[Amps] Manganin wire

[MIKE DURKIN]

Ok .. i feel silly now .. i found the problem ... found a diode not in the schematic next to a opamp that was/is supposed to be for external metering that was shorted to ground. (no i was still using the internal) -- replaced and my GS-35b is running 200ma with a 31V bias .. id say that's about right wouldnt you??

Mike
KC7NOA

> Date: Mon, 1 Mar 2010 10:47:14 -0500
> From: 
> CC: amps at contesting.com
> Subject: Re: [Amps] Manganin wire
> 
> Hello All,
> Forgive me if this has already been said.
> 
> The resistance of manganin wire is extremely stable with respect to 
> temperature and this is why it is so useful as a meter shunt.  An 
> ammeter is nothing more than a voltmeter that measures the voltage drop 
> across a meter shunt.  The resistance of the shunt and the meter scale 
> determine the range of the ammeter.  There is no reason to use manganin 
> wire to connect the power supply to the meter unless the designer is 
> using this connection AS the meter shunt.  Just because the meter scale 
> reads amps, doesn't mean that there is a shunt internal to the meter. 
> Good luck & 73, Tim, W2UI
 		 	   		  
_________________________________________________________________
Hotmail: Trusted email with Microsoft’s powerful SPAM protection.
http://clk.atdmt.com/GBL/go/201469226/direct/01/