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Agilent Technologies 85024A, Руководство пользователя и сервисное руководство

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Agilent Technologies 85024A Скачать руководство пользователя страница 49

Chapter 7

 

7-3

Service

Theory of Operation

Theory of Operation

The probe uses a Gallium Arsenide FET integrated circuit amplifier which provides unity gain. This 
amplifier microcircuit re6 V and 

4 Vdc to operate. These voltages are provided by the regulator 

assembly.

The regulator assembly converts the +15 volt and 

12.6 volt supplies from the host instrument with two 

voltage regulators. The regulator supplies the +6 and 

4 voltages to the amplifier microcircuit.

The most common failures in the probe will all result in loss of signal through the probe, and will show 
up if the operator’s check is performed. The most common failures are expected to be:

1. Destruction of the amplifier microcircuit due to static electricity (proper anti-static precautions not 

taken).

2. Probe power tip damage (caused by the operator dropping the probe with the sleeve retracted).

3. Possible regulator failure.

ESD Protection at the Probe Tip

The FET integrated circuit amplifier is located at the tip of the probe. The FET input of the amplifier is 
protected by a bidirectional voltage limiter as shown in 

Figure 7-1

.

Figure 7-1 

Probe Tip Input Circuit

The voltage limiter element has a negligible effect on circuit operation for input voltages within 
specification. The voltage limiter is a non-linear element: it begins to conduct current at about 2.5 volts. 
It effectively limits voltages at the amplifier input to less than 



4 volts. This prevents amplifier damage 

from low levels of ESD.

Even with the protection provided by the voltage limiter element, the probe is still sensitive to ESD. 
High levels of ESD can cause permanent damage to the voltage limiter element itself. Careful ESD 
precautions must be observed when using the probe.

Содержание 85024A

Страница 1: ...and Service Guide Agilent Technologies 85024A High Frequency Probe Agilent Part Number 85024 90031 Printed in USA July 2013 Supersedes May 2012 Copyright 1989 2013 Agilent Technologies Inc All rights reserved ...

Страница 2: ... or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Exclusive ...

Страница 3: ...lt in damage to or destruction of the instrument Do not proceed beyond a caution note until the indicated conditions are fully understood and met WARNING Warning denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning note until the indicated conditions are fully understood and met NOTE...

Страница 4: ...iv ...

Страница 5: ...tification 3 2 Preparation for Use 3 3 Power Requirements 3 3 Mating Connectors 3 4 Returning the Product for Service 3 5 4 Operation Operating Precautions 4 2 Operating Instructions 4 3 Grounding the Probe 4 3 Retracting and Extending the Protective Sleeve 4 3 Operator s Check 4 4 Operator s check Using a Network Analyzer 4 4 Required Equipment 4 4 Operator s Check Using a Spectrum Analyzer 4 5 R...

Страница 6: ...ip Amplifier Microcircuit and Regulator Assembly 7 2 Main Cable and Plastic Sleeve Guide 7 2 Theory of Operation 7 3 ESD Protection at the Probe Tip 7 3 Troubleshooting Procedures 7 4 Mechanical Failure of the Protective Sleeve 7 4 Electrical Failure of the Probe 7 4 Visually Inspect the Probe Tip 7 4 Power Supply Check 7 4 Replacement Procedure 7 8 Replacing the Probe Tip 7 8 Replacing the Amplif...

Страница 7: ...1 1 1 General Information ...

Страница 8: ...0 V Maximum safe DC input voltage through a 10 1 divider 200 V Maximum safe RF voltage without 10 1 divider 1 5 V peak Maximum safe RF voltage through a 10 1 divider 15 V peak To minimize the potential for damage always begin measurements with the 10 1 divider attached Remove the 10 1 divider only when both of the following conditions are met RF and DC levels are known to within the above toleranc...

Страница 9: ... The probe microcircuit is susceptible to damage by static discharge Eliminate ESD on the body Wear a ground strap when using the probe Eliminate ESD on the work surface Use an anti static bench mat Never use the probe near a workbench that is covered by carpet Do not introduce ESD into the device under test DUT while the probe is in use If an unprotected person touches part of the DUT a static ch...

