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equipment:oscilloscopes [2019/02/22 08:09]
tggzzz [Specific Features]
equipment:oscilloscopes [2020/10/24 10:49]
tggzzz
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 ===== Oscilloscopes ===== ===== Oscilloscopes =====
-==== Overview ==== 
-Understand how to use them safely //before// using them. 
  
-This page summarises our scopes in terms of their target application domains, who might use them, and where they can be stored. The "details" section lists unique benefits. From this we can choose which scopes to cull, and to see what would be interesting in the future.  +Since the oscilloscope and probe become part of the circuit being testedit is also necessary to understand //and apply// the information on the [[equipment:oscilloscopeprobes|oscilloscope probes]] page. If in doubt (especially about safety), please ask before damaging scopes or people.
- +
-One way of categorising scopes is by how often we expect to use them, which translates into where they should be stored: +
-  * electronics test bench: small, robust, easy-to-use scopes for casual use and everyday tasks +
-  * accessible shelf over the electronics test bench: unique features necessary for specific tasksbut may be large or awkward +
-  * high shelf elsewhere in G11: unique but flawed, or duplicated capabilities, or used if several scopes are required simultaneously for workshops +
-  * we have disposed of some scopes, because they were poor quality or we had too many duplicates or they were slightly faulty. Details have been removed from this page, but can be found via the "Old revisions" link at the top of the page +
- +
-Another is by target application domain likely to be found in typical HackSpace projects. There is significant overlap between categories, and there are many other application domains. +
- +
-Oscilloscopes are useless on their own - they also need probes to connect to the circuit. //Probes are surprisingly fragile and significantly affect your measurements// - see the [[oscilloscopeprobes|Oscilloscope Probe]] page for more informationNote than //none// of the HackSpace probes are suitable for measuring mains voltages directly.+
  
 ====Safety==== ====Safety====
- 
 Oscilloscopes can be used dangerously, especially when connecting to anything connected to the mains voltages. **Getting it wrong can result in __loud__ noises followed by __deathly__ slience**.     Obviously **electrocution** is a potential danger, but incorrect connections can also **melt** scope probes, cause **fires**, as well as **destroying** the **scope** or **unit** being tested. You may be surprised how mains earths can and do cause those problems. Internally scopes contain >**8kV**, and they can retain the charge long after the scope is switched off. Oscilloscopes can be used dangerously, especially when connecting to anything connected to the mains voltages. **Getting it wrong can result in __loud__ noises followed by __deathly__ slience**.     Obviously **electrocution** is a potential danger, but incorrect connections can also **melt** scope probes, cause **fires**, as well as **destroying** the **scope** or **unit** being tested. You may be surprised how mains earths can and do cause those problems. Internally scopes contain >**8kV**, and they can retain the charge long after the scope is switched off.
  
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 (If you //really// think you need to "float a scope" see the picture in the footnote to understand the //necessary minimum//. **Then don't do it** :) ) (If you //really// think you need to "float a scope" see the picture in the footnote to understand the //necessary minimum//. **Then don't do it** :) )
  
 +**Do not use any of HackSpace's scope probes for measuring mains equipment and voltages**, and that includes inside SMPSs.
  
 +
 +==== General ====
 +Understand how to use them safely //before// using them.
 +
 +This page summarises our scopes in terms of their target application domains, who might use them, and where they can be stored. The "Specific Features" section lists unique benefits. From this we can choose which scopes to cull, and to see what would be interesting in the future. 
 +
 +One way of categorising scopes is by how often we expect to use them, which translates into where they should be stored:
 +  * electronics test bench: small, robust, easy-to-use scopes for casual use and everyday tasks
 +  * accessible shelf over the electronics test bench: unique features necessary for specific tasks, but may be large or awkward
 +  * high shelf elsewhere in G11: unique but flawed, or duplicated capabilities, or used if several scopes are required simultaneously for workshops
 +  * we have disposed of some scopes, because they were poor quality or we had too many duplicates or they were slightly faulty. Details have been removed from this page, but can be found via the "Old revisions" link at the top of the page
 +
 +Another is by target application domain likely to be found in typical HackSpace projects. There is significant overlap between categories, and there are many other application domains.
 +
 +Oscilloscopes are useless on their own - they also need probes to connect to the circuit. //Probes are surprisingly fragile and significantly affect your measurements// - **see the [[oscilloscopeprobes|Oscilloscope Probe]] page for more information**. Note than **//none// of the HackSpace probes are suitable for measuring mains voltages directly**.
  
