 10 100 20 1 ADJ BECKMAN 67W S2 S3 522004 000 SWITCH TOGGLE DPDT PC MNT AUGAT MTA 206N PC 2 5 10 REV F Model 200 468 Manual Text PARTS LIST REMOTE CONTROL BOARD A24369 000 REF DESIG P N DESCRIPTION QUANTITY 51 22010 000 SWITCH TOGGLE 4PDT ON NONE ON 125V 6A AUGAT 1 MTA 406N PC Ut U11458 000 IC DUAL OP AMP NAT LM1458CN 1 5 11 REV F Model 2007468 Manual Text REF DESIG A1 R1 R2 W3 A5 A6 D1 D2 A2 J1 J2 CB1 PARTS LIST MICROWAVE POWER ASSEMBLY 200C A24380 030 ETM P N DESCRIPTION QUANTITY 00888 009 CABLE RF FLEX 9 SMA MALE TO MALE 20 GHZ 50 0 141 1 CABLE INSULATED JACKET SRC 150 150 150090 E00888 012 FLEX 12 SMA MALE TO MALE 20 GHZ 50 0 141 2 CABLE INSULATED JACKET SRC 150 150 150120
20. 160 School House Road Souderton 18964 9990 USA 215 723 8181 215 723 5688 Declaration of Conformity We Amplifier Research 160 School House Road Souderton PA 18964 declare that our product Models 200T1G2 200T1G3 250T1G3 200T2G4 200T2G8 300T2G8 200T4G8 200T8G18 250T8G18 RF amplifiers to which this declaration relates is in compliance with the requirements of the EEC EMC Directive 89 336 EEC in accordance with the relative standards listed below EMC EN 50081 1 EN 50082 1 prEN 50082 1 EN 55022 1987 Class A 1000 4 2 1995 Air Discharge AND 8kV Contact Discharge ENV 1000 4 4 1995 1kV Power Supply AND 0 5kV I O Cables 50142 1995 Power Supply ENV 501441 1994 3Vrms The CE marking is affixed on the device according to article 10 of the EC Directive 89 336 EEC AR 7 Donald R Shepherd President Model 200 468 Manual Text INSTRUCTIONS FOR SAFE OPERATION BEFORE APPLYING POWER Review this manual and become familiar with all safety markings and instructions Verify that the equipment line voltage selection is compatible with the main power source Protection provided by the equipment may be impaired if used in a manner not specified by Amplifier Research INTENDED PURPOSES This equipment is intended for general laboratory use in a wide variety of industrial and scientific applications It is designed to be used in the process of gen
21. 223 000 CAP 0 22MF 35V TANT RADIAL JAMCO 33507 1 C20 C32 C100 C05153 000 CAP 1 5MF 35V TANT RADIAL JAMECO 1 5 35 4 C129 C163 C05223 000 CAP 2 2MF 35V 10 SOLID SEALED TANT RADIAL SPRAGUE 2 1990225 9035 1 C80 C81 C164 C06103 000 CAP 10MF 25V 20 SOLID TANT RADIAL AVX TAP106M025HSB 3 C15 C06220 000 CAP 22MF 16V SOLID TANT RADIAL AVX TAP226K016SCS 1 C99 C16103 000 CAP 10MF 35V AERL NICHICON UVX1V100 1 C101 C17222 000 CAP 220MF 16V AERL ILL CAP 227RAR016A 1 C47 C67 C17224 000 CAP 220MF 50V AERL ILL CAP 227RAR050A 2 C44 C168 C169 C30066 000 47 MF 35V SOLID TANT RADIAL 3 T356M476K035AS C165 C166 C6 C7 C31016 000 100 200 0 10 1 FAILURE KEMET CKRO5 10 9 C13 C16 39 SERIES W V OPTION 10 11 22 23 24 25 C31036 000 CAP 0 1MF 100VDC 10 CER 1 FAILURE KEMET CKRO6 61 26 28 30 33 35 40 SERIES W V OPTION 41 42 48 49 50 51 53 62 63 64 65 70 71 78 77 79 83 85 87 88 89 91 94 96 97 98 102 103 105 107 108 109 110 111 112 113 114 115 116 117 121 125 132 167 C12 C14 C21 C27 C31040 000 CAP 1MF 50VDC 10 CER 1 FAILURE CKR06 SERIES 44 C29 C31 C34 C36 W V OPTION C38 C17 C18 C19 C37 C54 C55 C56 C57 C58 C59 C60 C61 C118 C119 C120 C122 C123 C124 C133 C46 C52 C66 C68 C72 C75 C82 C84 C86 C90 C92 C93 C95 C104 C106 08 010 016 018 019 0140
22. 9 000 10010 000 09409 000 09408 000 10017 090 25398 090 24380 030 24324 000 22700 900 24369 000 26946 300 22488 001 25450 000 25444 000 24382 000 0598 000 24381 030 28882 000 200 WATT C BAND TWTA 10 1 2 SERIES C BAND POWER SUPPLY FOR TWT 5889 230 HEAT SINKIMOTHER BOARD LOW VOLTAGE POWER SUPPLY MODULE HPA LOGIC AND CONTROL MODULE 1500W AVR CURRENT POWER FACTOR PFC INDUCTOR FOR 100VAC 255VAC POWER BOARD ASSY C MODE INDUCTOR XFMR GATE DRIVE HAND WOUND XFMR GATE DRIVE HAND WOUND HIGH VOLTAGE DIODE CAP ASSY HV XFMR FOR TWT 5889 HV FILTER MODULE ANODE MODULE ASSY ANODE HV ASSY PULSE TOP XFMR FOR L BAND FEEDBACK XFMR HAND WOUND MODULATOR CONTROL HEATER POWER SUPPLY MODULE XFMR HEATER FEEDBACK XFMR HEATER POWER PWM BOARD FACTORY SELECT PARTS MICROWAVE POWER ASSEMBLY 200C HPA SYSTEM CONTROL FRONT PANEL ASSY HPA DISPLAY BOARD REMOTE CONTROL BOARD CONTROL HEAD ENCLOSURE IEEE 488 GPIB LINK TRANSCEIVER BOARD CPU BOARD W POWERFAIL 20MHZ HPA INTERFACE BOARD PLASTIC FIBERS COOLING SYSTEM 10 1 2SERIES WIRE HARNESS ASSY FOR 200T HPAS HPA CABINET 200C 10 1 2 SERIES WIRING KIT 10 1 2 SERIES 5 2 REV F Model 200 468 Manual Text 5 2 Schematics 10 16485 000 Logic and Control A16485 000 10 24369 000 Remote Control Board with Foldback A24369 000 10 24380 000 Microwave Power Assembly A24380 030 10 28880 000 200W 10 1 2
23. Allow the heater warm up delay to expire Line three will indicate OFF READY Push S4 MORE three times to go to MENU 4 Verify that the heater voltage and current are near their nominal levels The values of these parameters at the time the TWTA left the factory are logged on the test data sheet Push the OPERATE push button You will now see the cathode and the collector voltages rise Verify that the grid collector and cathode voltages are near nominal The helix current should be near the nominal value for no RF drive Then push MORE or EXIT to go back to MENU 1 Set the TWTA gain to maximum Adjust the RF generator to slowly increase the RF drive toward 0dBm to reach the desired FWD PWR on the display and power meter connected to sample port The forward power bar graph will become active with maximum length when peak power output is achieved Best performance is obtained when the input RF drive is set at or just below the level that causes peak power output Do not set input drive above 0dBm Input drive above 20dBm may damage the unit The reverse power level should remain below 10 of the forward power or 20 watts 43 dBm assuming that the load is properly matched An alternate procedure is to pre set the TWTA gain to minimum set the RF generator to 0 dBm and then slowly increase the TWTA gain to set the desired RF output level Observe that the helix current is sensitive to the RF drive level of the TWT It is at a minimum with n
