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Rev D

4. MAINTENANCE

4.1 GENERAL MAINTENANCE INFORMATION

The Model 250S1G6 requires very little maintenance since it is a relatively simple instrument. It is built with

etched circuit wiring and solid state devices that will ensure long, trouble free life. However, should trouble

occur special care must be taken in servicing to avoid damage to the devices or the etched circuit board.

Since the components are soldered in place, substitution of components should not be resorted to unless there

is some indication that they are faulty. In addition, take care when troubleshooting, not to short voltages

across the amplifier. Small bias changes may ruin the amplifier due to excessive dissipation or transients.

Components in AR instruments are conservatively operated to provide maximum instrument reliability. In

spite of this, parts within an instrument may fail. Usually, the instrument must be immediately repaired with a

minimum of down time. A systematic approach can greatly simplify and, thereby, speed up the repair.

However, due to the importance of the amplifier's alignment, it is recommended that when failure is caused by

breakdown of any of the components in the signal circuits, the amplifier be returned to the factory for part

replacement and amplifier realignment. Shipping instructions are as follows.

To return an item, contact AR Customer Service for an RMA number and shipping instructions. Returns from

outside the United States are not permitted without prior authorization. If shipping from outside of the United

States, closely follow all directions on the RMA form for return shipping and marking. See warranty

statement at rear of manual.

4.2 DISASSEMBLY PROCEDURE

CAUTION:

Extreme caution should be exercised when troubleshooting this unit,

particularly when measuring voltages in the power supply section of the

unit. Hazardous voltages do exist in the unit that could cause serious

injury to any personnel performing the measurements.

The amplifier can be removed from the housing by removing screws from the front panel and from the rear

securing brackets. The amplifier can then be slid from the housing. The top cover can be removed to gain

access to the low level RF assemblies. The power supplies, power combiner and remote interfaces are

accessible by removing the bottom cover.

The RF final quad amplifiers are accessible by removing the side covers.

Содержание 10041451

Страница 1: ...EXPORT CONTROLLED DATA These commodities technology or software are controlled for export in accordance with the U S Export Administration Regulations Diversion contrary to U S law is prohibited 160 School House Road Souderton PA 18964 215 723 8181 Fax 866 859 0582 www arworld us ...

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Страница 3: ...y Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part 1 General Requirements UL 61010 1 Issued 2012 05 11 Ed 3 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part 1 General Requirements CAN CSA C22 2 61010 1 Issued 2012 05 11 Ed 3 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part 1...

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Страница 5: ...en Minimalwerte der Schirmdämpfung und Filterung in den unterschiedlichen Leistungsklassen empfohlen Hochfrequenzleistung min Schirmdämpfung 100 Watt 50 dB 101 1000 Watt 60 dB 1001 10 000 Watt 70 dB Falls andere elektrische oder elektronische Geräte gleichzeitig mit dem Gerät betrieben werden kann es zu Beeinflussungen kommen Da das Gerät zur Erzeugung von Hochfrequenzenergie dient ist es daher au...

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Страница 7: ... clearance on all vented sides of the equipment to permit the airflow required for proper ventilation Do not restrict airflow into the equipment by blocking any vents or air intakes Restricting airflow can result in damage to the equipment intermittent shut downs or safety hazards Keep equipment away from extremely hot or cold temperatures to ensure that it is used within the specified operating r...

Страница 8: ...na assembly may be heavy requiring two persons to lift Use caution when installing or removing unit Follow all equipment setup and lifting instructions specified in this document Ensure connectors are appropriate for intended operation Connectors are specified in the user manual and product specification sheet Do not exceed the maximum RF input level stated in the specifications Refer to the user ...

Страница 9: ...von 10 2 cm 4 in auf allen belüfteten Seiten des Geräts ein um eine ausreichende Luftzirkulation zu gewährleisten Beinträchtigen Sie den Luftstrom des Geräts nicht indem Sie Lüftungsöffnungen oder den Lufteinlass blockieren Wird der Luftstrom eingeschränkt kann dies zu Schäden am Gerät periodischen Abschaltungen und anderen Gefahren führen Halten Sie das Gerät von extrem heißen oder kalten Tempera...

Страница 10: ...n in diesem Dokument angegebenen Anweisungen zur Anbringung Stellen Sie sicher dass alle Anschlüsse für den beabsichtigten Betrieb geeignet sind Informationen zu den Anschlüssen erhalten Sie im Benutzerhandbuch und im Produktspezifikationsblatt Überschreiten Sie nicht den in Spezifikationen angegebenen maximalen HF Eingangspegel Informationen zum geeigneten HF Pegel erhalten Sie im Benutzerhandbuc...

