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:oscilloscopes [2017/04/20 10:09]
tggzzz
equipment:oscilloscopes [2020/10/24 11:16] (current)
tggzzz
Line 1: Line 1:
 ===== 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.  
- 
-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 
-  * dispose, because poor quality or too many duplicates or slightly faulty 
- 
-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.+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. 
Line 42: Line 32:
 (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 //(this will be updated after the move)//:
 +  * 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**.
  
  
Line 50: Line 56:
  
 | ^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 |Tektronix DM63 |Metrotest OX8020 | |<100kHz, mV - audio signals, sensors | +^Audio |Kenwood CS4125 | |Metrotest OX8020 | |<100kHz, mV - audio signals, sensors | 
-^Mechatronics |Kenwood CS4125 |Topward 7042 |Metrotest OX8020 |Wavetek 9020 |<10MHz, 50mV-50V, - motors, actuators, machines | +^Mechatronics |Kenwood CS4125 | |Metrotest OX8020 | |<10MHz, 50mV-50V, - motors, actuators, machines | 
-^::: |Agilent 54621 |Tektronix DM63 |Hameg HM203 |Gould OS300 |::: | +^::: |Agilent 54621 | | | |::: | 
-^Digital |Agilent 54621 |Schlumberger 5602.C |Tektronix TDS340 | |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino +^Digital |Agilent 54621 |IsoTech ISR-1014  | |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino | 
-^::: | |Topward 7042 | | |::: +^::: | |Tektronix 2245 | | |::: | 
-^::: | |Tektronix DM63 | | |::: | +^Signal Integrity | |Tektronix 2245 | | |>=100MHz, 500mV-5V, medium-speed logic and checking valid logic levels, e.g. generic TTL, CMOS
-^Signal Integrity | |Schlumberger 5602.C |Tektronix TDS340 | |>=100MHz, 500mV-5V, medium-speed logic and checking valid logic levels, e.g. generic TTL, CMOS|+^::: | |IsoTech ISR-1014 | | |::: |
 ^High-speed |  -  |  -  |  -  |  -  |>=250MHz, note not MS/s! | ^High-speed |  -  |  -  |  -  |  -  |>=250MHz, note not MS/s! |
  
Line 67: Line 73:
 ^Location |Test bench, since small and lightweight |Test bench, since small and lightweight | ^Location |Test bench, since small and lightweight |Test bench, since small and lightweight |
 ^Domain |Audio, mechatronics |Digital, mechatronics | ^Domain |Audio, mechatronics |Digital, mechatronics |
-^Specification |20MHz, **1mV/div**, analogue |60MHz, 10mV/div, digital |+^Specification |20MHz, **1mV/div**, analogue |60MHz, 10mV/div, digital, OSD |
 ^::: | |IEEE-488 interface | ^::: | |IEEE-488 interface |
 ^::: | |Waveform capture/measurements | ^::: | |Waveform capture/measurements |
Line 81: Line 87:
  
 === Location: Accessible Shelf Above Test Bench=== === Location: Accessible Shelf Above Test Bench===
-| ^Schlumberger 5602.C ^Topward 7042 +| ^IsoTech ISR-1014 ^Tektronix 2245 
-^Location |**Floor** under test bench, on end, for high speed measurement |Test bench shelf, for when Kenwood CS4215 insufficient |  +^Location |Test bench shelf|Test bench shelf, to reduce chance of accidental damage  
-^Domain |Medium speed digital, signal integrity |Digitalmechatronics +^Domain |Medium speed digital, signal integrity |Medium speed digitalsignal integrity 
-^Specification |100MHz, 10mV/divdigital |**40MHz**, 5mV/div, analogue | +^Specification |100MHz, analogue, **4 channel**, OSD |100MHz, analogue, **4 channel**, OSD 
-^::: |IEEE488 interface |**Dual timebase** +^::: |Autosetup |Autosetup 
-^::: |Waveform capture/measurements |Standard controls +^::: |Manual time/freq/voltage measurements|Manual time/freq/voltage measurements 
-^Condition |Fully functional |Excellent – **everything just works** as expected +^Condition |Fully functional|Fully functional 
-^::: |**Appalling UI** | | +^::: | |Plan on replacing X/Y mains capacitors plus electrolytics 
-^::: |Heavy, big, cannot keep on high/weak shelf | | +^::: | |May need to replace calibration battery 
-^Comments |The **highest speed scope**|**Excellent scope** | +^Comments |**First choice** fast scope |**First choice** fast scope 
-^::: | Not for casual use  |**Service and operation manual** +^::: |Equivalent to the Tek 2245, but softbutton menus slightly less suitable for casual use |Move "soft knobs" in both directions, including after autosetup 
-^::: |Potential printout via IEEE-488 |Lightweight +^::: |Small size/weight |Medium size/weight 
-^::: | |See also KenwoodMetrotest +^::: | |**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 |100MHz |Smallmedium speedeasy +^USP |Fast, 4 channels |Fast4 channelsexcellent triggering, standard controls 
-   |{{ :oscilloscope:schlumberger-5602c.jpg?direct&100 |}} |{{ :oscilloscope:topward-7042.jpg?direct&100 |}} |+  |{{ :oscilloscope:isotech-isr1014.jpg?direct&100 |}} |{{ :oscilloscope:tektronix2245.jpg?direct&100 |}}  |
  
