raptor727
10+ year member
come get some!!
Hey guys I got a fluke 83III mm and a 87III true rms meter with clamp are these the correct meters for clamping?
Looks like those should work. To be honest, I have never tried to measure true RMS watts & calculate impedance rise, but I found a decent explanation on another forum...
"Use the True-RMS Clamp Meter on the +speaker wire only to measure your AC Amperage and use a DMM with peak-hold on to measure AC Voltage across the speaker +/- terminals.
Multiply those 2 numbers to get your RMS Wattage.
To find the Impedance rise you divide the voltage by the amperage. NOTE - impedance rise varies with frequency, so the measurement may depend somewhat on the test signal you are using. "
not always true, but most of the time. @37hz I rise to 12.16 ohms, but at 54, which is what im tuned to, I rise to 7.745 ohms, and my peak, which is 41hz, I rise to 6.394 ohms. LOLThat would be correct ^. And rise will be highest at your box tuning.
can you recommend a cheaper clamp meter?Looks like those should work. To be honest, I have never tried to measure true RMS watts & calculate impedance rise, but I found a decent explanation on another forum...
"Use the True-RMS Clamp Meter on the +speaker wire only to measure your AC Amperage and use a DMM with peak-hold on to measure AC Voltage across the speaker +/- terminals.
Multiply those 2 numbers to get your RMS Wattage.
To find the Impedance rise you divide the voltage by the amperage. NOTE - impedance rise varies with frequency, so the measurement may depend somewhat on the test signal you are using. "