Страница 10: ... allows the testing of high frequency RF circuits High input impedance is maintained by a Gallium Arsenide GaAs field effect transistor FET microcircuit When not in use the probe tip is protected by a retractable grounded metal sleeve This helps prevent electrostatic discharge damage to the probe and protects the tip from breaking if the probe is dropped The probe tip may be inserted into the supp...

Страница 11: ...requency Response Flatness c c Relative to the Median Gain 300 kHz to 1 0 GHz 1 25 dB S 1 0 GHz to 3 0 GHz 2 5 dB S Average Noise Level 10 MHz Bandwidth 1 mV rms RTId or 47 dBm d Referred to Input N 3 GHz Bandwidth 17 mV rms RTId or 23 dBm S Noise Figure 100 MHz 50 dB N 100 MHz to 3 0 GHz 25 dB N Gain Compression at 0 3 V Peak Input Voltage 1 0 dB S Pulse Transition Time 200 ps N Distortion at 0 3...

Страница 12: ... feet Humidity Protect this product from temperature extremes which can cause internal condensation Indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use Forty years is the expected useful life of the product This symbol indicates separate collection for electrical and electronic equipment mandated under EU law as of A...

Страница 13: ...2 1 2 Accessories ...

Страница 14: ...2 2 Chapter2 Accessories Probe Features and Accessories Probe Features and Accessories Figure 2 1 Probe Features ...

Страница 15: ...ble 41800 61672 10 Slip on tip with grounding spike 5060 0549 11 Replacement tip short Replacement tip long 85024 60015 85024 60016 12 Hook tip adapter 10229A 13 Anti static protection cap 08405 40003 Table 2 2 Available Accessories Description Agilent Part or Model Number Type N Connector Gage Kit 85054B Adapter type N female to Precision 7 mma a Used with the 85046A S Parameter test set 11524A A...

Страница 16: ...ly used when performance testing the probe Operating Characteristics Inspection Periodically inspect the threads of the adapter for signs of wear and damage Inspect the barrel of the probe receptacle making sure it is clean and free of grit Clean the adapter threads or receptacle with clean compressed air Nominal Input Impedance 50 Frequency Range Same as the active probe 300 kHz to 3 GHz ...

Страница 17: ...s Operating Characteristics Inspection Make sure the tip is not bent or discolored Periodically inspect the barrel of the probe receptacle making sure it is clean and free of grit Clean the receptacle with clean compressed air When cascading 10 1 dividers periodically inspect and clean the exterior of the metal sleeve Divider Ratio 10 1 Input Capacitance Typically 0 7 pF Input Resistance 1 M Input...

Страница 18: ...of 10 1 Divider Replacing the Probe Tip 1 Remove the 10 1 divider from the probe 2 Unscrew the damaged tip with a 3 32 nut driver supplied with the probe and discard the tip 3 Screw on the new tip and lightly tighten it with a 3 32 inch nut driver Overtightening the tip can damage the nose assembly Item Description Part Number 1 Short probe tip 85024 60015 Long probe tip 85024 60016 2 Guide 11881 ...

Страница 19: ...3 1 3 Installation ...

Страница 20: ... defect Notify the carrier if the shipping container is damaged or if the cushioning material shows signs of stress Keep all shipping materials for the carrier s inspection Agilent Technologies will arrange for repair or replacement without waiting for a claim settlement Certification Agilent Technologies certifies that this product met its published specifications at the time of shipment from the...

Страница 21: ...e sleeve when not actually taking measurements Wear an anti static wrist strap and avoid introducing static electricity into the device under test DUT or test setup Make sure the device under test DUT is at the same ground potential as the probe Power Requirements If using the probe with an instrument that does not supply probe power you can purchase an 85024A 001 adapter cable assembly and one of...

Страница 22: ...s Mating Connectors CAUTION Periodically inspect and if necessary clean the type N output connector Refer to Chapter 7 Connector Inspection and Cleaning on page 15 The probe adapter should be inspected at the same time and cleaned if necessary ...

Страница 23: ...ost office box Provide the name and phone number of a contact person within your organization the complete model and serial number of the product and a complete description of the problem When shipping the probe for any reason be sure to use the original or comparable packaging materials Also mark the container FRAGILE to assure careful handling of the device When making inquiries either by corres...

Страница 24: ...3 6 Chapter3 Installation Returning the Product for Service ...

Страница 25: ...4 1 4 Operation ...

