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85 kHz consists of a high current/...
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The compensation network NFCN 9732 85 kHz consists of a high current/ high voltage variable capacitor.
The compensation capacitor reduces the total impedance of the series circuitry consisting of the Helmholtz coil HHS 5206-8 and the NFCN 9732 85 kHz at the operating frequency band of 80-90 kHz. It allows continuous currents of up to 15 Arms at generator voltages of less than 40 Vrms.
You can choose from 11 different capacitance values with a rotary switch in 1 kHz steps from 80 kHz to 90 kHz. When using test frequencies that are between the given frequencies use a position that is closest to the needed frequency.
A capacitance of 15.7 nF is hard wired to the 4 mm safety laboratory connectors. The variable capacitor part gets added to the total capacitance value by using relays.
Fig. 2 View of the Connectors for the Capacitor
Fig. 3 Power Switch and IEC Connector
First steps with the overall system:
To set up the whole test system the following components are required:
Setting up the system:
Raise the output voltage of the function generator until the right current flows. Because the components heat up during operation the current has to be re-adjusted when necessary.
Important!
Switching capacitors is only allowed when no signal is connected to the NFCN. Otherwise the operational life span of the relays gets reduced dramatically.
Hazard warning:
Attention: During operation the voltages at HHS 5206-8 and at NFCN 9732 85 kHz will be much higher than at the amplifier output. When used inappropriate there will be danger to life!
Do not touch the terminals during operation. Switch off the complete system before touching any connections.
Only trained personnel may use this device.
Fig.4. Measurement setup of the overall system
Fig. 5 Typical setup of the test system IMMSYS 85 kHz,
consisting of function generator, power amplifier LFPA 9733,
compensation network NFCN 9732 85 kHz,
Helmholtz coil HHS 5206-8, SHUNT 9571 and voltmeter.