1825 Manual
Contents
1. TEGM RF Power Sensor Calibrator Model 185 SENSOR POMER I 7 sa tgi o et FREQUENCY RANGE 10MHz to 18 GH 1 N POMER RANGE 10 pW to 25m F POMERON SENSOR VOLTMETER PFIN Indicator Connector Switch Connecinr s POWER ERROR A RFIN RF IN l ce ae ae a Me A H Ai I g READY o amp FROR FREQUENCY RANGE 100kHz to 18GHz POER RANGE 10 uW to 25mW Figure 3 1 Model 1825 top and 1827 bottom Front Panel POWER Switch Both Models Switches the power input to the instrument on and off Has a built in indicator that is illuminated when power is on See POWER ON indicator POWER ON Indicator Both Models illuminates when instrument power is on It is built into the POWER switch READY Indicator Both Models This green LED illuminates when the RF power standard has reached its internal operating temperature of 60 C Allow two hours for the power standard to reach this temperature and ensure the READY indicator stays illuminated during RF power sensor calibrations ERROR Indicator Both Models The ERROR indicator is a red LED that illuminates for any condition preventing the Type IV Bridge circuit from balancing When the ERROR indicator becomes illuminated stop any calibration and contact TEGAM for assistance Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 2 TEGAM Operating I nstructions SENSOR Connector Both Models N type female connector for the SUT This connect2. ccccsceeesceeeeeeeeeeeeeeeeaeeeeeeeeeeeeeueeesuaeueueseaeaseauaeegeaeeananes 2 1 Unpacking amp INSP CtiON 0 cece cee eee ene ene teeta teen ne eae 2 2 MOUNTING nse ociceies Homies EEEE REEE ete nds RERE EE EEEE opens eee 2 2 Safety Information amp Precautions c cece cece eee eee teeta ene e nae na eee 2 2 Terms in this Manual c cece cece eee eee eee eee eee ne ease ae eaten anata 2 2 Terms as Marked on EquipMment cceceeee cece eee eee teens teeta e eee nena eae 2 2 SY MDO S vesictececthcattek cease oaltay vetoed iauldied hited E E aa aceite adaware 2 3 Grounding the Equipment 00 c cece cece ee eee eee eee eee a etna eee nates 2 3 Danger Arising from the Loss of Ground c cece eee ee eee eee e eee ee ened 2 3 Use the Proper FUSC ccece cece eee eee eee eee teen e eee e teen a eee ene ena ee 2 3 Use in Proper Environment ccceee cece eee ee eee ene eae teen e neta ened 2 4 Do Not Use in Explosive Environment 0 cceeeee eee teat eae ee eee e neta eed 2 4 Do Not Block Air Vents on Rear Panel ccceeee cent eee e eee e eee teeta teenies 2 4 Do Not Operate without Covers ccc cece eee e eee eee eee teeta teen ee ened 2 4 Figure 2 1 Model 1825 and 1827 AC INPUT POWER and FUSE Location 2 4 Servicing Safety SUMMALY cece cette eee eee eae ened e teeta ena e eee 2 4 Do not Service Alone ss
3. Level of applied RF power Pac DC substituted power which is proportional to the applied RF power K2 calibration factor of Models 1825 or 1827 traceable to NIST RF Power Level Measurement With DVM And Reference Voltage Generator When the applied RF power level becomes small the change in voltage across the bridge also becomes very small In this situation even a high accuracy voltmeter magnifies measurement uncertainties because the large DVM measurement scale has limited resolution Use of a reference voltage generator RVG like the one in Figure 3 5 minimizes voltmeter uncertainties by enabling use of a measurement scale that has better resolution RVG Signal Generator Power Meter RF Out E SENSOR VOLTMETER Model 1825 or 1827 Figure 3 5 Connections for Using the Model 1825 or 1827 with an RVG Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 7 TEGAM Operating I nstructions When a reference voltage generator is used with the DVM calculation of the RF power level requires a different process First adjust the reference voltage generator to a voltage level approximately equal to the Model 1825 1827 bridge output measured by a DVM when no RF power is applied Ensure stabilization of the RVG output throughout the entire measurement period Next record the DVM reading with no RF power applied to the bridge and the double pole double throw switch in the Measure V
4. position This value is V1 Switch the DVM to a scale with improved resolution for smaller power levels Record the DVM reading with no RF power applied and the double pole double throw switch in the Measure Vp position This reading is the difference between the Model 1825 1827 bridge output and the setting of the reference voltage source VD1 Finally apply RF power to the bridge and record the voltmeter reading with the double pole double throw switch in the Measure Vp position This value is the difference between the Model 1825 1827 output and RVG output including the proportional RF power effect on the bridge circuit VD2 Use these values and the following method to calculate the applied level of RF power First determine the level of DC substituted power using the measurements taken above with the equation Pac 2V1 Vp2 Voa Voz Voa 200 Where V DVM reading across the bridge in the absence of RF power Vp Difference between 1825 1827 bridge output with no RF applied and RVG output Vp2 Difference between 1825 1827 bridge output with RF applied and RVG output 200 nominal resistance of the 1825 1827 thermistor in Ohms Puc DC substituted power which is proportional to the applied RF power Next apply the mount calibration factor to find the level of RF power using the second equation Prr Pac K2 Where Prr Level of applied RF power Pac DC substituted power which is proportional to
5. the voltage before the application of RF power Vi To determine the power across the precision resistance leg with RF power applied measure the voltage during the application of RF power V2 Once these two voltage measurements are made the power can be determined by using the first equation By substituting for P and P2 from the previous formula AP Vi V2 200 200 Combining terms AP V1 V2 200 Where AP the change in power across the precision resistance leg when RF power is applied to the thermistor leg V DVM reading across the bridge in the absence of RF power V2 DVM reading across the bridge with RF power applied 200 nominal resistance of the 1825 1827 thermistor in Ohms Since the change in power across the precision resistor is DC power AP is also represented as Pac The change in DC power across the precision resistor is directly proportional to the RF power introduced to the thermistor Like all RF power sensors some of the RF power applied to the input of the Model 1825 1827 s power standard is lost by reflection and other causes before it is applied to the thermistor element Thus calibration factors based on frequency are associated with the Model 1825 and 1827 and are applied in the following formula to determine the actual level of RF power Pre Pac K2 Where Prr Level of applied RF power Pac DC substituted power which is proportional to the applied RF power K calib
