Solar 9207-1(B)

Direct connection to the conductor carrying EMI current is not necessary, since the probe may be opened for insertion of the conductor into the window of the toroid and then closed again to form a toroidal transformer with the conductor acting as a one-turn primary.

A correction factor graph is provided to convert measured µV to EMI µAs. When the EMI current is measured in dB above 1 µV as indicated on a conventional EMI meter, the correction factor will convert the measurement to dB above 1 µA.

The correction factor is the inverse of the transfer impedance, Zt.

Each probe is shipped with a graph of the correction factor versus frequency, keyed to the serial number on the probe.

High power RF amplifiers with 50 Ω output impedance are used to deliver voltage to the injection probe.

The wire or cable through the window of the probe acts as a secondary of the toroidal transformers.

This test method is intended to be used instead of earlier methods, such as CS-01, CS-02, and RS-02 of MIL-STD-461.

Bulk current injection probes are available in two styles:

1. Fixed window style where the wire(s) under test must be passed through the window.

2. A split toroidal design where the probe can be opened up and clamped over the wire(s) under test.

Each probe is calibrated for insertion loss and transfer impedance in a test fixture designed for the particular window size.

This fixture provides a signal path with a low Voltage Standing Wave Ratio (VSWR). A typical fixture is Solar Type 9125-1, used for probes with 32 to 44 mm diameter windows. 

Maximum PRI. (pl) current, A

400 Hz

Maximum PRI. (pl) current, A

RF (CW)

Maximum PRI. (pl) current, A

Pulse