24. ION Do not adjust 20 turn pot R11 its function is to set the foldback VSWR level and it is calibrated at the factory 3 13 REV F Model 200 468 Manual Text 38 Remote IEEE 488 Operation TWTA is provided with an IEEE 488 interface that permits remote emulation of OPERATE STANDBY and RESET push buttons as well as access to parameter measurements system faults and control unit status The following tables summarize the commands and the return codes Table 3 Catalog of IEEE 488 Commands RDSTAT Returns status code of processing of STATUS RENNES TC C RDFLT Returns system fault code see Table 5 5 OPERATE Emulates OPERATE push button 1 STANDBY EmulaeSTANDBYpusbbuton J POWER OFF Emulate STANDBY push button RESET Emulates RESET sofikey RDS N Returns serialnumber Smet RDCONHR Returns console hours RDRFHR jRetmnsRFhous 1 Returns power supply temp RDTWTOTF Returns TWT overtemp warning setpoint TWTOTF F CF STWTOTF Sets TWT overtemp warning setpoint F RDTWTOTC Returns TWT overtemp warning setpoint CC p C F F 5 Sets TWT overtemp warning setpoint C s F C mA TWTOTC JC RDPSOTF Returns power supply overtemp warning SF PSOTF F setpoint F SPSOTF Sets p s overtemp warning setpoint F RDPSOTC Returns p s overtemp
25. MAN L061C102G 1 W3 W8 W12200 000 WIRE 22 AWG BLU 600V TEFLON BELDEN 83006 6 5 7 REV F Model 200 468 Manual Text PARTS LIST C BAND POWER SUPPLY FOR TWT 5889 A22520 090 REF DESIG P N DESCRIPTION QUANTITY A8 A10007 000 ANODE MODULE ASSY 1 A9 A10010 000 HEATER POWER SUPPLY MODULE 1 11 10017 090 PWM BOARD 1 16485 000 CONTROL MODULE 1 5 16487 001 POWER BOARD ASSY C MODE 1 A6 A21425 090 HIGH VOLTAGE DIODE CAP ASSY FOR TWT 5889 1 A7 A21457 001 HV FILTER MODULE 1 A4 A23683 000 1500W AVR CURRENT POWER FACTOR 1 A2 A23687 001 LOW VOLTAGE POWER SUPPLY MODULE 1 A1 A24357 000 HEAT SINK MOTHER BOARD 1 A12 A25398 090 FACTORY SELECT PARTS 1 5 8 REV F Model 2007468 Manual Text REF DESIG A1 A2 XU1 J26 XJ26 XA2 52 U1 PARTS LIST HPA SYSTEM CONTROL FRONT PANEL A24324 000 ETM P N DESCRIPTION QUANTITY A22700 900 DISPLAY BOARD 1 A24369 000 REMOTE CONTROL BOARD 1 H13029 000 PLASTIC KNOB WITH FINGER DIMPLE HP 01650 47401 1 H17037 000 2 1 2 1 1 4 AR 1006659 1 101 1 H17038 000 PAL NUT FOR AR ESCUTCHEON AR 14048 2 J01031 000 CONN MALE 3 PIN 063 MOLEX 03 06 20332 1 J03013 000 CONN PIN MALE 063 MOLEX 002 06 2103 3 N21564 001 DISPLAY VIEW WINDOW 1 N22922 900 COVER PLATE REMOTE CONTROL BOARD 1 N23921 000 COVER SUPPORT 2 N24324 000 FRONT PANEL 10 5SERIES 1 N24325 000 TRIM RAIL 2 532074 000 SWITCH KEYLOCK 1 POLE 3 POS
26. TA Rear Panel Features 190 260 VAC IN AC power input connector REMOTE INTERFACE EXTERNALINTERLOCK Connector to remote temperature switch protecting the isolator load 8 RFoutputtypeN female Holes for rear support 4 Cooling airintake i 6 3 11 REV F Model 200 468 Manual Text 36 Initial Turn On and Warm up Procedure Install the TWTA as discussed in section 3 2 Provide an RF generator to the RF input Type N connector A1J1 Set RF generator level below 50dBm and set desired frequency in specified range Connect a load suitable for 350 watts continuous operation to the output coax The load VSWR should be less than 2 0 1 A power meter and suitable attenuators may be connected to the RF sample port A1J2 Refer to RF sample port calibration factors on the rear of the unit or on the Info screen in MENU 2 These show the relation between the amplifier output power and the RF sample port power as a function of frequency When only the power of the fundamental frequency is to be measured and when operating near rated power use filters a frequency selective receiver or a spectrum analyzer to reduce the harmonic content of the measured level Set keylock to LOCAL Switch on the MAIN POWER circuit breaker The fan will operate The front panel display will show several identification messages and then the MENU 1 screen The third line will indicate that the heater time delay is active
27. TO SEND TO POWI 1 2 lt gt RD THEN GOTO 1060 DIM F 80 DIM A 80 CLEAR SCREFN INPUT INPUT COMMAN IF AS EXIT THEN 1 OUTPUT 701 5 IF A IF AS 1 1 THEN GOTO 1100 ENTER 701 F PRINT OUTPUT FRO GOTO 1060 CLEAR SCREEN END IS ER SUPPLY NFS EXIT TO QUIT AS 5 19 REV F
28. W 596 CC A B RCO7GF825J 1 R13 R14 R10002 000 TRIMPOT 5K 1 2W 1096 CERMET 20T SIDE ADJ BOURNS 2 3296 1 502 R76 R21499 000 RES 4 99K 1 2W 1 MF 100PPM DALE RN55D 1 R10 R21523 000 RES 5 23K 1 2W 196 MF 100PPM DALE RN55D 1 R16 R21866 000 RES 8 66K 1 2W 1 MF 100PPM DALE RN55D 1 R52 R73 R21887 000 RES 8 87K 1 2W 1 MF 100PPM DALE RN55D 2 R67 R21953 000 RES 9 53K 1 2W 1 MF 100PPM DALE RN55D 1 R47 R48 R22200 000 RES 20K 1 2W 196 MF 100PPM DALE RN55D 2 R79 R80 R22470 000 RES 47K 1 2W 1 MF 100PPM DALE RN55D 2 R42 R60 R61 R89 R23100 000 RES 100K 1 2W 1 MF 100PPM DALE RN55D 4 R33 R55 R23698 000 RES 698K 1 2W 1 MF 100PPM DALE RN55D 2 R41 R23750 000 RES 750K 1 2W 1 MF 100PPM DALE RN55D 1 R21 R23845 000 RES 845K 1 2W 1 MF 100PPM DALE RN55D 1 R66 R23953 000 RES 953K 1 2W 1 MF 100PPM DALE RN55D 1 R12 R15 R32020 000 TRIMPOT 10K 1 2W 10 CERMET 20T SIDE ADJ BECKMAN 67X 2 04 U5 U6 U02390 000 IC QUAD COMPARATOR NAT LM139J 3 07 U03240 000 IC LOW POWER LM324 1 09 U10070 000 REFERENCE PRECISION 10V LINEAR TECH LT1031DCH 1 U8 U17805 000 5 REGULATOR TO 220 NAT LM340T 5 0 1 01 02 U3 U20148 000 INVERTER SCHMIDTT TRIGGER 74HC14 SSD 3 RP8 U30106 000 10 5 NETWORK 6 PIN SIP DALE MSP06A 01 103G 1 RP1 2 RP5 7 RP9 U30410 000 1 10 2 0 40 10 PIN ISOLATED RESISTORS DALE 6 MSP10C 03 103G OR BOURNS 4610H 102 103 RP4 U31020 000 IC 1K RES NETWORK SIP BECK
29. XJ1 XJ4 J31014 000 SPRING LATCH KIT D SUB AMPHENOL 17 529 4 K1 K6 K02009 000 RELAY DPDT 5VDC 125V 0 5A 30VDC 1 CONTACTS PCB 6 TERMINALS SEALED OMRON G6H 2 DC5 L1 L4 L00200 000 WIDE BAND CHOKE VK200 10 3B FERROXCUBE 4 Q1 Q2 04 Q5 Q6 022222 000 TRANSISTOR NPN 2N2222A TO 18 8 Q7 Q8 R2 R01220 000 RES 220 OHM 1 4W 5 CC A B RCO7GF221J 1 R41 R01680 000 5 680 OHM 1 4W 5 CC A B RCO7GF681 1 R1 R04200 000 RES 200K 1 4W 5 CC A B RCO7GF204J 1 R4 R7 R05820 000 RES 8 2M 1 4W 5 CC A B RCO7GF825J 2 R6 R8 R58 R20100 000 RES 100 OHM 1 2W 1 MF 100PPM DALE RN55D 3 R57 R20200 000 RES 200 OHM 1 2W 1 MF 100PPM DALE RN55D 1 R11 R20243 000 RES 243 OHM 1 2W 1 MF 100PPM DALE RN55D 1 R16 R20845 000 RES 845 OHM 1 2W 1 MF 100PPM DALE RN55D 1 R59 R22332 000 RES 33 2K 1 2W 1 MF 100PPM DALE RN55D 1 R3 R5 R30071 000 10 1 2 10 100 20 2 ADJ BECKMAN 67W 5 14 REV F Model 200 468 Manual Text PARTS LIST INTERFACE BOARD PLASTIC A25444 000 REF DESIG ETM P N DESCRIPTION QUANTITY R9 R12 R15 R22 R30103 000 RES 10K 1 8W 1 MF AXIAL 100PPM DALE CMF 50 9 R35 R36 R40 R44 RN50C1002F R17 R19 R20 R21 R30140 000 RES 1K 1 8W 1 MF 50PPM DALE RN50C 12 R23 R25 R28 R31 R42 R43 R46 R18 R13 R14 R24 R26 R31164 000 RES 100K 1 20W 1 FILM AXIAL 100PPM MIL DALE 11 R27 R29 R32 R37 RN50C1003F R38 R39 R47 U7 U8 U00027 000 IC