Страница 11: ...imitez pas le flux d air allant dans l équipement en bloquant tout évent ou entrée d air La restriction du flux d air peut endommager l équipement causer des coupures intermittentes ou des dangers pour la sécurité Tenez l équipement à l écart de températures extrêmement chaudes ou froides pour veiller à ce qu il soit utilisé dans la plage de fonctionnement indiquée Lorsque vous installez des acces...

Страница 12: ...z prudent lorsque vous installez ou retirez l unité Respectez toutes les instructions concernant l installation et le levage de l équipement indiquées dans ce document Assurez vous que les connecteurs sont appropriés pour l utilisation prévue Les connecteurs sont indiqués dans le manuel d utilisation et la fiche signalétique du produit Ne dépassez pas le niveau d entrée RF maximal indiqué dans les...

Страница 13: ...g is voor goede ventilatie mogelijk te maken Belemmer de luchtstroom in het apparaat niet door ventilatieopeningen of luchtinlaten te blokkeren Het belemmeren van de luchtstroom kan leiden tot schade aan het apparaat onregelmatige uitvallen of veiligheidsrisico s Houd het apparaat uit de buurt van extreem hoge of lage temperaturen om ervoor te zorgen dat het apparaat binnen het gespecificeerde wer...

Страница 14: ...instellen en optillen van de apparatuur die in dit document worden vermeld Zorg ervoor dat de connectoren geschikt zijn voor de beoogde werking De connectoren worden gespecificeerd in de gebruikershandleiding en in het productspecificatieblad Overschrijd het maximale RF ingangsniveau niet dat in de specificaties is vermeld Raadpleeg de gebruikershandleiding en het productspecificatieblad om de toe...

Страница 15: ...es 10 2 4 4 Safety Interlock Connector 10 2 5 Amplifier Operation 11 2 5 1 Local Operation 11 2 6 Remote OPERATION 11 2 6 1 IEEE 488 GPIB Communication 11 2 6 2 RS 232 Communication 12 2 6 3 Fiber Optic Serial Communication 13 2 6 4 USB Communication 13 2 6 5 Ethernet Communication 14 2 6 6 Remote Commands 14 3 THEORY OF OPERATION 25 3 1 Introduction 25 3 2 RF Amplifier Operation 25 3 2 1 A1 Pre A...

Страница 16: ...0034514 32 4 3 7 ALC Fault 33 4 3 8 Low or No Power Output DC Tests Schematic Diagram No 10034514 33 4 3 9 Low or No Power Output RF Test Schematic Diagram No 10034514 34 FIGURES 2 1 Digital Control Panel DCP Features 8 2 2 Rear Panel Features 9 2 3 Touch Panel Display Menu Map 11 4 1 Typical Response at 0 dBm Input 36 4 2 Typical Response at 20 dBm Input 36 4 3 Typical Response Input A3 Front Pan...

Страница 17: ...uding adjustment of the amplifier s RF Gain during CW mode operation and provides graphical displays of the amplifier s Forward and Reflected power levels RF output level protection A General Purpose Interface Bus GPIB IEEE 488 2 interface for remote control of the amplifier s operating functions RS232 serial communications including both wire and fiber optic ports for remote control USB Communica...

Страница 18: ...utput amplifier subassemblies are thermally monitored The digital control panel monitors all fault signals stores and displays any that are invoked and asserts the required action 1 5 INSTALLATION Before proceeding thoroughly inspect the amplifier for signs of physical damage that may have been incurred during shipment and completely read the following installation and operating instructions payin...

Страница 19: ...roadband amplifier designed for applications where in stantaneous bandwidth high gain and linearity are required Housed in a stylish contempo rary cabinet the unit is designed for benchtop use but can be removed from the cabinet for immediate equipment rack mounting The 250S1G6 when used with a sweep genera tor will provide a minimum of 250 watts of RF power Included is a front panel gain control ...

Страница 20: ...male REMOTE INTERFACES IEEE 488 24 pin RS 232 9 pin Subminiature D RS 232 fiber optic Type ST USB 2 0 Type B Ethernet RJ 45 SAFETY INTERLOCK 15 pin Subminiature D COOLING Forced air self contained fans EXPORT CLASSIFICATION 3A001 Page 2 Specifications 250S1G6 M1 M5 250 Watts CW 0 7 6GHz Model Configurations To order AR Products call 215 723 8181 For an applications engineer call 800 933 8181 Direc...

