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N8480 Series Power Sensors Operating and Service Guide

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General Safety Information

The following general safety precautions must be observed during all
phases of operation, service, and repair of this instrument. Failure to
comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended
use of the instrument. Keysight Technologies assumes no liability for the
customer’s failure to comply with these requirements.

WA R N I N G

Before connecting the power sensor to other instruments ensure that all
instruments are connected to the protective (earth) ground. Any
interruption of the protective earth grounding will cause a potential
shock hazard that could result in personal injury.

C A U T I O N

•

Use the instrument with the cables provided.

•

Repair or service that is not covered in this manual should only be
performed by qualified personnels.

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Summary of Contents for N8480 Series

Page 1: ...Keysight N8480 Series Power Sensors Operatingand Service Guide ...

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Page 4: ...aterial in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accor dance with the terms of such license Restricted Rights Legend U S Government Restricted Rights Soft ware and technical data rights granted ...

Page 5: ...nger refer to this manual for specific Warning or Caution information Earth ground terminal Caution hot surface Protective conductor terminal Out position of a bi stable push control Frame or chassis terminal In position of a bi stable push control Equipotentiality Equipment protected throughout by double insulation or reinforced insulation This symbol indicates that a device or part of a device m...

Page 6: ...the Spectrum management Agency of Australia This signifies compliance with the Australian EMC Framework regulations under the terms of the Radio Communications Act of 1992 This ISM device complies with the Canadian ICES 001 Cet appareil ISM est conforme à la norme NMB 001 du Canada This product complies with the WEEE Directive 2002 96 EC marking equipment The affixed product label indicates that y...

Page 7: ...and intended use of the instrument Keysight Technologies assumes no liability for the customer s failure to comply with these requirements WARNING Before connecting the power sensor to other instruments ensure that all instruments are connected to the protective earth ground Any interruption of the protective earth grounding will cause a potential shock hazard that could result in personal injury ...

Page 8: ...ot discard this electrical electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this instrument is classified as a Monitoring and Control Instrument product The affixed product label is shown as below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight office or vi...

Page 9: ...ents Temperature 0 C to 55 C Operating Humidity Up to 95 at 40 C Altitude Operating up to 4 600 metres 15 000 feet Environmental Conditions Requirements Temperature 40 C to 70 C Non operating Humidity Non operating up to 90 at 65 C Non condensing Altitude Non operating up to 7 620 metres 25 000 feet CAUTION The N8480 Series power sensors complies with the following EMC requirements IEC 61326 1 200...

Page 10: ...DoC The Declaration of Conformity DoC for this instrument is available on the Web site You can search the DoC by its product model or description http www keysight com go conformity NOTE If you are unable to search for the respective DoC please contact your local Keysight representative ...

Page 11: ...w and operation of the N8480 Series power sensors 2 Specifications and Characteristics Chapter 2 describes the specifications and characteristics of the N8480 Series power sensors 3 Service Chapter 3 elaborates on the information about principle of operations troubleshooting and repair of the N8480 Series power sensors ...

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Page 13: ...ith the Instrument 3 Original Packaging 3 Power Meter and Sensor Cable Requirements 4 Interconnection and Calibration 5 Recommended Calibration Interval 6 Temperature Sensitivity 6 Operating Instructions 7 Modulation Effect 8 Torque 8 Overview of the N8480 Series Power Sensors 9 N8485A Power Sensor 12 N8487A Power Sensor 12 N8488A Power Sensor 13 B models and H models Information 13 Waveguide mode...

Page 14: ...ro Set Zero Drift and Measurement Noise 36 Settling Time 37 Calibration Factor and Reflection Coefficient 38 Calibration Factor Uncertainty 39 Supplemental Characteristics 43 Physical Characteristics 44 3 Service Cleaning 46 Connector Care 46 Principle of Operations 47 Performance Test 48 Standing Wave Ratio SWR and Reflection Coefficient Rho Performance Test 48 Zero Set Performance Test 51 Replac...

Page 15: ...ical SWR 33 MHz to 50 GHz 25 C 10 C for N8486AQ power sensor 28 Figure 2 7 Typical SWR 26 5 GHz to 40 GHz 25 C 10 C for N8486AR power sensor 28 Figure 2 8 Typical SWR 10 MHz to 18 GHz 25 C 10 C for N8481B power sensor 29 Figure 2 9 Typical SWR 100 kHz to 6 GHz 25 C 10 C for N8482B power sensor 29 Figure 2 10 Typical SWR 10 MHz to 18 GHz 25 C 10 C for N8481H power sensor 30 Figure 2 11 Typical SWR ...

