In the usual realization of the Hall multiplier (0.1% up to a few megahertz), shown in Figure 3.12(a), the magnetic induction is proportional to the load current and the optimal polarizing current iv is set by the resistor Rv.
For the frequency range up to megahertz, an alternative arrangement is shown in Figure 3.12(b), in which the load current IL flows directly into the Hall device, acting as a polarizing current, and the magnetic field is generated by the voltage v.
In this same way, the temperature influence is reduced for line-frequency applications with constant-amplitude voltages and variable load currents.
In the megahertz to gigahertz range, standard wattmeters use probes in waveguides with rectifiers.