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Tegam F1125, Instruction And Service Manual

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    Operating Instructions 

 

 

Coaxial RF Power Standards Instruction and Service Manual

 

3-2 

 

General 

 

The TEGAM RF Power Standards are designed to be employed as the fourth arm of a bridge 

configuration. These units are designed as the sensing element in RF power calibration and 

measurement systems. These systems employ other electronic elements to effect control of the 

measurement routines. An example of this type of system is the TEGAM System II Power Sensor 

Calibration System. Proper use of these standards and the TEGAM System II is further 

documented in other TEGAM Operation and Service Manuals. The Working RF Power Standards 

(Models F1125, F1130, and F1135) are feedthrough mount-splitter combinations are use to 

calibrate thermoelectric, diode, and thermistor power sensors. The Reference RF Power Standards 

(Models M1125, M1130, and M1135) are terminating thermistor mounts commonly used as a 

reference standard for calibrating working standards. Both types of standards are used with a 

precision DC Substitution Bridge such as found in the TEGAM Models 1806(A), 1805B, and 1830A. 

 

Model F1125, F1130, and F1135 Connector Descriptions 

 

 

Figure 3.1 Model F1125 Front View 

 

RF IN connector 

SMA female connector that connects to signal generator output. The RF power that comes in this 

connector is applied equally to the DUT and the power standard. The fact that equal RF power is 

applied to both the power standard and the DUT is what allows the determination the calibration 

factor of the DUT. There is at least 6 dB of insertion loss in the RF IN path and as much as 10.5 

depending on the specific model (see “Specifications” in Chapter I Instrument Description). 

 

TEMP connector 

4 pin mini-microphone connector that is used to connect the internal heater to a heater control 

circuit found in TEGAM Models 1805B, 1806(A), 1830A, and 1820. RF Power Standards require at 

least two hours of warm-up time to reach their operating temperature. A Temperature Control 

cable is supplied with the Models F1125, F1130, and F1135. 

 

BIAS VOLTAGE connectors 

Binding posts used to connect the thermistor element to a DC Substitution bridge circuit as is 

found in the TEGAM Models 1805B, 1806(A), 1830A, and 1804. The bridge operates on the 

principal of DC substitution, so only DC voltages and currents are present at these terminals when 

connected. 

 

 

 

 

Summary of Contents for F1125

Page 1: ...MODELS F1125 A F1130 A B F1135 A B M1125 A M1130 A M1135 A Coaxial RF Power Standards Instruction and Service Manual PN IM300 Publication Date April 2015 REV R ...

Page 2: ...del M1135 Model F1135 Instruction and Service Manual PN IM300 Publication Date April 2015 REV R NOTE This user s manual was as current as possible when 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 received ...

Page 3: ...LCR meters handheld temperature calibrators thermometers humidity and temperature control devices and more TEGAM also repairs and calibrates test and measurement equipment formerly manufactured by Electro Scientific Industries ESI Gertsch Keithley Instruments Lucas Weinschel and Pragmatic Instruments A complete list can be viewed on our Product Service Directory at www tegam com For more informati...

Page 4: ... Standard Model F1125 F1130 F1135 1 8 Figure 1 5 Measuring a 50 MHz Reference Output on a Power Meter using a Primary Transfer Standard Model M1125 M1130 M1135 1 9 Figure 1 6 Calibration of a Working Transfer Standard using a Primary Transfer Standard 1 9 II PREPARATION FOR USE 2 1 Unpacking Inspection 2 2 Mounting 2 2 Safety Information Precautions 2 2 Terms in this Manual 2 2 Terms as Marked on ...

Page 5: ...Rear Panel Screws 5 3 Power Splitter Calibration 5 3 Figure 5 2 Location of Power Splitter in the F1125 F1130 and F1135 5 3 Figure 5 3 Location of Allen Head Screws and Collar on F1125 and F1130 5 4 Figure 5 4 Location of Phillips Head Screws on F1135 Splitter Support Bracket 5 5 Thermistor Bias Voltage Calibration 5 6 Figure 5 5 Location of Bias Adjustment 5 7 Calibration Factor 5 7 Figure 5 6 Co...

Page 6: ...Instrument Description Coaxial RF Power Standards Instruction and Service Manual 1 1 INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION MAINTENANCE SERVICE INFORMATION ...

Page 7: ...manual Abbreviations and acronyms that are not listed conform to MIL STD 12D CW Continuous Wave DUT Device Under Test DMM Digital Multi Meter DVM Digital Voltmeter ESDS Electrostatic Discharge Sensitive NIST National Institute of Standards and Technology RF Radio Frequency DC Direct Current Figure 1 1 Models M1125 F1125 Figure 1 2 Models M1130 F1130 Figure 1 3 Models M1135 F1135 ...