30. accumulates and results in a significant indication in a broadband measurement device such as a power meter or field probe The error produced by this indication is not significant when operating near rated TWTA power levels but may cause difficulty when trying to operate high power TWTAs at low output power levels For example consider a hypothetical typical NPD of 76 dBm Hz from a 4 GHz bandwidth amplifier A broadband detector might see the NPD as 76 dBm Hz 10 log 4 x 10 BW factor 76 96 20 dBm or 0 1 watts This power is insignificant for a user operating at 200 watts 4 53 dBm but may be very noticeable to a user trying to operate below 1 watt 30 dBm One watt is 0 5 of 23dB below rated power for a 200 watt amplifier A field probe user who obtains a 200 V M field with 200 watts may see a field as high as 53dBm 20dBm 33dB below 200 V M 4 5 V M due to this hypothetical NPD For these applications the use of a lower power amplifier is highly recommended especially when considering safety issues Alternatively additional power loss in the form of an added high power microwave attenuator or preferably an increased space loss for radiated fields may be used to lower the noise received by the broadband measurement device Explanation of Limiting the Time in Standby mode and of Repeated Operate Selection Traveling wave tubes tend to get gassy if they are left in a Standby mode for extended per
31. an result in damage to the RF amplifier or intermittent shut downs NOTE The contents of this document are the property of the manufacturer and this document is delivered on the express condition that it not be disclosed reproduced in whole or in part or used for manufacture for anyone other than the manufacturer without its written consent and that no right is granted to disclose or so use any information in this document Model 2007468 Manual Text SECTION I SECTION II SECTION III SECTION IV SECTION V TABLE OF CONTENTS Description and Specifications 1 1 TWTA Description 1 1 1 2 Suggested Applications 1 1 1 3 Specifications cse ei er s 1 1 IA ACCESSOS Gi 1 1 1 5 Test Data SEC iae ierra e inni 1 2 Theory of Operation 2 1 Design of the Amplifier 2 1 2 2 Description of RF Circult 2 1 2 3 Description of Power Supply 2 2 Operation 3 1 Warnings and Cautions os ege eu 3 1 3 2 salater RENT 3 2 3 2 T Unpacking ien ak 3 2 322 MOUNTING a Raa ee 3 2 3 2 3 Cooling Requirements 3 4 3 2 4 AC Line Power Connection
32. d traveling wave tube amplifier TWTA 1 1 TWTA Description The amplifier uses a 250 watt traveling wave tube TWT to provide 200 watts minimum output over the TWT amplifier s full bandwidth The amplifier is well suited for susceptibility and general laboratory testing where instantaneous bandwidth and high gain are required The amplifier is completely self contained and packaged for standard 19 inch rack mounting or bench top use The front panel of the rack mountable amplifier is 10 5 inches high and the overall unit is 25 25 inches deep excluding the rear panel connectors For bench top use the amplifier is supplied in an enclosure with integral carrying handles Primary power is 190 260 volts 50 60 Hz single phase An efficient switching power supply design provides minimum power consumption A fast regulation control loop and a high degree of filtering ensure performance within specifications over a wide range of operating conditions The amplifier is fully enclosed and the lower panel of the rack mountable amplifier is interlocked to reduce the likelihood of accidental contact with high voltage 12 Suggested Applications RF Susceptibility testing Antenna and component testing Equipment calibration General laboratory instrumentation 1 3 Specifications Refer to the Amplifier Research Data Sheet on the following pages for detailed specifications 14 Accessories Amplifier Research offers a number of accessories for use with
33. e command STB causes the TWTA to send a string containing an operational state code consisting of 2 ASCII characters representing hex digits The response is in the form STATUS x y eol where the hex values of and y are formed as shown below Power status always 1 power on Standby status 0 if not in standby 1 if in standby Operate status 0 if not in operate 1 if in operate Fault status 0 if no fault 1 if fault exists Meaning 4 LSB Mode switch always 1 reset Blank switch always 1 off Blank status always 0 off 7 MSB Not used always 0 Table 9 Catalog of Heater Auto Off Time Delay Codes 0 0 5 hour heater auto off time delay 1 0 hour heater auto off time delay Command syntax 15 in this form lt command mnemonic gt lt parameter gt lt carriage return gt where command mnemonic gt consists of one of any valid command found in Table 3 parameter as applicable consists of one ASCII space character followed by a number carriage return consists of an ASCII carriage return All commands are case sensitive The system will return parameter values fault codes and status codes regardless of whether remote is enabled The parameter value is returned as a string of 20 characters or less consisting of a label and a value For example outputting the command RDEF to the TWTA would result in the TWTA sending back the string Ef 6 03 assuming the heater voltage is 6
