Re: Sprain Mag Motor

[hohlrauml6d]

I'll be going back soon with a better ELECTRICAL Engr.  While my degree 
is in EE, I have been in photonics so long I don't trust my 
oscilloscope capabilities any more -- especially these new-fangled, 
digital storage, self normalizing, display maximizing types.  Now give 
me an Optical Time Domain Reflectometer and I'll find your Course 
Wavelength Division Multiplexing problems at the speed of light in 
glass. <g>

Regards,

Terry

-----Original Message-----
From: jonfli <[EMAIL PROTECTED]>
To: vortex-l@eskimo.com
Sent: Mon, 27 Feb 2006 13:41:10 -0800
Subject: Re: Sprain Mag Motor

Terry, 
 
Yes, thank you. However, the CH2 Mean measurement of 71.3mv isn't 
accurate because it appears to be > 200mv! I assume the probe was set 
at 0-10A with an output of 10mv/Amp, this makes the input current 
measurement on CH2 to be > 2A Mean. 
 
The CH1 voltage measurement seems to indicate the coil is driven from a 
positive supply thru a P-Channel FET or equiv and the power supply 
voltage is ~20Vdc judging from the CH1 vertical cal at 4.52v/div!? 
 
The pulse width measurements are different between CH1 and CH2 so, 
taking the longer CH1 duration of 27.5ms, these measurements yield > 
1.1J/pulse which is somewhat close to your calcs. 
 
One thing that bothers me a little is the increase in saturation 
voltage of the assumed P-Channel FET at the relative low current of ~ 
2A so they must be using a small die area device. This could certainly 
be improved upon. 
 
Jon F 
 
-----Original Message----- 
From: jonfli 
 
Just curious as to the calibration/div for the current probe used on 
Ch2 to arrive at your energy calc above? 
 
<><><><><><><><> 
 
See the post to George on the probe specs. Does that answer your 
question? 
 
Terry 
 


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