Page 8: ...r Figure 1 5 Physical Description Refer to Table 1 1 for the general specifications for the RF Power Standards The Working RF Power Standards feature a SENSOR RF INput BIAS VOLTAGE and TEMPerature connectors on the front panel The Reference RF Power Standards feature an RF INput connector on the front and BIAS VOLTAGE and TEMPerature connectors in the rear The Working RF Power Standards can be mou...

Page 9: ...racy typical 0 80 from 0 1 to 10 MHz 0 90 from 10 to 4200 MHz 1 0 from 0 1 to 10 MHz 1 1 from 10 to 4200 MHz Connectors SENSOR RF IN TEMP BIAS VOLTAGE N type Female SMA Female 4 pin mini microphone Binding Post standard 0 75 spacing for banana plugs N A N Type Male 4 pin microphone Binding Post standard 0 75 spacing for banana plugs Weight 5 5 lbs 2 5 kg 2 88 lbs 1 3 kg Physical Dimensions Height ...

Page 10: ...to 10 GHz 1 10 from 10 to 18 GHz 1 0 from 0 1 to 10 MHz 1 20 from 0 01 to 10 GHz 1 30 from 10 to 18 GHz Connectors SENSOR RF IN TEMP BIAS VOLTAGE N type Female SMA Female 4 pin mini microphone Binding Post standard 0 75 spacing for banana plugs N A N Type Male 4 pin microphone Binding Post standard 0 75 spacing for banana plugs Weight B Model 5 5 lbs 2 5 kg 8 2 lbs 3 7 kg 3 22 lbs 1 5 kg Physical ...

Page 11: ...7 5 GHz 2 5 from 17 75 to 26 5 GHz 1 2 from 0 01 to 0 04 GHz 1 4 from 0 05 to 4 0 GHz 1 7 from 4 20 to 12 0 GHz 2 3 from 12 2 to 17 5 GHz 2 6 from 17 75 to 26 5 GHz Connectors SENSOR RF IN TEMP BIAS VOLTAGE 3 5 mm Female SMA Female 4 pin mini microphone Binding Post standard 0 75 spacing for banana plugs N A 3 5 mm Male older version may have 2 92 mm 4 pin microphone Binding Post standard 0 75 spa...

Page 12: ...dards The description for each piece of equipment listed states the minimum recommended requirements for that piece of equipment There may be many models that meet the minimum requirements it is up to the operator to select the specific model Measurement uncertainty will vary depending on the additional equipment used Please refer to the specifications for the particular model number to get that i...

Page 13: ...nd Service Manual 1 8 BIAS VOLTAGE TEMPERATURE Model 1805B AM Out rear of 1805B AM Input RF Output Signal Generator BIAS VOLTAGE RF IN TEMP IN SENSOR Model F11XX DUT Power Meter Figure 1 4 RF Power Sensor Calibration Using a Working Standard Model F1125 F1130 F1135 ...

Page 14: ...ing a 50 MHz Reference Output on a Power Meter using a Terminating RF Power Standard Model M1125 M1130 M1135 BIAS VOLTAGE TEMPERATURE Model 1805B AM Out rear of 1805B AM Input RF Output Signal Generator BIAS VOLTAGE RF IN TEMP IN SENSOR Model F11XX Model M11XX BIAS VOLTAGE TEMP Model 1806 VOLTMETER BIAS VOLTAGE TEMP VOLTMETER BRIDGE A BRIDGE B DVM or DMM V V Figure 1 6 Calibration of a Working Pow...

Page 15: ...Preparation for Use Coaxial RF Power Standards Instruction and Service Manual 2 1 INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION MAINTENANCE SERVICE INFORMATION ...

Page 16: ... also be rack mounted in a standard 19 rack using the optional rack mount kit F1120 RMK For Model F1130B and F1135B use rack mount kit Single P N 1830 910 Dual P N 1830 911 The Model M1125 M1130 and M1135 are shipped with four adjustable feet fastened to the base of the unit Not only are these feet used to support the instrument they are used to adjust the height of the instrument to ensure the ma...

Page 17: ...provides a good working condition A tolerance of 1 C gives allowable temperature spread Controlled temperatures also stabilize the aging process of the standards CAUTION The RF Power Standards have a specified ambient temperature range of 12 to 40 C 54 to 104 F Operating beyond these limits can affect the accuracy of the instruments and damage internal circuitry CAUTION When an RF Power Standard i...

