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Related Manuals for Atec CMX25
Summary of Contents for Atec CMX25
- Page 1 Advanced Test www.atecorp.com ® Provided by: Equipment Corp. (800) 404-ATEC Rentals • Sales • Calibration • Service HIGH POWER WIDE BAND AMPLIFIER MODEL CMX25 OPERATING AND MAINTENANCE INSTRUCTIONS DOCUMENT NUMBER CMX25MAN-00 SERIAL NUMBER ______________________...
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Page 2: Table Of Contents
Status Indicators, Controls and Connectors ......11 Data Sheets And Curves ............15 PRINCIPALS OF OPERATION Proper Usage And Warnings ............ 16 Features Of The CMX25 Amplifier .......... 17 Level Control Board ..............19 Optional Features ..............20 AUTOMATIC LEVELING CONTROL (ALC ) ALC Features ................ - Page 3 LIST OF FIGURES FIGURE DESCRIPTION PAGE CMX25 ILLUSTRATION..............4 SYSTEM BLOCK DIAGRAM .............. 7 CMX25 REAR PANEL ILLUSTRATION .......... 12 CMX25 SCHEMATIC DIAGRAM ............. 17 ‘E’ FIELD LEVELING SET-UP ............26 LIST OF APPENDICES APPENDIX DESCRIPTION PAGE CALIBRATION DATA SHEETS AND RESPONSE CURVES ..35 DRAWINGS ..................
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Page 4: Introduction
CONTENTS ( For a typical Wide Band Amplifier ) Quantity Description CMX25 High Power Wide Band Amplifier, P/N CMX25 A/C Line Cord Operation and Instruction Manual, Doc. No. CMX25MAN Calibration Data Sheets and Response Curves (Included in Manual ) FIGURE 1.0... -
Page 5: General Description
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 internally by an operator determined the Automatic leveling Control ( ALC ) setting. -
Page 6: Warranty Information
SECTION 3.0 WARRANTY INFORMATION Instruments For Industry, Inc. (IFI) warrants each product of its manufacture to be free from any defect in material and workmanship for a period of one year from shipment to the original purchaser. All warranty returns, however, must first be authorized by our factory office representative. -
Page 7: General Information
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 output connector with the signal routed internally by RF Relays. -
Page 8: General Operation With System 55
SYSTEM 55 is an IBM Compatible, Windows based proprietary EMC susceptibility program specially designed to integrate the CMX25 with other IFI equipment into an efficient and flexible automated EMC Testing System for immunity testing. It is capable for IEC801-3 testing as well as a real time leveled sweep that maintains a desired preset field level across a given frequency range. -
Page 9: Protection Circuits
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 compensate for the increased input signal by... - Page 10 28 VDC supply. 4.5.5 Mismatch Protection The CMX25 is designed to operate with 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.
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Page 11: Status Indicators, Controls And Connectors
4.6 STATUS INDICATORS, CONTROLS AND CONNECTORS The CMX25 has various controls and status indicators which are identified below and can be visually located on Figure 1.0, CMX25 Illustration and Figure 3.0, CMX25 Rear Panel Illustration. A narrative description for the function and purpose of each control and status indicator is provided within paragraphs 4.6.1 and 4.6.2. -
Page 12: Cmx25 Rear Panel Illustration
FIGURE 3.0 CMX25 REAR PANEL ILLUSTRATION 4.6.1 CMX25 PANEL STATUS INDICATORS INDICATOR FUNCTION + 28 LED The + 28 Green LED is provided on both the Power Supply and Amplifier sections. When these LEDs are illuminated, the + 28 VDC supply is functioning properly. When these LEDs extinguish, the +28 VDC supply has shut down. - Page 13 A Module Fault occurs when an anomaly was detected by the microprocessor. When this 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%.
- Page 14 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 minimum of a 40 dB range of gain.
