Atec CMX25 Manual
Page
2
TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
1.0 INTRODUCTION ..................................................................................4
2.0 GENERAL DESCRIPTION...................................................................5
3.0 WARRANTY INFORMATION ............................................................ 6
4.0 GENERAL INFORMATION
4.1 Scope Of This Manual ................................................................ 7
4.2 Operation Overview....................................................................7
4.3 General Operation with System 55............................................. 8
4.4 General Specifications ................................................................8
4.5 Protection Circuits ......................................................................9
4.6 Status Indicators, Controls and Connectors.............................. 11
4.7 Data Sheets And Curves ........................................................... 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
7.6 Status Commands......................................................................28
7.7 GPIB Address ........................................................................... 29
8.0 MAINTENANCE AND SERVICING
8.1 Periodic Maintenance................................................................ 33
8.2 Servicing The Amplifier ...........................................................33
8.3 Equipment Return Procedure....................................................33
Page
3
LIST OF FIGURES
FIGURE DESCRIPTION PAGE
1.0 CMX25 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
SECTION 1.0
INTRODUCTION
Congratulations on the purchase of your new Wide Band Amplifier from Instruments For
Industry, Inc. Your new Wide Band Amplifier incorporates the finest advancements in the state
of the art solid state electronics technology available in a compact, portable and versatile
package. Your Wide Band Amplifier's quality, performance and trouble 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 CMX25
1 A/C Line Cord
1 Operation and Instruction Manual, Doc. No. CMX25MAN
1 Calibration Data Sheets and Response Curves (Included in Manual )
FIGURE 1.0
CMX25 ILLUSTRATION
Page
5
SECTION 2.0
GENERAL DESCRIPTION
The Instruments For Industry, Inc. ( IFI ) manufactured CMX25 Wide Band Amplifier is a
Bench Top or rack mount amplifier providing 40 Watts of linear RF power from 0.01 to 10000
MHz. The CMX25 incorporates two frequency bands of operation identified as Band 1 and
Band 2 which the CMX25 features easy operator frequency band switching without changing the
RF Output connections. The Band 1 frequency range is 10 kHz to 230 MHz with Band 2
frequency range being 200 MHz to 1.0 GHz. The minimum saturated output power over the
entire operating frequency range is more than 25 Watts.
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 internally by an operator
determined the Automatic leveling Control ( ALC ) setting.
The CMX25 is unconditionally stable and incorporates protection circuits that monitors and
controls the VSWR input and outputs so the amplifier cannot be damaged by any mismatched
load.
The CMX25 has an optional IEEE-488 BUS interface which allows the amplifier to be remotely
controlled through the use of as computer and a GPIB BUS.
Page
6
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. Refer to the Service Section for information on how to return items for warranty
repair.
Warranty liability shall be limited to repair or replacement of, or part thereof, which proves to be
defective after inspection by IFI. 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 design changes to any IFI product without incurring any obligation
to make the same changes to previously purchased units.
This warranty is the full extent of obligation and liability assumed by IFI with respect to any and
all IFI products. IFI neither makes, nor authorizes any person to make, any other guarantee or
warranty concerning IFI Products.
Page
7
SECTION 4.0
GENERAL INFORMATION
4.1 SCOPE OF THIS MANUAL
This manual is intended to inform a qualified transmitter operator or technician of the normal
operating and maintenance procedures for the CMX25. It is not intended to be a course of
instruction for unqualified personnel.
4.2 OPERATION OVERVIEW
The CMX25 is an integrated system with band switching capability for the frequency 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 output connector with the signal routed internally by RF Relays.
Refer to Figure 2.0, the System Block Diagram, for an illustration of the CMX25 band swiching
.
FIGURE 2.0
SYSTEM BLOCK DIAGRAM
Page
8
4.3 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.
4.4 GENERAL SPECIFICATIONS
The specifications listed below represent 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 ) See data sheet for specific input drive
levels
Harmonic distortion: < -20 dB at 20 Watts (Typically < -30 dB)
Gain Adjustment: Greater than 40 dB (voltage controlled) when using Level
Adjust.
Duty Factor: No limitation
RF Rise Time: Approximately 3 ns
Power Requirements: 5 to 10 Amps ( less than 1.0 KVA )
Page
9
4.5 PROTECTION CIRCUITS
The CMX25 is designed with a variety of protection circuits to provide safeguards for the
amplifier should any adverse electrical conditions occur or if the amplifier is accidentally
experiencing operator deviation of the design application. Listed below are the safeguards built
into the CMX25.
4.5.1 Over Heat Protection
The CMX25 critical components are mounted to heat sinks which are, in turn, air cooled by four
fans. Should a over heating condition occur, either through component failure or by a restricted
air flow, the CMX25 contains heat sensors that will shut down the system should an over heating
condition occur. As a result, the air inlet and outlet openings should be free of 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 compensate for the increased input signal by
reducing the gain of the preamplifier. Even though the amplifier has an Input Protection Circuit,
overdriving the amplifier is not recommended, refer to paragraph 5.1.2 for more details.
4.5.3 Output Protection
The CMX25 incorporates a microprocessor controlled Output Protection Circuit which monitors
the Forward Power Meter indication and limits the out put power to 40 Watts. This feature
protects the amplifier from being over driven and causing damage to the power transistors.
Page
10
4.5.4 Power Supply Faults
The Power Supply Fault circuit monitors the 28 VDC, ± 12 VDC and 5 VDC power supplies and
produces a fault indication should any voltage level deviate from normal operating parameters.
Each power supply voltage output is monitored and Green Status LEDs are illuminated to
indicate that the power supplies are operating within design parameters. Should any power
supply voltage deviate from the design parameters, the corresponding Green Status LED will
extinguish. The Power Supply Fault Indication LED, located on the front panel of the Power
Supply / Control Module is illuminated RED only when the 28 VDC power supply fails to meet
design tolerances in addition to the extinguishing Green Status Indicator LED. A ± 12 VDC or
5 VDC power supply failure will not illuminate the Power Supply Fault Indication LED, this
indicator is reserved only for the 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. 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 operator
monitoring for any mismatched load.
4.5.6 Modular Faults Indications
The CMX25 is a microprocessor controlled wide band power amplifier which the
microprocessor is designed to control and monitor critical components within it's circuitry. If the
microprocessor detects any abnormality, the microprocessor generates and stores up to 13
diagnostic fault codes which are scrolled on the LCD Display as a trouble shooting aide for the
operator. The CMX25 also has a RED Status Fault Indicator LED which illuminates when any
fault condition occurs.
4.5.7 Short Circuit Protection
The CMX25 utilizes three different power supply voltages, + 28 VDC, ± 12 VDC and the
+ 5 VDC, each of the power supplies are designed with a short circuit and overload protection
device.
Tabla de contenidos
Otros manuales de Amplificador de Atec