34. ed beep volume S1 SET toggles between parameters and the adjust knob is used to enter the data Setup 7 allows the IEEE 488 address to be set MORE returns you to SETUP 1 EXIT returns you from any of the setup screens to MENU 2 3 8 REV F Model 200 468 Manual Text Sleep Mode The Sleep Mode feature allows the user to selectively shut off the heater module of the power supplies This can be done manually through the front panel or remotely via the computer interface This is typically used during extended periods of remote operation to improve tube life by turning off the filaments Sleep Mode activated This eliminates excessive STANDBY hours on the TWTS while still permitting remote capability to turn on the amplifier To activate Sleep Mode locally Press the MORE soft key to get to MENU 2 At MENU 2 press the SETUP soft key to get to SETUP 1 At SETUP 1 press SET to activate Sleep Mode turn heater and fan off The system will ask Are you sure Press SET again After activating the Sleep Mode Screen will display Cooling On while heaters cool down System Off notifies user that the amplifier is in Sleep Mode To de Activate Sleep Mode locally Press the ON soft key to de activate Sleep Mode Amplifier will return to MENU 1 When de activating the Sleep Mode the heaters will require approximately a 5 minute heater time delay Wait the full 5 minutes prior to selecting OPERATE For remote activation of Sleep Mode or t
35. een positively established that the high voltage filter capacitors have been discharged to a known safe level Safety Ground WARNING Improper grounding of this equipment can result in electric shock The TWTA must be operated only with a line cord with a safety ground wire It is the user s responsibility to ascertain that the power connector is properly wired and that the power outlet is grounded 3 1 REV F Model 200 468 Manual Text Explosive Atmosphere N WARNING To avoid explosion never operate this TWTA an explosive atmosphere This equipment is not certified for operation in an explosive atmosphere 3 2 Installation 3 2 1 Unpacking Upon receiving the TWTA unpack the unit and inspect it for obvious signs of external damage If damage is observed notify the carrier and contact an authorized service representative Save and store the shipping container in case the unit needs to be returned in the future for calibration or repair 3 2 20 Mounting The TWTA may be operated as a standalone benchtop unit or it may be installed in a 19 rack If rack mounting is desired first remove the amplifier from the cabinet then install the amplifier in the rack NOTE Due to the weight of the unit the lifting and removal of the amplifier from the cabinet is an operation requiring two people Before removal disconnect power RF and any other interface connectors On the rear of the unit remove any screws used to co
36. ellow Green Green Safety Ground N CAUTION Connect plug to J1 and secure plug with bracket only when no AC is supplied to the cord 3 4 REV F Model 200 468 Manual Text 3 2 5 RF Connections The RF output connector is type N female coaxial connector N CAUTION Never operate the TWTA without a matched output load rated for at least 350 watts continuous The TWTA is not provided with an output isolator Full reflected power may irreparably damage the TWT Even with no drive looping oscillation can result in RF output high enough to damage the tube if it is operated without a load The VSWR detection and foldback circuit is provided to protect the tube from progressive failure or mismatch of the output load it should not be relied on for protection from the absence of a load If an external isolator is installed at the output of the TWTA either the isolator should have a load capable of dissipating the full output of the TWTA or the isolator load should be provided with a temperature sensing switch The temperature switch should be normally closed self resetting and with a temperature rating such that there is no possibility of damaging the load by overheating before the switch opens The TWTA may be interlocked with the switch by connecting it between pins 3 and 4 of the external interlock connector J3 If no external isolator is used install a jumper between pins 3 and 4 See section 3 2 6 External Interlock Connector belo
37. erating controlling and measuring high levels of electromagnetic Radio Frequency RF energy Therefore the output of the amplifier must be connected to an appropriate load such as an antenna or field generating device It is the responsibility of the user to assure that the device is operated in a location which will control the radiated energy such that it will not cause injury and will not violate regulatory levels of electromagnetic interference HAZARDOUS RF VOLTAGES The RF voltages on the center pin of the RF output connector can be hazardous The RF output connector should be connected to a load before AC power is applied to the amplifier Do not come into contact with the center pin of the RF output connector or accessories connected to it Place the equipment in a non operating condition before disconnecting or connecting the load to the RF output connector SAFETY GROUND This equipment is provided with a protective earth terminal The main power source to the equipment must supply an uninterrupted safety ground of sufficient size to the input wiring terminals power cord or supplied power cord set The equipment MUST NOT BE USED if this protection is impaired PHYSICAL DAMAGE The RF amplifier should not be operated if there is physical damage missing hardware or missing panels MAINTENANCE CAUTION Adjustment maintenance or repair of the equipment must be performed only by qualified personnel Hazardous energy may be present whi