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Page 17: ...35 Table 2 6 Zero set zero drift and measurement noise 36 Table 2 7 Settling time in normal and x2 mode 37 Table 2 8 Calibration factor uncertainty at 25 ºC 3 ºC 39 Table 2 9 Calibration factor uncertainty at 25 ºC 10 ºC 40 Table 2 10 Calibration factor uncertainty at 0 ºC to 55 ºC 42 Table 2 11 Physical dimensions 44 Table 3 1 Reflection coefficient for N8480 Series power sensors 25 ºC 10 ºC 49 T...

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Page 19: ...perature Sensitivity 6 Operating Instructions 7 Modulation Effect 8 Torque 8 Overview of the N8480 Series Power Sensors 9 N8485A Power Sensor 12 N8487A Power Sensor 12 N8488A Power Sensor 13 B models and H models Information 13 Waveguide models Information 14 Options 15 Power Meter Firmware Compatibility 16 Power Meter Configuration Changes 17 Measurement Accuracy and Speed 18 This chapter contain...

Page 20: ...ontains information about the initial inspection connections specifications operation and performance tests of the N8480 Series power sensors You can also find a copy of this guide on the EPM and EPM P Series Power Meter Documentation CD supplied with the power meter Figure 1 1 N8480 Series power sensors ...

Page 21: ...to those used in the factory packaging are available through Keysight Technologies office If the instrument is being returned to Keysight Technologies for servicing attach a tag indicating the type of service required return address model number and serial number Also mark the container FRAGILE to assure careful handling In any correspondence refer to the instrument by model number and serial numb...

Page 22: ...les Grey EPM Series power meters 11730A 1 5 m 5 ft cable length 11730B 3 m 10 ft cable length 11730C 6 1 m 20 ft cable length 11730D 15 2 m 50 ft cable length 11730E 30 5 m 100 ft cable length 11730F1 61 m 200 ft cable length operate up to 45 C E9288 Family Sensor Cables Blue EPM Series power meters1 EPM P Series power meters E9288A 1 5 m 5 ft cable length E9288B 3 m 10 ft cable length E9288C 10 m...

Page 23: ...o the power meter for zero and calibration The waveguide models power sensors have two inputs Type N connector for a 50 MHz 1 mW calibration signal generated by the power meter Waveguide flange to be connected to the test port during actual measurement CAUTION For power sensors with Type N connector connect the power sensor to the power meter by turning the nut only The power sensor can be damaged...

Page 24: ...r 3 Perform zeroing with the power sensor still connected to the test port Recommended Calibration Interval Keysight Technologies recommends a one year calibration cycle for the N8480 Series power sensors Temperature Sensitivity The sensitivity of the power sensor is influenced by ambient temperature The sensor should be recalibrated at each change in temperature to obtain the most accurate result...

Page 25: ... the two screws as indicated in Figure 1 3 located at the side of the flange Insert the remaining two screws to either side of the flange Tighten the four screws until finger tight 3 Tighten the flange using a calibrated torque wrench by going back and forth between each screws that are opposite to each others Tighten each screw with a small incremental torque until the desired torque is achieved ...

Page 26: ... the connector type for connection to DUT for the power sensor models A torque wrench must be used to tighten these connectors Only use a wrench set to the correct torque value 1 Balldriver is used to tighten the screws instead of the connector Table 1 2 RF connector type wrench size and torque values Model Option RF Connector Wrench Size Torque Value N8481A N8481A 100 Type N male 3 4 inch open en...

Page 27: ... N8480 Series power sensors are compatible with the EPM Series power meters E4418B E4419B N1913A and N1914A EPM P Series power meters E4416A and E4417A and P Series power meters N1911A and N1912A only The N8480 Series power sensors place a 50 W load on the RF or microwave source The power meter indicates the power dissipated in this load in mW or dBm The N8480 Series power sensors consist of four ...

Page 28: ... number serial number linearity temperature compensation calibration factor and so forth This feature ensures the correct calibration data is applied by any compatible power meter connected with N8480 Series power sensor and to ensure the accuracy of the measurements NOTE For B models power sensors the calibration factor data is valid only when the sensor is used with the supplied attenuator Table...

