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| Thread ID: 105114 | 2009-11-19 19:42:00 | Electronics help | prefect (6291) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 831650 | 2009-11-19 19:42:00 | My son has a school science project and wants a micro ammeter the plans he has from internet say its available at the radio shack. DSE dont seem to have one from their website product listing. My multimeter only does milliamps he needs microamps for current produced from human body. Does anyone know where in Auckland they can be bought Thanks for any help. |
prefect (6291) | ||
| 831651 | 2009-11-19 19:58:00 | Try Jaycar ? | bonzo29 (2348) | ||
| 831652 | 2009-11-19 20:35:00 | DSE should be trusted only for toasters. However, a cheap low range voltmeter is a passable micro-ammeter. It will have a lot more resistance than required, and calibration will be lacking, but if an indication is all that is required from a high impedance source such as the human body it will happily indicate quite small currents and indicate relative magnitude. Ohms law is your friend here. If he wishes to satisfy some curiosity as well as get the measure of these fleeting currents, try converting the cheapo meter to a mirror type; a small piece of aluminium foil attached in place of the pointer and deflecting a focussed light beam onto a distant scale. |
R2x1 (4628) | ||
| 831653 | 2009-11-19 20:39:00 | What range Rx? | prefect (6291) | ||
| 831654 | 2009-11-19 20:56:00 | Try Jaycar ? Thanks just rung them have one in Glenfield and only $11.00 thanks bonzo and rx. |
prefect (6291) | ||
| 831655 | 2009-11-19 21:25:00 | Jaycar Cat. QP-5012; 0-50 uA or Cat. QP-5020; 0-20V, 20Kohm |
R2x1 (4628) | ||
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