6. Power Linearity has zero effect Otherwise to determine Power Linearity multiply the nominal power level by 0 01 up to a nominal power level of 10 mW From 10 to 25 mW the additional Power Linearity becomes negligible Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 4 7 Service I nformation INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION SERVICE INFORMATION Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 5 1 TEGAM Service I nformation Warranty TEGAM Inc warrants this product to be free from defects in material and workmanship for a period of 1 year from the date of shipment During this warranty period if a product proves to be defective TEGAM Inc at its option will either repair the defective product without charge for parts and labor or exchange any product that proves to be defective TEGAM Inc warrants the calibration of this product for a period of 1 year from date of shipment During this period TEGAM Inc will recalibrate any product which does not conform to the published accuracy specifications In order to exercise this warranty TEGAM Inc must be notified of the defective product before the expiration of the warranty period The customer shall be responsible for packaging and shipping the product to the designated TEGAM service center with shipping charges prepaid TEGAM Inc shall pay for the return of the product to the c
7. applied to the SUT s cal factor as follows Corrected Kis Kis 1 r Where Corrected K s cal factor of the SUT after Gamma correction are applied K s cal factor of the SUT before Gamma correction is applied T reflection coefficient of the 1825 or 1827 T2 reflection coefficient of the SUT That equation can be simplified to Corrected Kis Kis Za Lene Ci Ts a a 1 pip2 Cos o1 o2 pip2 SiN d1 2 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 4 6 TEGAM Theory of Operation Instrumentation Uncertainty l These uncertainties are limited by the quoted accuracies of the various equipment involved Refer to Table 4 1 for an analysis Table 4 1 A Typical Instrumentation Error Analysis le Item Specified Accuracy Effect on Uncertainty Model 1825 1827 DC Substitution Bridge Accuracy 0 003 0 003 Connector Repeatability 0 1 0 1 Temperature drift 0 05 0 05 Power Linearity 1 to 10 mW 0 1 Oat LmW Calibration Factor Drift with 0 5 0 5 Time Total RSS Uncertainty 0 51 Other Instruments Digital Voltmeter Accuracy See manufacturer s specifications Digital Voltmeter Nonlinearity See manufacturer s specifications Power Meter Accuracy See manufacturer s specifications It should be noted that the Model 1825 and 1827 are calibrated at 1 mW If the transfer to the SUT is also performed at 1 mW then the
8. meter s reference output There are essentially two methods of calibrating sensors with a Reference CF The first involves applying the offset mathematically To do this measure the RF power level and determine the sensor s calibration factor at the reference frequency usually 50 MHz Then determine the ratio of the desired reference cal factor to the cal factor that was calculated The ratio is an offset calculated by Kort Kref Kis Where Kop the calibration factor offset Ke desired reference cal factor Kis cal factor of the SUT The rest of the sensor s calibration factors are multiplied by Kos The second method of calibrating a power sensor with a Reference CF involves using the calibration offset of the power meter itself Simply set the calibration offset of the power meter to the desired reference cal factor and cal adjust the meter using the reference output Once the power meter is adjusted the rest of the cal factors can be obtained as described in the previous sections no further calculations are necessary Calibrating Sensors Using an Adapter or Attenuator It may be necessary to use an adapter or attenuator to calibrate a particular power sensor with the Model 1825 or 1827 If the sensor s power range is less than the power range of the Model 1825 1827 20 to 14 dBm then an attenuator is needed If the sensor does not have an N type male connector then an adapter would be needed A 50 to 75 Ohm matching
9. pad is needed to calibrate 75 Ohm sensors Any device placed between the SENSOR connector and the SUT will affect the calibration results and its loss attenuation must be characterized and corrected for Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 9 TEGAM Operating I nstructions In order to correct for the loss of a device adapter or attenuator the attenuation of the device must be measured at each frequency it will be used There are many ways to measure attenuation a network analyzer is probably the most precise Once the attenuation of the device is measured the loss factor at a particular frequency must be determined by Ka 10 Where Ka the loss factor of the attenuator or adapter A the measured attenuation in of the device in dB should be a negative value To determine the calibration factor of the SUT measurements are taken as previously described in this chapter The formula to determine the sensor s calibration factor is slightly different Kis Pm K2 Pac Ka Where K s cal factor of the SUT Pm power reading from the power meter K calibration factor of Model 1825 or 1827 traceable to NIST Pac DC substituted power which is proportional to the applied RF power Ka the loss factor of the attenuator or adapter Additional I nformation Repeat the process for each frequency the SUT is to be calibrated It is not necessary to get a DVM reading across the bridge with
10. settings type of components being tested is the problem intermittent When is the problem most frequent Has anything changed with the application since the last time the instrument was used etc Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 5 4
11. tegam com or contact one of our customer service representatives at sales tegam com or 800 666 1010 TEGAM Ten Tegam Way Geneva Ohio 44041 Telephone 440 466 6100 Fax 440 466 6110 E mail sales tegam com Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual ZZ Table of Contents l INSTRUMENT DESCRI PTION ccsccececeeeeeeeeeeeeeeeeeeeeuaeesuaeeeuaeeeuaeeauaeeeuaeeaueeeauanes 1 1 Abbreviations and ACronysS cccceee cece eee ence e eaten ete e netted 1 2 Figure 1 1 Model 1825 c cece eee anaE eee E a teen neta aana 1 2 Figure 1 2 Model 1827 ccc cceecce eed ected tients canned oneness oeee ede neers evi ries 1 2 Description of EQuIPMeNt v 24 c00 cc000 dae es ceca ieee ed cet deeded teed dene 1 3 Functional DeSCriptiOn cece cece eee teeta aetna eed 1 3 Physical Description sisincisonir aane keene iE E deeds EREE 1 3 SPECIFICATIONS ena an aaia a Ga deen DEEA EAE EA A a 1 4 Table 1 1 Physical and Electrical Specifications scccccceecreeerrerree 1 4 Additional Equipment cccc cece cece eea aE eee 1 5 Table 1 2 Additional Equipment Required cc ceceeee eee teeta eee teeta ea eee 1 5 Applica tiO Soria nania o Eaa She aT DEAE a aE AAE Vandana pie E DAES 1 5 Figure 1 3 Typical Setup for Power Sensor Calibration using 1825 1 5 Figure 1 4 Typical Setup for Power Sensor Calibration using 1827 1 6 lI PREPARATION FOR USE
