Atec CMX25 Operating And Maintenance Instructions Manual Download Page 29

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Page

REQUEST AMPLIFIER STATUS

(POWER AND METERING)

CODE

Amplifier FUNCTION

POWERFWD

Returns Forward Power Value

POWERRFL

Returns Reflected Power Value

PS1V

Returns Power Supply 1 Volts Value

PS1I

Returns Power Supply 1 Current Value

PS2V

Returns Power Supply 2 Volts Value

PS2I

Returns Power Supply 2 Current Value

TOTALH

Returns Filament Hours Value

OPERATEH

Returns Beam Hours Value

BAND1

Selects Band 1 of Operation [ In Dual Band units only ]

BAND2

Selects Band 2 of Operation [ In Dual Band units only ]

NOLEV

Selects NO Leveling [ Optional ]

INTLEV

Selects INTERNAL Leveling [ Optional ]

EXTLEV

Selects EXTERNAL Leveling [ Optional ]

ZEROATT

Sets the Amplifier for ZERO Attenuation

FULLATT

Sets the Amplifier for FULL Attenuation

GAIN

Returns Gain Value in percentage

*IDN?

Returns ASCII response comprising of four data fields in the format

*RST

Reset Command, Sets the Amplifier to the factory default power up state

NOTES:

1. ALL GPIB COMMANDS AND REQUESTS MUST CONSIST ENTIRELY OF UPPER CASE

ALPHANUMERIC CHARACTERS.

2. WHEN SENDING COMMAND STRINGS TO THE AMPLIFIER, A CARRIAGE RETURN CHARACTER

(0Dh)

FOLLOWED BY A LINE FEED CHARACTER

(0Ah)

, MUST ALWAYS BE APPENDED TO THE

COMMAND, and OTHERWISE THE AMPLIFIER WILL WAIT INDEFINITELY FOR THE

CR-LF

COMBINATION.

Summary of Contents for CMX25

Page 1: ...LIFIER MODEL CMX25 OPERATING AND MAINTENANCE INSTRUCTIONS DOCUMENT NUMBER CMX25MAN 00 SERIAL NUMBER ______________________ Provided by www atecorp com 800 404 ATEC Advanced Test Equipment Corp Rentals Sales Calibration Service ...

Page 2: ...rves 15 5 0 PRINCIPALS OF OPERATION 5 1 Proper Usage And Warnings 16 5 2 Features Of The CMX25 Amplifier 17 5 3 Level Control Board 19 5 4 Optional Features 20 6 0 AUTOMATIC LEVELING CONTROL ALC 6 1 ALC Features 21 6 2 Leveling Using The INT Mode 23 6 3 Leveling Using The EXT Mode 24 7 0 IEEE 488 INTERFACE OPTION 7 1 Introduction 27 7 2 Remote Initialization 27 7 3 Local And Remote Attenuation 27 ...

Page 3: ...MX25 ILLUSTRATION 4 2 0 SYSTEM BLOCK DIAGRAM 7 3 0 CMX25 REAR PANEL ILLUSTRATION 12 4 0 CMX25 SCHEMATIC DIAGRAM 17 5 0 E FIELD LEVELING SET UP 26 LIST OF APPENDICES APPENDIX DESCRIPTION PAGE A CALIBRATION DATA SHEETS AND RESPONSE CURVES 35 B DRAWINGS 36 ...

Page 4: ...ble free operation depends on you thoroughly reading through this manual and familiarizing yourself with its proper operation and usage Your Wide Band Amplifier comes with the following accessories be sure to check your packaging for the items listed below before disposing of the packaging CONTENTS For a typical Wide Band Amplifier Quantity Description 1 CMX25 High Power Wide Band Amplifier P N CM...

Page 5: ...The CMX25 features a Liquid Crystal Display LCD that displays continuous forward and reflected power in four digit metering The display also scrolls to provide the operator with operating status and self diagnostic fault indications The CMX25 has an internal electronic gain control of 40 dB and a built in leveling control which allows the CMX25 to level on an external controlling signal or level i...

Page 6: ...I This warranty shall not apply to any IFI product that has been disassembled modified physically or electrically damaged or any product that has been subjected to conditions exceeding the applicable specifications or ratings IFI shall not be liable for any direct or consequential injury loss or damage incurred through the use or the inability to use any IFI product IFI reserves the right to make ...

Page 7: ...quency range required for operation With the CMX25 in Low Band BAND 1 mode of operation the input RF signal is directed by RF Relays to the Band 1 PA and Driver section which in then to the output With the CMX25 in the High Band BAND 2 mode of operation the input signal is directed by RF Relays to the Band 2 PA and Driver section which in then to the output Both bands utilize only one input and ou...