Страница 26: ...ollowing precautions Never touch the tip of the probe Always hold the probe by the retracted metal sleeve Work at a workstation equipped with an anti static mat Extend the protective sleeve when not actually taking measurements Wear an anti static wrist strap and avoid introducing static electricity into the device under test DUT or test setup Make sure the device under test DUT is at the same gro...

Страница 27: ...supplied with two grounding devices an alligator type ground clip and a slip on type ground tip Use the shortest ground path possible Proper grounding becomes more important as frequency increases For optimum measurements in a factory environment design your circuits with ground plane feedthroughs next to every test point Retracting and Extending the Protective Sleeve Hold the probe wand in one ha...

Страница 28: ...ut performing the analyzer operations used in this procedure 1 Preset the analyzer using the hardkey 2 Configure the analyzer to measure transmission 3 Set the output power level of the analyzer to 0 dBm 4 Set the frequency sweep range on the analyzer from 300 kHz to 3 GHz 5 Connect a type N cable a through cable between the output and the input ports on the analyzer 6 Perform a response calibrati...

Страница 29: ...er 4 Place the marker on the peak of the displayed signal and note the value in dBm 5 Connect the probe adapter to the calibration output 6 Connect the probe output to the RF input on the analyzer 7 Connect the probe power cable to a power source 8 Plug the probe tip into the probe adaptor 9 Place the marker on the peak of the displayed signal and compare the signal level in dBm to that measured i...

Страница 30: ...4 6 Chapter4 Operation Operator s Check ...

Страница 31: ...5 1 5 Performance Tests ...

Страница 32: ... the probe Follow the procedures record data on the Test Record on page 5 9 perform the calculations and determine pass or fail for each test item All tests must pass for the performance test to be verified NOTE The performance tests in this chapter cover the specifications for a standard 85024A probe If the serial number label indicates an option contact Agilent Technologies for applicable specif...

Страница 33: ...er Vector Network Analyzer 300 kHz to 3 GHz 8714ET ES 8753ET ES 8753Ea a Many models of network analyzers can be used for these performance tests The network analyzer must cover the frequency range 300 kHz to 3 GHz and be capable of power output in the range of 3 to 5 dBm Power Meter 437B 438A or E4418A E4419A Power Sensor 300 kHz to 3 GHz 30 dBm to 5 dBm 8482A Type N Cable male to male 50 8120 88...

Страница 34: ...ress then and set the Trigger mode to To return to normal operation set the trigger mode to and define start and stop frequencies 8753 family Press or to access both the sweep and trigger functions The softkey activates CW mode press then To return to normal operation change the trigger mode to or then followed by 871x family Press 8753 family Press or to access 871xC and 871xET Press then Press w...

Страница 35: ... analyzer Connect the type N barrel to the free end of the cable 7 Connect the probe adapter to the output port of the analyzer Connect the probe between the probe adapter and the type N barrel Plug the probe power cable into the front panel of the analyzer 8 Read the following four values from the trace on the analyzer and enter the values on the Test Record on page 5 9 Use the network analyzer m...

Страница 36: ...onnect the probe power cable to a power source 9 Perform a response calibration on the analyzer using the probe as the through cable The trace on the analyzer should now be a flat line at 0 dB 10 Insert the attenuator between the output port of the analyzer and the probe adapter Reconnect the probe to the probe adapter 11 Determine the frequency of peak gain on the trace of the analyzer Record the...

Страница 37: ...cord to determine the result of the test Calculating Equivalent Power The probe is usually used as a high impedance device The compression specification is given as a voltage instead of power because of the wide range of devices with which the probe may be used For testing the probe the probe adapter is used to make the probe input 50 Using this known impedance an equivalent power can be calculate...

Страница 38: ...he power meter 3 Enable averaging on the power meter 4 Connect the power cable on the RF probe to a power source allow the probe to warm up for at least three minutes 5 Connect the probe tip adapter to the tip of the probe This effectively grounds the probe tip 6 Connect the RF probe to the power sensor using a type N barrel 7 Read the power meter If the reading is unstable visually determine the ...

Страница 39: ...z to 1 GHz dB N A N A N A B Minimum gain over 300 kHz to 1 GHz dB N A N A N A C Maximum gain over 1 GHz to 3 GHz dB N A N A N A D Minimum gain over 1 GHz to 3 GHz dB N A N A N A E Median Gain A B 2 dB 1 25 1 25 LF maximum gain A E dB 1 25 0 LF minimum gain B dB 0 1 25 HF maximum gain C E dB 2 5 2 5 HF minimum gain D dB 2 5 2 5 Gain Compression Frequency at maximum gain N A N A N A F Pad before pro...