12. testes 3 6 RF Power Level Measurement with a DVM and an RVG seeen 3 7 Figure 3 5 Connections for Using the 1825 or 1827 with an RVG 3 7 RF Power Sensor Calibration Factor cccecee cece cnet e teeta e teen a teeta ened 3 8 Calibrating Sensors with a Reference CF cceceeee cece eee eee ee teeta eene eee 3 9 Calibrating Sensors Using an Adapter or Attenuator ceceeeeeeee ee 3 9 Additional Information cece eee ee enna ene e ened 3 10 IV THEORY OF OPERATION ccccsceeeeeeeeeeeceeeeeeeuaeeeuaeeeuaeeauaeeauaeeauaeeauaeeauaeeauaeeauaeeas 4 1 Principal of DC Substitution 2 0 0 eect eens teen e eee ne ened 4 2 Precision Power Measurement ccc cece eee eee eee eee nett ae tata t neta ened 4 2 Self Balancing Bridge Circuits cece cece eee eee ee teeta eee eee a eaten 4 2 Figure 4 1 Simplified Schematic of the 1825 1827 Bridge Circuit 4 3 Power MeaSurements c cece cece eee eee eee eee eee eee ene eee eee nee e taser eee 4 3 Controlling Thermistor Temperature 0 cceceeee eect ee eee eee teeta eae e eee 4 4 Figure 4 2 Simplified Schematic of the 1825 1827 Heater Circuit 4 5 Calculating Uncertainty cece eect eee teeta tee neta 4 5 Mismatch Uncertainty Meg cccccceeceeeeeeeeeceeeaeeeeeeeeeeeeeeaeeeanecaneeneeenenas 4 6 Gamma Correction cece eee eee eee neta aetna ene e teens 4 6 Instrumentation Uncertaint
13. the RF power off V at each different frequency point As long as the Model 1825 1827 has been turned on for at least two hours it should be thermally stable and this value should not change during a calibration Check V often during the first few calibrations and then determine how often it should be checked for the most time efficient and accurate calibration possible Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 10 Theory of Operation INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION SERVICE INFORMATION Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 4 1 TEGAM Theory of Operation Principle Of DC Substitution The Model 1825 and 1827 use the principle of DC substitution to measure RF power DC substitution refers to the measurement of RF power according to the amount of DC power that must be substituted for the RF power in a bolometer in order to cause equivalent thermal effects Since some of the RF power applied to the input of the power standard is lost by reflection and other causes before it is applied to the thermistor element the calibration factor of the standard is applied by the following formula to determine the actual level of RF power Pre Pac K2 Where Par Level of applied RF power Pac DC substituted power which is proportional to the applied RF power K2 calibration factor of Model 1825 1827 traceable to NIST Precision Power
14. the applied RF power K2 calibration factor of Models 1825 or 1827 traceable to NIST RF Power Sensor Calibration Factor Once the power level being applied to the SUT is measured the sensor s calibration factor can be determined Simply take a power reading in mW from the SUT s power meter and divide that by the power level obtained from the previous section Prge This ratio is the sensor s calibration factor The calibration factor of the sensor is defined by Kis Pm Pre Where Kis cal factor of the SUT Pm power reading from the power meter Prr Level of applied RF power Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 8 TEGAM Operating I nstructions That equation can also be written Kis Pm Kz2 Pac Where Kis cal factor of the SUT Pm power reading from the power meter K calibration factor of Model 1825 or 1827 traceable to NIST Pac DC substituted power which is proportional to the applied RF power The cal factor can also be expressed as a percentage To do this simply multiply the cal factor Kis by 100 Calibrating Sensors With A Reference CF Often power sensors are calibrated with a Reference Calibration Factor CF This Reference CF is used to align the meter and the sensor using the power meter s reference output typically 50 MHz When the sensor is calibrated with a Reference CF all the calibration factors of the sensors are relative to a power
15. your instrument unpack all of the items from the shipping carton and inspect for any damage that may have occurred during transit Report any damaged items to the shipping agent Retain and use the original packing material for reshipment if necessary Upon Receipt inspect the carton for the following items Model 1825 or 1827 RF Power Sensor Calibrator Model 1825 and 1827 Operating Manual CD P N 1825 901 01CD 3 5 floppy disk with Cal Factor Calculator Microsoft Excel Spreadsheet Power Cord P N 068 21 Mounting The Model 1825 and 1827 are shipped with four plastic feet mounted to the bottom cover When the Model 1825 1827 is placed on a bench or table these feet support the instrument The Model 1825 or 1827 can also be rack mounted in a standard 19 rack using the optional rack adapter kit RM 1825 A Safety Information amp Precautions The following safety information applies to both operation and service personnel Safety precautions and warnings may be found throughout this instruction manual and the equipment These warnings may be in the form of a symbol or a written statement Below is a summary of these precautions Terms in This Manual CAUTION statements identify conditions or practices that could result in damage to the equipment or other property WARNING statements identify conditions or practices that could result in personal injury or loss of life Terms as Marked on Equipment CAUTION indicates a
16. 05 to 125 Vac standard or 210 to 250 Vac with a factory installed option Input Power Fuse Slo Blo 0 8 Amp for 110 Vac or 0 5 Amp for 220 Vac Slo Blo 0 8 Amp for 110 Vac or 0 5 Amp for 220 Vac Weight 16 2 Ibs 7 3 kg 17 7 lbs 8 03 kg Physical Dimensions Height Width Depth 3 5 in 88 9 mm 18 in 457 2 mm 15 4 in 391 2 mm 3 5 in 88 9 mm 18 in 457 2 mm 15 4 in 391 2 mm Rack Mounting 1 4 Can be mounted in a standard 19 rack with rack mount kit RM 1825 Can be mounted in a standard 19 rack with rack mount kit RM 1825 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual TEGAM Instrument Description Additional equipment Table 1 2 lists the additional equipment required to calibrate RF power sensors with the Model 1825 and 1827 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 information Table 1 2 Additional Equipment Required Signal Generator Continuous Wave 6dBm minimum power output 10 MHz to 18GHz Frequency Range for Model 1825 100 kHz to 18 GHz Frequency Range for Model 1827 two may be required