38. ind the TWTA of at least two feet for single bench top units and at least three feet for the higher power units or the heated air should be ducted away 3 19 REV F Model 200 468 Manual Text Operation in Standby Mode Standby mode for TWTAs readies the unit for operation In this mode the filaments are on but the high voltage is off TWTAs should not be left in this Standby mode for extended periods Where practical operational procedures should limit the time on Standby mode to less than approximately one hour See Explanation of below Operate Turn on When selecting the Operate mode when high voltage is first turned on there may be some internal TWT arcing which can cause protective circuits to deselect the Operate mode thereby returning the unit to the Standby mode There may be a report of body over current fault In either case if there is no other contraindication the Operate mode may be selected again This procedure may be repeated if needed up to 25 times until the Operate mode is actually set If this condition persists contact Amplifier Research Service for additional assistance See Explanation of below Noise Power Density NPD TWTAs produce rf noise over their operating frequency range as specified by the Noise Power Density NPD This noise is significantly higher than the noise produced by typical solid state amplifiers and is inherent in present TWTAs The noise may surprise users new to TWTAs when it
39. iods of time In this Standby mode the heater filament is on but there is no high voltage applied to the collector or high voltage is applied to the collector but the grid is off This is the normal state after a tube s warm up time just prior to entering the Operate mode In this state the cathode end of the TWT is heating up but the electron Beam is off In other words there is no cathode current As the cathode heats up gas trapped in the structure of the tube can be released thus corrupting the vacuum of the tube If the tube become too gassy arcing may occur when the high voltage is fully applied in the Operate mode Another possible failure mode is a body over current fault when the beam is turned on and the tube is gassy 3 20 REV F Model 200 468 Manual Text Occasional arcing is normal for a TWT The support components are designed to handle this protecting both the TWT and its support circuitry However if the tube arcs two or three times in rapid succession or worse yet repeatedly a fault will be sensed that will shut the high voltage off thus removing the unit from Operate status The remedy usually recommended is to repeat the selection of the Operate mode until the unit remains in Operate It as been found that most of the faults that can be cleared by this method will be cleared within 25 attempts to enter the Operate mode Once the tube is operating normally gas will co
40. ions from the logged values appear If the unit is under warranty contact an authorized service representative if impaired performance is suspected If there is accumulated dust on the air intake grill clean it with dry compressed air If significant dust has been noted on the air intake grill it may be desirable to vacuum the dust and debris from inside the enclosure To open the enclosure 1 Remove the amplifier from the cabinet or rack as follows NOTE Due to the weight of the unit the removal of the amplifier from the cabinet or rack is a two person operation Disconnect power RF and any other interface connectors On the rear of the unit remove any screws used to connect brackets to amplifier two on each bracket On the front of the unit remove the four screws two outside screws on each side mounting the front panel to the cabinet Carefully slide the amplifier out of the front of the cabinet 2 Remove the six screws that secure the lower cover and the six screws that secure the upper cover Remove the covers to gain access to the interior of the TWTA Vacuum dust and debris from inside the enclosure Clean dust from the TWTA and its flying leads Remove any dirt from around the five high voltage connectors While the cover is off check for loose wires components or fasteners Reassemble in reverse order 4 2 REVF Model 2007468 Manual Text 4 4 Troubleshooting Symptom TWT or power supply overtemperatu
41. itching supply Switching transistors are on the Power Board Assembly A16487 001 and switching is controlled by the Pulse Width Modulation PWM Board A10017 090 The high voltage transformer and rectifiers are contained in the High Voltage Diode Cap Assembly A21425 090 The high voltage DC is filtered in the HV Filter Assembly A21457 001 Interconnects between the power supply modules are through a motherboard It is installed in a finned heat sink assembly to which the modules are bolted The heat sink is cooled by the incoming cabinet air The Heat Sink Motherboard assembly is A24357 000 2 2 REV F Model 200 468 Manual Text SECTION III OPERATION 3 1 Warnings and Cautions Throughout this manual the symbol WARNING indicates that a hazard exists that may result in personal injury or loss of life N CAUTION indicates that failure to follow procedures may result in damage to the equipment The symbol DANGER High Voltage Present WARNING Electrical equipment in this TWTA generates and stores high voltage energy that can result in fatal electrocution Do not operate the with covers or the front panel removed Service work must be performed only by technicians thoroughly familiar with the high voltages present in microwave tube amplifiers in general and with this equipment in particular Never handle the TWT leads or the high voltage connectors unless the unit has been unplugged and it has b
42. le protective covers are removed from the equipment even if disconnected from the power source Contact may result in personal injury Replacement fuses are required to be of specific type and current rating Model 200 468 Manual Text INSTRUCTIONS FOR SAFE OPERATION continued SAFETY SYMBOLS This symbol is marked on the equipment when it is necessary for the user to refer to the manual for important safety information This symbol is indicated in the Table of Contents to assist in locating pertinent information Dangerous voltages are present Use extreme care CAUTION caution symbol denotes a potential hazard Attention must be given to the statement to prevent damage destruction or harm D Indicates protective earth terminal RANGE OF ENVIRONMENTAL CONDITIONS This equipment is designed to be safe under the following environmental conditions Indoor use Altitude up to 2000M Temperature of 5 C to 40 C Maximum relative humidity 80 for temperatures up to 31 C Decreasing linearity to 50 at 40 C Mains supply voltage fluctuations not to exceed 10 of the nominal voltage or minimum and maximum autoranging values Pollution degree 2 Normally non conductive with occasional condensation While the equipment will not cause hazardous condition over this environmental range performance may vary COOLING AIR Care should be exercised not to block the cooling air inlets or outlets Cooling air blockage c