Страница 21: ...se oscillations that may permanently damage the unit s input transistors The 250S1G6 Amplifier is protected from input overdrive by an automatic level control circuit which will limit the maximum RF level to the first gain stage U2 of the RF Amplifier to approximately 0 dBm NOTE The amplifier requires 30 minutes of warm up time to avoid any gain or power drift The 250S1G6 RF power transistors are ...

Страница 22: ... active as long as the main power circuit breaker of the amplifier power entry module is on 1 4 2 3 5 6 Figure 2 1 Digital Control Panel DCP Features Item Title Function 1 INHIBIT LOCAL REMOTE Keylock Switch 3 position key removal in INHIBIT position only 2 POWER POWER control with indicator LED 3 DISPLAY TOUCH SCREEN Numerous parameter values and fault messages plus manual input control 4 ADJUST ...

Страница 23: ...rlock Type 13 pin sub D 4 IEEE 488 Remote Interface 5 RS 232 Remote Interface 6 USB Remote Interface 7 Fiber Optic Serial Remote Interface 8 Ethernet Remote Interface 2 2 4 RF ON OFF The RF ON OFF touch screen button toggles the amplifier from a Standby to an Operate mode The status of the function is indicated on the display as RF ON or RF OFF In the RF ON state RF output is enabled according to ...

Страница 24: ...auses the power amplifier sections to produce RF output power from the output connector based on the various settings and the input level to the amplifier To the far right is an ADJUST knob This knob is used to adjust many of the variables shown on the graphic touch display The graphic touch display is active and illuminated whenever AC power is supplied to the unit and the main circuit breaker is...

Страница 25: ...Model 250S1G6 Rev D 9 Figure 2 3 Touch Panel Display Menu Map Values shown on screens are for illustration only ...

Страница 26: ...o not connect or disconnect any loads or cables from the amplifier s RF Output when the amplifier is in the Operate mode Dangerous voltages that could cause serious injury to the user exist at the RF Output when the amplifier is under power 2 4 3 IEEE 488 USB and RS 232 Interfaces The Model 250S1G6 s remote interfaces allow remote control via a computer of all amplifier functions except for the Ke...

Страница 27: ...ont panel controls or neither depending on its position All remote queries will work in any switch position All remote commands will only work when the switch is set to REMOTE When the switch is set to REMOTE all front panel controls are disabled However faults can be reset locally by way of the Reset button displayed on the touch screen regardless of Keylock switch position The REMOTE LOCAL INHIB...

Страница 28: ...onds At this time the internal buffer is cleared and a TIMEOUT_ERROR message followed by a Line Feed character is sent out from this port The baud rate for the RS 232 port is user selectable from the RS 232 Fiber Optic Serial Baud Rate selection screen To get there from the Main Menu touch the User menu button followed by the I O menu button and finally the Serial menu button A thin black outline ...

Страница 29: ... optimized to work with light at a wavelength of 820nm For more detailed specifications on this port consult the Avago HFBR series datasheet found at www avagotech com A glass multi mode fiber optic cable of 200um is recommended however fiber optic cable as small as 50um can be used The connector type for this port is ST This port can be used in conjunction with either an AR model IF7000 RS 232 to...

Страница 30: ...tronix com For assistance using this utility please consult the utilities embedded help file The DeviceInstallerTM utility will scan the network and find all connected Lantronix Ethernet devices This list of found devices will include any connected AR Ethernet devices By selecting one of the connected devices from the list its IP address and subnet mask can be changed along with a number of other ...

Страница 31: ... status just prior to issuing a command since the status could have been changed by a fault condition or by operator actions Variables represented by wild card characters i e x y z etc do not indicate or delimit the number of characters actually specified Table 2 4 Relationship between DCP Controls and Remote Communication AC Power and Circuit Breaker Power Keylock Switch Remote Communication On O...

Страница 32: ...all faults if possible Syntax RESET Parameters None Response Format None No query for this command Example To clear any faults send the following command RESET LF 2 6 6 4 Mode Select This command sets the ALC mode of the amplifier Syntax MODE x Parameters Mode x MANUAL Set to Manual mode PULSE Set to Pulse mode ALC space INT Set to ALC Internal mode ALC space EXT Set to ALC External mode Response ...

Страница 33: ... RF Gain ALC Detector Gain and ALC Threshold 0 Minimum 100 Maximum For ALC Response Time 0 Minimum 7 Maximum Response Time Setting Time mS 0 1 1 5 2 10 3 30 4 100 5 1000 6 3000 7 3000 Response Format None No query for this command Example To set the RF Gain to minimum send the following command LEVEL GAIN0 LF To set the RF Gain to 50 send the following command LEVEL GAIN50 LF To set the ALC Respon...