17. 1825 RF Power Sensor Calibrator Before any measurements are taken the Model 1825 must be connected as shown in Figure 3 3 The RF IN is connected to the output of the chosen signal generator which should be 50 Ohm Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 4 TEGAM Operating I nstructions nominal impedance The RF IN is a female SMA connector any adapters used to connect it to the signal generator output are referenced out and should not affect the sensor calibration However proper care cleaning and torquing of coaxial connectors should be practiced to reduce insertion loss and extend the life of the connectors Also a low loss coaxial cable is recommended to avoid an excessive power loss The VOLTMETER red and black connectors are connected to the DVM DC voltage positive and negative input connectors respectively The VOLTMETER connectors are binding posts banana jacks so banana plugs or spade lugs will mate with them Connect the Sensor Under Test SUT to an appropriate power meter Zero and cal the power meter and sensor in accordance with the manufacturer s operating instructions The input of the SUT connects to the 50 Ohm N type female SENSOR connector on the Model 1825 If any adapters attenuators or matching pads are needed they should be characterized and taken into account as described later in this chapter Signal Generator DVM Power Meter RF
18. A Slo Blo fuse AC INPUT PONER FUSE Ga mo Figure 5 1 Location of the FUSE The fuse is located between the AC INPUT POWER connector and the FLOAT GROUND switch on the rear panel as depicted in Figure 5 1 To replace the fuse remove the fuse cap by inserting a flat screwdriver into the slot in the cap and rotate about counter clockwise The cap and fuse will spring out replace the fuse Align the tab on the fuse cap with the notch on the fuse housing push the cap and fuse into the housing and turn the cap Y4 clockwise with a flat screwdriver to lock the cap down Preparation for Repair or Calibration Service Once you have verified that the cause for the Model 1825 or 1827 malfunction cannot be solved in the field and the need for repair and calibration service arises contact TEGAM customer service to obtain an RMA Returned Material Authorization number You can contact TEGAM customer service via the TEGAM website www tegam com or by calling 440 466 6100 OR 800 666 1010 The RMA number is unique to your instrument and will help us identify your instrument and to address the particular service request by you which is assigned to that RMA number Of even more importance is a detailed written description of the problem which should be attached to the instrument 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 descrip
19. MODELS 1825 amp 1827 Economical Power Sensor Calibrators Instruction Manual PN 1825 901 01CD Publication Date April 2007 REV E TEGAM INC MODELS 1825 amp 1827 ECONOMICAL POWER SENSOR CALIBRATORS MODEL 1825 MODEL 1827 Instruction Manual PN 1825 901 01CD Publication Date April 2007 REV E 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 TEGAM is a manufacturer of electronic test and measurement equipment for metrology calibration and production test We also provide repair calibration and other support services for a wide variety of test and measurement equipment including RF power sensor calibration systems RF attenuation measurement systems resistance standards ratio transformers arbitrary waveform generators micro ohmmeters 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 information about TEGAM and our products please visit our website at www
20. Measurement The Model 1825 and 1827 RF Power Sensor Calibrators and a digital voltmeter with a 6 digit resolution combine to provide the precision power measurement system This system features the Model 1825 1827 closed loop self balancing Type IV Bridge circuit consisting of two legs a precision resistance leg 200 ohms and a leg linked to a thermistor element in the Model 1825 1827 power standard A thermistor is a type of bolometer whose resistance decreases as a function of increasing heat associated with ambient temperature or applied power This system also features the Model 1825 1827 temperature control circuitry that temperature stabilizes the thermistor element This eliminates changes in the thermistor element s resistance due to ambient temperature changes and thus isolates the causes of thermistor variation to the application of RF and DC power only Self Balancing Bridge Circuits The Model 1825 and 1827 contain a bridge circuit that performs DC substitution Figure 4 1 shows a simplified schematic of the bridge circuit in the Model 1825 and 1827 The self balancing bridge circuit in a closed loop configuration consists of two legs a precision resistance leg 200 ohm and a leg containing a thermistor element The precision resistance leg maintains a constant effective resistance value of 200 ohms When the power standard is temperature stabilized by the temperature control circuit thermistor resistance varies solely due to the appl
21. Out oa ke yn RF IN RED BLACK SENSOR VOLTMETER Model 1825 Figure 3 3 1825 Connections for Power Sensor Calibration Connecting The Model 1827 RF Power Sensor Calibrator The Model 1827 is connected much the same way as the Model 1825 The only difference is the fact that the Model 1827 has two RF IN connectors The purpose of having two RF IN connectors is to accommodate two signal generators Often it is necessary to use two signal generators to cover the entire frequency range of the 1827 The RF inputs are activated using a toggle switch and an LED next to each output indicates which is active This way signal sources can be changed just by flipping a switch without disconnecting and reconnecting RF cables Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 5 TEGAM Operating I nstructions High Frequency Signal Generator RF Out Power Meter Low Frequency Signal Generator RE Out a RF IN2 RED BLACK SENSOR VOLTMETER Ay RF IN1 Model 1827 Figure 3 4 1827 Connections for Power Sensor Calibration RF Power Level Measurement The Model 1825 and 1827 precisely measure RF power in terms of a DC voltage change across the Model 1825 1827 bridge circuit This instrument measures the voltage change with a at least 6 digit resolution digital voltmeter DVM or the same DVM and reference voltage generator RVG to obtain greater precision The following paragraphs describe these two metho
22. T Reflection Coefficient is a complex number expressed as a vector quantity A vector quantity has two components a magnitude and phase angle The magnitude of the reflection coefficient is symbolized by the Greek letter rho p and the phase angle by the Greek letter phi 6 Often the magnitude is the only part of the reflection coefficient used which will yield a worse case mismatch uncertainty Sometimes the Standing Wave Ratio SWR of a device is given rather than the reflection coefficient T SWR is a scalar quantity and related to p follows p S 1 S 1 Where p magnitude of the reflection coefficient S Standing Wave Ratio SWR Impedance mismatch between all devices connected to the SENSOR port of the 1825 1827 should be included in Mer That means the reflection coefficient or VSWR of any adapter attenuator or matching pad used should be known To include these devices use the equations above to determine the mismatch uncertainty between each device that is connected together Mer is the sum of those mismatch uncertainties Gamma Correction If both the p and 9 of the reflection coefficient are known for both the SUT and 1825 1827 TEGAM provides this data as part of the calibration for the 1825 1827 then Gamma corrections can be applied to the calibration factor of the SUT Applying Gamma corrections to the calibration factor reduces the total uncertainty of the calibration by eliminating Mer Gamma corrections are
