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Technical Information 65
A
MBRELL
801-9526-00.doc
Precision Induction Heating
Errors accumulate quickly:

Scope input gains must be turned down to accommodate higher crest factors,
resulting in loss of scope resolution and accuracy.

The required use of two scope channels - with attendant differential phase and
gain errors.

The required use of differential voltage probes and current probes and their errors.
It is recommended that load power measurements be performed instead of terminal
power, using calorimeter techniques. These techniques will include the losses of coil
coupling efficiency to the load, losses in the coil, cable and heat station. While yielding a
reasonably accurate load power, the result is not intended to match the RF terminal power
that the EASYHEAT reports.
In general, when the workhead tap is optimized for the application, errors due to crest
factor are minimized and the reported EASYHEAT power output is most accurate.