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equipment:oscilloscopes [2019/05/14 23:35]
tggzzz
equipment:oscilloscopes [2020/10/24 11:16]
tggzzz
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 ===== Oscilloscopes ===== ===== Oscilloscopes =====
  
-Since the oscilloscope and probe become part of the circuit being tested, it is also necessary to understand //and apply// the information on the [[equipment:oscilloscopeprobes|oscilloscope probes]] page. If unsure (especially about safety), please ask.+Since the oscilloscope and probe become part of the circuit being tested, it 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**.
  
 ====Safety==== ====Safety====
- +**Oscilloscopes can be used dangerously**, especially when connecting to anything connected to the mains voltages, and it is easy for a beginner to make a subtle mistake. **Getting it wrong can result in __loud__ noises followed by __deathly__ slience**.  
-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.+  * 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.
  
 Read and understand the references in the 'Formal' and 'Praxis' sections of [[https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/|this page]], and [[http://www.tek.com/document/primer/abcs-probes|Tektronix' ABCs of Probes Primer]] pp55-56 - and apply the knowledge //before// you make a connection.  Read and understand the references in the 'Formal' and 'Praxis' sections of [[https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/|this page]], and [[http://www.tek.com/document/primer/abcs-probes|Tektronix' ABCs of Probes Primer]] pp55-56 - and apply the knowledge //before// you make a connection. 
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 **Do not, under any circumstances whatsoever, disconnect an earth**; the results can kill you or - worse - can kill someone else. Use the proper type of probe!  **Do not, under any circumstances whatsoever, disconnect an earth**; the results can kill you or - worse - can kill someone else. Use the proper type of probe! 
 (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.
  
  
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 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.  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:+One way of categorising scopes is by how often we expect to use them, which translates into where they should be stored //(this will be updated after the move)//:
   * electronics test bench: small, robust, easy-to-use scopes for casual use and everyday tasks   * 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   * accessible shelf over the electronics test bench: unique features necessary for specific tasks, but may be large or awkward
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 | ^Test Bench ^Accessible Shelf ^High Shelf ^Dispose ^Typical spec and examples ^ | ^Test Bench ^Accessible Shelf ^High Shelf ^Dispose ^Typical spec and examples ^
-^Audio |Kenwood CS4125 |Telequipment DM63 |Metrotest OX8020 | |<100kHz, mV - audio signals, sensors | +^Audio |Kenwood CS4125 | |Metrotest OX8020 | |<100kHz, mV - audio signals, sensors | 
-^Mechatronics |Kenwood CS4125 |Telequipment DM63 |Metrotest OX8020 | |<10MHz, 50mV-50V, - motors, actuators, machines | +^Mechatronics |Kenwood CS4125 | |Metrotest OX8020 | |<10MHz, 50mV-50V, - motors, actuators, machines | 
-^::: |Agilent 54621 | |Topward 7042 | |::: | +^::: |Agilent 54621 | | | |::: | 
-^Digital |Agilent 54621 |Telequipment DM63 |Topward 7042  | |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino |+^Digital |Agilent 54621 |IsoTech ISR-1014 |  | |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino |
 ^::: | |Tektronix 2245 | | |::: | ^::: | |Tektronix 2245 | | |::: |
-^::: | |IsoTech ISR-1014 | | |::: | 
 ^Signal Integrity | |Tektronix 2245 | | |>=100MHz, 500mV-5V, medium-speed logic and checking valid logic levels, e.g. generic TTL, CMOS| ^Signal Integrity | |Tektronix 2245 | | |>=100MHz, 500mV-5V, medium-speed logic and checking valid logic levels, e.g. generic TTL, CMOS|
 ^::: | |IsoTech ISR-1014 | | |::: | ^::: | |IsoTech ISR-1014 | | |::: |
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 === Location: Accessible Shelf Above Test Bench=== === Location: Accessible Shelf Above Test Bench===
-| ^IsoTech ISR-1014 ^Tektronix 2245 ^Telequipment DM63 +| ^IsoTech ISR-1014 ^Tektronix 2245 ^ 
-^Location |Test bench shelf|Test bench shelf, to reduce chance of accidental damage  | Test bench shelf +^Location |Test bench shelf|Test bench shelf, to reduce chance of accidental damage 
-^Domain |Medium speed digital, signal integrity |Medium speed digital, signal integrity |Sensitive audio, mechatronics, isolated events +^Domain |Medium speed digital, signal integrity |Medium speed digital, signal integrity | 
-^Specification |100MHz, analogue, **4 channel**, OSD |100MHz, analogue, **4 channel**, OSD |50MHz, **1mV/div** +^Specification |100MHz, analogue, **4 channel**, OSD |100MHz, analogue, **4 channel**, OSD | 
-^::: |Autosetup |Autosetup |**Three channel**, **dual beam** +^::: |Autosetup |Autosetup | 
-^::: |Manual time/freq/voltage measurements|Manual time/freq/voltage measurements |**Analogue storage** +^::: |Manual time/freq/voltage measurements|Manual time/freq/voltage measurements | 
-^Condition |Fully functional|Fully functional |Functional, but triggering needs tewaking +^Condition |Fully functional|Fully functional | 
-^::: | |Plan on replacing X/Y mains capacitors plus electrolytics |Probably benefit from calibration and checking capacitors +^::: | |Plan on replacing X/Y mains capacitors plus electrolytics | 
-^::: | |May need to replace calibration battery |**Needs a PSU recap** for 100Hz display intensity ripple +^::: | |May need to replace calibration battery | 
-^Comments |**First choice** fast scope |**First choice** fast scope |**Sensitive**, **three** channels, good for **transient events** +^Comments |**First choice** fast scope |**First choice** fast scope | 
-^::: |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 | 
-^::: |Small size/weight |Medium size/weight | **Extender cards and manuals** for maintenance +^::: |Small size/weight |Medium size/weight | 
-^::: | |**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 +^::: | |**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. | 
-^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 | 
-^   |{{ :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 |}}  |
  