23. ce leg is proportional to the amount of RF power applied to the thermistor element Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 4 2 TEGAM Theory of Operation VOLTMETER RED BLACK O O 200 Q o 15V Figure 4 1 Simplified Schematic of the Model 1825 1827 Bridge Circuit Power Measurements The precision measurement system measures RF power in terms of a power change across the precision resistance leg A digital voltmeter measures voltage across the precision resistance leg which can be used to determine the power by the following equation P _ V 200 Where P power across the precision resistance leg V voltage measured across the precision resistance leg 200 resistance value of precision resistance leg The RF power introduced to the thermistor is directly proportional to the change in DC power across the precision resistor The change in DC power across the precision resistor leg is given by AP Py al P2 Where AP the change in power across the precision resistance leg when RF power is applied to the thermistor leg P power across the precision resistance leg without RF power applied P2 power across the precision resistance leg with RF power applied Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 4 3 TEGAM Theory of Operation To determine the power across the precision resistance leg without RF power applied measure
24. ds of measurement RF Power Measurement With DVM Only The Model 1825 and 1827 do not measure the RF power level directly Instead a DVM measures DC voltages before and after the application of RF power to the thermistor in the Model 1825 1827 This necessitates calculation of the RF power level using data obtained from the DVM measurements To calculate the RF power level applied to the thermistor element configure the Model 1825 or 1827 and the DVM according to Figure 3 3 or 3 4 and measure the voltage across the bridge with the DVM before the application of RF power and record it as V Then measure the voltage across the bridge after applying RF power and record that measurement as V2 Determine the RF power level using the following steps First calculate the level of proportional DC substituted power from the operating resistance and DVM readings with the equation Pac Vi V2 200 Where V DVM reading across the bridge in the absence of RF power V2 DVM reading across the bridge with RF power applied 200 nominal resistance of the 1825 thermistor in Ohms Pac DC substituted power which is proportional to the applied RF power Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 6 TEGAM Operating I nstructions Next calculate the applied RF power level using the applicable calibration factor provided with the Model 1825 or 1827 and the level of DC substituted power Pre Pac K2 Where Prr
25. e ratio of the two power levels is the SUT s calibration factor Refer to Section III for a more detailed discussion of the functionality of these instruments Physical Description Refer to Table 1 1 for the physical and electrical specifications of the Model 1825 and 1827 The Model 1825 front panel contains the INPUT POWER switch as well as the SENSOR RF IN and VOLTMETER connectors The Model 1827 front panel contains the same except there are two RF inputs RF IN1 and RF IN2 with an LED indicator next to each and a toggle switch to select which RF input is used The rear panel of both contain the input power connector and fuse FLOAT GROUND switch and vents for airflow Both models are designed to sit on a bench but can be mounted in a 19 rack with rack mount kit RM 1825 sold separately call TEGAM for details Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 1 3 TEGAM Instrument Description Specifications Table 1 1 lists the physical and electrical specifications of the Model 1825 and 1827 Table 1 1 Physical and Electrical S Model 1825 pecifications 1827 Frequency Range 10 MHz to 18 GHz 100 kHz to 18 GHz Power Range 0 01 to 25 mW 20 to 14 dBm 0 01 to 25 mW 20 to 14 dBm DC Substitution Bridge Accuracy 0 003 0 003 RF Impedance 50 Ohms nominal 50 Ohms nominal SWR SENSOR Power Linearity lt 1 14 lt 0 1 from 1 to 10 mW l
26. emperature 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 When the operating temperature is reached the heater windings provide equal resistance and the bridge balances The temperature is determined such that the thermistor bead bias power is 30mW 0 7 mW Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 4 4 TEGAM Theory of Operation U2 i a a w e READY fy VY Figure 4 2 Simplified Schematic of the Model 1825 1827 Heater Circuit U1 a high gain amplifier with excellent offset drift characteristics senses imbalances across the bridge U1 U2 interaction provides a varying response to thermal bridge imbalances according to the relationship between the voltage differential inputs U1 U2 amplifies an imbalance signal from a cold bridge that forces the series pass transistor Q3 to pass a current proportional to the imbalance signal This current drives the bridge to restore balance As the bridge nears the steady state condition Q3 causes the READY LED to illuminate If the mount is cold the READY LED does not illuminate since the Darlington pair configuration made up by Q1 and Q4 is not ina conducting state U1 U2 responds to an imbalance signal from an overheated mount by turning off Q3 so that it passes no current to the heater
27. ication of RF and DC power Each leg uses an operational amplifier U1 or U2 to sense voltage imbalances and to drive transistors Q1 and Q2 to correct them The power supply assembly provides isolated 15 volt biasing to each op amp Since the voltage differential at the input stage of op amp U2 is negligibly small it provides a virtual common reference to op amp U1 i e it acts as a virtual common ground since the voltage approaches zero with respect to either ground This forces the current through the thermistor to equal the current through the precision resistance leg The application of RF power to the thermistor element creates a decrease in the voltage drop across the thermistor element due to its negative temperature coefficient This decreased voltage drop in turn creates an unbalanced bridge condition When resistance in the thermistor element leg of the bridge changes due to the application of RF power op amp U1 senses a voltage difference between Va and Va and causes V to equal Va When V equals Va the voltage across the thermistor element leg equals the voltage across the precision resistance leg Also the closed loop circuit configuration maintains equal current throughout the bridge Since the voltage and current throughout the circuit is equal the resistance in both halves is also equal Therefore when the thermistor mount s temperature is stabilized and RF power is applied a change in voltage across the precision resistan
