Re: Where are all the ESR meters?

In article <1185457708.669621.20180@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
MooseFET <kensmith@xxxxxxxxx> wrote:

On Jul 26, 1:49 am, Tony Williams wrote:

2. Don't force a handheld instrument with built-in display.

You just put a restriction on that I don't like. To connect to a
DVM we have to make a voltage that is proportional to the ESR.
This requirement would add quite a few parts to some peoples
ideas.

Yes, a point of debate. The merits of the ratiometric
facilities of a DPM versus an analogue divider.

At the back of my mind in making the remarks were several
possibilities. Having more power from an AC supply would
allow much more freedom in the design itself, including
the power to drive relays. The interesting relay could
be a 4PCO that shifted the front end connections from
a Discharge mode to the ESR Measurement mode. The relay
would come up unpowered, in the Discharge position and,
(when seen to be safe), a push button would latch the
relay over to make the input connections for Measurement.

When in Discharge mode the meter, (or external DMM/DVM),
could be switched to look at the (discharging) DC
voltage across the capacitor under test.

From that pov the analogue divider in the ESR chain
would make more sense than a ratiometric DPM.

--
Tony Williams.
.

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