Страница 34: ...dentity of the amplifier send the following command IDN LF Response AR RF MICROWAVE INST MODEL 1 0 LF 2 6 6 7 IO Board Firmware Revision Query to get the firmware revision of the I O Board Syntax IOB Parameters None Query only always requires a character Response Format INTERFACE_BOARD_SW_REVx LF Where x firmware revision Example To get the firmware rev of the I O Board send the following command ...

Страница 35: ...pace GAIN x THRES x RESP y LF Value x For RF Gain Detector Gain and ALC Threshold 0 Minimum 100 Maximum Value y For Response Time 0 Minimum 7 Maximum Response Time Setting Time mS 0 1 1 5 2 10 3 30 4 100 5 1000 6 3000 7 3000 Example To get the machine state send the following command MSB LF Response RF space GAIN 100 DT space GAIN 50 THRES 75 RESP 1 LF RF gain is 100 Detector Gain is 50 ALC Thresh...

Страница 36: ... be found in the table below NOTE Bits labeled NOT USED may be read as a bit state of 1 or 0 BIT STATE BIT POSITION BIT DESCRIPTION 0 1 NOTES x 0 PULSE STATUS OFF PULSE 1 NOT USED 2 NOT USED 3 REMOTE CONTROL DISABLED ENABLED Response to key switch position y 0 POWER STATUS OFF POWER ON 1 STANDBY STATUS OFF STANDBY Also known as RF OFF 2 OPERATE STATUS OFF OPERATE Also known as RF ON 3 FAULT STATUS...

Страница 37: ... zeros are read as spaces Units are Watts Example To find out the forward power send the following query FPOW LF Response FPOW space space space 54 LF 54 Watts of forward power 2 6 6 11 Reverse Power Query to get the reverse power Syntax RPOW Parameters None Response Format RPOW x LF Where x 0 to 99999 Values are corrected and linearized They can be up to five digits in length Leading zeros are re...

Страница 38: ...yntax FSTA Parameters None Response Format FSTA space 00xx Where xx 00 to 1A Hexadecimal xx Dec Description 00 0 No Fault 01 1 unused 02 2 Interlock 03 3 PS1 04 4 Left Bottom Thermal 05 5 Left Top Thermal 06 6 Thermal Driver 07 7 PS3 08 8 PS2 0C 12 Right Bottom Thermal 0D 13 Right Top Thermal 11 17 Fan Fault 12 18 Amp Right Bottom 13 19 Amp Right Top 14 20 Amp Left Bottom 15 21 Amp Left Top 16 22 ...

Страница 39: ...wing query OH LF Response OH space space space space 37 LF The system has spent 37 Hours in an RF On state 2 6 6 15 Operating Hours Power On Query to get the Power On operating hours Syntax OHP Parameters None Response Format OHP x LF Where x 0 to 100000 Units are Hours Values can be up to six digits in length Leading zeros are read as spaces Example To find out the Power On operating hours send t...

Страница 40: ...EXT Not available on all models NOTES 1 Use the command DEFAULT FACTORY to reset all applicable settings back to their factory defaults 2 All applicable defaults can be queried except DEFAULT FACTORY by adding a character in place of the setting parameter 3 If the ALC Lockout Feature not available on all models is engaged the default ALC values set with this command will not be used Example 1 To s...

Страница 41: ...dBm by utilizing internal voltages U2 is a broadband GaAs Monolithic Microwave Integrated Circuit MMIC and is the first stage of gain in the amplifier The output of U2 is fed to the input of the Wilkinson Two Way Splitter The Wilkinson Two Way Splitter splits the signal into two paths One output is fed to the input of the A2 Driver Amp and the other output is fed to a detector The detector output ...

Страница 42: ...ximately 3 0A from a 24 5V supply Logic low voltage on the fault pin indicates a low or high current condition exists on GaN FET 1 bottom or FET 2 top 3 2 3 A12 through A27 Output Power Amplifiers Schematic 10036226 10028316 10033603 The output power amplifiers are identical in construction and performance to the driver amplifiers described in 3 2 2 3 2 4 A3 A8 through A11 Four Way Splitter The Fo...

Страница 43: ...power supply is fed to the A2 Driver and the A4 A7 Drivers to supply the FET drain voltage for these amplifiers and the A31 regulator assembly where it is regulated to a switched 15 V supply for amp A1 The 24 V at 2 amps power supply is regulated to 12 V and 5 V through the A31 regulator board PS2 and PS3 supply 24 5 VDC at 20 amps each PS2 and PS3 are switching power supplies that automatically s...

