NFCN 9731-100 – Compensation Network
The primary function of the compensation network NFCN 9731-100 is to provide serial compensation of the inductance of, for example, the HHS 5230-100 at operating frequencies of 16.666 Hz, 50 Hz, 60 Hz, 150 Hz, and 180 Hz. These operating frequencies are stipulated by SAE J551-17 (Vehicle Electromagnetic Immunity – Power Line Magnetic Fields).
The NFCN 9731-100 provides two separate channels utilizing a shared control unit. Thus, each coil of the Helmholtz coil is powered by a separate amplifier. The current flowing through the coils can be monitored using the built-in RMS ammeters.
The compensation capacitor reduces the overall impedance of the series circuit consisting of the Helmholtz coil HHS 5230 and the compensation network NFCN 9731-100 at the applied operating frequency and allows currents up to 8 Arms at a generator voltage of less than 60 Vrms.
An overvoltage protection circuit connects a damping resistor in parallel to the capacitor when the maximum operating voltage is exceeded (at currents higher than 8 Arms).
Technical data when used with HHS 5230-100:
| Max. current: | 8 A |
| Dimensions: | 448 mm x 470 mm x 191 mm |
| Frequency range: | DC – 180 Hz |
| Resistance (100°C): | < 7.5 Ohm |
| Weight: | 15.8 kg |
