Re: Rigol scope

From	Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups	sci.electronics.design
Subject	Re: Rigol scope
Date	2025-08-14 20:03 +0000
Organization	A noiseless patient Spider
Message-ID	<107lff7$n3pf$1@dont-email.me> (permalink)
References	(2 earlier) <61tn9k133mcqekn35qngldsc9qtf2g4jrt@4ax.com> <107j9jf$6faa$1@dont-email.me> <l5iq9k9038jom8t0qflr8juv7ib3tb67rt@4ax.com> <7f605d0a-f30c-7620-d828-0964ed29d1f3@electrooptical.net> <ccds9kpjb1n5jc5d8fihno2uj57nrdiqm8@4ax.com>

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john larkin <jl@glen--canyon.com> wrote:
> On Thu, 14 Aug 2025 14:29:20 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
> 
>> On 2025-08-13 22:47, john larkin wrote:
>>> On Thu, 14 Aug 2025 02:11:26 +0200, Klaus Kragelund
>>> <klauskvik@hotmail.com> wrote:
>>> 
>>>> On 13/08/2025 04:17, john larkin wrote:
>>>>> On Tue, 12 Aug 2025 21:14:55 -0000 (UTC), Sergey Kubushyn
>>>>> <ksi@koi8.net> wrote:
>>>>> 
>>>>>> john larkin <jl@glen--canyon.com> wrote:
>>>>>>> https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
>>>>>>> 
>>>>>>> That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
>>>>>>> logic analyzer, $764 overnight with free shipping.
>>>>>>> 
>>>>>>> I remember when a 30 MHz dual channel scope cost more than a
>>>>>>> Chevrolet.
>>>>>>> 
>>>>>>> The fad in test equipment is black this year. Ugly.
>>>>>> 
>>>>>> Very nice scope. I have 2 at home (electronic and programming desk, separate
>>>>>> at opposite ends of the room) -- I work 100% from home -- and we purchased a
>>>>>> whole bunch of those for a company to use as everyday scope. We have a 50GHz
>>>>>> Tektronix in its dedicated room for signal integrity and other high
>>>>>> frequency testing but those DHO924S ones are on every desk now.
>>>>>> 
>>>>>> I really like it, even put my beloved Tek 2467B that I used before for
>>>>>> almost everything on a far shelf and never used it ever since. Have a
>>>>>> monster 4GHz 40Gsps LeCroy WR640Zi with all options on my electronic desk
>>>>>> too but don't remember where I powered it up last time -- it is 8-bit,
>>>>>> extremely complex, makes noise like a jet at takeoff so it is only used when
>>>>>> that bandwidth and those advanced options are really needed that is
>>>>>> extremely rare.
>>>>> 
>>>>> We have a 7 GHz LeCroy that nobody uses. The menus make no sense and
>>>>> even LeCroy doesn't understand them.
>>>>> 
>>>>> 
>>>>>> 
>>>>>> DHO924S covers almost everything. Logic Analyzer is pretty basic but
>>>>>> sufficient for almost everything so my another jet sounding monster, HP
>>>>>> 16702B, also gathers dust now.
>>>>>> 
>>>>>> Very happy with it, would recommend to everybody.
>>>>>> 
>>>>>> ---
>>>>>> ******************************************************************
>>>>>> *  KSI@home    KOI8 Net  < >  The impossible we do immediately.  *
>>>>>> *  Las Vegas   NV, USA   < >  Miracles require 24-hour notice.   *
>>>>>> ******************************************************************
>>>>> 
>>>>> We have maybe 20 of various Rigol scopes and I don't think any of them
>>>>> has ever broken.
>>>>> 
>>>>> We do have one Tek scope with galvanically isolated inputs and
>>>>> trigger.  That can be very handy.
>>>>> 
>>>> I have the HDO1074, hacked to 250MHz and a Siglent 100MHz scope, hacked
>>>> to 750MHz. Never uses the Old tek scope any more.
>>> 
>>> My bench scope is a 350 MHz Rigol hacked to 500. We bought four and
>>> they threw in the upgrade. But 750/100 is an outrageous ratio.
>> 
>> We bought this little 2-channel, 200-MHz Siglent for a road trip--$300 
>> open box from Saelig.
>> 
>>>> 
>>>> Last week I discovered the first failure of any scope I ever had, the
>>>> Siglent behaved funny, non liniear input behaviour. Turned out I was
>>>> careless, in an earlier test with conducted immunity, I had monitoring
>>>> directly on the scope input and fried the channel. Now I have a 3
>>>> channel scope, repair is almost the same price as a new one :-(
>>> 
>>> One thing I've noticed about digital scopes, and told the kids today.
>>> Using the external trigger, jitter is higher than when triggering off
>>> a vertical channel. External trigs are often quantized to the ADC
>>> clock rate, but a channel trigger works off the software-filtered
>>> waveforms.
>> 
>> Yup.  The external trigger is useless for fast stuff.  Another good 
>> argument for a 4-channel scope.
>> 
>> 
>>> My summer intern built a GaN fet based 650 volt pulse generator with a
>>> transmission-line output transformer. Six different versions,
>>> actually.
>>> 
>>> 650 volts into 50 ohms is 13 amps, in about 2 ns. The opportunities
>>> for ground loops and oscillation are multitude, but it works nicely. I
>>> might post pics.
>> 
>> Sure, why not?  Sounds fun.
>> 
>> Cheers
>> 
>> Phil Hobbs
> 
> 
> https://www.dropbox.com/scl/fi/hsrh23rj2vrjxtjbmgzkj/X112-650V.jpg?rlkey=2xxuh9x0fzesbizq25e43b52z&raw=1
> 
> https://www.dropbox.com/scl/fi/me2sb6vrco8nxh3h2vo9b/X112_Bench.jpg?rlkey=ebl9rqw7l26cf4qpnk1vgywcm&raw=1
> 
> That's making isolated 650 volt pulses into 50 ohms. I pointed out to
> him that he's putting 13 amps and 8.5 kilowatts into a 2-watt
> MiniCircuits 40 dB attenuator.
> 
> I'm not sure if we have a use for this, but it is fun.
> 
> We also tested the EPC23104 monolithic GaN half-bridge driver. It blew
> up. Not ready for prime time, looks like. 
> 
> 
> 
> 
> 

