- Devices to fool the Power Meter - 1 Update
- Favorite electron tube circuit? - 2 Updates
- ADM-3A Wonky Until Warm - 1 Update
| bud-- <null@void.com>: Jun 25 09:16AM -0600 On 6/17/2020 7:10 AM, Chris Jones wrote: >> ** Yep. >>> Power factor correction might lower your power consumption, >> ** Oops, no it don't. Scam marketers are likely to say that the lower current directly lowers the Watts, which is a scam. > load. (It will also lower the wasted power in the cables before the > meter but since you don't pay for that, there is no financial incentive > for the consumer to fix it.) As far as have heard, the scam boxes are just a capacitor permanently connected across the line 1 - I suspect the capacitors do not change the power factor much, thus do not change the circuit current much - negligible change = negligible saving (see 2 for the advantage of lower current) 2 - As in the post above, power factor correction can lower the current, and thus wasted power in wire resistance, but only in the wiring from the meter to the scam box. Boxes are likely to be at the service - negligible length = negligible saving. 3 - Capacitors are likely permanently connected. When the motor/inductive load is off the capacitor still conducts a current. That produces wasted power (metered Watts) in the wire resistance. --------------------- I think it is in another post - in industries with lots of big motors the utility is likely to meter the inductive part of the load in a kVARh meter (volt-amps reactive). There is a significant VAR 'penalty' charged by the utility. That makes power factor correction a real-good-idea. (And the correction is a lot more sophisticated than the scam boxes.) But, as has been said, there is no power factor penalty for residential. |
| jjhudak4@gmail.com: Jun 24 10:48AM -0700 On Tuesday, June 23, 2020 at 2:07:08 PM UTC-4, Jon Elson wrote: > the ramp generator for horizontal sweep in oscilloscopes. Likely used in > radars as well. > Jon Yes it was. For a fascinating and informative reading of foundational radar technology, one might want to look at the books that came out of the MIT Rad Lab. PDFs can be found here: https://www.febo.com/pages/docs/RadLab/ Being a long time student of control theory, I looked at vol 25, Theory of Servomechanisms. The treatment of the theory is clear and complete and I was astounded to realize that my first control theory text book (affectionately paraphrased to "Dazzled and Hopeless" - I cant remember the actually spelling of the authors last names), contained almost a verbatim copy of the servomechanism volume. ahhh, the good times... John |
| root <NoEMail@home.org>: Jun 25 10:46AM > For a fascinating and informative reading of foundational radar technology, one might want to look at the books that came out of the MIT Rad Lab. PDFs can be found here: > https://www.febo.com/pages/docs/RadLab/ Wow, thanks for the link. |
| fynnashba@gmail.com: Jun 24 07:08PM -0700 On Friday, June 19, 2020 at 8:02:29 AM UTC+1, Tom Lake wrote: > I have an ADM-3A dumb terminal and when I first turn it on the display is squashed and the top line is mangled. After five minutes or so the display looks OK but is a little jumpy. After a few more minutes, the display is rock-solid and stays that way until the next time I turn it on cold. If I turn it off back on, the display is still fine as long as I don't let the ADM cool off first. Does anyone know what the problem might be? What to look for? After all the remedies You may also check the tube base and its connectors |
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