post your load testers!

[wdrzal]

PWM:

wdrzal the only case when that is wrong is when using an in-line energy meter as the lower supply voltage may cause incorrect readings or no readings at all.

My orginal statement in above post is never wrong, If you using a inline meter that can't read the voltages & amps or wattage on the secondary side of your transformer for any reason......Get a meter that can.

Ps: you need test equiptment you trust that stays in calibration.

[sdumper]

My orginal statement in above post is never wrong, If you using a inline meter that can't read the voltages & amps or wattage on the secondary side of your transformer for any reason......Get a meter that can.

Ps: you need test equiptment you trust that stays in calibration.

Walt can you show an example...even a simple drawing would be helpful.

[wdrzal]

Walt can you show an example...even a simple drawing would be helpful.

Scott I didn't see your question until this thread was bumped today.


If you plug your watt meter into a wall receptacle and then plug your variac (transformer) into it, your watt meter will read total current,including the inefficiency of the transformer. Since transformers are not 100% efficient and their efficiency varies ,your reading will be higher than the actual load than if you measure current between transformer & load cell.

For a higher degree of accuracy measure the current between the transformer and load tester.

Your using resistive heating cartridges ,the electricity is converted to heat @ ~99.98% efficiency, so call it 100% unless you care about a small fraction of a watt error............

You will get a much more accurate reading of actual heat being produced if you measure after transformer.