# [TCML] Measuring Voltage?

Neal Namowicz neal at imagesbyneal.com
Mon May 24 22:01:36 MDT 2010

```Yeah, you know, it just seemed too easy when I first put it together. Okay,
so someone mentioned "guesstimating" the voltage, that works for someone
like myself who is math-challenged. So, ballpark figures, what might my
secondary output voltage be from a 4" coil, 9kv power supply? The streamers
run about 25 to 30". Also, how would that change for a bi-pole coil with a
secondary gap of only a few inches?
I ask these questions partly for my own curiosity, but also when people see
my stuff in operation, I can give a fairly decent answer to when they ask,
how much voltage IS that?

Neal N.

] Measuring Voltage?

> Voltmeters off X ray machines are NOT rated to the voltage indicated on
> the scale. They are a low voltage meter that is fed from a voltage divider
> circuit.
> You can apply low voltage DC and determine what the actual rating of the
> meter is and also the resistance and then make a voltage divider to hazard
> to the meter itself.
> >
> >
> At 08:52 AM 5/23/2010 -0500, you wrote:
>>I wanted to ask if whether or not the primary, or secondary, voltages can
>>be measured with a meter. Here's what I did, and I don't know if my meter
>>is that far off, or if there is something else affecting the readings that
>>I'm not aware of. I have an old KV meter from an x-ray machine with a
>>range of 40kv to 140kv dc. I attached a couple hv diodes to the meter and
>>attached it to the secondary electrodes on a bi-pole coil. The needle was
>>pegged almost immediately when I started to apply power. Then I switched
>>it over to the output on the transformer (9kv, 30ma nst).  With the variac
>>.com/mailman/listinfo/tesla

```