28. nt condition A 0 8 Amp fuse is used with the standard 110 Vac power supply a 0 5 Amp is used with the optional 220 Vac power supply FLOAT GROUND Switch The FLOAT GROUND Switch is a two position toggle switch located on the rear panel This switch connects and disconnects the bridge board ground to chassis ground the up position connects the bridge board to ground and the down position disconnects the bridge board from ground floats Normal operation is with the switch in the GROUND up position If the LO input of the external DVM is grounded then the switch should be in the FLOAT down position Exhaust Fan The Exhaust Fan causes air to flow out of the Model 1825 1827 to keep the internal components from overheating Ensure there is at least two inches of space behind the instrument for proper airflow RF Power Sensor Calibration To determine the calibration factor the percentage of power applied to a power sensor that will actually be measured by the power meter the power measured by the sensor is compared to a known power level The known power level can either be set to a known level by a highly accurate source such as with the System II Automatic Calibration System or it can be accurately measured as with the Model 1825 or 1827 Contact TEGAM for more information on the System I1A Once the power level is known the calibration factor can be calculated The following paragraphs describe this process Connecting The Model
29. or READY LED Transistor Q2 and Resistor R16 combine to provide circuit protection by limiting current in the event of an output short circuit Calculating Uncertainty Measurement uncertainty when using the Model 1825 or 1827 can be calculated with the following formula Up V Uc le Mer Where Up uncertainty of the power measurement of the Model 1825 or 1827 Uc uncertainty of the cal factor for the Model 1825 or 1827 which is frequency dependent le the random part of the uncertainty of the instrumentation Mer mismatch error which is frequency dependent Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 4 5 TEGAM Theory of Operation Mismatch Uncertainty Mer Device mismatch is the term used to describe the differences in impedance between RF devices This difference in impedance causes some of the RF power to be reflected back from one device to another thus not all applied RF power is transferred from one device to another The amount of power that is not transferred can be characterized as the reflection coefficient or r The reflection coefficient for the Model 1825 and 1827 is included as part of the calibration data Mismatch error Mer is determined from the reflection coefficients of both the Model 1825 or 1827 and the SUT as follows Mer 1 1 1 Pa x T2 Where Mer residual mismatch error T reflection coefficient for the Model 1825 T2 reflection coefficient for the SU
30. or provides the RF power to the SUT The RF power applied to RF IN connector is applied equally to the SUT and the internal power standard The fact that equal RF power is applied to both the power standard and the SUT is what allows the calibration factor of the SUT to be determined VOLTMETER Connectors Both Models The VOLTMETER Connectors are spade lug connecting posts banana jacks These connectors complete the DC path between the Model 1825 and a digital voltmeter with at least 6 4 digit resolution DC voltage present across the VOLTMETER connectors is equivalent to the voltage across the thermistor element The red connector is for positive DC voltage and the black connector is for negative DC voltage RF IN Connector Model 1825 SMA female that connects to signal generator output The RF power that comes in this connector is applied equally to the SUT and the power standard The fact that equal RF power is applied to both the power standard and the SUT is what allows us to determine the calibration factor of the SUT There is about 6 to 9 5 dB of insertion loss in the RF IN path RF IN 1 and RF IN 2 Connectors Model 1827 Both are SMA female that connects to signal generator outputs Two inputs are provided because it is often necessary to use two different signal generators to cover the 100 KHz to 18 GHz frequency range of the Model 1827 The RF power that comes in this connector is applied equally to the SUT and the power s
31. personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself DANGER indicates a personal injury hazard immediately accessible as one reads the marking 2 2 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual TEGAM Preparation for Use Symbols As Marked in This Manual A This symbol denotes where precautionary information may be found As Marked on Equipment CAUTION Risk of Danger Earth Ground Terminal 4 DANGER Risk of Electric Shock On Off O mn Frame or Chassis Terminal l Earth Ground Terminal Os Alternating Current Grounding the Equipment This product is grounded through the grounding conductor of the power cord WARNING To avoid electrical shock or other potential safety hazards plug the power cord into a properly wired receptacle before using this instrument The proper grounding of this instrument is essential for safety and optimizing instrument operation Danger Arising from Loss of Ground WARNING If the connection to ground is lost or compromised a floating potential could develop in the instrument Under these conditions all accessible parts including insulating parts such as keypads and buttons could develop a hazardous voltage and put the user at risk A Use the Proper Fuse To avoid fire hazard use only the correct fuse type as specified for the AC powe
32. r supply in the Instrument Description or Service Information sections of this manual Please note that the fuse rating for 100 120 volt power supply is different than the rating for 200 240 volt power supply Refer fuse replacement to qualified service personnel Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 2 3 TEGAM Preparation for Use Use in Proper Environment Normal calibration laboratory practice dictates that the environment should be closely controlled This will minimize errors introduced by temperature and humidity changes A nominal temperature of 23 C 73 4 F 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 Model 1825 and 1827 have a specified ambient temperature range of 12 to 32 C 54 to 90 F Operating beyond these limits can affect the accuracy of the instruments and damage internal circuitry CAUTION When the Model 1825 or 1827 is to be stored for extended periods pack the instrument into a container Place container in a clean dry temperature controlled location If instrument is to be stored in excess of 90 days place desiccant with items before sealing container The safe environmental limits for storage are 40 to 75 C 40 to 167 F at less than 95 non condensing relative humidity Do Not Use in Explosive Environment
