Mike,
Thanks, I kinda thought that myself as they probably dont really care about
holding too tight of a tolerance, I wouldnt think, on the filaments of those
bulbs.
See, I'm not sure how Simpson calibrated those. Most likely using a resistance.
If this is the case though, any capacitance or inductance added in the circuit
will throw it off. Then, the correct wattage would have to be figured from the
power factor.
What this meter does, it has a male plug, and female recepticle to plug in any
standard line cord, then measure both voltage and wattage simutaneously. My
opinion, I'll do like I started to, and hook it up to a big resistor. Bill had
mentioned using my dummy load, which I thought of too, but didn't want to have
to go to the bench. Thanks for the help.
Best,
Will
*********** REPLY SEPARATOR ***********
On 4/22/05 at 11:48 AM m.ford wrote:
>Hello Will
> I recently tested a hv xfmr using banks of 100 watt lamps
>in series as the load. I measured voltage across one lamp and
>multiplied by the number of lamps to obtain the total voltage.
>I found that depending on which lamp I measured, the readings
>varied considerably.
>
> I would not put much faith in the "100 watt" rating of a light bulb.
>
> Hope that helps,
>
> Mike Ford k1ern
>
>----- Original Message -----
>From: "Will Matney" <craxd1@ezwv.com>
>To: <amps@contesting.com>
>Sent: Friday, April 22, 2005 10:31 AM
>Subject: [Amps] Volt-watt meter
>
>
>> I have a Simpson volt-watt meter here I'm thinking about getting
>calibrated. The thing is, I'm not really sure how accurate it is.
>After I bought it, I tried it out on a lamp in the house using a 100 watt
>buld. Something didn't jive about the watt reading when I
>calculated the wattage from the line voltage shown as the meter showed a
>lower wattage. I wonder just how accurate those bulb
>ratings are? Simpson is known for good accuracy because of their meter
>movements, but I'm not too sure about this. I'd like to test
>it again before I pay a fortune for calibration on it. I thought of using
>a transformer but then your not sure what the power
>actually is due to losses. I don't have any power resistors large enough
>handy to at least get a 1/2 scale reading. What might be a
>good circuit I'm not thinking of to test this? Note; this meter is
>designed for power readings on a 120 or 240 Vac line.
>>
>> Thanks,
>>
>> Will
>>
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>
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