Tegam 138-415-1 Instruction Manual Download | Manualshive

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Operation & Service Manual

Section I

Model 1805B RF Control Unit

Introduction and General Description

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Summary of Contents for 138-415-1

Page 1: ...this product was manufactured However products are constantly being updated and improved Because of this some differences may occur between the description in this manual and the product you received...

Page 2: ...ervice Potentially lethal voltages are present in this instrument Serious shock haz ards from voltages above 70 volts may exist in any connector chassis or cir cuit board Observe the following precaut...

Page 3: ...ush in the solvent as the bristles may dissolve and cause damage to the circuit card or component DO NOT use ultrasonic cleaning on parts or assemblies containing electrical or electronic components C...

Page 4: ...scription 1 3 Physical Description 1 3 Specifications 1 4 Recommended Materials 1 5 Special Tools and Test Equipment 1 5 APPLICATIONS 1 5 SECTION II INSTALLATION AND SHIPMENT GENERAL 2 1 Initial Inspe...

Page 5: ...EMPERATURE Meter 3 4 ADDRESS Switch 3 4 OPERATING INSTRUCTIONS 3 5 Initial Powerup and Checkout 3 5 Manual Operation 3 6 REMOTE OPERATION 3 7 TERMINATING OPERATION 3 8 THEORY OF OPERATION 3 8 Power Su...

Page 6: ...SWR Measurement Configuration 1 8 75 Ohm Sensor Calibration Setup 1 9 Typical Higher Power Calibration Setup 1 9 Spectrum Analyzer Calibration Setup 1 10 Physical Dimensions 1 11 Model 1805B 1807A Ben...

Page 7: ...BUS Signal Designators 2 1 Line Voltage Fuse Requirements 2 2 Mnemonics for Remote Control 3 1 Inspection 4 1 Dc Substituted Power Settings 4 2 Pin Height Specification A 1 Connector Torque Recommenda...

Page 8: ...so provides a description of each assembly testing of the unit maintenance procedures to maintain the instrument ARRANGEMENT The information contained in this manual is tabulated in the Table of Conte...

Page 9: ...t prior authoriza tion When it is necessary to return an item state the symptoms or problems catalog and type number of the instrument or component serial number of the item and date of original purch...

Page 10: ...ont panel selection of precise dc power levels These levels are 0 5 mW and 1 10 mW in 1 mW steps IEEE 488 Bus or front panel RF ON OFF switching Elimination ofac dc error by using dc for both bias and...

Page 11: ...SEMBLY A8 FRONT PANEL ASSEMBLY A9 REAR PANEL ASSEMBLY W1 RF CABLE ASSEMBLY W2 RF CABLE ASSEMBLY W3 ADDRESS SWITCH CABLE ASSEMBLY W4 CABLE BAND SELECT ASSEMBLY XF1 INPUT POWER ASSEMBLY Specifications T...

Page 12: ...ific signal source Leveled RF Power Dynamic Range 3 dB Referenced to DC Substituted Power Unbalanced Detector Sensitivity 2 mW division Resolution 0 2 mW Level Control Loop Gain 80dB minimum Temperatu...

Page 13: ...outline several applications for System IIA Figure 1 4 shows a calibration setup using a TEGAM Model 1727A RF Amplifier and a 10 dBm RF Signal source to increase the output power so that the Model 18...

Page 14: ...erational Checkout Calibration equivalent HP8481 or equivalent Power Sensor Type N 0 01 18 GHz Operational Checkout Calibration Weinschel 44 10 or 10 dB Fixed Attenuator Type N dc Operational Checkout...

Page 15: ...Operation Service Manual Section I Model 1805B RF Control Unit Introduction and General Description Figure 1 5 SWR Measurement Configuration 1 8 Figure 1 4 10 mW Configuration Using Model 1727A...

Page 16: ...e 75 ohm power sensors over the 0 1 MHz 2 7 GHz frequency range Figure 1 7 shows the Model 1805B using a 1109H or 1119H to perform calibrations on higher power terminating sensors from 1 W to 5 W Figu...

