low-end scope
in [Design]
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From: krw on 4 Mar 2010 18:43 On Thu, 04 Mar 2010 08:33:03 -0800, Joerg <invalid(a)invalid.invalid> wrote: >Michael A. Terrell wrote: >> "krw(a)att.bizzzzzzzzzzzz" wrote: >>> On Wed, 03 Mar 2010 16:00:53 -0800, Joerg <invalid(a)invalid.invalid> wrote: >>> >>>> John Larkin wrote: >>>>> On Wed, 03 Mar 2010 13:04:13 -0800, Joerg <invalid(a)invalid.invalid> >>>>> wrote: >>>>> >>>>>> miso(a)sushi.com wrote: >>>>>>> On Mar 2, 5:22 pm, Joerg <inva...(a)invalid.invalid> wrote: >>>>>>>> Paul Keinanen wrote: >>>>>>>>> On Mon, 01 Mar 2010 12:32:34 -0800, John Larkin >>>>>>>>> <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: >>>>>>>> [...] >>>>>>>> >>>>>>>>>> I'd rather not have a scope that runs Windows and that needs two >>>>>>>>>> boxes, drivers, a USB cable, and a mouse to do anything. A real scope >>>>>>>>>> will most likely still be working 20 years from now. I like real >>>>>>>>>> scopes with lots of real knobs. >>>>>>>> Me, too :-) >>>>>>>> >>>>>>>>>> A USB scope would make sense in some data-centric application where >>>>>>>>>> the waveform needs to be shipped into Matlab or some such in real >>>>>>>>>> time. >>>>>>>>>> John >>>>>>>>> For me, built in battery power would be a critical requirement so that >>>>>>>>> you could use it as easily as a multimeter. >>>>>>>> Most DSOs such as mine come with a battery option. I didn't order that >>>>>>>> but AFAIK it runs several hours on a charge. >>>>>>>> >>>>>>>> [...] >>>>>>>> >>>>>>>> -- >>>>>>>> Regards, Joerg >>>>>>>> >>>>>>>> http://www.analogconsultants.com/ >>>>>>>> >>>>>>>> "gmail" domain blocked because of excessive spam. >>>>>>>> Use another domain or send PM. >>>>>>> That's one mighty expensive battery option: >>>>>>> <http://www.tesales.com/commerce/ccpc1009-2859-instek-gds-2000-battery- >>>>>>> option-for-gds--2000-seri-gds-2000-battery-gds-2000-battery.htm> >>>>>> Yeah, but you wouldn't want to know what mainstream manufacturers charge >>>>>> for this stuff. It's a boutique accessory, very few people need it, >>>>>> meaning low sales volume and somehow the NRE has to be amortized. Part >>>>>> of life :-) >>>>> >>>>> Our FLIR ir viewer came with two batteries. They look like old >>>>> camcorder batteries but have different terminals. They have finally >>>>> died, and FLIR wants $250 each for replacements. Luckily, the thing >>>>> can be run from 12 volts DC, so we just use it plugged in. Battery >>>>> life sucked anyhow, even when the batteries were new. >>>>> >>>> Maybe you could have it re-celled at a larger battery store. But battery >>>> life won't improve, there are some things that just aren't meant to be >>>> run on batteries. Instek claims the big GDS-2204 can run about 3h on a >>>> charge but I guess that only applies if the battery is fairly new. >>>> Charging is done gently, over 8h. It's a 73Wh battery. >>>> >>>> >>>>> They want $600 for a new charger. >>>>> >>>> No surprise there :-( >>> That's what we get for our battery charger, though it does charge five at a >>> time. I guess that's only $125 each. ;-) >> >> >> 5*125=625 >> > >Keith was probably including the credit card merchant fees :-) Rounding error (I really don't know what our price structure is).
From: Rich Webb on 5 Mar 2010 13:05 On Fri, 05 Mar 2010 09:19:00 -0800, Joerg <invalid(a)invalid.invalid> wrote: >I don't think anyoe would accept a scope with a wall wart, unless it was >super cheap. The Fluke Scopemeters are wall-warted when they're charging the battery. The early models were kind of clunky but the current generation are pretty decent, if a bit pricey. -- Rich Webb Norfolk, VA
From: Joerg on 5 Mar 2010 14:34 Rich Webb wrote: > On Fri, 05 Mar 2010 09:19:00 -0800, Joerg <invalid(a)invalid.invalid> > wrote: > >> I don't think anyoe would accept a scope with a wall wart, unless it was >> super cheap. > > The Fluke Scopemeters are wall-warted when they're charging the battery. > The early models were kind of clunky but the current generation are > pretty decent, if a bit pricey. > Ok, but I bet they aren't meant to be used during charge time. I was never a huge fan of those things. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 5 Mar 2010 15:42 John Larkin wrote: > On Fri, 05 Mar 2010 09:19:00 -0800, Joerg <invalid(a)invalid.invalid> > wrote: > [...] >> I don't think anyoe would accept a scope with a wall wart, unless it was >> super cheap. > > Our 4-channel isolated-channel TPS2024 uses a wart supply, and it > wasn't cheap. > Ugh. I am happy that my Instek 2204 has a real built-in wideband PSU. No looking around where the wall wart is after arriving at a client. Any standard power cable fits. It even came with a genuine Bri'ish power cable. > We use warts for all our products except where the power requirement > is too high. One recent gadget is a 3U rackmount spectroscopy > controller with an embedded Linux PC, hard drives, digitizers, arbs, > all sorts of stuff. It runs off a wart. > For fixed installations wall warts are ok, although a nuisance at times because they clog 2-3 positions on a power strip. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Michael A. Terrell on 6 Mar 2010 22:23
JosephKK wrote: > > Crikey, how big is that wall wart? It was continued on the next wall! ;-) -- Greed is the root of all eBay. |