43. lifier Periodic checking of the status is also recommended 3 9 TWTA General Considerations This section is intended to offer some guidelines regarding operation storage and use of Amplifier Research TWTAs Storage TWTAs as with other electronic equipment are best stored in a benign environment at reasonably constant temperature Service life is not improved by periodic operation Availability For critical missions and after long periods of storage it is recommended that TWTA operation be checked sufficiently in advance of the mission to permit repair if required Though service life is not improved by periodic operation users experiencing amplifier trip due to body over current may benefit by periodically operating a unit with high voltage and grid on but no rf drive Such operation for about one hour on a weekly basis should effectively reduce nuisance tripping Since the cathode structure has finite life extended periods of non functional operation of TWTAs is not recommended alternate approach if periodic trip off has been observed is to operate the unit without rf input for 1 2 hours before planned functional operation resetting the unit after occasional trip off Cooling during Operate Mode AR TWTAs have their air outlets and inlets on the rear panels It is important to prevent the heated air which is expelled from the TWTA s air outlets from being recycled into the air inlets Applications should have a clearance beh
44. nnect transport brackets to amplifier two on each bracket Reinstall screws in holes in chassis On the front of the unit remove the four screws two outside screws on each side mounting the front panel to the cabinet Carefully slide the amplifier out of the front of the cabinet 3 2 REV Model 200 468 Manual Text N CAUTION Never rack mount the TWTA using the front panel alone The chassis is likely to be damaged unless its weight is supported Bottom support rails must be provided in a rack mount configuration See Figure 3 1 below for the locations of threaded holes that may be used for supplementary support of the rear of the TWTA for transport Screws installed in these threaded holes may be removed and replaced with screws of appropriate length to thread 3 8 5 8 inch into the TWTA chassis FP 7 8 32 TAPPED 16 130 FOR REAR SL 4 PLACES REMOTE INTERFACE 488 Figure 3 1 Rear View of HPA For rack mount installation of multiple units the units should be separated vertically by at least 1 3 4 inches This will allow room for necessary support rails and facilitate installation and removal of the units 3 3 REV F Model 200 468 Manual Text 3 2 3 Cooling Requirements The TWTA is provided with a cooling fan It is important that air movement around the rear of the unit be unobstructed
45. ntinue to evolve at a slow enough rate that the TWTA will not fault This happens because the gas in the tube will interact with the beam and become ionized As the electrons in the beam hit the gas molecules they ionize the gas at which point it is accelerated into the collector structure and buried deep enough so that it ceases to be a problem 3 21 REV F Model 200 468 Manual Text To preclude this gassing problem and thus reduce the need for repeating the Operate selection it is recommended that the time in Standby be limited to about one hour Extended periods in Standby may result in an inability to clear the fault by this method In this case service measures may be needed to correct the unit Thus users should reduce the likelihood of occurrence of this problem by limiting the amount of time in the Standby mode The service measures involve pulsing of the tube beam current and gradually increasing the duty of the pulsing until the unit will operate continuously Note that a similar condition can exist for tubes with grids when the TWTA is in the Operate mode high voltage is on but gating control input is set so that the grid turns off the TWT beam current Operational procedures should also limit the time in this mode 3 22 REV F Model 200 468 Manual Text SECTION IV MAINTENANCE The TWTA does not require routine scheduled maintenance The only moving parts are the elements of
46. o RF drive The helix current with no drive and with 200 watts RF output mid band are logged on the test data sheet The value of the helix current is a good qualitative indicator of RF drive present To shut the system down turn down the RF generator level below 50dBm and press STANDBY Allow the TWTA to cool down until the TWT temperature drops below 70 C and then turn off main power 3 12 REV F Model 200 468 Manual Text 37 Emergency Bypass Operation For reference see schematic 10 24369 000 in section 5 2 TWTA is provided with a means of operating the amplifier manually in the event that there is failure of the control module and it is imperative that the amplifier remains on line N CAUTION Emergency bypass operation disables external interlock and certain protective and diagnostic features For this reason the emergency bypass mode of operation should be used only when the control unit fails and when it is essential to remain on line To access the manual controls remove the two 4 40 screws securing the Emergency switch cover plate on the front panel Emergency bypass mode is selected by pushing the left hand switch S1 to the left The center switch S2 toggles between high voltage on left and high voltage off right The right hand switch S3 selects between beam on left and beam off right There is a manual control for the gain adjustment as well This is a flat square single turn pot R1 N CAUT