Page 29: ... balanced chopper and an AC coupled low noise amplifier The DC voltage is routed through gold wires to the chopper circuit which converts the low level DC voltage to an AC voltage To do this the chopper is controlled by a 440 Hz square wave generated by the power meter the chop signal The result is an AC output signal proportional to the DC input The AC signal is then amplified to a relatively hig...

Page 30: ...m connector as standard To convert the 2 4 mm m connector for calibration an adapter 2 4 mm f to Type N m is included with the power sensor See Figure 1 6 Figure 1 6 N8487A power sensor with adapter NOTE The 3 5 mm to Type N adapter is intended for the use of 1 mW 50 MHz power reference of the power meter only Its function as a calibration reference may be compromised if it is used for other purpo...

Page 31: ...s with 30 dB removable attenuator or H models with 20 dB attenuator power sensor is a calibrated combination of an attenuator assembly and a sensor assembly The attenuator and sensor assemblies are calibrated as a set and must be used together when a specified accuracies are to be obtained These combination is referred to as a power sensor NOTE The 2 4 mm to Type N adapter is intended for the use ...

Page 32: ...id the warranty The D ring that is available on the input connector located on the sensor is used to prevent the sensor from being connected to a high power source when an attenuator is not attached The sensors must only be connected to the power meter for calibration or to a high power attenuator for any RF measurements WARNING For B models power sensors only The high power attenuator contains a ...

Page 33: ... the calibration factor for a particular frequency prior to make a measurement or manually enter the sensors calibration factor table and select the frequency of the signal to be measured The calibration factor data is provided on the label attached to the power sensor s cover This calibration factor is used to make frequency dependent efficiency correction and it is unique to each sensors For Opt...

Page 34: ...ive power meter Web site located at www keysight com under Technical Support Drivers Software Firmware Update Table 1 4 Power meter firmware Power Meter Model Number Compatible Firmware Revision EPM Series power meters E4418B A1 09 01 and above E4419B A2 09 01 and above N1913A A 01 00 and above N1914A EPM P Series power meters E4416A A1 05 01 and above E4417A A2 05 01 and above P Series power mete...

Page 35: ...ed Figure 1 8 Auto averaging settings Sensor Power Minimum Sensor Dynamic Range 1 2 3 4 1 1 2 8 Resolution Setting Number of Averages 2 2 4 32 2 4 32 2 2 16 256 2 8 128 128 Maximum 4 64 256 512 Upper Range Lower Range Sensor Power 0 dBm 1 dBm 30 dBm 10 dBm 20 dBm 2 20 dBm 17 dBm 10 dBm 10 dBm 0 dBm N8481 2H 30 dBm 29 dBm 0 dBm 20 dBm 10 dBm N8481 2B N8481 2 5 7 8A N8486AQ AR NOTE These values are ...

Page 36: ...haracteristics such as crest factor or duty cycle may cause the power meter to select a range which is not the optimum configuration for your specific measurement needs Signals with average power levels close to the range switch point require you to consider your needs for measurement accuracy When measuring pulse signals you are recommended to select manual filtering This allows you to choose the...

Page 37: ...ncy and Dynamic Power Range 22 Damage Level 23 Maximum SWR 24 Power Linearity 31 Switching Point 35 Zero Set Zero Drift and Measurement Noise 36 Settling Time 37 Calibration Factor and Reflection Coefficient 38 Calibration Factor Uncertainty 39 Supplemental Characteristics 43 Physical Characteristics 44 This chapter contains information about specifications and characteristics of the Keysight N848...

Page 38: ...er sensors by giving typical but non warranted performance parameters These characteristics are shown in italics or denoted as typical nominal or approximate Characteristic information is representative of the product In many cases it may also be supplemental to a warranted specification Characteristic specifications are not verified on all power sensors The types of characteristic specifications ...

Page 39: ...pecification These specifications are referred to as typical Typical plots are derived from a population mean from production testing Plot shown may vary from unit to unit and is not warranted For warranted specifications refer to the individual tables Conditions The power meter and power sensor meet its specifications when Stored for a minimum of two hours at a stable temperature within the opera...

