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equipment:oscilloscopes [2017/04/28 12:11]
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.  +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 +
-  * 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.+
  
 ====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 |Topward 7042 |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 |Telequipment DM63 |Hameg HM203 |Gould OS300 |::: | +^::: |Agilent 54621 | |Topward 7042 | |::: | 
-^Digital |Agilent 54621 |Schlumberger 5602.C | |Tektronix TDS340 |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino | +^Digital |Agilent 54621 |Telequipment DM63 |Topward 7042  | |%%<=%%60MHz, 500mV-5V, - well-behaved logic e.g. Arduino | 
-^::: | |Topward 7042 | | |::: | +^::: | |Tektronix 2245 | | |::: | 
-^::: | |Telequipment DM63 | | |::: | +^::: | |IsoTech ISR-1014 | | |::: | 
-^Signal Integrity |Tektronix 2245 |Schlumberger 5602.C |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
 +^::: | |IsoTech ISR-1014 | | |::: |
 ^High-speed |  -  |  -  |  -  |  -  |>=250MHz, note not MS/s! | ^High-speed |  -  |  -  |  -  |  -  |>=250MHz, note not MS/s! |
  
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 === Location: Electronics Test Bench === === Location: Electronics Test Bench ===
-| ^Kenwood CS4125 ^Agilent 54621 ^Tektronix 2245 +| ^Kenwood CS4125 ^Agilent 54621 ^ 
-^Location |Test bench, since small and lightweight |Test bench, since small and lightweight |Test bench, our most capable scope +^Location |Test bench, since small and lightweight |Test bench, since small and lightweight | 
-^Domain |Audio, mechatronics |Digital, mechatronics |Medium speed digital, signal integrity +^Domain |Audio, mechatronics |Digital, mechatronics | 
-^Specification |20MHz, **1mV/div**, analogue |60MHz, 10mV/div, digital |100MHz, analogue4 channel +^Specification |20MHz, **1mV/div**, analogue |60MHz, 10mV/div, digital, OSD 
-^::: | |IEEE-488 interface |Autosetup +^::: | |IEEE-488 interface | 
-^::: | |Waveform capture/measurements |Manual time/freq/voltage measurements | +^::: | |Waveform capture/measurements | 
-^Condition |Excellent – **everything just works** |Fully functional  |Fully functional +^Condition |Excellent – **everything just works** |Fully functional 
-^::: |Good standard controls |Floppy inaccessible, repair unknown |Plan on replacing X/Y mains capacitors +^::: |Good standard controls |Floppy inaccessible, repair unknown | 
-^::: | |Adequate UI |Plan on replacing some electrolytics +^::: | |Adequate UI | 
-^Comments |**First choice** low-end scope |**First choice** digital scope |**First choice** fast scope | +^Comments |**First choice** low-end scope |**First choice** digital scope | 
-^::: |**Excellent for casual use** |UI makes it less suitable for casual use | "Soft knobs" require movement before they work +^::: |**Excellent for casual use** |UI makes it less suitable for casual use | 
-^::: |Most sensitive scope |Potential printout via IEEE-488 or floppy +^::: |Most sensitive scope |Potential printout via IEEE-488 or floppy | 
-^::: |See also Metrotest, Topward | | +^::: |See also Metrotest, Topward | | 
-^USP |Small, easy, sensitive |Small, easy, fast |Fast, 4 channels, standard controls +^USP |Small, easy, sensitive |Small, easy, fast | 
-^    |{{ :oscilloscope:kenwood-cs4124.jpg?direct&100 |}}|{{ :oscilloscope:agilent-54621a.jpg?direct&100 |}} |{{ :oscilloscope:tektronix2245.jpg?direct&100 |}} |+^    |{{ :oscilloscope:kenwood-cs4124.jpg?direct&100 |}}|{{ :oscilloscope:agilent-54621a.jpg?direct&100 |}} |
  