47. o set the Auto Sleep Mode timer remotely see Table 3 in Section 3 8 Warnings Screens From MENU 3 51 labeled WARNINGS selects WARNINGS 1 that allows the operator to enter the maximum forward power The existing value is between brackets pressing SET puts arrows around the value indicating that the adjust knob is active The effect of the warning setpoint is as follows if the forward power exceeds the setpoint the audible alarm will sound if configured in SETUP 3 This warning will be repeated every thirty seconds until the over forward power condition is cleared In addition a warning message will appear on line 3 the status line of MENU 1 In the event that the alarm is heard the operator should go to MENU 1 to determine the cause Pressing more brings up WARNINGS 2 which allows the under forward power setpoint to be entered Adjusting this to the minimum value causes OFF to be selected disabling this alarm In WARNINGS 3 the maximum reverse power level is set Note that these are warning levels at which the beep sounds the actual maximum reverse power level that generates a system fault is set in hardware in the TWT power supply HPA Logic and Control module 416485 MORE brings up WARNINGS 4 which allows input of the maximum cabinet temperature Entering this parameter is performed as above MORE brings up WARNINGS 5 identical to the previous screen except that it deals with the maximum TWT collector block tempera
48. odes O No command was given 6 Command is not allowed in current system state U 1 Please call a service representative if you observe this error Table 5 Catalog of Fault Codes O 0 8 0 9 Lowlie O RDSTAT command causes the TWTA to return a string in the form STATUS code where code is an ASCII number whose meaning is given below The RDFLT command causes the TWTA to return a string in the form flt code where code is an ASCII number whose meaning is given below 3 16 REV F Model 2007468 Manual Text Table 6 Catalog of System State Codes The RDLOGIC command causes to send a string containing an operational state code consisting of 4 ASCII characters representing hex digits The response is in the form Sys w x y z eol where the hex values of w x y and z are formed as shown below 6 Foldbackactive O 9 Mnterlockopen Table 7 STA Response Codes The command STA causes the TWTA to send a string indicative of the current system state STA response SLEEP Sleep Mode active heater off WARM UP System is in heater time delay STANDBY System is ready to allow high voltage on OPERATE High voltage is on and beam is on FAULT High voltage is off and system requires reset 3 17 REV F Model 200 468 Manual Text Table 8 STB Response Codes Th
49. ptic links to the HPA interface assembly A25444 000 TWTA packaging consists of a cabinet assembly A24381 030 a cooling system A24382 000 utilizing a DC powered backwards curved impeller blower and a DC power supply and various chassis wiring components 2 2 Description of the RF Circuit A24380 030 The TWTA consists of two stages of RF amplification a solid state preamp assembly with adjustable gain E01198 000 and a traveling wave tube amplifier E30069 000 The type N RF input connector is located on the rear panel The RF input is fed to the input connector on the solid state preamp The solid state preamp s output drives the RF input of the TWT The RF output of the TWT is a type N female connector The output is directed through a cable to a dual coaxial 30 dB directional coupler The output of the coupler is a type N female connector which protrudes through the rear panel to serve as the amplifier s RF output connector The reverse port on the directional coupler is connected to a detector diode whose output is used for VSWR protection by the power supply logic board for VSWR measurement in the leveling loop and for reverse power measurement on the HPA interface board 2 1 REV F Model 200 468 Manual Text The forward port output is split by a 3 dB splitter One output is connected to a detector diode via a pad The output of the detector is used on the HPA interface board to measure forward power The othe
50. r port of the splitter is connected to the RF sample port on the rear panel A pad between the splitter and the port isolates the forward power measurement from mismatches at the sample port Amplifier gain is determined by the solid state preamp SSA which has a voltage controlled attenuator The control head determines the output of a digital to analog converter DAC on the HPA interface board The output of the DAC controls the SSA attenuator The remote control board A24369 000 mounted behind the front panel is provided with a circuit that increases the attenuation so that reverse power is limited to a safe level on the order of 20 to 50 watts In emergency bypass operation see section 3 7 the attenuator signal is provided locally on the remote control board The foldback circuit remains on line in emergency bypass operation 2 3 Description of the Power Supply A22520 090 The TWT power supply is of modular construction Low voltage power for logic and control of the entire power supply assembly the preamplifier and the HPA interface board is provided by the low voltage power supply module A23687 001 Control logic and TWT protection circuits are contained in the HPA logic and Control Assembly A16485 000 The Heater Power Supply Module A10010 000 powers the TWT DC heater The high voltage power supply consists of the following the Power Factor Correction module A23683 000 converts line voltage to DC for the high voltage sw
51. re No response when main power turned on Control module display does not come up unit does not beep when powered up Control module does not boot Control module datalink failure error appears Heater power supply does not come up No high voltage Voltages normal but no RF output helix current low Possible cause Air inlet filter dirty Collector heat sink dirty Inadequate clearance behind TWTA High air inlet temperature Defective blower or power supply Panel open interlock switch open Shorted or defective control module power supply Control module failure EPROM s missing HPA interface failure Fiberoptic link failure 15 VDC supply failure Defective low voltage power supply module Defective heater power supply module Open external interlock Keylock switch on INHIBIT or REMOTE Defective high voltage power supply No RF input Defective remote control board Defective SSA Gain turned down Open inhibit After review of the symptoms of the failure the user may want to check for a loose connector or component especially after rough handling of the unit Look externally for physical damage and internally for unmated or loose parts The service technician should become familiar with the internal mechanical construction to permit correct re assembly Limited troubleshooting may be conducted with caution based on the failure symptom and an understanding of the logic schematic diagrams 4 3 REVF