Page 40: ... N8480 Series power sensors except Option CFT Table 2 1 Frequency and dynamic power range Sensor Option Sensor Model Frequency Range Dynamic Power Range Standard N8481A 10 MHz to 18 GHz 35 dBm to 20 dBm N8482A 100 kHz to 6 GHz N8485A 10 MHz to 26 5 GHz N8485A Option 033 10 MHz to 33 GHz N8487A 50 MHz to 50 GHz N8488A 10 MHz to 67 GHz 67 GHz to 70 GHz N8486AR 26 5 GHz to 40 GHz N8486AQ 33 GHz to 50...

Page 41: ... 33 GHz N8487A 50 MHz to 50 GHz N8486AR 26 5 GHz to 40 GHz N8486AQ 33 GHz to 50 GHz N8481B 10 MHz to 18 GHz 0 dBm to 44 dBm N8482B 100 kHz to 6 GHz N8481H 10 MHz to 18 GHz 10 dBm to 35 dBm N8482H 100 kHz to 6 GHz Table 2 1 Frequency and dynamic power range Table 2 2 Damage level at average and peak power Sensor Model Damage Level Average Power Damage Level Peak Power N8481A N8482A N8485A N8487A N8...

Page 42: ... 1 54 1 17 1 06 1 07 1 57 1 17 1 06 1 08 N8485A 10 MHz to 50 MHz 50 MHz to 100 MHz 100 MHz to 2 GHz 2 GHz to 12 4 GHz 12 4 GHz to 18 GHz 18 GHz to 26 5 GHz 26 5 GHz to 33 GHz1 1 33 1 08 1 05 1 14 1 19 1 26 1 32 1 53 1 11 1 07 1 14 1 20 1 28 1 36 N8487A 50 MHz to 100 MHz 100 MHz to 2 GHz 2 GHz to 12 4 GHz 12 4 GHz to 18 GHz 18 GHz to 26 5 GHz 26 5 GHz to 40 GHz 40 GHz to 50 GHz 1 08 1 05 1 10 1 16 ...

Page 43: ... Maximum SWR 25 C 10 C 0 C to 55 C N8486AR 50 MHz2 26 5 GHz to 40 GHz 1 17 1 40 1 20 1 40 N8486AQ 50 MHz2 33 GHz to 50 GHz 1 17 1 50 1 20 1 50 N8481B 10 MHz to 2 GHz 2 GHz to 12 4 GHz 12 4 GHz to 18 GHz 1 09 1 14 1 23 1 10 1 18 1 28 N8482B 100 kHz to 2 GHz 2 GHz to 6 GHz 1 08 1 16 1 10 1 18 N8481H 10 MHz to 8 GHz 8 GHz to 12 4 GHz 12 4 GHz to 18 GHz 1 16 1 22 1 32 1 16 1 22 1 41 N8482H 100 kHz to ...

Page 44: ... Figure 2 2 Typical SWR 100 kHz to 6 GHz 25 C 10 C for N8482A power sensor Figure 2 3 Typical SWR 10 MHz to 26 5 GHz 25 C 10 C for N8485A power sensor 0 2 1 3 4 5 6 1 1 01 1 02 1 03 Frequency GHz SWR 1 04 Frequency GHz SWR 1 0 5 20 10 25 30 35 1 02 1 04 1 06 1 08 1 12 1 14 1 16 1 18 1 20 15 1 10 ...

Page 45: ...2 4 Typical SWR 50 MHz to 50 GHz 25 C 10 C for N8487A power sensor Figure 2 5 Typical SWR 10 MHz to 70 GHz 25 C 10 C for N8488A power sensor Frequency GHz SWR 1 0 10 20 40 50 60 1 02 1 04 1 06 1 08 1 12 1 14 1 16 1 18 1 20 30 1 10 Frequency GHz SWR 1 0 10 20 40 50 60 1 05 1 10 1 20 1 25 1 30 30 1 15 70 ...

Page 46: ...cal SWR 33 MHz to 50 GHz 25 C 10 C for N8486AQ power sensor Figure 2 7 Typical SWR 26 5 GHz to 40 GHz 25 C 10 C for N8486AR power sensor Frequency GHz SWR 33 36 39 45 48 51 1 06 1 11 1 16 1 21 1 26 1 31 1 36 1 41 42 Frequency GHz SWR 1 04 26 5 29 36 5 31 5 39 41 5 1 06 1 08 1 10 1 12 1 18 1 20 1 22 34 1 14 1 16 ...

