Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
equipment:oscilloscopeprobes [2017/02/02 18:25]
tggzzz
equipment:oscilloscopeprobes [2020/05/30 11:13] (current)
tggzzz
Line 1: Line 1:
-==== Oscilloscope Probes ====+===== Oscilloscope Probes ====
 +Probes must be used with oscilloscopes, so it is necessary to understand //and apply// the information on the [[equipment:oscilloscopes|oscilloscopes]] page. If in doubt (particularly about safety), please ask before damaging equipment or people.
  
-//**Safety**: do not use any scope probe for measuring mains equipment and voltages. Carefully read and understand the safety references in the "Praxis" section of [[https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/|Scope Probe Reference Material]] and [[http://www.tek.com/document/primer/abcs-probes|Tektronix' ABCs of Probes Primer]] pp55-56 - they might save someone's life//+==== Safety ==== 
 +**Do not use any of HackSpace'scope probes for measuring mains equipment and voltages**, and that includes inside SMPSs
  
-There are many types of scope probe, including *1, *10 "high" impedance, *10 "low" impedance Z0 resistive divider, current, EHV, envelope, active, differential, isolated. Each has advantages and disadvantages, and some are essential in some situations. Hackspace only has the common-or-garden *1 and *10 "high" impedance probes, but it may be possible to borrow others from members.+Carefully read and understand the safety references in the "Praxis" section of [[https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/|Scope Probe Reference Material]] and [[http://www.tek.com/document/primer/abcs-probes|Tektronix' ABCs of Probes Primer]] pp55-56 - //they might save someone's life// 
 + 
 +==== Types of Probe ==== 
 +There are many types of scope probe, including *1, *10 "high" impedance, *10 "low" impedance Z0 resistive divider, current, EHV, envelope, active, differential, isolated. Each has advantages and disadvantages, and **some are essential in some situations**See [[https://download.tek.com/document/60W_14232_9_MR_Letter.pdf|Tektronix' Probes and Accessories, Your Guide to Selecting the Right Probe]] 
 + 
 +Hackspace only has the common-or-garden *1 and *10 "high" impedance probes, but it may be possible to borrow others from members.
  
 Clearly scope probes are much //much// more than "bits of wire". They are surprisingly sophisticated pieces of technology containing very thin wires and precision components: Clearly scope probes are much //much// more than "bits of wire". They are surprisingly sophisticated pieces of technology containing very thin wires and precision components:
Line 14: Line 21:
     * **don't lose the accessories** such as "witches' hat" grabbers, ground springs, insulating tips - they are vital to the correct and safe operation of the probe. //Place accessories in the marked bag underneath the scope probe rack//     * **don't lose the accessories** such as "witches' hat" grabbers, ground springs, insulating tips - they are vital to the correct and safe operation of the probe. //Place accessories in the marked bag underneath the scope probe rack//
   * **vital**: your measurements will only be as good as your scope probes //and// the accessories   * **vital**: your measurements will only be as good as your scope probes //and// the accessories
 +
 +==== Usage ====
  
 Basic hints and tips: Basic hints and tips:
Line 29: Line 38:
  
 For more pointers about safety, choosing and using probes, plus when and how to make your own probes, see [[https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/|Scope Probe Reference Material]]. For more pointers about safety, choosing and using probes, plus when and how to make your own probes, see [[https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/|Scope Probe Reference Material]].
 +
 +There are some unused probes in plastic bags on or near the scopes. //Those should **not be used** routinely.// Why? See the warnings below about probes' fragility and ease of damage - and how expensive they are to replace. Instead **use the probes hanging on the equipment rack**. If it is necessary to use one of the probes in the plastic bags, please //put a message on the mailing list// noting why it was necessary. That will enable people to ensure we have the right equipment when members need it.
 +
 +Note: a scope without a working probe is as useful a bandsaw without a band: i.e. it is junk!
 +
 +{{ :equipment:oscilloscope_probes.jpg?nolink |}}
 +
 +
 +==== Probes with Scopes ====
  
 The following table shows the // approximate// frequency domain and time domain performance of [[oscilloscopes|scope]]/probe combinations, with examples of HackSpace equipment. The following table shows the // approximate// frequency domain and time domain performance of [[oscilloscopes|scope]]/probe combinations, with examples of HackSpace equipment.
  
-| ^  Scope Bandwidth  ||||||| ^ Examples  ^+| ^  Scope Bandwidth  ||||||| ^ Example Probe  ^
 ^ Probe Bandwidth  ^ 20MHz  ^ 40MHz  ^ 60MHz  ^ 100MHz  ^ 250MHz  ^ 500MHz  ^ 1000MHz  | ::: | ::: ^ ^ Probe Bandwidth  ^ 20MHz  ^ 40MHz  ^ 60MHz  ^ 100MHz  ^ 250MHz  ^ 500MHz  ^ 1000MHz  | ::: | ::: ^
 ^ 20MHz | 14MHz 24.7ns  | 18MHz 19.6ns  | 19MHz 18.4ns  | 20MHz 17.8ns  | 20MHz 17.6ns  | 20MHz 17.5ns  | 20MHz 17.5ns  ^ | T5020 | ^ 20MHz | 14MHz 24.7ns  | 18MHz 19.6ns  | 19MHz 18.4ns  | 20MHz 17.8ns  | 20MHz 17.6ns  | 20MHz 17.5ns  | 20MHz 17.5ns  ^ | T5020 |
Line 43: Line 61:
 ^ 1500MHz  | 20MHz 17.5ns  | 40MHz 8.8ns  | 60MHz 5.8ns  | 100MHz 3.5ns  | 247MHz 1.4ns  | 474MHz 0.7ns  | 832MHz 0.4ns  ^ | HP10020A | ^ 1500MHz  | 20MHz 17.5ns  | 40MHz 8.8ns  | 60MHz 5.8ns  | 100MHz 3.5ns  | 247MHz 1.4ns  | 474MHz 0.7ns  | 832MHz 0.4ns  ^ | HP10020A |
 | ^ ^ ^ ^ ^ ^ ^ ^ | |  | ^ ^ ^ ^ ^ ^ ^ ^ | | 
-Examples   Kenwood cs4125  |  Topward 7042  |  Agilent 54621  |  Schlumberger 5602  |  |    |    | |  | +Example Scope   Kenwood cs4125  |  Topward 7042  |  Agilent 54621  |  Schlumberger 5602  |  |    |    | |  |
 ^ ::: | Hameg hm203  | ::: |  Tek 2213  |  Tek tds340  | ::: | ::: | ::: | ::: | ::: | ^ ::: | Hameg hm203  | ::: |  Tek 2213  |  Tek tds340  | ::: | ::: | ::: | ::: | ::: |
 ^ ::: | Metrotest ox2030| ::: | ::: | ::: | ::: | ::: | ::: | ::: | ::: | ^ ::: | Metrotest ox2030| ::: | ::: | ::: | ::: | ::: | ::: | ::: | ::: |
  • equipment/oscilloscopeprobes.1486059949
  • Last modified: 4 years ago
  • by tggzzz