Page 17: ...Operation Service Manual Section I Model 1805B RF Control Unit Introduction and General Description Figure 1 8 Spectrum Analyzer Calibration Setup 1 10...

Page 18: ...Operation Service Manual Section I Model 1805B RF Control Unit Introduction and General Description Figure 1 9 Model 1805B Physical Dimensions 1 11 I 0...

Page 19: ...Operation Service Manual Section I Model 1805B RF Control Unit Introduction and General Description 1 12...

Page 20: ...it has been determined that shipping damage has occurred immediately contact the delivering carrier to perform an inspection and prepare a concealed damage report Do not destroy any shipping or packin...

Page 21: ...instruments to create a 19 inch stackable bench instrument Figure 2 1 or can be mounted in any cabinet or rack according to EIA RS 310 or MIL STD 189 using Model 1919 Rack Adapter Kit Figure 2 1 Mode...

Page 22: ...pplied to the thermistor mount Per convention red is dc whilte black is dc TEMPERATURE CONTROL Connector J1 The TEMPERATURE CONTROL Connector J1 is located near the lower right hand corner of the fron...

Page 23: ...ORRECTLY IF AM OUTPUT IS CONNECTED TO A LOAD Power Input Assembly XF1 The Power Input Assembly contains a three prong ac power input connector and a voltage selector fuse assembly Figure 2 3 The desig...

Page 24: ...that the power cord is DISCONNECTED before attempting to change fuses Table 2 2 Line Voltage Fuse Requirements DO NOT connect or apply power to this instrument until the Power Input Assembly has been...

Page 25: ...ces you The X on the board in the diagram depicts this location e Slide the board back into the module as shown in the diagram with the desired volt age still appearing as set in Step d f Replace the...

Page 26: ...Operation Service Manual Section II Model 1805B RF Control Unit Installation and Shipment Models 1109 1109H 1116 1117A 1119H or 1119 Figure 2 6 Precision Power Source Setup 2 7...

Page 27: ...ent Figure 2 7 Precision Power Source Setup PREPARATION FOR RESHIPMENT OR STORAGE RESHIPMENT Perform the following procedures when reshipping an instrument or component NOTE DO NOT return any instrume...

Page 28: ...ssories and hardware into container f If shipping the instrument for service attach a tag to indicate the following Model and serial number Service required Description of malfunction Return address A...

Page 29: ...ilm resistors provide dc power increments across a TEGAM patented self balancing bridge The front panel bridge meter provides visual indication that closed loop stabilization has been achieved and ena...

Page 30: ...laboratory should be held to a minimum to avoid excessive temperature fluctuations within the sensor or instrument under test All equipment should be operated on a laboratory work bench as firm and s...

Page 31: ...up or ON position all required power for operation is applied to the Model 1805B and the green ON indicator is illuminated ON INDICATOR The ON indicator DS4 is a green LED located near the lower left...

Page 32: ...front panel This control provides coarse null adjustment of the bridge balance reading on the BRIDGE BALANCE meter prior to the application of RF power ERROR INDICATOR The ERROR indicator DS3 is a red...

Page 33: ...IIA whose purpose is to accurately transfer the calibration factors of NIST standards to feedthrough and terminating bolometer mounts thermistor mounts and power sensors The following paragraphs provi...

Page 34: ...ocal control as follows a Leave the POWER switch in the ON position b Select the desired dc substituted power level using me DC SUBSTITUTED POWER switch c With the RF ON OFF switch in the OFF position...

Page 35: ...ent and terminology refer to the IEEE Standard 488 1978 Digital Interface for Programming Instrumentation The REMOTE indicator is lit when the 1805B is placed into remote mode by the bus controller Wh...

Page 36: ...s these thermistor beads These thermistor beads whose resistance decreases as a function of increasing power compromise a leg of self correcting de biased Wheatstone bridge circuit which origi nates i...

Page 37: ...L eight byte 8085 parallel microprocessor with a 6 MHz clock U1 interprets instructions stored in EPROM erasable electrically program mable ROM U10 Programmable logic array U9 interfaces the microproc...