Page 47: ...l SWR 10 MHz to 18 GHz 25 C 10 C for N8481B power sensor Figure 2 9 Typical SWR 100 kHz to 6 GHz 25 C 10 C for N8482B power sensor Frequency GHz SWR 1 0 2 8 4 10 12 14 1 01 1 02 1 03 1 04 1 06 1 07 1 08 6 1 05 16 18 6 20 Frequency GHz SWR 1 01 0 1 4 2 5 6 7 1 012 1 014 1 016 1 018 1 022 1 024 1 026 1 028 3 1 020 ...

Page 48: ...WR 10 MHz to 18 GHz 25 C 10 C for N8481H power sensor Figure 2 11 Typical SWR 100 kHz to 6 GHz 25 C 10 C for N8482H power sensor Frequency GHz SWR 0 2 8 4 10 12 14 6 16 18 20 1 1 02 1 04 1 06 1 08 1 20 1 22 1 24 1 18 1 16 1 14 1 12 1 10 Frequency GHz SWR 1 1 01 1 02 1 03 1 04 1 06 1 07 1 08 1 09 1 05 0 1 4 2 5 6 3 7 ...

Page 49: ...s linearity is negligible except for the power range specified in Table 2 4 Table 2 4 Power linearity Sensor Model Power Range Linearity 25 C 10 C Linearity 0 C to 55 C N8481A N8482A N8485A N8487A N8488A N8486AR N8486AQ 1 dBm to 15 dBm 0 52 0 80 15 dBm to 20 dBm 0 80 1 90 N8481B N8482B 29 dBm to 39 dBm 0 52 0 80 39 dBm to 44 dBm 1 66 2 75 N8481H N8482H 17 dBm to 30 dBm 0 77 1 05 30 dBm to 35 dBm 2...

Page 50: ...8481 2 5 7 8A and N8486AR AQ power linearity at 25 C after zero and calibration with associated measurement uncertainty N8481 2 5 7 8A and N8486AR AQ 1 dBm to 10 dBm 10 dBm to 15 dBm 15 dBm to 20 dBm Measurement Uncertainty 0 35 0 35 0 35 Input Power dBm Error 0 0 2 0 4 0 6 1 0 0 8 1 0 0 8 0 6 0 2 0 4 5 5 20 10 25 15 ...

Page 51: ...e Guide 33 Figure 2 13 Typical N8481 2B power linearity at 25 C after zero and calibration with associated measurement uncertainty N8481 2B 29 dBm to 40 dBm 40 dBm to 44 dBm Measurement Uncertainty 0 35 1 21 Input Power dBm Error 0 2 0 4 0 6 1 0 0 8 1 0 0 8 0 6 0 2 0 4 5 0 10 20 25 15 ...

Page 52: ...ce Guide Figure 2 14 Typical N8481 2H power linearity at 25 C after zero and calibration with associated measurement uncertainty N8481 2H 17 dBm to 30 dBm 30 dBm to 35 dBm Measurement Uncertainty 0 60 2 39 Input Power dBm Error 0 0 2 0 4 0 6 1 0 0 8 1 0 0 8 0 6 0 2 0 4 5 5 20 10 25 15 10 ...

Page 53: ...ignal level decreases below this power the lower range is selected N8481 2B power sensors This hysteresis causes the lower range to remain selected until approximately 29 5 dBm as the power level is increased above this power the upper range is selected The upper range remains selected until approximately 28 5 dBm as the signal level decreases below this power the lower range is selected N8481 2H ...

Page 54: ...ption CFT N A5 Up to 70 63 µW 7 µW 114 µW N8481H N8482H Standard Upper Up to 70 6 3 µW 0 7 µW 11 4 µW Lower Up to 70 2 5 µW 0 3 µW 8 µW Option CFT N A5 Up to 70 6 3 µW 0 7 µW 11 4 µW 1 RH is the abbreviation for relative humidity 2 Average hourly drift at constant temperature It is recommended to wait for 3 minutes and perform zeroing before taking the measurement For N8487A with serial number MY4...