  
 === Location: High Shelf === === Location: High Shelf ===
-^Tek TDS340 ^Hameg HM203 ^Metrotest OX8020 ^ +| ^Metrotest OX8020 ^ 
-^Location |High shelf, for occasional use |High shelf, for use during workshops |High shelf, for when Kenwood CS4215 insufficient |  +^Location |High shelf, for when Kenwood CS4215 insufficient |  
-^Domain |Digital, signal integrity |Audio, mechatronics |Audio, mechatronics | +^Domain |Audio, mechatronics | 
-^Specification |100MHz, 1V/div, digital |20MHz, 5mV/div, analogue |20MHz, **1mV/div**, hybrid analogue/digital +^Specification |20MHz, **1mV/div**, hybrid analogue/digital 
-^::: |**Display saved on floppy** | |Dual timebase | +^::: |Dual timebase | 
-^::: | | |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 |Ch1 broken |Mainly functional, works nicely |Fully functional | +^Condition |Fully functional | 
-^::: |Ch2 only 1V/div and above |Poor or strange controls |**UI a little odd**; dim lights indicate important settings +^::: |**UI a little odd**; dim lights indicate important settings | 
-^::: |Adequate UI |X-shift knob missing | | +^Comments |**On loan** from Lee Wiltshire 
-^::: |Light | | +^::: |Similar to Kenwood CS4215, Topward 7042  | 
-^Comments |One of the **higher speed** scopes |OK, unremarkable |**On loan** from Lee Wiltshire +^::: |Would be best low-end scope, except for awkward UI | 
-^::: |**Only scope with screen capture** | |Similar to Kenwood CS4215, Topward 7042  | +^USP |Sensitive, printing |  
-^::: |Dispose //after// we get another 100MHz scope with screen capture. | |Would be best low-end scope, except for awkward UI | +^    | {{ :oscilloscope:metrotest-ox8020.jpg?direct&100 |}}|
-^USP |Screen capture |Nothing => candidate for disposal |Sensitive, printing |  +
-^    |{{ :oscilloscope:tektronix-tds340.jpg?direct&100 |}} | {{ :oscilloscope:hameg-hm203.jpg?direct&100 |}}| {{ :oscilloscope:metrotest-ox8020.jpg?direct&100 |}}| +
  
 === For Disposal === === For Disposal ===
-| ^ Wavetek 9020 ^Gould OS300 +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 9020Gould OS300, Tek TDS340Schlumberger 5602.CHameg HM203. 
-^Location |Dispose |Disposefor use  | + 
-^Domain |General, audio, mechatronics |Generalaudiomechatronics | +To make more room and to reduce the equipment that needed to be moved to the new premisesin October 2020 we disposed of the Tektronix DM63 and the Topward 7042. 
-^Specification |20MHz5mV/div, analogue |20MHz, 2mV/div, analogue | + 
-^::: |Dual timebase | | +If you want to see their features, look at an earlier revision of this page. 
-^Condition |Some ringing on digital transition |Some ringing on digital transition | + 
-^::: |Some channel crosstalk |Some channel crosstalk | +==== Current Scope Location ==== 
-^::: |Trigger on -ve slope broken |External trig broken | + 
-^::: |Delayed timebase noisy | | +(this will be updated after the move)
-^::: |Ch1, Ch2 uncal switch noisy | | +
-^::: |Vert mode controls quirky | | +
-^::: |Poor but could be functional |Usable for simple purposes | +
-^Comments |Adequate low-end scope |Adequate low-end scope | +
-^::: |Repair required |Usable without external trig | +
-^::: | |Lightweight |+
  
 +{{ :equipment:oscilloscopes_a.jpg?nolink |}}
 +{{ :equipment:oscilloscopes_b.jpg?nolink |}}
  
  
  • equipment/oscilloscopes.1492679397
  • Last modified: 5 years ago
  • by tggzzz