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ABCs of Probes
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Tektronix Probe Selector
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Tektronix Resources
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importance. Be sure that you understand the capabilities and limitations of the measuring equipment that you’re using. Also, before making any measurements, become thoroughly familiar with thesystem or circuitry that you will be measuring. Review all documentation and schematics for the system being measured, paying particular attention to the levels and locations of voltages in the circuit and heeding any and all cautionary notations. Additionally, be sure to review the following safety precautions to avoid personal injury and to prevent damage to the measuring equipment or the systemsto which it is attached. For additional explanation of any of the following precautions, please refer to Explanation of Safety Precautions. Observe All Terminal Ratings Use Proper Grounding Procedures

Safety Summary
When making measurements on electrical or electronic systems or circuitry, personal safety is of paramount

Connect and Disconnect Probes Properly Avoid Exposed Circuitry Avoid RFBurns While Handling Probes Do Not Operate Without Covers Do Not Operate in Wet/Damp Conditions Do Not Operate in an Explosive Atmosphere Do Not Operate with Suspected Failures Keep Probe Surfaces Clean and Dry Do Not Immerse Probes in Liquids

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ABCs of Probes

Table of Contents
Probes - The Critical Link to Measurement Quality . . . . . . . . . . . . .. . . . . . . . 4 - 13
What is a Probe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 The Ideal Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 The Realities of Probes . . . . . . . . . . . . . . . . . . . . . . . . . 7 Some Probing Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 13

Advanced Probing Techniques . . . . . . . . . . . . . 46 - 54
Ground Lead Issues . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Differential Measurements . . . . . . . . . . . . . . . . . . . . . . 50 Small Signal Measurements . . . . . . . . . . . . . . . . . . . . 53

Explanation of Safety Precautions . . . . . . . . . . 55 - 56
Observe All Terminal Ratings . . . .. . . . . . . . . . . . . . . . Use Proper Grounding Procedures . . . . . . . . . . . . . . . . Connect and Disconnect . . . . . . . . . . . . . . . . . . . . . . . Avoid Exposed Circuitry . . . . . . . . . . . . . . . . . . . . . . . . Avoid RF Burns While Handing Probes . . . . . . . . . . . . Do Not Operate Without Covers . . . . . . . . . . . . . . . . . Do Not Operate in Wet/Damp Conditions .. . . . . . . . . Do Not Operate in an Explosive Atmosphere . . . . . . . . Do Not Operate with Suspected Failures . . . . . . . . . . Keep Probe Surfaces Clean and Dry . . . . . . . . . . . . . . Do Not Immerse Probes in Liquids . . . . . . . . . . . . . . . 55 55 55 56 56 56 56 56 56 56 56

Different Probes for Different Needs . . . . . . . . . 14 - 25
Why So Many Probes? . . . . . . . . . .. . . . . . . . . . . . . . Different Probe Types and Their Benefits . . . . . . . . . . . Floating Measurements . . . . . . . . . . . . . . . . . . . . . . . . Probe Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 16 22 24

A Guide to Probe Selection . . . . . . . . . . . . . . . . 26 - 31
Choosing the Right Probe . . . . . . . . . . . . . . . . . . . . . . 26...