Page 8: ...present the minimum performance characteristics at the time of delivery SPECIFICATIONS Frequency Response Band One 10 kHz to 250 MHz Band Two 200 MHz to 1000 MHz Bandpass Ripple 2 dB maximum Power Output Minimum 25 Watts 20W min at 1 dB gain compression Power Gain 50 dB minimum Input Impedance Nominal 50 Ohms unbalanced Output Impedance Nominal 50 Ohms unbalanced Input Signal Levels 0 dBm 1 0 mW S...

Page 9: ...f obstructions for proper cooling of the amplifier Operation is restored automatically when the amplifier cools to normal temperature levels 4 5 2 Input Protection The CMX25 is designed to operate with less than a 0 dBm 1 0 mW input signal however to prevent over driving the amplifier the Input Protection circuit will activate if the input signal exceeds 3 dBm 2 0 mW and will automatically compens...

Page 10: ... a tuned 50 Ohm load and should any mismatching of the 50 Ohm occur the Reverse Power also called Reflective Power will increase producing a high VSWR The CMX25 microprocessor monitors the Reverse Power levels by utilizing a Dual Directional Coupler and begins to turn down the gain of the preamplifier when the Reflected Power exceeds 25 The Reverse Power is also displayed on the LCD Display for op...

Page 11: ...dicator is provided within paragraphs 4 6 1 and 4 6 2 CMX25 RF AMPLIFIER Front Panel Rear Panel POWER P S STATUS INDICATOR AC PWR Standard 3 Wire Recept 28 VDC On Led SAMPLE RF OUT BNC Type 12 VDC On Led ALC INPUT BNC Type 5 VDC On Led RF IN N type Optional FAULT Led RF OUT N type Optional LEVEL ADJUST RF Reverse Sample Port Optional GPIB REMOTE Led INTERLOCK BNC Type Optional HI VSWR Led IEEE 488...

Page 12: ...extinguish the 28 VDC supply has shut down When this condition occurs the two cooling fans will slow down to maintain cooling during the power failure and the PS Fault LED will illuminate 12 and 5 LED The 12 and the 5 Green LEDs are provided on both the Power Supply and the Amplifier sections When these LEDs are illuminated the 12 and 5 VDC supplies are functioning properly Should either power sup...

Page 13: ...s condition occurs an error code is stored and displayed on the LCD display of the CMX25 Hi VSWR LED When the Hi VSWR Red LED is illuminated the amplifier is subjected to a condition where the Reflected Power exceeds 25 The microprocessor turns down the gain of the preamplifier and displays the Reverse Power on the LCD Display Band 1 Band 2 LED The Band 1 and Band 2 Red LEDs are status indicators ...

Page 14: ...nd of operation ALC Switch Automatic Leveling Control ALC is a three position switch which selects the method for leveling either internal external or manual Power ON OFF The Power On Off switch is circuit braker that is used as an On Off switch as well as a circuit protection device This switch turns the CMX25 either on or off Level Adjust The Level Adjust control is a ten turn pot which allows a...

Page 15: ...g values were derived by measuring the power output of the amplifier using a calibrated Power Meter and a calibrated 30 dB Attenuator Pad by inducing an appropriate input signal level to obtain a 25 Watt output Once the appropriate signal level has been determined to obtain the 25 Watt power level the actual Front Panel Metering Indication that correlates to the calibrated 25 Watt indication was r...

Page 16: ...tection circuits to maintain proper gain control IFI makes available with each shipped amplifier specific data and curves so the operator will know the proper input signal levels to more efficiently operate the amplifier refer to Paragraph 4 7 herein 5 1 3 Band Switching Cautions The CMX25 amplifier incorporates two bands with one input and output connector Switching between bands is accomplished ...

Page 17: ... CMX25 amplifies a input signal source over the frequency range from 10 kHz to 1000 MHz and at a minimum gain of 50 dB The operational description of each frequency band is identified in Paragraph 5 2 1 and 5 2 2 refer to Figure 4 0 CMX25 Schematic Diagram for an illustration of the CMX25 circuitry FIGURE 4 0 CMX25 SCHEMATIC DIAGRAM 5 2 1 Band 1 Band 1 is designed for operation between 0 01 to 230...

Page 18: ...he main power supply 5 2 1 2 Power Amplifier This amplifier consists of three amplification sections the final stage having two cascaded high power push pull devices operating in parallel and combined through a transmission type impedance transformer 5 2 2 Band 2 5 2 2 1 Preamplifier Attenuator Same amplifier as 5 2 1 1 5 2 2 2 Driver Amplifier This amplifier module consists of three cascaded sing...

Page 19: ...evel Control Manual level control is accomplished by adjusting the front panel ten turn potentiometer located on the power supply control unit to a reference voltage setting between 0 to 5 volts 5 3 2 Automatic Level Control In this mode the CMX25 serves as the voltage comparator and variable gain stage It will enable the maintaining of a constant RF voltage vs frequency at the input to an imperfe...

