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equipment:oscilloscopes [2018/11/22 23:16]
tggzzz
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.  
- 
-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. **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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 | ^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 |Telequipment DM63 |Metrotest OX8020 | |<100kHz, mV - audio signals, sensors |
-^Mechatronics |Kenwood CS4125 |Telequipment DM63 |Metrotest OX8020 |Wavetek 9020 |<10MHz, 50mV-50V, - motors, actuators, machines | +^Mechatronics |Kenwood CS4125 |Telequipment DM63 |Metrotest OX8020 | |<10MHz, 50mV-50V, - motors, actuators, machines | 
-^::: |Agilent 54621 | |Topward 7042 |Gould OS300 |::: | +^::: |Agilent 54621 | |Topward 7042 | |::: | 
-^::: | | | |Hameg HM203 |::: | +^Digital |Agilent 54621 |Telequipment DM63 |Topward 7042  | |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino | 
-^Digital |Agilent 54621 |Telequipment DM63 |Topward 7042  |Tektronix TDS340 |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino | +^::: | |Tektronix 2245 | | |::: | 
-^::: | |Tektronix 2245 | |Schlumberger 5602.C |::: | +^::: | |IsoTech ISR-1014 | | |::: | 
-^Signal Integrity | |Tektronix 2245 | |Tektronix TDS340 |>=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| 
-^::: | | | |Schlumberger 5602.C |::: |+^::: | |IsoTech ISR-1014 | | |::: |
 ^High-speed |  -  |  -  |  -  |  -  |>=250MHz, note not MS/s! | ^High-speed |  -  |  -  |  -  |  -  |>=250MHz, note not MS/s! |
  
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 ^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 |
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 === Location: Accessible Shelf Above Test Bench=== === Location: Accessible Shelf Above Test Bench===
-| ^Tektronix 2245 ^Telequipment DM63 ^ +^IsoTech ISR-1014 ^Tektronix 2245 ^Telequipment DM63 ^ 
-^Location |Test benchshelf, to reduce chance of accidental damage  | Test bench shelf | +^Location |Test bench shelf|Test bench shelf, to reduce chance of accidental damage  | Test bench shelf | 
-^Domain |Medium speed digital, signal integrity |Sensitive audio, mechatronics, isolated events | +^Domain |Medium speed digital, signal integrity |Medium speed digital, signal integrity |Sensitive audio, mechatronics, isolated events | 
-^Specification |100MHz, analogue, 4 channel |50MHz, **1mV/div** | +^Specification |100MHz, analogue, **4 channel**, OSD |100MHz, analogue, **4 channel**, OSD |50MHz, **1mV/div** | 
-^::: |Autosetup |**Three channel**, **dual beam** | +^::: |Autosetup |Autosetup |**Three channel**, **dual beam** | 
-^::: |Manual time/freq/voltage measurements |**Analogue storage** | +^::: |Manual time/freq/voltage measurements|Manual time/freq/voltage measurements |**Analogue storage** | 
-^Condition |Fully functional |Functional, but triggering needs tewaking | +^Condition |Fully functional|Fully functional |Functional, but triggering needs tewaking | 
-^::: |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 |Probably benefit from calibration and checking capacitors | 
-^::: |May need to replace calibration battery |**Needs a PSU recap** for 100Hz display intensity ripple | +^::: |May need to replace calibration battery |**Needs a PSU recap** for 100Hz display intensity ripple | 
-^Comments |**First choice** fast scope |**Sensitive**, **three** channels, good for **transient events** | +^Comments |**First choice** fast scope |**First choice** fast scope |**Sensitive**, **three** channels, good for **transient events** | 
-^::: |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 | 
-^::: |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, excellent triggering, standard controls | Sensitive, three channel, storage | +^USP |Fast, 4 channels |Fast, 4 channels, excellent triggering, standard controls | Sensitive, three channel, storage | 
-   |{{ :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 ===
-| ^ 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 9020Gould OS300Tek TDS340Schlumberger 5602.CHameg HM203. 
-^Location |Dispose |Dispose, for use  |Dispose | Dispose for masochist's use |Dispose, for use | + 
-^Domain |Generalaudio, mechatronics |General, audio, mechatronics |Digital, signal integrity |Medium speed digital, signal integrity |Audio, mechatronics | +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 |20MHz, 5mV/div, analogue |20MHz, 2mV/div, analogue |100MHz, 1V/div, digital |100MHz, 10mV/div, digital |20MHz, 5mV/div, analogue | + 
-^::: |Dual timebase | |Display saved on floppy | Waveform capture/measurementsIEEE488 interface | | +If you want to see their featureslook at an earlier revision of this page. 
-^Condition |Some ringing on digital transition |Some ringing on digital transition |Ch1 broken |Fully functional |Mainly functional, works nicely | + 
-^::: |Some channel crosstalk |Some channel crosstalk |Ch2 only 1V/div and above | |Poor or strange controls | +==== Current Scope Location ==== 
-^::: |Trigger on -ve slope broken |External trig broken |Adequate UI | |X-shift knob missing | + 
-^::: |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 |Higher speed, screen capture |**Appalling UI**, not for casual use |OK, unremarkable | +
-^::: |Repair required |Usable without external trig |Repair required, hybrids unobtanium |High speed, heavy  | | +
-^::: | |Lightweight |{{ :oscilloscope:tektronix-tds340.jpg?direct&100 |}} |{{ :oscilloscope:schlumberger-5602c.jpg?direct&100 |}} | {{ :oscilloscope:hameg-hm203.jpg?direct&100 |}}|+
  
 +{{ :equipment:oscilloscopes_a.jpg?nolink |}}
 +{{ :equipment:oscilloscopes_b.jpg?nolink |}}
  
  
  • equipment/oscilloscopes
  • Last modified: 12 months ago
  • by tggzzz