52. switches relays and blowers Preventive maintenance is recommended in Paragraph 4 3 The TWTA is basically a factory repairable unit However since limited logic schematics and partial parts information is supplied in this manual Section V some user service organizations may choose to perform their own corrective maintenance Warnings and Cautions should be observed WARNING Service work must be performed only by technicians thoroughly familiar with the high voltages present in microwave tube amplifiers in general and with this equipment in particular 4 1 Safety Warning Never handle the TWT leads or the high voltage connectors unless it has been positively established that the high voltage filter capacitors have been discharged to a known safe level N CAUTION A malfunctioning power supply can cause damage to the TWT If you are troubleshooting the TWTA remove the TWT and substitute suitable loads to prevent damage to the TWT 42 Unauthorized Repairs N CAUTION Unauthorized repairs or modification of this product during the warranty period may void the warranty In the event that the TWTA malfunctions while it is still under warranty always contact an authorized service representative 4 1 REVF Model 200 468 Manual Text 4 3 Preventive Maintenance The RF characteristics and power supply voltages and currents of the TWTA should be logged on a regular basis Maintenance should be performed if significant deviat
53. this amplifier including e Directional coupler e Antenna e Flexible transmission line Refer to a current Amplifier Research catalogue for Microwave Accessories 1 1 REV F Model 200 468 Manual Text 1 5 Test Data Sheet A Test Data Sheet for a specific unit is prepared at the time of manufacture and is included with the unit s copy of this manual 1 2 REV F Model 200 468 Manual Text SECTION II THEORY OF OPERATION 2 1 Design of the Amplifier The Model 200T4G8 TWT amplifier consists of four principal subsystems Two of these subsystems the microwave power assembly A24380 030 and the TWT power supply A22520 090 are discussed in sections 2 2 and 2 3 respectively The other two subsystems are the microprocessor control system and the TWTA packaging These both consist of a number of subassemblies See the build tree in section 5 1 for further information about how the parts lists are structured The heart of the microprocessor control system is the control head assembly A26946 300 and the HPA display board A22700 900 The microprocessor control system supervises the power supply provides metering display processes operator front panel input and enables communication with a host computer over the IEEE 488 interface The control head is provided with its own power supply and other than thru the IEEE 488 interface bus is electrically isolated from the amplifier Communication with the amplifier is via fibero
54. ture If either parameter exceeds the setpoint the audible alarm will sound every 30 seconds if configured and a warning message will appear on line 3 of MENU 1 3 9 REV F Model 200 468 Manual Text From WARNINGS 5 MORE brings up WARNINGS 6 which permits setting the maximum helix current Any helix current above this setpoint will result in an audible alarm if configured repeated every 30 seconds and a warning message is displayed on the status line of MENU 1 Pressing MORE again returns display to WARNINGS 1 As before pressing EXIT from any of the warnings screens returns display to MENU 3 Info Screen From MENU 2 52 labeled INFO selects a screen that displays the RF sample port calibration factors at various frequencies across the band In addition this screen displays the model number serial number and firmware revision information that may be required by a service representative when providing technical assistance The EXIT key returns the display to MENU 2 Event Screen From MENU 4 52 labeled EVENT provides a display of events logged by the control system These events include AC power up heater warm up change from standby to operate faults and resets The events are stored in a first in first out FIFO software buffer that has room for 100 events as new events are logged the older ones are discarded System Shutdown Screen In the event of a system shutdown due to a latched fault i e a fault such as
55. w 3 2 6 External interlock connector The TWTA is provided with external interlock capability via a 15 pin female D sub connector J3 To enable the high voltage power supply it is necessary to provide continuity between J3 pins 3 and 4 If the amplifier shuts down because the interlock was opened it will be necessary to reset the system to return to standby see System shutdown screen in Section 3 4 In addition there is an external inhibit capability via the same connector J3 To enable RF ON beam on continuity must be provided between J3 pins 10 and 11 If continuity is broken the TWT beam will shut off until continuity is restored No reset is required to return to RF ON Users may adopt the interlock and inhibit features to disable the HPA for either equipment protection or as a backup for personnel protection N CAUTION Do not rely solely on the external interlock or inhibit features for personnel protection Use proper operating and safety procedures to insure that power is removed as necessary for personnel safety The amplifier has an internal jumper between J3 pins 1 and 2 that may be used by the customer to verify installation of the in the overall system by means of a continuity string 3 5 REV Model 200 468 Manual Text 3 3 Front Panel Features Refer to Figure 3 2 below VEN S iN 2 Pan W P4 t 5 2 N OG 2 N
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