  
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 ^::: |Equivalent to the Tek 2245, but softbutton menus slightly less suitable for casual use |Move "soft knobs" in both directions, including after autosetup |Only analogue storage scope, traditionally less convenient than digital storage | ^::: |Equivalent to the Tek 2245, but softbutton menus slightly less suitable for casual use |Move "soft knobs" in both directions, including after autosetup |Only analogue storage scope, traditionally less convenient than digital storage |
 ^::: |Small size/weight |Medium size/weight | **Extender cards and manuals** for maintenance | ^::: |Small size/weight |Medium size/weight | **Extender cards and manuals** for maintenance |
-^::: | |**OUT OF ACTION**. //Do NOT use//. An unknown person "floated" this scope by disconnecting the protective mains earth. Apart from being **lethally dangerous** [[http://bristol.hackspace.org.uk/wiki/doku.php?id=oscilloscopes#safety|as noted above]], it may have been damaged internally. It has been PAT tested, but must be disassembled and the PSU capacitors checked and/or replaced by a person skilled in that task. |Dual beams very rare |+^::: | |**OUT OF ACTION**. //Do NOT use//. An unknown person "floated" this scope by disconnecting the protective mains earth. Apart from being **lethally dangerous** [[oscilloscopes#safety|as noted above]], it may have been damaged internally. It has been PAT tested, but must be disassembled and the PSU capacitors checked and/or replaced by a person skilled in that task. |Dual beams very rare |
 ^USP |Fast, 4 channels |Fast, 4 channels, excellent triggering, standard controls | Sensitive, three channel, storage | ^USP |Fast, 4 channels |Fast, 4 channels, excellent triggering, standard controls | Sensitive, three channel, storage |
 ^   |{{ :oscilloscope:isotech-isr1014.jpg?direct&100 |}} |{{ :oscilloscope:tektronix2245.jpg?direct&100 |}}  |{{ :oscilloscope:telequipmentDM63.jpg?direct&100 |}} | ^   |{{ :oscilloscope:isotech-isr1014.jpg?direct&100 |}} |{{ :oscilloscope:tektronix2245.jpg?direct&100 |}}  |{{ :oscilloscope:telequipmentDM63.jpg?direct&100 |}} |
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 ^USP |Small, medium speed, easy |Sensitive, printing |  ^USP |Small, medium speed, easy |Sensitive, printing | 
 ^    |{{ :oscilloscope:topward-7042.jpg?direct&100 |}} | {{ :oscilloscope:metrotest-ox8020.jpg?direct&100 |}}| ^    |{{ :oscilloscope:topward-7042.jpg?direct&100 |}} | {{ :oscilloscope:metrotest-ox8020.jpg?direct&100 |}}|
- 
  
 === For Disposal === === For Disposal ===
-Since they were either faulty or a pain to use, and we had better scopes with these features, in February 2019 we disposed of these scopes: Wavetek 9020, Gould OS300, Tek TDS340, Schlumberger 5602.C, Hameg HM203. +Since they were either faulty or a pain to use, and we had better scopes with these features, in February 2019 we disposed of these scopes: Wavetek 9020, Gould OS300, Tek TDS340, Schlumberger 5602.C, Hameg HM203
 + 
 +To make more room and to reduce the equipment that needed to be moved to the new premises, in October 2020 we disposed of the Tektronix DM63 and the Topward 7042.
  
 If you want to see their features, look at an earlier revision of this page. If you want to see their features, look at an earlier revision of this page.
 +
 +==== Current Scope Location ====
 +
 +(this will be updated after the move)
 +
 +{{ :equipment:oscilloscopes_a.jpg?nolink |}}
 +{{ :equipment:oscilloscopes_b.jpg?nolink |}}
 +
 +
  
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  • equipment/oscilloscopes
  • Last modified: 12 months ago
  • by tggzzz