[NSRCA-discussion] JR and un-regulated 6V

[Jay Marshall]

As my boss once told me, don't confuse precision with accuracy and
repeatability. Just because a spreadsheet calculation shows 14 digits
doesn't mean that it is accurate. Accuracy only happens when calibrated
against a standard; repeatability is a little easier to measure.
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bob Richards
Sent: Friday, June 16, 2006 11:59 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] JR and un-regulated 6V
 
John,
 
For some things, I like analog. For fluctuating signals, a needle is good.
Some digital meters have an analog bargraph for that reason.  My Fluke has
that, as well as a min/max function which is handy. However, you can't get
3+ digits precision with a needle. :-) I need that for checking Lipo cells
to make sure they are balanced before/after charge.
 
I like analog tachometers, I still have a really old Royal tach that I built
from a kit back in the 70s. Still resides in my field box.
 
Bob R.


John Ferrell <johnferrell at earthlink.net> wrote:
I find an analog meter more useful than a digital. Any drift while reading
is obvious. Also, when you watch the meter and it looks like the voltage is
going up, the resistor wattage is low, it is getting warm and changing
value. 
 
I use a cheap Hobbico analog ESV with short, permanent leads. It lives in my
radio case. I use it before every flight. I try to use it after every flight
as well...
 
John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US <http://dixienc.us/> 
 
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