Page 20: ...will light whenever the Auto Limit is acting to limit RF drive To determine whether the Auto Limit Feature is included in the operator s CMX25 The Auto Limit feature can be identified by a Auto Limit BNC Connector located on the rear panel of the CMX25 Power Supply Control Module The lack of the BNC connector means that this option has not been installed however should the operator desire this opt...

Page 21: ...ut signal gain frequency and power output As a result the operator must be fully knowledgeable of the effects of these variables in relationship to the operating characteristics of the amplifier With this in mind the two most important factors are the dB flatness of the amplifier over the operating frequency range and the rated output power of the amplifier Depending on the response curve provided...

Page 22: ...eference input from the front panel Level Control and the input from the aforementioned detected voltage or E Field The total gain of the leveling loop serves to maintain the output of the comparator virtually constant and thus maintain the desired test level at the remote detector or remote E Field sensor The EXT position enables the amplifier to automatically control an operator determined power...

Page 23: ...ets provided within Appendix A It is important to determine that sufficient signal drive signal is generated to obtain and maintain the desired programmed power level An adequate load capable to operate within the power requirements should also be selected 4 Adjust the RF Level Potentiometer until the desired Forward Power Level is displayed on the front panel LCD display 5 The amplifier is now re...

Page 24: ...onstant RF drive voltage over the entire frequency range Full leveling at half the CMX25 rated output power is realizable with most reasonable load variations Extremely mismatched loads particularly those presenting near short circuit conditions to the amplifier will reduce the maximum voltage leveling capability of the system Load impedance variation from 50 Ohms to an open circuit will permit pe...

Page 25: ...o Figure 3 0 CMX25 Rear Panel Illustration for location of the ALC Input 4 Connect a Light Pipe to the Input of the Light Demodulator Indicator IFI P N LDI and to the LMT output of an IFI E Field Sensor Leveling Procedure 1 Turn on all equipment shown in Figure 5 0 and allow a three minute warm up period 2 Turn the RF Level Adjust fully clockwise to the maximum gain setting and set the tracking of...

Page 26: ...on will also determine the proper sweep or step rate 7 Electric Null Fields or E Null Fields are a phenomena that may be observed when performing a sweep test In a typical EMI EMC Set Up where an amplifier and a frequency generator are used to generate an E Field a E Null Field can be noted when the generated E Field is swept through a frequency range and at certain frequencies the field level wil...

Page 27: ... manual local operation 7 3 GPIB ADDRESS The GPIB address of the amplifier is set by via the Front panel using the Control knob at the start up menu NOTES ON USING NATIONAL INSTRUMENTS GPIB CONTROLLERS In order for the amplifier to operate correctly with a National Instruments GPIB controller card the following must be done Items 1 5 are done in the IBCONF program 1 Set Terminate reads on EOS to y...

Page 28: ...r Function STBY Standby OPRT Operate RESET Fault Reset ATTU Increase Attenuation Response with Gain value optional ATTD Decrease Attenuation Response with Gain value optional REQUEST STATUS Code AMPLIFIER STATUS STATUS STANDBY OPERATE FAULT FAULT DETIALED MESSAGE ...

Page 29: ...EV Selects INTERNAL Leveling Optional EXTLEV Selects EXTERNAL Leveling Optional ZEROATT Sets the Amplifier for ZERO Attenuation FULLATT Sets the Amplifier for FULL Attenuation GAIN Returns Gain Value in percentage IDN Returns ASCII response comprising of four data fields in the format Manufacturer Model Serial Number Firmware Version RST Reset Command Sets the Amplifier to the factory default powe...

Page 30: ...ng be required refer to Paragraph 8 3 8 3 EQUIPMENT RETURN PROCEDURE Should such an event arise that the CMX25 requires repair or calibration it is recommended that the reader follows the Equipment Return Procedure so the equipment can be repaired or calibrated and returned in a efficient and timely manner 8 3 1 Request a RMA Number Contact the IFI Service Department either in writing or by callin...

Page 31: ...the accessories with the equipment It is also IFI s policy to verify performance of all associated accessories of Section 1 0 before returning the equipment to service 8 1 3 Packaging The Equipment When returning equipment to the manufacturer always wrap each accessory separately and provide sufficient protective material around each item to prevent damage from handling and shipping conditions 8 3...

Page 32: ...Page 32 APPENDIX A CALIBRATION DATA SHEETS AND RESPONSE CURVES ...

Page 33: ...MX25 INTERCONNECT DIAGRAM CMX25 BOM 100216 ATTENUATOR PRE AMPL ASSEMBLY DRAWING 500469 1 SCHEMATIC 700259 3 SPLITTER DETECTOR ASSEMBLY 500515 DRIVER SCHEMATIC 500466 SCHEMATIC POWER VSWR METERING BOARD 500516 SCHEMATIC HB DUAL PA IPA ...

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