  
 === Location: High Shelf === === Location: High Shelf ===
-^Topward 7042 ^Metrotest OX8020 ^ +| ^Metrotest OX8020 ^ 
-^Location |High shelf, for use during workshops |High shelf, for when Kenwood CS4215 insufficient |  +^Location |High shelf, for when Kenwood CS4215 insufficient |  
-^Domain |Digital, mechatronics, when Kenwood CS4215 insufficient |Audio, mechatronics | +^Domain |Audio, mechatronics | 
-^Specification |**40MHz**, 5mV/div, analogue  |20MHz, **1mV/div**, hybrid analogue/digital +^Specification |20MHz, **1mV/div**, hybrid analogue/digital 
-^::: |**Dual timebase** |Dual timebase | +^::: |Dual timebase | 
-^::: |Standard controls |Limited DSO features | +^::: |Limited DSO features | 
-^::: |Manual voltage and time cursors | +^::: |Manual voltage and time cursors | 
-^::: |Prints HPGL/HP-PCL to centronics/serial | +^::: |Prints HPGL/HP-PCL to centronics/serial | 
-^Condition |Excellent – **everything just works** as expected |Fully functional | +^Condition |Fully functional | 
-^::: |**UI a little odd**; dim lights indicate important settings | +^::: |**UI a little odd**; dim lights indicate important settings | 
-^Comments |**Excellent scope** |**On loan** from Lee Wiltshire +^Comments |**On loan** from Lee Wiltshire 
-^::: |**Service and operation manual** |Similar to Kenwood CS4215, Topward 7042  | +^::: |Similar to Kenwood CS4215, Topward 7042  | 
-^::: |Lightweight  |Would be best low-end scope, except for awkward UI +^::: |Would be best low-end scope, except for awkward UI | 
-^::: |See also Kenwood, Metrotest | +^USP |Sensitive, printing |  
-^USP |Small, medium speed, easy |Sensitive, printing |  +^    | {{ :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