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RE: Magnepan MG12 Frustration, Please Help.

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In Reply to: RE: Magnepan MG12 Frustration, Please Help. posted by neolith on September 06, 2012 at 09:32:57

In the old 'Simpson 260' days when a meter.....had a METER! we called the cap test the 'kick test' since the cap would conduct giving very low resistance than would go up as the cap charged....Big caps could take a while....I don't know about a 50mfd.

Too much is never enough

Follow Ups:

RE: Magnepan MG12 Frustration, Please Help. - neolith 18:47:43 09/06/12 (2)
The typical digital ohm-meter is a constant current device and the "meter" measures voltage which is directly proportional to the resistance. When the meter is connected across the cap, current rushes into the capacitor and the meter no longer has a constant current. However, once the capacitor reaches full charge, no current flows through it and the measurement will be stablized. The time constant of a series R-C circuit is RxC and occurs when at 63% of full charge. So the time to stablize will depend on the internal resistance of the meter. Typically at the lowest range (0-200 ohms) the resistor is about 2.7k so the time constant is 0.135 seconds. It will take 5 time constants to reach steady state so the meter should be stable in a little over a 1/2 second.

Probably more information than you wanted to know.
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- RE: Magnepan MG12 Frustration, Please Help. - pictureguy 21:17:08 09/06/12 (1)
  The 'Simpson 260 Senior VoltOhmist' was a 10,000 ohms per volt VOM. It had batteries inside...but I don't remember type or quantity.
  My first KIT meter was an Allied Radio Knight Kit called a VTVM. Yep, it had 2 tubes and a straight 11meg. input impedance. I don't think it was true RMS.
  
  The Simpson was THE meter to have for quite a while. The first shops I worked in had nothing but.
  Later? Fluke or Beckman became the norm.
  
  I'm including a link to a representative model from the line. I honestly don't remember ever going thru the battey nightmare this model must have been.
  
  I'd like to have one....with the mirrored scale and a 'taut band movement'.......
  Too much is never enough
  - http://www.simpson260.com/260-5/simpson_260-5.htm (Open in New Window)
  - RE: Magnepan MG12 Frustration, Please Help. - neolith 05:08:58 09/07/12 (0)
    My first was from Lafayette Electronics and it had a whopping 20 KOhm impedance on DC (10k on AC). It worked for about 40 years!
    �
    
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