ajhawkins said:... a .005pF capacitor is it not? ...where to find such an odd part?
You can make a 5 femtofarad capacitor by placing 2 wires within a foot of each other.
But really, it's probably actually 0.005 mF or 0.005 uF. You're not supposed to post the schematic because of the whole copyright thing, but perhaps you can show us a small section of it, so that we can figure it out...
Schematic
I found it on the web so I dont think EICO will sue *knock on wood*
http://engr.uark.edu/~lar/hft90s.gif
its too large to upload with the 100k cap.
I found it on the web so I dont think EICO will sue *knock on wood*
http://engr.uark.edu/~lar/hft90s.gif
its too large to upload with the 100k cap.
"mmf" generally means micro-micro-farad, or yes indeed, picofarad. Must be a typo.
*I think* it's before the days of standardized Greek symbols for orders of magnitude (µ, etc.), in any case it doesn't mean "mili-mili-force" as today's symbols would say. )
.005 would generally refer to µF, or 5nF, or 5,000pF.
<Schematic finally downloaded> Ah, that is weird... huh. Maybe they did mean "mili-mili" for some strange reason.
Nah that can't be, cuz they have "mfd" there as well...
Tim
*I think* it's before the days of standardized Greek symbols for orders of magnitude (µ, etc.), in any case it doesn't mean "mili-mili-force" as today's symbols would say. )
.005 would generally refer to µF, or 5nF, or 5,000pF.
<Schematic finally downloaded> Ah, that is weird... huh. Maybe they did mean "mili-mili" for some strange reason.
Nah that can't be, cuz they have "mfd" there as well...
Tim
Attachments
That's weird. As you say, mm usually meant micro-micro, but there's just no way you can make a 0.005mmF, or 5fF capacitor - 5pF tends to be +/- 0.5pF. On the other hand, three typos are odd too. Perhaps comparing the component's value with other circuits of that era will solve the problem...
Both links with schematics and pictures should reveal the answer.
http://home.earthlink.net/~eico_hf81/eico_hft90.htm
http://home.earthlink.net/~eico_hf81/links.htm
IMHO 0.005mmf is 5pF
Greetings
/Hugo
http://home.earthlink.net/~eico_hf81/eico_hft90.htm
http://home.earthlink.net/~eico_hf81/links.htm
IMHO 0.005mmf is 5pF
Greetings
/Hugo
http://www.hw.cz/constrc/lc_metr/
I made it and will never regret. Cheap (20$)and accurate to about 0.5 uF, L-meter works flawlessly.
I made it and will never regret. Cheap (20$)and accurate to about 0.5 uF, L-meter works flawlessly.
Re: capacitance meter
Not quite plans, but I believe that a Blumlein Bridge can easily do what you need with great accuracy. UK Patent No 323,037 "Alternating Current Bridge Circuits" 13 September 1928 A D Blumlein.
ghettorigged said:Anyone have plans for a capacitor meter down to 1pf?
Not quite plans, but I believe that a Blumlein Bridge can easily do what you need with great accuracy. UK Patent No 323,037 "Alternating Current Bridge Circuits" 13 September 1928 A D Blumlein.
Re: Re: capacitance meter
Any link to that patent?
/Hugo
EC8010 said:
UK Patent No 323,037
Any link to that patent?
/Hugo
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