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EMI / RFI Current & Injection Probes

Manufactured and Serviced in North Hollywood CA

CURRENT PROBES

Current probes required by various EMI specifications (such as MIL-STD-461/2) are toroidal transformers designed to measure RF currents on active power lines or other conductors.

APPLICATION

A current probe is used as a “pick-up” device for measuring RF current in single conductors or cable bundles when connected to the 50 ohm input
of a radio frequency interference measuring receiver or spectrum analyzer.

DESCRIPTION

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 microvolts to EMI microamperes. When the EMI current is measured in dB above one microvolt as indicated on a conventional EMI meter, the correction factor will convert the measurement to dB above one microampere.

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. Under certain conditions, a current probe can be used to inject low level RF signals into individual wires or cable bundles.

INJECTION PROBES

Specifications require the injection of large high frequency currents into cable bundles and individual wires, using inserted secondary toroidal transformers placed around the conductors being tested.

APPLICATION

High power RF amplifiers with 50 ohm 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.

DESCRIPTION

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. A typical fixture is Solar Type 9125-1, used for probes with 32 to 44 mm diameter windows. Ask for details on this and other test fixtures.

 

Complete Catalog

   

RFI/EMI Current and Injection Probes

 

 

CLAMP-ON INJECTION PROBES

SOLAR TYPE NO.

WINDOW DIAMETER

WINDING CURRENT

RATED WATTS

INSERTION LOSS

FREQUENCY RANGE

UNDER 6 dB

UNDER 10 dB

UNDER 15 dB

UNDER 20 dB

9108-1N

1.25" (32 mm)

10

50

 

 

120 KHz

 -

 70 MHz

60 KHz

 -

 150 MHz

10 KHz

 -

 200 MHz

9120-1N

1.25" (32 mm)

30

50

 

12 MHz

 -

600 MHz

7 MHz

 -

900 MHz

4 MHz

 -

 1GHz

4 MHz

 -

 1 GHz

9121-1N

1.25" (32 mm)

30

50

 

100 MHz

 -

550 MHz

50 MHz

 -

800 MHz

30 MHz

 -

 1GHz

10 MHz

 -

 1 GHz

9142-1N

1.50" (38 mm)

50

200

10 MHz

 -

 350 MHz

5 MHz

 -

430 MHz

2.5 MHz

 -

500 MHz

1.5 MHz

 -

500 MHz

2 MHz

 -

500 MHz

9144-1N

1.50" (38 mm)

26

100

 

200 KHz

 -

 8 MHz

70 KHz

 -

 90 MHz

40 KHz

 -

100 MHz

10 KHz

 -

100 MHz

9217-1N

1.50" (38 mm)

26

100

800 KHz

 -

 1.5 MHz

500 KHz

 -

40 MHz

250 KHz

 -

100 MHz

150 KHz

 -

100 MHz

10 KHz

 -

100 MHz

9310-1N

2.62" (67 mm)

26

100

 

15 MHz

 -

 450 MHz

800 MHz

 -

 650 MHz

4 MHz

 -

 800 MHz

5 MHz

 -

800 MHz

9607-1N

1.25" (32 mm)

10

50

 

500 KHz

 -

1 MHz

200 KHz

 -

30 MHz

120 KHz

 -

 300 MHz

10 KHz

 -

300 MHz

Injection probes can also be used as current probes. A correction factor graph and instructions for its use are supplied.

 

CALIBRATION FIXTURES

Note: Except for p/n 9125-1 and 9357-1

The probes are supported and centered in the fixture

Model

Description

9125-1

For Injection Probes, 1.5" (32 mm - 44 mm) diameter window. 20 Hz to 500 MHz. Type BNC connectors.

9125-2

For Solar 9119-1N Probe and similar, 1.25" (32 mm) diameter window. 400 MHz to 3 GHz. Type N connectors.

9251-1

For Eaton, Stoddart and Solar Probes, 1.25" (32 mm) diameter window. 20 Hz to 500 MHz. Type BNC connectors.

9254-1

For Eaton, Stoddart and Solar Probes, 2.62" (66 mm) diameter window. 20 Hz to 500 MHz. Type N connectors.

9321-1

For Eaton, Stoddart and Solar Probes, 0.75" (19 mm) diameter window, totally enclosed. 20 Hz to 1.5 GHz. Type BNC connectors.

9330-1N

For Eaton, Stoddart and Solar Probes, 1.25" (32 mm) diameter window, totally enclosed. 20 Hz = 1.0 GHz. Type N connectors.

9357-1

Clam Shell Fixture for Solar 9335-2 Probe. 20 Hz to 100 MHz. Type BNC connectors.


Last Updated: April 26, 2018
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