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Page 15: Data Sheets And Curves
4.7 DATA SHEETS AND CURVES Provided with each CMX25 are specific Calibration Data Sheets and Flatness Curves measured from the amplifier using a calibrated 50 Ohm Pad to assist the operator in maximizing the performance of the Wide Band Amplifier. -
Page 16: Principals Of Operation
Output power is usually measured with a power meter and suitable power attenuators. 5.1.2 Input Signal Levels 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 compensate for the increased input signal by... -
Page 17: Features Of The Cmx25 Amplifier
Watts, over a wide range of frequencies, without tuning adjustments. Through the utilization of two frequency bands identified as Band 1 and Band 2, the CMX25 amplifies a input signal source over the frequency range from 10 kHz to 1000 MHz and at a minimum gain of 50 dB. - Page 18 This module is both a preamplifier and a voltage controlled, broad band attenuator. It provides the CMX25 with remote level control and leveling capability over the entire 0.01 to 1000 MHz frequency range. With the front panel level control set at maximum output it has a nominal 7 dB gain and can be adjusted with the front panel level control over a greater than 40 dB range.
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Page 19: Level Control Board
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 imperfect load or a virtually constant E-Field at a measurement point in space. -
Page 20: Optional Features
5.4.1 Automatic Drive Limit Function ( Auto Limit ) The Auto Limit is an optional feature that can be used when the CMX25 is used as a driver for higher power amplifiers available from IFI. The IFI series of high power amplifiers have provisions for continuously sampling plate and screen currents for front panel metering and to establish current limits which the amplifier will not be permitted to exceed. -
Page 21: Automatic Leveling Control (Alc )
SECTION 6.0 AUTOMATIC LEVELING CONTROL (ALC ) 6.1 ALC FEATURES The Automatic Leveling Control ( ALC ) switch located on the front panel has three positions, 'INT', 'OFF' and 'EXT'. Described below are the features of each position 6.1.1 The 'INT' Position The 'INT' or Internal position enables the amplifier to automatically level on an RF power level selected by an operator displayed on the Forward Power reading located on the Front Panel LCD display. - Page 22 6.1.3 The 'EXT' or External Position 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 imperfect load or a virtually constant E-Field at a measurement point in space.
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Page 23: Leveling Using The "Int' Mode
6.2 LEVELING USING THE 'INT' MODE When in the INT position, no outside controls are required, the only equipment required is a frequency generator and the intended load. The procedure to use Internal ( 'INT' ) Leveling is described below: 1) Turn the RF Level Potentiometer fully counter clockwise to Full Attenuation. -
Page 24: Leveling Using The 'Ext' Mode
Connect the ALC on the rear panel to the detected output port on the remote detector. Connect the remote detector in series with the CMX25 output and at the input to the load. The system is now ready for operation. Amplitude adjustments can be made with the level control as in manual operation. - Page 25 2) Connect the RF Output of the CMX25, located on the same panel as the RF Input connector, to the antenna. 3) Connect the ALC Input, located in the rear panel of the CMX25, to the output of the Light Demodulator Indicator, IFI P/N LDI. Refer to Figure 3.0, CMX25 Rear Panel Illustration, for location of the ALC Input.
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Page 26: E-Field Leveling Set-Up
6) The system is now ready to be tested with a swept analog or stepped frequency input signal. All IFI component blocks shown in Figure 5.0 are capable of operating continuously from 10 kHz to 220 MHz. Extended frequency coverage, over the full range of the unit, can be provided by substituting an EFS-5 for the EFS-1 and adding a second log periodic or ridged horn antenna. -
Page 27: Ieee-488 Interface Option
SECTION 7.0 IEEE-488.2 INTERFACE 7.1 INTRODUCTION The Instruments For Industry, Inc. (IFI) Amplifiers can be operated remotely from a personal computer having an IEEE-488 interface. This interface allows the amplifier to be remotely controlled over the General Purpose Interface Bus (GPIB) by sending commands to the amplifier. Additionally, amplifier status and forward and reverse power readings may be read over the GPIB. -
Page 28: Status Commands
IEEE Commands for Solid State Amplifier Code Amplifier 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 28... - Page 29 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...
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Page 30: Maintenance And Servicing
Should servicing 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. - Page 31 8.1.2 Return All Accessories In the interest of saving time and expediting the repair or calibration process, return all the associated accessories described in Section 1.0 when returning the equipment for repair or calibration. In many cases, a faulty accessory could give an illusion that the equipment itself has failed. For this reason it is important to return the all the accessories with the equipment.
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Page 32: Calibration Data Sheets And Response Curves
APPENDIX A CALIBRATION DATA SHEETS RESPONSE CURVES Page 32... - Page 33 APPENDIX A SCHEMATICS CMX25 INTERCONNECT DIAGRAM CMX25 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 Page 33...
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