Page 18: ...ne Do not perform service or adjustment on this product unless another person capable of rendering first aid is present Use Care When Servicing with Power On or Off Dangerous voltages may exist at several points in this product To avoid personal injury or damage to this equipment avoid touching exposed connections or components while the power is on Assure that the power is off by disconnecting th...

Page 19: ...Operating Instructions Coaxial RF Power Standards Instruction and Service Manual 3 1 INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION MAINTENANCE SERVICE INFORMATION ...

Page 20: ...806 A 1805B and 1830A Model F1125 F1130 and F1135 Connector Descriptions Figure 3 1 Model F1125 Front View RF IN connector SMA female connector that connects to signal generator output The RF power that comes in this connector is applied equally to the DUT and the power standard The fact that equal RF power is applied to both the power standard and the DUT is what allows the determination the cali...

Page 21: ... heater to a heater control circuit found in TEGAM Models 1805B 1806 A 1830A and 1820 RF Power Standards require at least two hours of warm up time to reach their operating temperature This connector is compatible with the heater control cable supplied with Models 1805B 1806 1830A and 1820 BIAS VOLTAGE connectors Binding posts used to connect the thermistor element to a DC Substitution bridge circ...

Page 22: ...nectors of the standards are 5 way binding posts so banana plugs or spade lugs can be used See the mating equipment instruction manual for the correct Bias Voltage cable part number The RF IN on the Working Feedthrough Power Standards Models F1125 F1130 F1135 is an SMA female coaxial connector that is connected to the output of the chosen signal generator which should be 50 Ohm nominal impedance A...

Page 23: ...Theory of Operation Coaxial RF Power Standards Instruction and Service Manual 4 1 INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION MAINTENANCE SERVICE INFORMATION ...

Page 24: ...re coefficient of the beads Initially the beads are DC biased to 200 ohms Application of RF power increases the power level present at the beads and causes the effective resistance value of the beads to drop The Type IV bridge circuit reduces DC power until the initial effective resistance value is restored 200 ohms The total amount of DC power removed is proportional to the amount of RF power tha...

Page 25: ...ero temperature coefficient wire manganin make up two legs of the bridge The remaining two bridge windings R3 and R4 have a positive temperature coefficient wire nickel In an unbalanced condition the bridge output controls the current output of a temperature controller Hence the bridge configuration accomplishes both a temperature sensing and heating function Bias Voltage Adjust R1 R4 R3 R2 1 4 3 ...

Page 26: ...sion resistance leg when RF power is applied to the thermistor leg P1 power across the precision resistance leg without RF power applied P2 power across the precision resistance leg with RF power applied By substituting for P1 and P2 from the previous formula P V1 2 V2 2 200 200 Combining terms P V1 2 V2 2 200 Where P the change in power of the precision resistance leg when RF power is applied to ...

Page 27: ...ting RF Power Standard traceable to NIST The system determines the calibration factor of the tested mount in terms of the known calibration factor of the previously calibrated thermistor mount and the precision measurement of the substituted DC power The Feedthrough RF Power Standard is used to determine the calibration factor for other terminating powers sensors The calibration factor for a Devic...

Page 28: ...ing the Feedthrough Power Standard the power splitter is removed and its reflection coefficient is measured with a network analyzer The power splitter is replaced in the Feedthrough Power Standard assembly and the reflection coefficient of the sensor port of the power splitter is the reflection coefficient for the entire assembly Since the Feedthrough Power Standard is actually calibrated as an as...

Page 29: ...tion factor of the Feedthrough RF Power Standard K1S calibration factor of the DUT Γ1 reflection coefficient of the Terminating RF Power Standard Γ2 reflection coefficient of the Feedthrough RF Power Standard Γ1S reflection coefficient of the DUT The Gamma Correction part of the previous equations can be rewritten in terms of reflection coefficient magnitude ρ and angle φ 1 ρ1ρ2 cos φ1 φ2 2 ρ1ρ2 s...

Page 30: ...Maintenance Coaxial RF Power Standards Instruction and Service Manual 5 1 INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION MAINTENANCE SERVICE INFORMATION ...

Page 31: ...pe IV Power Meter or equivalent Nominal Bridge Resistance Bridge Accuracy 200 Ohms 0 003 CW RF Signal Source Frequency Range Power Output Same as the Power Standard being calibrated 6 dBm minimum up to 16 dBm 13 16 Torque Wrench Torque Value 14 1 in lbs for N type connectors 5 16 Torque Wrench Torque Value 7 8 in lbs for SMA and 3 5 mm connectors 9 64 7 64 and 5 64 Allen Hex Wrench 1 and 2 Philips...