Page 55: ...e 2 7 Settling time in normal and x2 mode Number of Averages 1 2 4 8 16 32 64 128 256 512 1024 Settling Time s Normal mode 0 15 0 2 0 3 0 5 1 1 1 9 3 4 6 6 13 27 57 Response Time s x2 mode 0 15 0 18 0 22 0 35 0 55 1 1 1 9 3 5 6 9 14 5 33 x2 Mode Maximum sensor power Sensor Dynamic Range 180 ms Minimum sensor power 400 ms 3 6 s 150 ms Typical Settling Times 10 dB 10 dB 10 dB 20 dB 6 6 s 5 dB Normal...

Page 56: ...efficient Rho or r relates to the SWR according to the following formula Typical measurement uncertainties of the Calibration Factor CF are listed in the following tables There is only one set of CF data used for both high and low range of each power sensors Therefore there is only one set of measurement uncertainty data available The typical measurement uncertainty data listed in this guide is me...

Page 57: ... 89 1 2 GHz to 6 GHz 0 91 1 58 1 06 0 89 1 56 1 02 6 GHz to 14 GHz 1 26 1 77 1 46 14 GHz to 18 GHz 1 59 1 92 1 73 Table 2 8 Calibration factor uncertainty at 25 ºC 3 ºC continued Frequency 25 ºC 3 ºC N8485A N8487A N8486AR N8486AQ 100 kHz to 10 MHz 10 MHz to 30 MHz 0 82 30 MHz to 500 MHz 1 24 1 33 500 MHz to 1 2 GHz 1 26 1 35 1 2 GHz to 6 GHz 1 35 1 41 6 GHz to 14 GHz 1 66 1 61 14 GHz to 18 GHz 1 8...

Page 58: ...92 18 GHz to 26 5 GHz 2 43 16 5 GHz to 50 GHz 4 56 50 GHz to 67 GHz 5 30 67 GHz to 70 GHz 5 81 Table 2 9 Calibration factor uncertainty at 25 ºC 10 ºC Frequency 25 ºC 10 ºC N8481A N8481B N8481H N8482A N8482B N8482H 100 kHz to 10 MHz 1 28 2 40 0 99 10 MHz to 30 MHz 1 47 1 98 1 39 1 03 1 84 0 86 30 MHz to 500 MHz 1 03 1 91 1 10 1 03 1 83 0 98 500 MHz to 1 2 GHz 0 97 1 91 1 15 1 08 1 94 1 00 1 2 GHz ...

Page 59: ...Hz 2 26 2 87 14 GHz to 18 GHz 2 47 3 14 18 GHz to 26 5 GHz 3 75 3 77 26 5 GHz to 33 GHz 4 79 4 17 3 48 33 GHz to 34 GHz 4 55 4 07 5 02 34 GHz to 35 GHz 4 55 4 07 4 99 35 GHz to 40 GHz 4 55 4 07 5 02 40 GHz to 45 GHz 5 40 5 17 45 GHz to 50 GHz 6 02 5 20 Table 2 9 Calibration factor uncertainty at 25 ºC 10 ºC continued Frequency 25 ºC 3 ºC N8488A 10 MHz to 50 MHz 2 83 50 MHz to 100 MHz 1 98 100 MHz ...

Page 60: ... GHz 2 04 2 85 1 96 1 99 3 91 1 40 6 GHz to 14 GHz 2 62 3 81 4 81 14 GHz to 18 GHz 3 27 4 30 9 74 Table 2 10 Calibration factor uncertainty at 0 ºC to 55 ºC continued Frequency 0 ºC to 55 ºC N8485A N8487A N8486AR N8486AQ 100 kHz to 10 MHz 10 MHz to 30 MHz 1 25 30 MHz to 500 MHz 1 98 2 14 500 MHz to 1 2 GHz 2 07 2 45 1 2 GHz to 6 GHz 2 40 2 65 6 GHz to 14 GHz 2 99 3 17 14 GHz to 18 GHz 3 35 3 41 18...

Page 61: ...cal cal factor and SWR vs frequency Table 2 10 Calibration factor uncertainty at 0 ºC to 55 ºC continued Frequency 25 ºC 3 ºC N8488A 10 MHz to 50 MHz 3 69 50 MHz to 100 MHz 2 63 100 MHz to 2 GHz 2 40 2 GHz to 12 4 GHz 2 61 12 4 GHz to 18 GHz 3 15 18 GHz to 26 5 GHz 4 50 16 5 GHz to 50 GHz 5 67 50 GHz to 67 GHz 7 18 67 GHz to 70 GHz 8 69 92 0 9 0 95 1 1 05 1 1 1 15 Typical CF Typical SWR Cal Factor...