Страница 44: ... tolerant 24 Analog outputs 2 Mixed signal inputs 4 2 channel encoder input 1 Inputs for a keypad 6 Display connectors 1 Serial communication jacks 2 3 4 2 A39 Interface Board Schematic 10020073 3 4 3 A37 ALC Board Schematic 10023927 This section describes the operation of the level control board The level control board performs the following functions Provides automatic level control of the ampli...

Страница 45: ...recommended that when failure is caused by breakdown of any of the components in the signal circuits the amplifier be returned to the factory for part replacement and amplifier realignment Shipping instructions are as follows To return an item contact AR Customer Service for an RMA number and shipping instructions Returns from outside the United States are not permitted without prior authorization...

Страница 46: ...ic Discharge ESD approved workstations by individuals who are familiar with the handling of microwave GaN HEMTs and other ESD sensitive devices Troubleshooting the Model 250S1G6 in a logical manner can speed the solution to a problem The settings of potentiometers pots capacitors caps or other variables should not be disturbed until other problems have been eliminated Comparing the measured DC vol...

Страница 47: ...er this could indicate that the output coax cable is defective or that the load being driven has a high VSWR 4 3 2 The Unit Cannot Be Operated Remotely 1 Verify that the front panel keyswitch is set to the REMOTE position 2 Verify that the unit operates locally by setting the keyswitch to the LOCAL position if the unit does not operate locally see 4 3 1 of this manual 3 Check the position of the A...

Страница 48: ...age on A1 J13 pin 30 it should be 0 1V 6 If the voltage on A1 J13 pin 30 is high check the interlock line to ground 4 3 5 Power Supply Faults Schematic Diagram No 10034514 4 3 5 1 PS1 Fault DC OK The PS1 power supply has a DC OK output which is normally high 4 0V to the A1J13 pin 29 If any of the PS1 outputs fail this output will go low 0 1V and inhibit the A2 Driver Module 4 3 5 2 PS2 and PS3 Fau...

Страница 49: ...mplitude and frequency 3 Check the RF output connection from the unit is it correctly connected to the load Is the coaxial cable okay 4 Check the following voltages on the Power Supply If any of the voltages are out of tolerance correct them before further troubleshooting PS1 C Module 24 5 V 0 5 V PS1 DB Module Channel 1 24 V 0 5 V PS1 DB Module Channel 2 24 V 0 5 V PS2 24 5 V 0 5 V PS3 24 5 V 0 5...

Страница 50: ... 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 Gain dB Frequency GHz 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 Gain dB Frequency GHz Figure 4 1 Typical Response at 0 dBm Input Figure 4 2 Typical Response at 20 dBm Input Phase matching must be maintained from the input of the A3 Four Way Splitter to the inputs of the A29 Sixteen Way Combiner i...

Страница 51: ...4 3 Typical Response Input A3 Front Panel RF Output If the response is normal see Step 8 If the response is abnormal perform the following tests 3 If the gain is slightly low i e several dB below typical try disconnecting the inputs from the A12 through A27 Quad Amps one at a time then reconnect them Note the difference in response when disconnecting the Quad Amps if any Quad Amp causes less of a ...

Страница 52: ...e similar If not check the side that made the least difference Check the Four Way Splitter the Quad Amp and so forth Repeat for A6 and A7 5 A typical Four Way Splitter Insertion Loss is shown in Figure 4 5 The unused port must be terminated when checking the insertion loss 30 20 10 0 10 20 30 40 50 9 5 9 0 8 5 8 0 7 5 7 0 6 5 6 0 5 5 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 Return Loss ...

Страница 53: ...etter than 17dB see Figure 4 6 Figure 4 6 Typical Sixteen Way Combiner Insertion and Return Loss Combined Output Port 7 If the response of the output stages i e A4 Four Way Splitter input to front panel RF output is normal check the response of the A3 Quad Amp see Figure 4 7 Figure 4 7 Typical Quad Amp Response NOTE The A2 Driver amplifier and the A1 Preamplifier s response may differ considerably...

Страница 54: ...nse for the A1 Preamplifier at maximum gain setting is shown in Figure 4 8 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 Gain dB Frequency GHz Figure 4 8 Typical A1 Preamplifier Response ...

Страница 55: ... cover If the security label is removed and or cut the warranty of the module will be voided Vacuum tubes in the L series amplifiers traveling wave tubes in TWT amplifiers and power heads will be free from defects in material and workmanship for a period of one 1 year Contact AR RF Microwave Instrumentation for warranty information regarding items not listed Seller s sole responsibility in fulfill...

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