Page 32: ...f the Working RF Power Standard and verifies it is within specification While a Scalar Network Analyzer can be used TEGAM recommends a Vector Network Analyzer be used to measure not only the magnitude but also phase of the reflection coefficient that data can be used later to apply Gamma corrections to the cal factor of the Standard 1 Disconnect all cables from rear of the Thermistor Mount Assembl...

Page 33: ...tions of Allen Head Screws and Collar on F1125 and F1130 a For Models F1125 and F1130 Type N connectors Refer to figure 5 3 Remove 2 Allen head screws that clamp power splitter input to Splitter Support Bracket Remove collar that is over the thermistor mount output connector by loosening two set screws and sliding the collar forward Then loosen the nut on the type N male connector NOTE The F1130 h...

Page 34: ...e power splitter and thermistor mount Use care when connecting and disconnecting all coaxial connectors and use proper torque wrench when connecting 4 Terminate Output Port 3 of the power splitter Connect Input Port 1 and Output Port 2 to the network analyzer to measure insertion loss S21 and the reflection coefficient of Port 2 S22 Record these measurements for each calibration frequency The inse...

Page 35: ... SureCal dat file for the Working Standard 9 Reassemble the power splitter to the thermistor mount Make sure all coaxial RF connectors are properly torqued The type N connectors should be torqued to 14 1 in lbs and the 3 5 mm connectors to 7 8 in lbs 10 Slide the Thermistor Mount Assembly toward the front of case making sure the splitter output port that is the SENSOR port is all the way through t...

Page 36: ... Bias Voltage has been adjusted to 2 45 V replace the plug in the Bias Voltage Adjustment access hole Calibration Factor This test characterizes the calibration factor of the Working Power Standards F1125 F1130 and F1135 The Working standard is characterized from the SENSOR port using a Reference Power Standard M1125 M1130 or M1135 This procedure can be automated using SureCAL Automated Metrology ...

Page 37: ...n the connectors Once a good connection has been made adjust the feet of the Reference Standard while still supporting with the other hand so they will hold the weight Make sure RF connectors are clean and use proper torque wrench to tighten 4 Connect Signal Generator output to the input of the Working Feedthrough Power Standard refer to Figure 5 6 Make sure RF connectors are clean and use proper ...

Page 38: ... nominal power level setting of 6 dBm on the Signal Generator will provide approximately 0 dBm 1 mW at the SENSOR port of the Working Standard That is due to losses in the coaxial power splitter cables and adapters This level can be adjusted according to actual losses which can be determined by measurements made from the Reference Power Standard It is recommended the level at the SENSOR port be ke...

Page 39: ... Corrected K2 K2 1 Γ1Γ2 2 Where Corrected K2 cal factor of the Working Standard after Gamma correction is applied K2 cal factor of the Working Standard before Gamma correction is applied Γ1 reflection coefficient of the Reference Power Standard Γ2 reflection coefficient of the Working Standard The same formula in terms of magnitude ρ and phase angle φ Corrected K2 K2 1 ρ1ρ2 cos φ1 φ2 2 ρ1ρ2 sin φ1...

Page 40: ...Service Information Coaxial RF Power Standards Instruction an Service Manual 6 1 INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION MAINTENANCE SERVICE INFORMATION ...

Page 41: ...r the return of the product to the customer if the shipment is to a location within the country in which the TEGAM service center is located The customer shall be responsible for paying all shipping duties taxes and additional costs if the product is transported to any other locations Repaired products are warranted for the remaining balance of the original warranty or 90 days whichever period is ...

Page 42: ...o metal filing or residue remains inside the connector and the connector is thoroughly dry Where rust corrosion and or oxide deposits are present in large quantities replace the connector Calibration Since the stability of the calibration factor of a thermistor mount depends upon the extent of use degree of temperature stability and care in handling TEGAM recommends recalibration of the standard e...

Page 43: ...trument Many times repair turnaround is unnecessarily delayed due to a lack of repair instructions or lack of a detailed description of the problem The detailed problem description should include information such as type of sensor being tested what is the voltage across the bias terminals when RF power is not applied what device was the Standard connected to is the problem intermittent when is the...

Page 44: ...air process RMA Instrument Model Serial Number Company Technical Contact Phone Number Additional Contact Info Repair Instructions Evaluation Calibration Only Repair Only Repair Calibration A2LA Accredited Calibration Extra Charge Detailed Symptoms Include information such as measurement range instrument settings type of components being tested is the problem intermittent When is the problem most f...

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