33. ration factor of Model 1825 or 1827 traceable to NIST Controlling Thermistor Temperature The Model 1825 and 1827 contain a thermistor which is a temperature sensitive device In order to provide precise measurements the effects of changes in the ambient temperature upon the thermistor must be eliminated or minimized The Model 1825 1827 temperature controller accomplishes this by raising the power standard s internal temperature to a level higher than the ambient temperature approximately 60 C and maintaining that level by controlling the current applied to the power standard s heater element This prevents any thermistor imbalance due to ambient temperature change Therefore all temperature changes are due to the application of RF and DC power The temperature control circuit performs two basic functions control the temperature of the thermistor element and illuminate the READY LED when the power standard has reached its operating temperature Refer to Figure 4 2 for the following discussions concerning the temperature control circuit The Wheatstone Bridge composed of R1 R2 R3 and R4 is actually wire wound around a thermal mass and not only heats the mass but also detects the temperature of it The wiring heats the mass to a temperature above the ambient temperature The thermistor beads are mounted on this thermal mass and insulation surrounds the assembly to improve temperature stability Two windings represented as R1 and R2 of zero t
34. rostatic Discharge Sensitive NIST National Institute of Standards and Technology RF Radio Frequency DC Direct Current UUT Unit Under Test Figure 1 1 Model 1825 Figure 1 2 Model 1827 1 2 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual TEGAM Instrument Description Description Of Equipment Functional Description The Model 1825 is designed to calibrate power meter sensors in the 10 MHz to 18 GHz frequency range The Model 1825 does not have any settings or controls other than the POWER and FLOAT GROUND switches Measurements are made with an external DVM supplied by the user The Model 1825 provides accurate measurements for standard calibration points that are directly traceable to the National Institute of Standards and Technology NIST The Model 1827 calibrates power meter sensors in the 100 kHz to 18 GHz frequency range Since most single RF signal generators do not cover this entire frequency band it is usually necessary to use two For this reason the Model 1827 has two RF signal generator inputs that are selected by a front panel switch Measurements are made as with the Model 1825 Both the Models 1825 and 1827 precisely and accurately detect RF power through a temperature controlled thermistor power standard and DC substitution bridge This enables the operator to accurately calculate an RF power level which is then used for comparison with the power level measured by the Sensor Under Test SUT Th
35. s CAUTION The 1825 1827 is not designed for operation in explosive environments Do Not Block Air Vents on Rear Panel CAUTION The Model 1825 and 1827 have an air intake and exhaust on the back panel of the instrument When installing the Model 1825 1827 ensure there is at least two inches of space behind the instrument for airflow DO NOT set the instrument on its rear panel as its airflow will be restricted and may result in damage to the internal circuitry Do Not Operate Without Covers WARNING This device should be operated with all panels and covers in place Operation with missing panels or covers could result in personal injury amp AC INPUT POWER FUSE ug e a FLAT Figure 2 1 Model 1825 and 1827 AC INPUT POWER and FUSE location w FOR QUALI FI ED SERVI CE PERSONNEL ONLY A Servicing Safety Summary Do Not Service Alone Do not perform service or adjustment on this product unless another person capable of rendering first aid is present 2 4 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual TEGAM Preparation for Use 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 unplugging the instrument when removing panels soldering or replacing components WARNING The ins
36. ssssssssssssrerrerssrsrrersrrrrrsrsrrrrransrerrnnnererenanerernn 2 4 Use Care when Servicing with Power On or Off cccceee esse ee ee teen ee ened 2 5 Pwer SOUNCE cs shar teed exadcncnaanndunlueianitinileu a ea a a aa ai aa ved enc 2 5 Line Voltage Selection escrire rinine iiae a a aT 2 5 IHI OPERATI NG INSTRUCTI ONG cccccceesceeeeceeeeeeeeeceeeeceeeseeeeeeeeeaseaeesuauseeaeseuansgeas 3 1 1825 and 1827 Front Panel Description ccc cece cece e eee nett teen ee teeta ed 3 2 Figure 3 1 Model 1825 and 1827 Front Panel cc cece eeeeeeee testes eae ee 3 2 1825 and 1827 Rear Panel Description cece cece eee ee eee eee ee eee ee teeta ed 3 4 Figure 3 2 Model 1825 and 1827 Rear Panel ceceeeeeeeeeee seat ee ea eee 3 4 RF Power Sensor Calibration cccecceeeee eee eee eee eee eee ee nate eee nena ened 3 4 Connecting the Model 1825 RF Power Sensor Calibrator eee 3 5 Figure 3 3 1825 Connections for Power Sensor Calibration 3 5 Connecting the Model 1827 RF Power Sensor Calibrator e 3 5 Figure 3 4 1827 Connections for Power Sensor Calibration 3 6 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual C TEGAM Table of Contents RF Power Level Measurement 0 ccceeeee eee e ee teen eee e eee a eee eee ee ened 3 6 RF Power Level Measurement with a DVM onllly ceeeeeeee
37. t 1 14 lt 0 1 from 1 to 10 mW Insertion Loss RF IN 6 dB nominal 9 5 dB max 6 dB nominal 10 dB max Individual calibrations traceable to NIST supplied at the following frequencies 10 to 100 MHz in 10 MHz steps 0 1 to 2 GHz in 50 MHz steps 2 to 4 GHz in 100 MHz steps 4 to 12 4 GHz in 200 MHz steps 12 75 to 18 GHz in 250 MHz steps 100 200 455 kHz 1 1 25 3 5 MHz 10 to 100 MHz in 10 MHz steps 0 1 to 2 GHz in 50 MHz steps 2 to 4 GHz in 100 MHz steps 4 to 12 4 GHz in 200 MHz steps 12 75 to 18 GHz in 250 MHz steps Calibration Factor Accuracy 1 00 from 0 01 to 10 GHz 1 10 from 10 to 18 GHz 0 80 from 0 1 to 10 MHz 1 00 from 0 01 to 10 GHz 1 10 from 10 to 18 GHz Calibration Factor Drift lt 0 5 per year lt 0 5 per year Connectors SENSOR RF IN VOLTMETER N type Female SMA Female Binding Post standard 0 75 spacing for banana plugs N type Female SMA Female X2 Binding Post standard 0 75 spacing for banana plugs Temperature Operating Storage 12 to 32 C 54 to 90 F 40 to 75 C 40 to 167 F 12 to 32 C 54 to 90 F 40 to 75 C 40 to 167 F Warm up time Power Requirements 2 hours minimum from instrument 100VA 50 to 400 Hz 105 to 125 Vac standard or 210 to 250 Vac with a factory installed option 2 hours minimum from instrument power up 100VA 50 to 400 Hz 1
38. tandard The fact that equal RF power is applied to both the power standard and the SUT is what allows us to determine the calibration factor of the SUT There is about 6 to 10 dB of insertion loss in the RF IN path RF IN 1 RF IN 2 Switch Model 1827 Toggle switch that is used to select which RF Input is active The switch position indicates which input is active When the switch is up RF IN 1 is active when the switch is down RF IN 2 is active This switch allows RF sources to be changed without disconnecting and reconnecting cables RE IN 1 and RF IN 2 Indicators Model 1827 This green LED illuminates when the RF input next to it is active Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 3 TEGAM Operating I nstructions S EAV AC INPUT POMER D602 gt ae Model 1825 and 1827 Rear Panel Description 5 244 mee OO Air Vent AC INPUT POWER AC input FLOAT GROUND Exhaust Fan with Filter connector power FUSE switch Figure 3 2 Model 1825 and 1827 Rear Panel Air Vent with Filter Air Vent allows air to flow into the Model 1825 1827 to keep the internal components from overheating The filter keeps debris from entering the instrument Ensure there is at least two inches of space behind the instrument for proper airflow AC INPUT POWER connector Three prong connector mates with AC power cord supplied with unit AC input power FUSE Protects instrument from an over curre
