Agilent Technologies 1153A User And Service Manual Download Page 14 | Manualshive

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16

Operating the Probe

Introduction

This section of the manual contains information and instructions for:

• Using accessories

• Grounding the probe

• Probe coupling

• Discussion of common mode rejection ratio (CMRR) and differential amplifiers

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Summary of Contents for 1153A

Page 1: ...uide Publication number 01153 97004 July 2004 For Safety and Regulatory information see the pages after the index Copyright Agilent Technologies 1991 2004 All Rights Reserved Agilent Technologies 1153A Differential Probe ...

Page 2: ...ct Ac coupling The variable offset capability can be used to measure small ac signals in the presence of much larger dc levels The probe can be used with instruments employing the Agilent AutoProbe probe interface such as the Infiniium family of oscilloscopes Accessories Supplied The following accessories are supplied See Accessories supplied in chapter 1 for a complete list 10 1 attenuator adapte...

Page 3: ...g 21 Coupling functions 22 Differential amplifiers and CMRR 24 3 Service Introduction 26 Safety 26 Service Strategy 26 To return the probe to Agilent Technologies for service 27 Probe troubleshooting 28 Preparing the probe for troubleshooting 28 Troubleshooting the probe 28 Removing and replacing the assemblies 30 Differential Probe 30 Probe Adapters 32 Replaceable Parts 34 Ordering replacement pa...

Page 4: ...5 1 General Information ...

Page 5: ...6 General Information Introduction This chapter covers the following information Inspection Cleaning Accessories supplied Accessories available Specifications Characteristics General characteristics ...

Page 6: ...e instrument If there is mechanical damage or defect or if the instrument does not operate properly or pass calibration tests notify your Agilent Technologies Sales Office If the shipping container is damaged or the cushioning materials show signs of stress notify the carrier as well as your sales office Keep the shipping material for the carrier s inspection The Agilent Technologies office will a...

Page 7: ...m Item Description Qty Part Number 1 Differential Probe 1 2 10 1 Attenuator Adapter 1 5063 2144 3 100 1 Attenuator 1 5063 2145 4 ac Coupling Adapter 1 5063 2146 5 Two inch Extension Leads package 5 1 5959 9334 6 Mini Grabber 2 1400 1422 7 Five inch Ground Lead 1 5061 6162 8 Shielded Signal Lead 1 01141 68702 9 Test Board 1 01141 66504 10 Flat blade Alignment Tool 1 8710 1961 11 Circuit Connection ...

Page 8: ...9 General Information Accessories Supplied Figure 1 1 1153A Differential Probe and Accessories 4 2 3 1 5 6 7 8 ...

Page 9: ...re 1 2 1153A Miscellaneous Accessories Accessories Available The following accessories are available for use with the 1153A 5959 9335 Long Extension Lead 5 5 inch 14 cm package of 5 5090 4833 SMT clip package of 20 10467 68701 Micro Clip package of 4 ...

Page 10: ...ith IF reject or appropriate offset 18 Vdc decreasing to 300 mv at 30 Hz 180 Vdc decreasing to 3 0 V at 30 Hz 500 Vdc decreasing to 30 V at 30 Hz Common mode operating range dc 18 Vdc 180 Vdc 500 Vdc dc to 30 Hz linear decreased to 30 Hz value 30 Hz to 200 MHz 0 5 V peak 5 V peak 50 V peak dc offset range 18 V 180 V 500 V Input Impedance Resistance Capacitance 1 MΩ 7 pF 9 MΩ 3 5 pF 10 MΩ 2 pF ac c...

Page 11: ...ity at 65 C 149 F Altitude up to 4 600 meters 15 000 ft up to 15 300 meters 50 000 ft Vibration Random vibration 5 to 500 Hz 10 minutes per axis 0 3grms Random vibration 5 to 500 Hz 10 min per axis 2 41 grms Resonant search 5 to 500 Hz swept sine 1 octave min sweep rate 0 75g 5 min resonant dwell at 4 resonances per axis Power Requirements 12 Vdc 33 mA max 12 Vdc 16 mA max voltages supplied 6 Vdc ...