Page 62: ...X 1 2 in X 4 75 in Net 0 154 kg 0 34 lb Shipping 0 874 kg 1 92 lb N8488A 38 mm W x 30 mm H x 115 mm L 1 5 in X 1 2 in X 4 5 in Net 0 162 kg 0 36 lb Shipping 0 881 kg 1 94 lb N8486AR 38 mm W x 62 mm H x 152 mm L 1 5 in X 2 4 in X 6 0 in Net 0 202 kg 0 45 lb Shipping 0 922 kg 2 03 lb N8486AQ 38 mm W x 62 mm H x 152 mm L 1 5 in X 2 4 in X 6 0 in Net 0 204 kg 0 45 lb Shipping 0 924 kg 2 03 lb N8481B N...

Page 63: ...Ratio SWR and Reflection Coefficient Rho Performance Test 48 Zero Set Performance Test 51 Replaceable Parts 53 Troubleshooting 59 Repair 59 Diassembly Reassembly Procedures 60 Diassembly Procedure 60 Reassembly Procedure 60 This chapter contains information about principle of operations troubleshooting and repair of the Keysight N8480 Series power sensors ...

Page 64: ... the connector will render the power sensor inoperative Clean the connector face by first using a blast of compressed air If the compressed air fails to remove contaminants use a cotton swab dipped in isopropyl or ethyl alcohol If the swab is too big use a round wooden toothpick wrapped in a lint free cloth dipped in isopropyl or ethyl alcohol CAUTION The RF connector bead deteriorates when contac...

Page 65: ...ing gate and an input amplifier The chopper circuit converts the DC voltages to AC voltages The chopper is controlled by a 440 Hz square wave generated by the power meter The amplitude of the sampling gate output is a 440 Hz square wave which varies with the RF power input The 440 Hz AC output is applied to an amplifier which provides the input to the power meter The Keysight EPM Series EPM P Seri...

Page 66: ...ion factor the power sensor should be compared with another recently calibrated power sensor The source should be leveled with a reference coupler that has low SWR and high directivity to monitor or level the incident power For calibration factor and error analysis refer to Keysight Application Note AN1449 1 to AN1449 4 Part 1 to Part 4 Fundamentals of RF and Microwave Power Measurement NOTE Waveg...

Page 67: ...013 0 105 N8482A 100 kHz to 300 kHz 0 007 0 212 300 kHz to 1 MHz 0 005 0 077 1 MHz to 2 GHz 0 008 0 030 2 GHz to 6 GHz 0 009 0 035 N8485A 10 MHz to 50 MHz 0 011 0 143 50 MHz to 100 MHz 0 006 0 038 100 MHz to 2 GHz 0 005 0 025 2 GHz to 12 4 GHz 0 009 0 064 12 4 GHz to 18 GHz 0 011 0 085 18 GHz to 26 5 GHz 0 014 0 114 26 5 GHz to 33 GHz 0 020 0 139 N8487A 50 MHz to 100 MHz 0 013 0 038 100 MHz to 2 G...

Page 68: ... 40 GHz 0 011 0 133 40 GHz to 67 GHz 0 022 0 190 67 GHz to 70 GHz 0 026 0 200 N8486AR 26 5 GHz to 40 GHz 0 021 0 168 N8486AQ 33 GHz to 50 GHz 0 054 0 200 N8481B 10 MHz to 2 GHz 0 007 0 042 2 GHz to 12 4 GHz 0 018 0 066 12 4 GHz to 18 GHz 0 023 0 102 N8482B 100 kHz to 2 GHz 0 011 0 041 2 GHz to 6 GHz 0 013 0 074 N8481H 10 MHz to 8 GHz 0 015 0 075 8 GHz to 12 4 GHz 0 021 0 099 12 4 GHz to 18 GHz 0 0...

Page 69: ... Libraries Suite installed System specification 25 nW tested at 50 MHz Recommended power meter N1913A N1914A Recommended 50 MHz 50 Ω load 85138B Procedure 1 Connect the DUT N8480 Series to the power meter N1913A as shown in the following diagram Then launch the Keysight IO Libraries Suite on the computer 2 Warm up the DUT for approximately an hour 3 Launch the Interactive IO on the Keysight IO Lib...