39. tion should include information such as measurement range trigger mode type of components being tested is the problem intermittent when is the problem most frequent has anything changed since the last time the instrument was used etc Any detailed information provided to our technicians will assist them in identifying and correcting the problem in the quickest possible manner Use the Expedite Repair amp Calibration form provided on the next page to provide detailed symptoms of the instrument s problem Once this information is prepared and sent with the instrument and RMA number to our service department we will do our part in making sure that you receive the best possible customer service and turnaround time possible Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 5 3 TEGAM Service I nformation Expedite Repair amp Calibration Form Use this form to provide additional repair information and service instructions The completion of this form and including it with your instrument will expedite the processing and repair process RMA Instrument Model Serial Company Number Technical Contact Phone Number Additional Contact Info Repair I nstructions LI Evaluation LI Calibration Only L Repair Only L Repair amp Calibration LI A2LA Accredited Calibration Extra Charge Detailed Symptoms Include information such as measurement range instrument
40. to cover entire Frequency Range DVM DC Volts 6 digit minimum RF Power Meter Compatible with the sensor under test APPLICATIONS The TEGAM Model 1825 and 1827 Power Sensor Calibrator was designed for the transfer of calibration factors to power meter sensors While neither model is designed for remote programming the process of calibrating power sensors can be automated if the additional equipment used can be remotely programmed Figure 1 3 Typical Setup for Power Sensor Calibration using Model 1825 Signal Generator DVM Power Meter RF Out re H wn RF IN VOLTMETER SENSOR Model 1825 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 1 5 TEGAM Instrument Description Figure 1 4 Typical Setup for Power Sensor Calibration using Model 1827 High Frequency Signal Generator RF Out Power Meter Low Frequency Signal Generator RF Out RF IN1 RF IN2 VOLTMETER SENSOR Model 1827 1 6 Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual Preparation for Use INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION SERVICE INFORMATION Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 2 1 TEGAM Preparation for Use Unpacking amp Inspection Each 1825 and 1827 is put through a series of electrical and mechanical inspections before shipment to the customer Upon receipt of
41. trument power source is electronically controlled meaning that there is power present throughout the instrument even when the instrument is in the OFF state Always unplug the instrument and wait 5 minutes before accessing internal components Power Source This product is intended to connect to a power source that will not apply more than 250V RMS between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation A N Line Voltage Selection CAUTION DO NOT APPLY POWER TO THE INSTRUMENT BEFORE READING THIS SECTION The standard power supply in a Model 1825 or 1827 operates with a line voltage of 105 to 125 Vac at 50 to 400 Hz A 210 to 250 Vac power supply can be ordered as a factory installed option Each power supply requires a different fuse It is strongly recommended that the line voltage frequency and fuse type be verified for the type of power supply in the unit before powering it Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 2 5 Operating I nstructions INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION SERVICE INFORMATION Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 3 1 TEGAM Operating I nstructions Model 1825 and 1827 Front Panel Description
42. ustomer 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 longer Warranty Limitations The TEGAM Inc warranty does not apply to defects resulting from unauthorized modification or misuse of the product or any part This warranty does not apply to fuses batteries or damage to the instrument caused by battery leakage Statement of Calibration This instrument has been inspected and tested in accordance with specifications published by TEGAM Inc The accuracy and calibration of this instrument are traceable to the National Institute of Standards and Technology through equipment which is calibrated at planned intervals by comparison to certified standards maintained in the laboratories of TEGAM Inc Contact I nformation TEGAM INC 10 TEGAM WAY GENEVA OHIO 44041 PH 440 466 6100 FX 440 466 6110 EMAIL sales tegam com Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 5 2 TEGAM Service I nformation Changing the Power Fuse Different fuses must be used for different power supplies For the standard 105 125 Vac power supply use a 0 8A Slo Blo fuse For the optional 210 250 Vac power supply use a 0 5
43. y le ccccceccecseeneeeeeeeeeeeeeeaeeuaeeuseeeneeenenas 4 7 Table 4 1 Typical Instrumentation Error Analysis lg eeeeeeee es 4 7 VI SERVI CE INFORMATION cccceeceeeeeeeeeeeeeeeeeeeeeeeeuaeeeeaeeeueeeeuaeeauaseauaseauaeeaueeeauanes 5 1 Wai ranty scair aaa stems EE E E EAE EAE ET e a ADATE NEA 5 2 Warranty Limitations asiriene E EEE E ECEE EE 5 2 Statement of Calibration s ssssssssssssssssrnrsrsrrrrrsrsrrrrrrrsrrrrrrnererrrrnerrerrnnnet 5 2 Contact Information sriacsir ernari ee ERa adado nea 5 2 Changing the Power FuSe a sssssssensrrssnrnnrnnnsnnuarnnnunnnennnnusrnuarinnsnunnennnnnnne 5 3 Figure 5 1 Location Of the FUS Eruirseresorineicdiii tinned inr a aean 5 3 Preparation for Calibration or Repair Service sssssssssssssserrrsssrrrrrsesrrrrrssse 5 3 Expedite Repair amp Calibration FOrm cccceceeeee eens ee ease este eeeeaeaeeneaees 5 4 d Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual Instrument Description INSTRUMENT DESCRIPTION PREPARATION FOR USE OPERATING INSTRUCTIONS THEORY OF OPERATION SERVICE INFORMATION Model 1825 and 1827 RF Power Sensor Calibrator Instruction Manual 1 1 Instrument Description Abbreviations And Acronyms The following list contains all abbreviations used throughout this manual Abbreviations and acronyms that are not listed conform to MIL STD 12D CW Continuous Wave SUT Sensor Under Test DVM Digital Voltmeter ESDS Elect
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