Nice!

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics

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Thread

Rigol scope john larkin <jl@glen--canyon.com> - 2025-08-12 12:33 -0700
  Re: Rigol scope Carl <carl.ijamesXX@YYverizon.net> - 2025-08-12 16:42 -0400
    Re: Rigol scope Sergey Kubushyn <ksi@koi8.net> - 2025-08-12 21:22 +0000
    Re: Rigol scope liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-08-13 10:10 +0100
      Re: Rigol scope Jan Panteltje <alien@comet.invalid> - 2025-08-13 10:14 +0000
        Re: Rigol scope liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-08-14 11:08 +0100
          Re: Rigol scope Jan Panteltje <alien@comet.invalid> - 2025-08-14 11:24 +0000
          Re: Rigol scope "Edward Rawde" <invalid@invalid.invalid> - 2025-08-14 14:16 -0400
            Re: Rigol scope liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-08-14 21:15 +0100
          Re: Rigol scope Jan Panteltje <alien@comet.invalid> - 2025-08-15 06:28 +0000
            Re: Rigol scope liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-08-15 10:39 +0100
  Re: Rigol scope Sergey Kubushyn <ksi@koi8.net> - 2025-08-12 21:14 +0000
    Re: Rigol scope john larkin <jl@glen--canyon.com> - 2025-08-12 19:17 -0700
      Re: Rigol scope Klaus Kragelund <klauskvik@hotmail.com> - 2025-08-14 02:11 +0200
        Re: Rigol scope john larkin <jl@glen--canyon.com> - 2025-08-13 19:47 -0700
          Re: Rigol scope Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2025-08-14 14:29 -0400
            Re: Rigol scope john larkin <jl@glen--canyon.com> - 2025-08-14 12:27 -0700
              Re: Rigol scope Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2025-08-14 20:03 +0000
  Re: Rigol scope john larkin <jl@glen--canyon.com> - 2025-08-15 06:54 -0700
    Re: Rigol scope Jeff Liebermann <jeffl@cruzio.com> - 2025-08-15 07:20 -0700
      Re: Rigol scope john larkin <jl@glen--canyon.com> - 2025-08-15 08:24 -0700
        Re: Rigol scope Jeff Liebermann <jeffl@cruzio.com> - 2025-08-15 09:10 -0700
    Re: Rigol scope JM <sunaecoNoChoppedPork@gmail.com> - 2025-08-15 22:57 +0100
    Re: Rigol scope bitrex <user@example.net> - 2025-08-15 19:49 -0400

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