Schwarzbeck SHUNT 9571 High Power Shunt Resistor

The SHUNT 9571 is a measuring resistor which can be used in systems where magnetic fields have to be generated. When connected in series between an amplifier and a Helmholtz coil, the current can be measured indirectly. The voltage drop is proportional to the current through the coil.

The low inductive construction allows to use the SHUNT 9571 up to 250 kHz. Individual correction values for |Z| are provided in the calibration certificate from DC to 250 kHz.

Helmholtz coils act like a short circuit at low frequencies. The SHUNT 9571 provides a protection circuit for the amplifier and has a resistive minimum load.

The Shunt 9571 consists of two independent resistor banks of 0.5 ? which can dissipate 400 W of power each. The resistance values of 1.0 ? and 0.25 ? can be achieved using the two aluminum brackets included in delivery.

The fans get activated automatically when high temperatures occur. When the shunt is overheated an acoustic warning signal rings out and a red light emitting diode at the front panel illuminates. The load has to be reduced or turned off and the shunt has to cool down while the fans are in operation. Do not remove the power cable while fans are running!

Operation:

Before putting the SHUNT 9571 into operation you must adjust the voltage selector switch for the mains power to the correct value (110V/220V)! This is necessary due to the fact that the shunt needs active cooling.

The voltage selector combined with the fuse holder at the rear panel has to be set to the local mains voltage. Remove the holder box with the yellow mains voltage field by pushing the lever. Insert the correct fuses (1A). Insert the holder box in the correct orientation for the mains voltage (110V / 220V).

Typical impedance of the shunt 9571

Frequency [MHz]