Hi,
Probably don't want to start messing with the slug calibraton.
You could drive a current sink (op-amp + JFET + 420 ohm R) with a 1400 ohm
input R to match the type 43 slug.
Something like this:
http://www.freecircuits.net/circuit-57.html
Note that operating at such low currents that the NPN booster device is not
required.
A very low offset op-amp is required. Single supply may be possible.
73 & Good morning,
Marv WC6W
http://qsl.net/wc6w/
--- On Tue, 9/6/11, vk3pa@vk3pa.com <vk3pa@vk3pa.com> wrote:
> From: vk3pa@vk3pa.com <vk3pa@vk3pa.com>
> Subject: [Amps] bird meters
> To: amps@contesting.com
> Date: Tuesday, September 6, 2011, 8:25 PM
> I have a couple of BIRD 100ua meters
> 2150-090 es 091
> if I use these on my thruline 4522-002-8 50 ohm with 43
> slugs wot
> error will I see?? as these slugs are for 30ua..meters!!
> or can I recal the slugs es if so "how"
> tu 73 vk3pa
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