EMCO/ETS-Lindgren 7405 E/H Near Field Probes

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ETS-Lindgren (EMCO) 7405
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7405 Datasheet Accessory Kit

The EMCO / ETS-Lindgren 7405 E/H Near Field Probes are a passive, near field probe set designed as a diagnostic aid for locating and characterizing sources of E and H Field emissions. The set consists of three loop probes, one stub and one ball probe, an extension handle, an optional battery-powered preamplifier, and a foam-lined carrying case with a manual and application note.

The handle of each probe terminates in a BNC connector. Probes are designed to be used with a signal analyzing device such as an oscilloscope or spectrum analyzer. The optional preamplifier is useful when signal amplification is necessary for the analyzing device.

The loop probes are H-Field selective and directional. Sensitivity is relative to loop diameter. For example, the 6 cm loop can be used to make a general survey for H-Field emissions, while the smaller diameter loops can isolate specific sources.The ball and stub probes are E-Field selective and omni-directional. The stub probe is designed for precise E-Field source location, such as signal traces or IC pins. The ball probe has a large sensing element and is capable of locating weaker signals.

Typical applications include locating and characterizing emissions from PCBs, ICs, etch runs, cables, cover seams, etc.
ETS-Lindgren (EMCO) 7405 Features
  • Broadband Frequency Range
  • Linear Response
  • Locates both E and H Field
  • Emissions Sources
  • Specialized Sizes / Shapes for Sensitivity
  • Includes Free Carrying Case
  • New Optional Preamplifier for Signal Amplification
ETS-Lindgren (EMCO) 7405 Specs
Electrical Characteristics of Probes
Model 7405 Probe Type Primary Sensor E/H Or H/E
Upper Resonant
901B 6.0 cm Loop H-Field 41 dB 790.0 MHz
902B 3.0 cm Loop H-Field 29 dB 1.5 GHz
903B 1.0 cm Loop H-Field 11 dB 2.3 GHz
904B 3.6 cm Ball E-Field 30 dB > 1.0 GHz
905B 6.0 mm Stub Tip E-Field 30 dB > 3.0 GHz
Nominal Gain of Optional Preamplifier
Frequency Gain
100 kHz 35.5 dB
1 MHz 38.1 dB
100 MHz 37.2 dB
1 GHz 32.5 dB
2 GHz 25.0 dB
3 GHz 13.0 dB
Electrical Characteristics of Optional Preamplifier
Model 7405 Bandwidth Noise Figure
(@ 100 MHz freq)
Saturated Output Power
(@ 100 MHz freq)
1db Gain Compression Intercept Connector
907B 100 kHz3 GHz 3.5 dB (typical) +12.0 dBm (typical) +10.0 dBm TYPE BNC
907BN 100 kHz - 3 GHz 3.5 dB (typical) +12.0 dBm (typical) +10.0 dBm Type N