Page 12: ...13 General Information General Characteristics Figure 1 3 1153A Differential Probe Dimensions ...

Page 13: ...15 2 Operating the Probe ...

Page 14: ...e Probe Introduction This section of the manual contains information and instructions for Using accessories Grounding the probe Probe coupling Discussion of common mode rejection ratio CMRR and differential amplifiers ...

Page 15: ...be and accessories provide a variety of ways to connect to circuitry and make measurements In the descriptions any method used to connect to the probe signal inputs also applies to the adapters The figure below shows in a general way the use of accessories Figure 2 1 Basic Accessory Connections ...

Page 16: ...d input parameters To prevent pickup of stray fields when you use extension leads either the ones supplied with the 1153A or others dress them carefully as follows Connect the leads at right angles to the circuitry under test Keep the leads as parallel as possible before they connect to the probe Mini Clips Mini clips and micro clips can be attached to the probe or adapter through the extension le...

Page 17: ... other is an ac adapter for blocking dc from the probe input The adapters are installed on the probe after the probe tip caps and probe tips have been removed The adapter fastens to the probe using a thumbwheel located on the underside of the adapter The figure below shows a good way to hold the probe while attaching the adapter 1 Remove the probe tip caps and probe tips from the probe 2 Fit the a...

Page 18: ...enuator adapter and the probe An attenuator adapter must be terminated by the input resistance of the probe The ac adapter isolates the probe input resistance Do not cascade two attenuator adapters The attenuator adapters are designed to be terminated by the 1 MΩ resistance of the probe The input resistance of the attenuator adapters is 9 MΩ for the 10 1 adapter and 10 MΩ for the 100 1 adapter Fig...

Page 19: ...the adapters fasten accepts an M3 metric screw Test board The primary use of the test board is to apply test and calibration signals to the inputs of the probe or adapters Specific use of the test board is covered wherever it applies Grounding Grounding is very important when probing circuitry Improper grounding can increase the common mode signal level This reduces the effectiveness of the differ...

Page 20: ...c coupling adapter is used Thereisaselectablelowfrequencycorner with 3dBpointsat1 7Hz LFR1 or0 14Hz LFR2 The voltage reject range is 18 V with the probe alone 180 V with the 10 1 attenuator and 500 V with the 100 1 attenuator With the frequency and voltage characteristics noted elsewhere in this manual low frequencies are nulled from the input signal dc Offset If Reject ac Coupling Adapter dc Bloc...

Page 21: ...ct or offset methods The ac adapter blocks the dc and low frequency component of the input by forming a high pass filter with the input impedance of the probe or adapter The key characteristics are The ac adapter safely blocks 200 Vdc when attached directly to the probe or 500 Vdc when attached to a 10 1 or 100 1 adapter The probe and adapters have different input impedances so they have different...

Page 22: ...e symmetry of the differential input circuitry For example using different lengths of wire to connect the circuit to the two probe inputs unbalances the inductance and capacitance at the inputs The effective CMRR will be reduced especially at high frequencies Additionally coupling from adjacent circuitry will be less balanced The impedance of the source This is another instance where the symmetry ...

Page 23: ...25 3 Service ...

Page 24: ...e before servicing the instrument Before performing any procedure review it for cautions and warnings WAR N ING Maintenance should be performed by trained service personnel aware of the hazards involved for example fire and electric shock When maintenance can be performed without power applied the power cord must be removed from the instrument Service Strategy For repair and Calibration Tests retu...

Page 25: ... cables Do not include accessories unless they are associated with the failure symptoms 3 Protect the instrument by wrapping it in plastic or heavy paper 4 Pack the instrument in foam or other shock absorbing material and place it in a strong shipping container You can use the original shipping materials or order materials from an Agilent Technologies Sales Office If neither are available place 3 ...

Page 26: ...oward the cable end of the probe until the locator pins at the probe end of the bottom cover clear the holes Remove the cover Troubleshooting the probe 1 Connect the probe to the channel input of an Infinuum oscilloscope This will supply power to the probe amplifier and correctly terminate the probe output 2 Apply a known signal from a signal source to the coaxial connector on the test board using...

