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5 microamp meter - 5 microamp d'Arsonval.jpg
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5 microamp meter - 5 microamp d'Arsonval.jpg
In message , John Fields
writes [ A UUEncoded file (5 microamp d'Arsonval.jpg) was included here. ] Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? -- Ian |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
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On Tue, 17 Nov 2009 19:15:38 +0000, Ian Jackson
wrote: In message , John Fields writes [ A UUEncoded file (5 microamp d'Arsonval.jpg) was included here. ] Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? --- It's real. :-) JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
In message , John Fields
writes On Tue, 17 Nov 2009 19:15:38 +0000, Ian Jackson wrote: In message , John Fields writes [ A UUEncoded file (5 microamp d'Arsonval.jpg) was included here. ] Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? --- It's real. :-) JF [ A UUEncoded file (meter box.jpg) was included here. ] Go on! I'll bet it's not! I thought that the best you got was something like 50uA. If it really IS 5uA, take care not to drop it. I've got one or two meters which 'lie' the other way. They are reasonably sensitive but are intended to be used with a shunt, and are scaled for an FSD higher than their basic sensitivity. -- Ian |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"Ian Jackson" wrote in message ... In message , John Fields writes On Tue, 17 Nov 2009 19:15:38 +0000, Ian Jackson wrote: In message , John Fields writes [ A UUEncoded file (5 microamp d'Arsonval.jpg) was included here. ] Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? --- It's real. :-) JF [ A UUEncoded file (meter box.jpg) was included here. ] Go on! I'll bet it's not! I thought that the best you got was something like 50uA. If it really IS 5uA, take care not to drop it. I've got one or two meters which 'lie' the other way. They are reasonably sensitive but are intended to be used with a shunt, and are scaled for an FSD higher than their basic sensitivity. -- Ian Wasn't the Avo 8 movement built for 37.5 uA FSD, or thereabouts, certainly less than 50, and that had a big needle. I vaguely recall GWM Radio or J. Bull Electrical selling the bare movements. On that basis a 20 or perhaps even 10 uA movement might be conceivable, although 5 seems a bit of a stretch. Chris |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg - meter test 008.jpg
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On Tue, 17 Nov 2009 20:30:42 +0000, Ian Jackson
wrote: In message , John Fields writes On Tue, 17 Nov 2009 19:15:38 +0000, Ian Jackson wrote: In message , John Fields writes [ A UUEncoded file (5 microamp d'Arsonval.jpg) was included here. ] Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? --- It's real. :-) JF [ A UUEncoded file (meter box.jpg) was included here. ] Go on! I'll bet it's not! --- Don't bet too much. ;) The resistor on the right is a 1 megohm 1% RN55, the Fluke's on the 200”A FS range and I've even given you a peek at the back of the meter so you can see nothing sneaky's going on there. Well, almost... The lighting isn't all that great. --- I thought that the best you got was something like 50uA. If it really IS 5uA, take care not to drop it. --- Or even handle it roughly without a short across the terminals --- I've got one or two meters which 'lie' the other way. They are reasonably sensitive but are intended to be used with a shunt, and are scaled for an FSD higher than their basic sensitivity. --- Entirely practical. JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
John Fields ...
Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, AKA how much uWatt does it need? And how does that compare against 'normal' instruments? I noticed that e.g. the same type of relay always need the same coil power regardless the voltage. AdM |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
John Fields ...
Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, AKA how much uWatt does it need? And how does that compare against 'normal' instruments? I noticed that e.g. the same type of relay always need the same coil power regardless the voltage. AdM |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
John Fields ...
Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, AKA how much uWatt does it need? And how does that compare against 'normal' instruments? I noticed that e.g. the same type of relay always need the same coil power regardless the voltage. AdM |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
John Fields ...
Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, AKA how much uWatt does it need? And how does that compare against 'normal' instruments? I noticed that e.g. the same type of relay always need the same coil power regardless the voltage. AdM |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Thu, 19 Nov 2009 18:53:02 +0100, "Arie de Muynck"
wrote: John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. --- And how does that compare against 'normal' instruments? --- Dunno, but check out the Simpson, Tripplett, etc. websites to find out. --- I noticed that e.g. the same type of relay always need the same coil power regardless the voltage. --- OK... JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... AdM. |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... AdM. |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck"
wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... --- Aarghhh!!! Right, thanks. :-) JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
In message , John Fields
writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... --- Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! -- Ian |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
In message , John Fields
writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... --- Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! -- Ian |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Fri, 20 Nov 2009 13:53:46 +0000, Ian Jackson
wrote: In message , John Fields writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... --- Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! --- Not quite, but if I hook up a test lead with steel alligator clips to one terminal and one with copper clips to the other, I can wet my fingers and squeeze the unconnected terminals and get about 2”A into the meter. JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"John Fields" wrote in message ... On Fri, 20 Nov 2009 13:53:46 +0000, Ian Jackson wrote: In message , John Fields writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! --- Not quite, but if I hook up a test lead with steel alligator clips to one terminal and one with copper clips to the other, I can wet my fingers and squeeze the unconnected terminals and get about 2”A into the meter. JF Dare we ask to see this? ;-))))) Bill Garber |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"Ian Jackson" wrote in message
... You can probably make the needle move simply by staring hard at it! I have one which is 1mA FS, but it's only 70 ohms. It's sensitive enough that rubbing my finger across the faceplate generates enough static to bounce the needle everywhere. The scale is calibrated for a type K thermocouple, IIRC. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"Ian Jackson" wrote in message
... You can probably make the needle move simply by staring hard at it! I have one which is 1mA FS, but it's only 70 ohms. It's sensitive enough that rubbing my finger across the faceplate generates enough static to bounce the needle everywhere. The scale is calibrated for a type K thermocouple, IIRC. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
In message , Tim Williams
writes "Ian Jackson" wrote in message ... You can probably make the needle move simply by staring hard at it! I have one which is 1mA FS, but it's only 70 ohms. It's sensitive enough that rubbing my finger across the faceplate generates enough static to bounce the needle everywhere. The scale is calibrated for a type K thermocouple, IIRC. But that's not 'sensitivity' (in the sense of sensitivity to current). I have a large 'edge-scale' meter (from a German WW2 aircraft). The scale is about 6" long. I managed to break the 'bay window' shaped glass, and replaced it with one made from plastic (thin perspex, I think). It really IS static-sensitive. A gentle rub on the face of the plastic, and the needle gets well and truly pinned at any reading you want. It will stay there for hours. Like this, the meter is essentially useless. A quick 'harr' on the face releases it. -- Ian |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
In message , Tim Williams
writes "Ian Jackson" wrote in message ... You can probably make the needle move simply by staring hard at it! I have one which is 1mA FS, but it's only 70 ohms. It's sensitive enough that rubbing my finger across the faceplate generates enough static to bounce the needle everywhere. The scale is calibrated for a type K thermocouple, IIRC. But that's not 'sensitivity' (in the sense of sensitivity to current). I have a large 'edge-scale' meter (from a German WW2 aircraft). The scale is about 6" long. I managed to break the 'bay window' shaped glass, and replaced it with one made from plastic (thin perspex, I think). It really IS static-sensitive. A gentle rub on the face of the plastic, and the needle gets well and truly pinned at any reading you want. It will stay there for hours. Like this, the meter is essentially useless. A quick 'harr' on the face releases it. -- Ian |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Fri, 20 Nov 2009 10:07:58 -0500, "Bill Garber"