Page 70: ...482A N8482B N8482H N8485A N8487A N8486AR and N8486AQ 11 Perform zeroing for the DUT by sending CAL ZERO AUTO ONCE 12 Set the DUT to the single trigger mode by sending INIT CONT OFF 13 Read the noise level of the DUT by sending READ and then record the reading 14 Repeat step 13 for 10 times and then calculate the mean value of the readings 15 Compare the calculated mean value to the system specific...

Page 71: ...der a part quote the Keysight part number specify the quantity required and address the order to the nearest Keysight office NOTE If you are located within United States you are adviced to order directly from the Keysight Parts Center in Roseville California Ask your nearest Keysight office for ordering information and forms for the Direct Mail Order System Information such as toll free telephone ...

Page 72: ...3 Service 54 N8480 Series Power Sensors Operating and Service Guide Figure 3 1 Illustrated Parts Breakdown MP5 MP1 MP 4 MP2 MP6 MP4 MP1 MP3 A1 MP2 ...

Page 73: ... replacement module N8488A N8488A 100 N8488 60006 1 N8488A 1 85 mm replacement module N8481B N8181B 100 N8481 60012 1 N8481B Type N replacement module N8482B N8482B 100 N8482 60008 1 N8482B Type N replacement module N8481H N8481H 100 N8481 60014 1 N8481H Type N replacement module N8482H N8482H 100 N8482 60010 1 N8482H Type N replacement module N8486AR N8486AR 100 N8486 60010 1 N8486AR Waveguide fl...

Page 74: ...301 1 Label ID top N8488A MP3 N8486 84301 1 Label ID top N8486AR MP3 N8486 84302 1 Label ID top N8486AQ MP3 N8481 84302 1 Label ID top N8481B MP3 N8482 84302 1 Label ID top N8482B MP3 N8481 84303 1 Label ID top N8481H MP3 N8482 84303 1 Label ID top N8482H MP4 N8481 84304 2 Label Side MP5 N8481 84305 1 Label Cert bottom MP6 00346 80011 1 Label Information Table 3 2 Replaceable parts list for standa...

Page 75: ...B 100 N8481 60013 1 N8481B Type N replacement module CFT Option N8482B N8482B 100 N8482 60009 1 N8482B Type N replacement module CFT Option N8481H N8481H 100 N8481 60015 1 N8481H Type N replacement module CFT Option N8482H N8482H 100 N8482 60011 1 N8482H Type N replacement module CFT Option N8486AR N8486AR 100 N8486 60011 1 N8486AR Waveguide flange UG 599 U replacement module CFT Option N8486AQ N8...

Page 76: ...ID top N8481H MP3 N8482 84310 1 Label ID top N8482H MP4 N8481 84304 2 Label Side MP5 N8481 84306 1 Label ID Certification Bottom CFT Option MP6 00346 80011 1 Label Information Table 3 4 Replacement part list for adapters used on N8480 Series power sensors Model Part Number Quantity Description N8485A 08485 60005 1 3 5 mm to N m Coax Adapter N8487A 08487 60001 1 2 4 mm to N m Coax Adapter Table 3 3...

Page 77: ...ror message is displayed but a problem occurs when making a measurement try replacing the cable from the power meter to the power sensor If the problem still exists try using a different power sensor to determine if the problem is in the power meter or in the power sensor Electrostatic discharge will render the power sensor inoperative Do not under any circumstances open the power sensor unless yo...

Page 78: ... inoperative At the rear of the power sensor insert the blade of a screwdriver between the plastic shells See Figure 3 2 To prevent damage to the plastic shells use a screwdriver blade as wide as the slot between the two shells Pry alternately at both sides of the connector until the plastic shells are apart Remove the shells and the magnetic shields Figure 3 2 Removing power sensor shell Reassemb...

Page 79: ...20 547 2111 Japan tel 81 426 56 7832 fax 81 426 56 7840 Korea tel 080 769 0800 fax 080 769 0900 Latin America tel 305 269 7500 Taiwan tel 0800 047 866 fax 0800 286 331 Other Asia Pacific Countries tel 65 6375 8100 fax 65 6755 0042 Or visit Keysight World Wide Web at www keysight com find assist Product specifications and descriptions in this document are subject to change without notice Always ref...

Page 80: ...This information is subject to change without notice Keysight Technologies 2003 2015 Edition 12 June 26 2015 N8481 90000 N8481 90000 www keysight com ...

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