Page 27: ...he probe cable attaches to the probe pc board 8 If any of the signals observed in step 3 through 7 are incorrect check the power supply voltages from the Infiniium oscilloscope Refer to To check probe power outputs in the Troubleshooting chapter of the service guide for the Infiniium oscilloscope 9 If these power supply voltages from the Infiniium oscilloscope are correct repair the probe by repla...

Page 28: ...be clamp ring at the cable end of the probe 1 4 turn counter clockwise and slide it down the cable 3 Remove the bottom cover a At the cable end of the probe separate the covers about one centimeter 1 2 inch b Slide the bottom cover toward the cable end of the probe until the locator pins at the probe input clear the holes Then remove the cover Note the way the cable strain relief is keyed and held...

Page 29: ...obe cable the conductors of the coaxial cable are connected by a heavy single wire Cut the heavy wire so it matches the wire on the cable that was removed 5 Assemble the PC assembly into the top cover The large hybrid is exposed when the assembly is in the top cover The figure on the below shows the sequence of the ground screw top cover PC board and ground block a Insert the input connectors firs...

Page 30: ...housing consists of two plastic parts one of which slides into the other The parts are held together by the spring effect of two plastic tabs on the inner part Mechanically the ac adapter is about the same as the 10 1 and 100 1 attenuator adapters The attenuator adapters have an extra ground connector which connects the substrate ground to the thumbwheel screw and plating inside the housing Disass...

Page 31: ...adapters only over the thumbwheel screw and seat the input connectors in the proper holes in the housing Do not force reassembly of the adapter The housing halves will slide together with moderate friction 4 Align the inner housing tabs with the grooves in the side of the outer housing and slide the two partly together While seating the thumbwheel screw and pins it will help to hold the assembly v...

Page 32: ...quired Address the order to the nearest Agilent Technologies Sales Office Direct Mail Order System Within the USA Agilent Technologies can supply parts through a direct mail order system There are several advantages to this system Direct ordering and shipment from the Agilent Technologies parts center in California USA No maximum or minimum on any mail order there is a minimum amount for parts ord...

Page 33: ...eturned within the warranty time limit the customer will be charged an additional amount The additional amount will be the difference in price between a new assembly and that of an exchange assembly Replaceable parts The following tables list replaceable parts The first table is for replaceable parts at the assembly level and the second table is for replaceable parts for the adapters The informati...

Page 34: ...36 Service Replaceable Parts Figure 3 7 1153A Differential Probe Parts ...

Page 35: ...lastic Cap for Probe Pin MP2 01141 47702 1 Probe Bottom Cover MP3 01141 44102 1 Probe Top Cover MP4 01141 22502 1 Probe Pod Clamp Ring MP5 01153 94302 1 Differential Probe Label W1 01153 61602 1 Probe Cable Assembly Adapter Replaceable Parts Part Number Qty Description 10 1 Attenuator Adapter 01141 26102 2 Probing Pin 01141 24102 2 Cap probing Pin 100 1 Attenuator Adapter 01141 26102 2 Probing Pin...

Page 36: ...yed noise 11 E environmental 12 altitude 12 humidity 12 temperature 12 vibration 12 exchange assemblies 35 extension leads 18 F features 2 G general characteristics 12 ground lead 18 grounding 21 H humidity range 12 I input impedance 11 input voltage 11 inspecting 7 L lf reject 22 linear differential input range 11 M maximum input voltage 11 mini clips 18 N noise displayed 11 O offset 23 output te...

Page 37: ...hnology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend If software is for use in the performance of a U S Government prime contract or subcontract Softwareisdelivered and licensed as Commercial computer software as defined in DFAR252 227 7014 June1995...

Page 38: ...t make the instrument inoperative and secure it against any unintended operation Service instructions are for trained service personnel To avoid dangerous electric shock do not perform any service unless qualifiedto doso Donotattempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present Do not install substitute parts or perform any unauth...

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