wrote: "John Fields" wrote in message ... On Fri, 20 Nov 2009 13:53:46 +0000, Ian Jackson wrote: In message , John Fields writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! --- Not quite, but if I hook up a test lead with steel alligator clips to one terminal and one with copper clips to the other, I can wet my fingers and squeeze the unconnected terminals and get about 2”A into the meter. JF Dare we ask to see this? ;-))))) --- Sure! I've been wanting to make a little video anyway, and this seems like a perfect opportunity, so I'll post it here in a day or so... JF |
5 microamp meter - 5 microamp d'Arsonval.jpg
On Tue, 17 Nov 2009 12:39:21 -0600, John Fields
wrote: Foolish me, i seem to remember that moving needle meters at 10 uA full scale and below are normally taut band movements. It eliminates friction issues. Be interesting if it is true. |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Thu, 19 Nov 2009 13:02:30 -0600, John Fields
wrote: On Thu, 19 Nov 2009 18:53:02 +0100, "Arie de Muynck" wrote: John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. --- And how does that compare against 'normal' instruments? --- Dunno, but check out the Simpson, Tripplett, etc. websites to find out. --- That is pretty typical of the sensitive movements that i have been close enough to touch. A hand full or so, not all that many. Then again, they never were all that common. I noticed that e.g. the same type of relay always need the same coil power regardless the voltage. --- OK... JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Thu, 19 Nov 2009 13:02:30 -0600, John Fields
wrote: On Thu, 19 Nov 2009 18:53:02 +0100, "Arie de Muynck" wrote: John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. --- And how does that compare against 'normal' instruments? --- Dunno, but check out the Simpson, Tripplett, etc. websites to find out. --- That is pretty typical of the sensitive movements that i have been close enough to touch. A hand full or so, not all that many. Then again, they never were all that common. I noticed that e.g. the same type of relay always need the same coil power regardless the voltage. --- OK... JF |
5 microamp meter - 5 microamp d'Arsonval.jpg
On Fri, 20 Nov 2009 20:16:57 -0800,
wrote: On Tue, 17 Nov 2009 12:39:21 -0600, John Fields wrote: Foolish me, i seem to remember that moving needle meters at 10 uA full scale and below are normally taut band movements. It eliminates friction issues. Be interesting if it is true. --- Your point being??? JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Fri, 20 Nov 2009 06:50:58 -0600, John Fields
wrote: On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... --- Aarghhh!!! Right, thanks. :-) JF A 200Kohms per volt meter movement. Less loading than a typical DVM above 50V. I have a similarly sensitive movement stuck in a crude semiconductor tester constructed in the 70's (base and leakage current measurement circuit). It was a cost/availability decision at the time, but using a proper supply and op amps would probably have paid off better, in the long run. Funny to recall how often a polarity reversal was needed to get a reading (opposing my naive initial expectations). RL |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Fri, 20 Nov 2009 14:26:29 -0600, John Fields
wrote: On Fri, 20 Nov 2009 10:07:58 -0500, "Bill Garber" wrote: "John Fields" wrote in message ... On Fri, 20 Nov 2009 13:53:46 +0000, Ian Jackson wrote: In message , John Fields writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! --- Not quite, but if I hook up a test lead with steel alligator clips to one terminal and one with copper clips to the other, I can wet my fingers and squeeze the unconnected terminals and get about 2”A into the meter. JF Dare we ask to see this? ;-))))) --- Sure! I've been wanting to make a little video anyway, and this seems like a perfect opportunity, so I'll post it here in a day or so... --- Well, I made the video, but it turned out to be 200MB so I can't post it here through Giganews. :-( Looks like I'll have to learn how to do it on YouTube... JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Fri, 20 Nov 2009 14:26:29 -0600, John Fields
wrote: On Fri, 20 Nov 2009 10:07:58 -0500, "Bill Garber" wrote: "John Fields" wrote in message ... On Fri, 20 Nov 2009 13:53:46 +0000, Ian Jackson wrote: In message , John Fields writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! --- Not quite, but if I hook up a test lead with steel alligator clips to one terminal and one with copper clips to the other, I can wet my fingers and squeeze the unconnected terminals and get about 2”A into the meter. JF Dare we ask to see this? ;-))))) --- Sure! I've been wanting to make a little video anyway, and this seems like a perfect opportunity, so I'll post it here in a day or so... --- Well, I made the video, but it turned out to be 200MB so I can't post it here through Giganews. :-( Looks like I'll have to learn how to do it on YouTube... JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Tue, 24 Nov 2009 14:46:01 -0600, John Fields