 === Location: Accessible Shelf Above Test Bench=== === Location: Accessible Shelf Above Test Bench===
-| ^Schlumberger 5602.C ^Topward 7042 ^Telequipment DM63 ^ +| ^IsoTech ISR-1014 ^Tektronix 2245 ^Telequipment DM63 ^ 
-^Location |**Floor** under test bench, on end |Test bench shelf | 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 |Digitalmechatronics, when Kenwood CS4215 insufficient |Sensitive audio, mechatronics, isolated events | +^Domain |Medium speed digital, signal integrity |Medium speed digitalsignal integrity |Sensitive audio, mechatronics, isolated events | 
-^Specification |100MHz, 10mV/divdigital |**40MHz**, 5mV/div, analogue |50MHz, **1mV/div** | +^Specification |100MHz, analogue, **4 channel**, OSD |100MHz, analogue, **4 channel**, OSD |50MHz, **1mV/div** | 
-^::: |IEEE488 interface |**Dual timebase** |**Three channel**, **dual beam** | +^::: |Autosetup |Autosetup |**Three channel**, **dual beam** | 
-^::: |Waveform capture/measurements |Standard controls |**Analogue storage** | +^::: |Manual time/freq/voltage measurements|Manual time/freq/voltage measurements |**Analogue storage** | 
-^Condition |Fully functional |Excellent – **everything just works** as expected |Fully functional | +^Condition |Fully functional|Fully functional |Functional, but triggering needs tewaking 
-^::: |**Appalling UI** | |Probably benefit from calibration and checking capacitors | +^::: | |Plan on replacing X/Y mains capacitors plus electrolytics |Probably benefit from calibration and checking capacitors | 
-^::: |Heavy, big, cannot keep on high/weak shelf | | | +^::: | |May need to replace calibration battery |**Needs a PSU recap** for 100Hz display intensity ripple 
-^Comments |The **highest speed scope**|**Excellent scope** |**Sensitive**, **three** channels, good for **transient events** | +^Comments |**First choice** fast scope |**First choice** fast scope |**Sensitive**, **three** channels, good for **transient events** | 
-^::: | Not for casual use  |**Service and operation manual** |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 | 
-^::: |Potential printout via IEEE-488 |Lightweight | **Extender cards and manuals** for maintenance | +^::: |Small size/weight |Medium size/weight | **Extender cards and manuals** for maintenance | 
-^::: | |See also KenwoodMetrotest |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 |100MHz |Smallmedium speedeasy | Sensitive, three channel, storage | +^USP |Fast, 4 channels |Fast4 channelsexcellent triggering, standard controls | Sensitive, three channel, storage | 
-   |{{ :oscilloscope:schlumberger-5602c.jpg?direct&100 |}} |{{ :oscilloscope:topward-7042.jpg?direct&100 |}} |{{ :oscilloscope:telequipmentDM63.jpg?direct&100 |}} |+  |{{ :oscilloscope:isotech-isr1014.jpg?direct&100 |}} |{{ :oscilloscope:tektronix2245.jpg?direct&100 |}}  |{{ :oscilloscope:telequipmentDM63.jpg?direct&100 |}} |
  
  
 === Location: High Shelf === === Location: High Shelf ===
-| ^Hameg HM203 ^Metrotest OX8020 ^+| ^Topward 7042 ^Metrotest OX8020 ^
 ^Location |High shelf, for use during workshops |High shelf, for when Kenwood CS4215 insufficient |  ^Location |High shelf, for use during workshops |High shelf, for when Kenwood CS4215 insufficient | 
-^Domain |Audio, mechatronics |Audio, mechatronics | +^Domain |Digital, mechatronics, when Kenwood CS4215 insufficient |Audio, mechatronics | 
-^Specification |20MHz, 5mV/div, analogue |20MHz, **1mV/div**, hybrid analogue/digital +^Specification |**40MHz**, 5mV/div, analogue  |20MHz, **1mV/div**, hybrid analogue/digital 
-^::: | |Dual timebase | +^::: |**Dual timebase** |Dual timebase | 
-^::: | |Limited DSO features |+^::: |Standard controls |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 |Mainly functional, works nicely |Fully functional | +^Condition |Excellent – **everything just works** as expected |Fully functional | 
-^::: |Poor or strange controls |**UI a little odd**; dim lights indicate important settings +^::: | |**UI a little odd**; dim lights indicate important settings | 
-^::: |X-shift knob missing | +^Comments |**Excellent scope** |**On loan** from Lee Wiltshire 
-^Comments |OK, unremarkable |**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 |Nothing => candidate for disposal |Sensitive, printing |  +^USP |Small, medium speed, easy |Sensitive, printing |  
-^    | {{ :oscilloscope:hameg-hm203.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 +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 TDS340, Schlumberger 5602.CHameg HM203. 
-^Location |Dispose |Disposefor use  |Dispose | + 
-^Domain |Generalaudio, mechatronics |General, audio, mechatronics |Digital, signal integrity | +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. 
-^Specification |20MHz, 5mV/div, analogue |20MHz, 2mV/div, analogue |100MHz, 1V/div, digital | + 
-^::: |Dual timebase | |Display saved on floppy | +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 | + 
-^::: |Some channel crosstalk |Some channel crosstalk |Ch2 only 1V/div and above | +==== Current Scope Location ==== 
-^::: |Trigger on -ve slope broken |External trig broken |Adequate UI | + 
-^::: |Delayed timebase noisy | | +(this will be updated after the move)
-^::: |Ch1Ch2 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 | +
-^::: |Repair required |Usable without external trig |Repair required, hybrids unobtanium | +
-^::: | |Lightweight |{{ :oscilloscope:tektronix-tds340.jpg?direct&100 |}} |+
  
 +{{ :equipment:oscilloscopes_a.jpg?nolink |}}
 +{{ :equipment:oscilloscopes_b.jpg?nolink |}}
  
  
  • equipment/oscilloscopes
  • Last modified: 12 months ago
  • by tggzzz