Страница 40: ...5 10 Chapter5 Performance Tests Average Noise Level ...

Страница 41: ...6 1 6 Replaceable Parts ...

Страница 42: ...n only once at the first appearance of the part in the list To order a part listed in the replaceable parts list indicate the Agilent part number and the quantity desired Address the order to the nearest Agilent Technologies office To order a part that is not listed in the replaceable parts list include the probe model and serial number the description and function of the part and the quantity des...

Страница 43: ...abel 85024 80003 1 Product Case 85024 80004 1 Bottom Foam of the Product Case 5180 8448 1 Top Foam of the Product Case 41800 61672 1 Ground Lead Flexiblea 5060 0549 1 Ground Tip Slip On with Grounding Spikea 10229A 1 Hook Tip Adaptera 8710 1806 1 3 32 inch Probe Tip Nut Drivera 11880 60001 1 Type N Probe Adaptera 11881 60001 1 10 1 Dividera Service Tool 85024 20041 Spanner Wrench see Figure 7 10 G...

Страница 44: ...embled 9 0515 0659 2 Screw Machined M2 8 mm LG Pan Head 10 0515 0658 2 Screw Machined M2 6 mm LG Pan Head 11 85024 20015 1 Probe Nut 12 85024 60015 1 Short Power Tip also used on 10 1 Divider 85024 60016 1 Long Power Tip 13 85024 60011 1 Nose Assembly 14 85024 40007 1 Conductive Washer 15 85024 60005 1 Amplifier Microcircuit 16 85024 20037 1 Clip Spring for Elastic Conductive Strip 17 85024 20035 ...

Страница 45: ...e Parts Identification CAUTION Failure to remove the nose assembly prior to replacing the tip will result in damage to the conductive elastometer on the tip assembly NOTE Item 11 is a nut which slides over items 12 through 17 and screws onto the end of the heat sink ...

Страница 46: ...6 6 Chapter6 Replaceable Parts Parts Lists ...

Страница 47: ...7 1 7 Service ...

Страница 48: ... and amplifier microcircuit are easily replaced The regulator assembly A1 repair can be performed at either assembly or component level Module exchange programs are not available for this product Main Cable and Plastic Sleeve Guide The main cable includes the probe wand the main cable and the smaller power supply cable If the cable is damaged both the cable and the probe wand assembly must be repl...

Страница 49: ... not taken 2 Probe power tip damage caused by the operator dropping the probe with the sleeve retracted 3 Possible regulator failure ESD Protection at the Probe Tip The FET integrated circuit amplifier is located at the tip of the probe The FET input of the amplifier is protected by a bidirectional voltage limiter as shown in Figure 7 1 Figure 7 1 Probe Tip Input Circuit The voltage limiter elemen...

Страница 50: ...ip on page 7 8 Perform the Operator s Check on page 4 4 If the problem persists perform the following procedure Power Supply Check Refer to the probe schematic in Figure 7 2 on page 7 5 when performing the following procedure 1 Check the probe power output from the supplying instrument or power supply The output pins and voltages are shown in Figure 7 4 on page 7 6 Check continuity of the ground p...

Страница 51: ...Chapter 7 7 5 Service Troubleshooting Procedures Figure 7 2 A1 Regulator Schematic Diagram and Overall Block Diagram Figure 7 3 High Frequency Probe ...

Страница 52: ...0 and continue with the following steps 6 Refer to Figure 7 4 Disconnect the power supply cable and check the continuity of the three input lines to the A1 regulator assembly If one of the wires is broken internally replace the cable probe wand assembly 7 If the three input lines show continuity desolder the 4 V and 6 V output wires shown in Figure 7 4 Measure the 6 V and 4 V feed throughs on the ...

Страница 53: ...Chapter 7 7 7 Service Troubleshooting Procedures Figure 7 5 A1 Regulator Assembly 85024 630711 1 Components on the regulator board are nonpurchasable items ...