wrote: On Fri, 20 Nov 2009 14:26:29 -0600, John Fields wrote: On Fri, 20 Nov 2009 10:07:58 -0500, "Bill Garber" wrote: "John Fields" wrote in message ... On Fri, 20 Nov 2009 13:53:46 +0000, Ian Jackson wrote: In message , John Fields writes On Thu, 19 Nov 2009 20:21:53 +0100, "Arie de Muynck" wrote: "John Fields" Arie de Muynck... John Fields ... Ian Jackson ... Is that really a 5 microamp meter, or actually just a meter with a 5 microamp FSD scale? It's real. :-) And a real beauty it is. What is the internal resistance, --- Can't find the spec but, measured here, about 6000 ohms. --- AKA how much uWatt does it need? --- Since P = IČR = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection. Uh? P = IČR = (5e-6A)^2 * 6e3R = 150 nW full-scale. How about energy efficient... Aarghhh!!! Right, thanks. :-) JF You can probably make the needle move simply by staring hard at it! --- Not quite, but if I hook up a test lead with steel alligator clips to one terminal and one with copper clips to the other, I can wet my fingers and squeeze the unconnected terminals and get about 2”A into the meter. JF Dare we ask to see this? ;-))))) --- Sure! I've been wanting to make a little video anyway, and this seems like a perfect opportunity, so I'll post it here in a day or so... --- Well, I made the video, but it turned out to be 200MB so I can't post it here through Giganews. :-( Looks like I'll have to learn how to do it on YouTube... --- That was easy! :-) http://www.youtube.com/watch?v=ixlqM4Gx4IM JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"John Fields" wrote in message
... http://www.youtube.com/watch?v=ixlqM4Gx4IM Nice John... 21 views and climbing! :-) |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Tue, 24 Nov 2009 16:45:34 -0600, the renowned John Fields
wrote: --- That was easy! :-) http://www.youtube.com/watch?v=ixlqM4Gx4IM JF Cool, what's that rattling in the background that sounds vaguely like telephone pulse dialing? Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
"Spehro Pefhany" wrote in message ... On Tue, 24 Nov 2009 16:45:34 -0600, the renowned John Fields wrote: That was easy! :-) http://www.youtube.com/watch?v=ixlqM4Gx4IM JF Cool, what's that rattling in the background that sounds vaguely like telephone pulse dialing? I was going to be more direct and ask why we can't see what he is doing off-screen. I assume that he is building up the charge, but we can't see how. Bill Garber |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Tue, 24 Nov 2009 19:15:12 -0500, Spehro Pefhany wrote: On Tue, 24 Nov 2009 16:45:34 -0600, the renowned John Fields wrote: --- That was easy! :-) http://www.youtube.com/watch?v=ixlqM4Gx4IM JF Cool, what's that rattling in the background that sounds vaguely like telephone pulse dialing? --- Believe it or not, my hard drive! JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Tue, 24 Nov 2009 20:44:31 -0500, "Bill Garber"
wrote: "Spehro Pefhany" wrote in message ... On Tue, 24 Nov 2009 16:45:34 -0600, the renowned John Fields wrote: That was easy! :-) http://www.youtube.com/watch?v=ixlqM4Gx4IM JF Cool, what's that rattling in the background that sounds vaguely like telephone pulse dialing? I was going to be more direct and ask why we can't see what he is doing off-screen. I assume that he is building up the charge, but we can't see how. --- Why not try it for yourself? All you need is a cheap DMM, a penny and a dime, say, and a little spit... JF |
5 microamp meter - 5 microamp d'Arsonval.jpg - meter box.jpg
On Tue, 24 Nov 2009 15:59:47 -0800, "Joel Koltner"
wrote: "John Fields" wrote in message .. . http://www.youtube.com/watch?v=ixlqM4Gx4IM Nice John... 21 views and climbing! :-) --- Ahhh... Fame! ;) Thanks. :-) JF |
5 microamp meter - 5 microamp d'Arsonval.jpg
On Sat, 21 Nov 2009 06:09:20 -0600, John Fields wrote:
On Fri, 20 Nov 2009 20:16:57 -0800, wrote: On Tue, 17 Nov 2009 12:39:21 -0600, John Fields wrote: Foolish me, i seem to remember that moving needle meters at 10 uA full scale and below are normally taut band movements. It eliminates friction issues. Be interesting if it is true. --- Your point being??? JF D'Arsonval movements are jewel pivot bearings. Friction and stiction. |
5 microamp meter - 5 microamp d'Arsonval.jpg
On Sun, 13 Dec 2009 13:16:38 -0800,
wrote: On Sat, 21 Nov 2009 06:09:20 -0600, John Fields wrote: On Fri, 20 Nov 2009 20:16:57 -0800, wrote: On Tue, 17 Nov 2009 12:39:21 -0600, John Fields wrote: Foolish me, i seem to remember that moving needle meters at 10 uA full scale and below are normally taut band movements. It eliminates friction issues. Be interesting if it is true. --- Your point being??? JF D'Arsonval movements are jewel pivot bearings. Friction and stiction. They are just actually defined by the moving coil, the actual suspension can be jewel bearings, or taut band. Peter |
Hello John
Do you still have this meter and if so, would you be prepared to part with it ? We need a 0-5uA FSD meter for an energy harvesting application. Very many thanks, Richard |
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