| ID: | 4248 |
| From: | Robin Laing <Me...@TelusPlanet.net> |
| Date: | Mon, 6 Jul 2020 10:09:43 -0600 |
| Subject: | Re: [pcb-rnd] Off topic (maybe) - Spice simulator |
| in-reply-to: | 4232 from Evan Foss <ev...@gmail.com> |
Hi Evan, I fully agree with you. I have a large amount of components at home and can test almost anything. High Voltages systems are fun. I had to repair some HV systems for someone a few years ago. 50KV and insulation was the breaking down as well as other operator issues. Found out that JB Weld is a pretty good insulator and has the strength where needed. Also a high temp gasket compound works well as combination adhesive and insulator. Robin On 29/06/2020 16:40, Evan Foss wrote: > Hi Robin, > > I understand. COVID-19 has me effectively locked out of our lab. I > guess I am lucky in that I at least have a pile of test equipment to > use. > > I ask about the experimental setup because it's easy for students to > mess up without realizing it on experimental setup. Tektronix CRT > oscilloscopes have a common fault of turning off with a pop because > the older flyback output cables can have moisture in their insulation > which can arc through without leaving much of a mark to see with the > naked eye. I could see an experimental setup designed to arc having > this issue. > > I used multisim in college and actually it's predecessor Electronics > WorkBench in middle school. It's ok but I wish they published more > complete errata for all the models and the spice engine. > > Evan > > Evan > > On Mon, Jun 29, 2020 at 5:18 PM Robin Laing <MeSat@telusplanet.net> wrote: >> >> Hello, Evan, >> >> I really don't know what the setup is. I do know that it is to generate >> a timed, high energy pulse but due to COVID-19 and working at home, I am >> not deeply involved in that phase of the project. It is in the hands of >> an engineer (Not Electronics). >> >> Some discussion was brought up about simulation issues in Multisim in a >> teleconference and I thought I would ask the list. From teleconference >> today, information that members of this group provided have been helpful >> but I don't know in what way. >> >> Robin >> >> >> On 26/06/2020 15:27, Evan Foss wrote: >>> What does your experimental setup look like? I am picturing something >>> like a digital version of Tesla's lab in NY. >>> >>> On Fri, Jun 26, 2020 at 3:46 PM Robin Laing <MeSat@telusplanet.net> wrote: >>>> >>>> On 24/06/2020 13:48, gene glick wrote: >>>>> Ok, I see your point and I agree. I was just trying to get a 1st order >>>>> approximation for the simulator. >>>>> >>>>> In my experience, and probably originally preached by Bob Pease, don't >>>>> get lost in the simulator. Get close enough, then build it. >>>>> >>>>> You can spend a lifetime trying to get an exact response from >>>>> simulation... trying to work out everything virtually... only to find in >>>>> the real world that it behaves a lot different. >>>>> >>>>> Spice takes a long time to run. Dumb down your circuits enough to get >>>>> at the most important stuff... then prototype it. >>>> >>>> I wish I could beat this into some peoples brains. They expect models >>>> to be perfect all the time. >>>> >>>> I have been told that if the model isn't working, then we have to look >>>> at different tools to model it better. I think that is part of the >>>> issue in this case. Simulation says one thing, real world says >>>> something else. In our case, the real world is the problem and we do >>>> need to be closer to the simulation. I am thinking that the real world >>>> is related to the way that the circuit was constructed as a big part to >>>> the issues. >>>> >>>> Robin >>>> >>>> >>>> >>> >>> >>
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4248 Re: [pcb-rnd] Off topic (maybe) - Spice simulator from Robin Laing <Me...@TelusPlanet.net>