Page 38: ...ion stored in EPROM U2 These instructions tell the processor to scan U3 the IEEE talker listener chip status register for function changes U3 is a microprocessor controlled with eight read and eight w...

Page 39: ...are instrumental in closed loop leveling in the RF ON mode These circuits are a thermistor temperature controller and a bridge sense high gain differential amplifier RF amplifier board circuitry also...

Page 40: ...Three operational amplifiers make up this circuit U6 senses the bridge differential and provides high gain U7 conditions signals and U8 drives the RF generator AM Modulation signal via board connector...

Page 41: ...he sensed potential found across the thermistor to two reference voltages These reference voltages are equivalent to those required to produce 29 3 mW and 30 7 mW across the thermistor If the thermist...

Page 42: ...Operation Service Manual Section III Model 1805B RF Control Unit Theory Operation 3 14...

Page 43: ...power measurement values can be quite arbitrary The calibration factor can thus be up to several dB and have either sign A negative sign indicates a system that is reading a level lower than actual A...

Page 44: ...s Care should be taken to prevent strain on the interconnecting cables since damage here may not always be apparent Occasionally check the external cables and connectors for signs of cracked insulatio...

Page 45: ...sed air used for cleaning and or drying can create airborne particles that may enter the eye Goggles faceshields should be worn Do NOT direct air stream towards self or other personnel Pressure should...

Page 46: ...ng Nicks burrs or foreign materials present Printed Circuit Boards Broken or loose wires damaged circuit traces clad damaged components or chassis loose missing or damaged wires cables or hardware poo...

Page 47: ...dividing factor DF 1 Measure total series resistance of RS1 and RS2 with a multimeter and make note of measured value 2 Measure resistance of RS2 with an ohmmeter and make note of measured value 3 Cal...

Page 48: ...procedures Perform the 30 volt reference test prior to making any adjustments BIAS POWER RANGE TEST The following procedures will determine that the 1805B bias power range is within specification list...

Page 49: ...rmistor mount is first connected to the 1805B and the 1805B is in POWER STANDBY mode the needle of the TEMPERATURE Control Meter should provide an approximate full scale reading 9 2 to 10 2 Once the m...

Page 50: ...BIAS connectors J3 and J4 Connect the 1805 s Temperature CONTROL output J1 to the Feedthrough Thermistor Mount s Temperature Control input on the 1109 connect to Temperature Control connector J1 on t...

Page 51: ...test occurs b Place all Test Equipment Power switches to ON Allow for a 3 24 hour warm up period for the Feedthrough Power Standard and Power Meter to Stabilize c Zero and calibrate the power meter an...

Page 52: ...he balance of the original warranty or at least 90 days whichever is longer Limitation of Warranty TEGAM Inc warranty does not apply to defects resulting from unauthorized modification or misuse of an...

Page 53: ...following Bent pins male Bent or missing tines female Worn or chipped plating Damaged or displaced dielectric inserts Thread damage Folded or mushroomed outer interface rims Mushroomed pin shoulders m...

Page 54: ...the cable assembly but more significantly front or rear panel connectors on the equipment itself which may be more difficult to repair Aligning Connectors Align the center lines of two connectors befo...

Page 55: ...LING OF MICROWAVE COAXIAL ASSEMBLIES Figure A 2 Important Interface Dimensions for Type 7 MM Precision Connectors IEEE Std 287 FIGURE A 3 IMPORTANT INTERFACE DIMENSIONS FOR TYPE BNC CLASS II CONNECTOR...

Page 56: ...ctors MIL C 39012 16 17 Figure A 5 Important Interface Dimensions for Type TNC Class II Connectors MIL C 39012 26 27 MATING CONNECTORS Gently mate the connectors by hand taking care not to force the c...

Page 57: ...tor of the hex nut type al ways use a torque wrench set to the correct torque value Tighten the connector slowly until the wrench snaps Tightening too quickly can cause the wrench to exceed its set li...

Page 58: ...ut hastily Similarly re roll them when storing them away again CLEANING CONNECTOR INTERFACES Use the following guidelines in cleaning connector interfaces A Do not use chlorinated solvents including c...

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