Страница 54: ...ving the microcircuit attached to the body of the probe CAUTION Failure to remove the nose assembly prior to replacing the probe tip will result in damage to the conductive elastomer on the new probe tip assembly 3 Unscrew the damaged tip with the nut driver and discard the tip 4 Screw in the new tip and lightly tighten it with a 3 32 inch nut driver Overtightening the tip can damage the nose asse...

Страница 55: ...tic strip is flush with the front end of the heatsink The screwdriver may be used to move the strip 5 Place the new spring clip over the elastic strip flush with the front of the heatsink The beveled end of the clip should face away from the amplifier microcircuit The center of this U shaped clip must press into the elastic conductor Insert one side of the clip into the small slot in the probe hea...

Страница 56: ...embly by one end and insert the head of a 1 8 inch wide flatblade screwdriver into the seam at the other end The seam separates the two halves of the housing cover Twist the screwdriver 90 2 Perform step 1 in several places along the four pry points shown in Figure 7 8 Reassembling the Covers 3 Replace the metal housing reinforcement and plastic covers as show in Figure 6 1 on page 6 5 The reinfor...

Страница 57: ...bly If it does remove it from the old center conductor assembly and place it on the new one If it is not attached to the center conductor assembly it remained inside the inner connector proceed to step 3 3 Hold the new center conductor assembly by the large round insulator not by the gold plated center conductor Carefully align the new center conductor and insert it into the inner connector Press ...

Страница 58: ... in a static safe place It will be needed later in this procedure 4 Remove the regulator housing covers by performing the procedure in Removing the Plastic Regulator Housing Covers on page 7 10 Refer to Figure 7 9 5 Remove the connector body with the 9 16 inch wrench Refer to Figure 7 11 6 Remove the four screws which hold in the regulator assembly Desolder the colored wires attached to the regula...

Страница 59: ... to Figure 7 7 18 On the new probe wand place the amplifier microcircuit into the heatsink assembly Place the elastic conductive strip in place making sure the gold traces are facing down and are aligned lengthwise with respect to the probe Make sure the elastic conductor is flush with the front of the heatsink The screwdriver may be used to align the strip 19 Place the spring clip over the conduc...

Страница 60: ...7 14 Chapter7 Service Replacement Procedure Figure 7 11 Regulator Parts and Wiring ...

Страница 61: ...as deformed threads contamination or corrosion concentrating especially on the contacting surfaces Look for burrs scratches rounded shoulders and similar signs of wear and damage Any problem you can see is sufficient to cause degraded performance Cleaning Connectors CAUTION Always wear an anti static wrist strap and work on an anti static bench mat when cleaning the probe s outer connectors Cleani...

Страница 62: ...r or nitrogen WARNING Isopropyl alcohol is extremely flammable causes irritation may cause eye damage and is harmful if swallowed or inhaled It may be harmful if absorbed through the skin Keep away from heat sparks and flame Avoid contact with eyes skin clothing Avoid breathing vapor Keep in tightly closed container Use with adequate ventilation Wash thoroughly after handling In case of fire use a...

Страница 63: ...ngland 44 118 9696622 INTERCON FIELD OPERATIONS Headquarters Agilent Technologies 3495 Deer Creek Rd Palo Alto CA 94304 1316 USA 415 857 5027 Japan Agilent Technologies Japan Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 8510 Japan TEL 81 426 56 7832 FAX 81 426 56 7840 Australia Agilent Technologies Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 61 3 895 2895...

Страница 64: ...7 18 Chapter7 Service Connector Inspection and Cleaning ...

Страница 65: ...s 3 4 measurement precautions 1 2 measurements 5 4 mechanical failure of the protective sleeve 7 4 median gain 5 5 N network analyzer operation 5 4 operator s check 4 4 noise level average 5 8 O operating characteristics 10 to 1 divider 2 5 high frequency probe 1 5 probe adapter 2 4 operating instructions 4 3 discharging the probe 4 3 extending the protective sleeve 4 3 grounding the probe 4 3 ret...

Страница 66: ... 5 4 specifications product performance 1 5 spectrum analyzers operator s check 4 5 supplemental characteristics 1 5 T test equipment 5 3 test procedure average noise level 5 8 gain at 500 MHz frequency response flatness 5 5 input voltage for 1 dB compression 5 6 median gain 5 5 operator s check using a network analyzer 4 4 operator s check using a spectrum analyzer 4 5 test record 5 9 tests perfo...

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