Re: Impedance Measurement
jasen wrote:
On 2007-03-30, Pete M <pete@xxxxxxxx> wrote:
I would like to measure the resistance (impedance) of a soldering iron tip
to ground with power on - When I use a standard ohm meter I am getting
fictitous readings.
With no power I get a 1 ohm (typcical)dc resistance. When I power I get
readings all over the place. Any suggestions on a circuit?
try it with an moving-coil meter.
Bye.
Jasen
Why would that make any valid difference? In fact, it would make it
harder to get a valid reading.
I used a Data Precision digital meter on my bench for four years. If
any of the hot soldering irons hadn't been used in 15 minutes or more,
the hot tip was touched to a scrap of copper clad PC board, with a drop
of solder. If they read under three ohms, I used it. if not, I cleaned
it and retested. I also tested and calibrated every soldering iron in
the company a couple times, after one of the MEs died of a Brain
Aneurysm.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
.
Relevant Pages
- Re: Power usage
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(uk.comp.homebuilt) - Re: Impedance Measurement
... With no power I get a 1 ohm dc resistance. ... readings all over the place. ...
(sci.electronics.basics) - Re: Re: Re: After 6 years of meter readings, electric company I says I owe £50,000
... your consumption is easy to check by simply taking readings at the same time ... If you have access to the incoming live and neutral cables, and these are separate, you can get a good idea how much power you are using at any time by using a clamp-on ammeter to measure the incoming current. ... This does not interfere with the wiring or affect the operation of the meter. ... It showed instantaneous consumption in watts, as well as cost, and totals over days and weeks. ...
(uk.legal) - =?iso-8859-1?Q?Re:_Re:_After_6_years_of_meter_readings=2C_electric_compan?= =?iso-8859&#
... your consumption is easy to check by simply taking readings at the same time ... If you have access to the incoming live and neutral cables, and these are separate, you can get a good idea how much power you are using at any time by using a clamp-on ammeter to measure the incoming current. ... This does not interfere with the wiring or affect the operation of the meter. ... It showed instantaneous consumption in watts, as well as cost, and totals over days and weeks. ...
(uk.legal) - Re: Mythbusters: V/I ratio is forced to Z0
... Thruline section are invalid unless it has some minimum length of 50 ohm line on both sides of itself. ... I have performed a test using components at hand where the Bird 43 has ... rated power output. ... All you have just proven is that the Bird 43 gives invalid readings when it is in a 75 ohm environment. ...
(rec.radio.amateur.antenna) |
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