HP 84125 Series Microwave EMI Measurement Systems

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To help electronic equipment manufacturers save time by eliminating the need to piece together and characterize components required for testing electromagnetic interference (EMI) at microwave frequencies, Hewlett-Packard has produced the industry's first fully configured and characterized systems for accurately measuring EMI in the 1 GHz to 40 GHz range from intentional and unintentional radiators. Each system is fully integrated and calibrated for testing products to rigorous U.S. Federal Communications Commission (FCC) regulations and proposed European EMI standards above 1 GHz.

Microwave EMI regulations affect a wide range of wireless networks products including cordless telephones, pagers, security monitors, spread spectrum transceivers, computers, and Fibre Channel LAN products. Electronic device manufacturers, EMC test laboratories and regulatory authorities will find these systems a valuable addition to existing EMI test capabilities.

The HP 84125 series microwave EMI measurement systems have the frequency range and sensitivity to meet your needs today and in the future. The systems include an EMC analyzer or spectrum analyzer, antennas, amplifiers, and a set of high-pass filters that prevent overload by reducing the level of the fundamental at the analyzer input. The cart-mounted equipment is connected to a microwave test set with a three-meter harness containing low-loss cable to maximize system sensitivity. The functionality of the HP 8593EM analyzers (for the HP 85125A and 84125B systems), the HP 8564E analyzer (for the HP 84125C systems), and the microwave test set is combined using a system downloadable program (DLP). The system DLP provides softkeys on the analyzer display that allow easy setup of measurement parameters. The displayed data is corrected for antenna, cable and filter losses, and amplifier gains, allowing direct viewing of emission field strengths (in dBµV/m).


This product family includes


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Test System Specifications:


Model              Frequency        Displayed Average          Third Order 
                   Range (GHz)      Noise Level (dBµV)1        Intercept (dBµV)
                                    Specified   Typical        Characteristic
-------------------------------------------------------------------------
HP 84125A          1 to 18          8            -1            >45
HP 84125B          1 to 26.5	    15            5
HP 84125C	   1 to 40          6            -3            >50
                   
Test Set Specifications (amplifier, filter and cable assembly):
Calibration Data Uncertainty:       ±0.9 dB
Flatness Uncertainty:               ±1.7 dB, typical
Test Set Repeatability:             ±0.7 dB2, typical
Maximum Temperature Drift:          ±1.5 dB3, typical
Input VSWR
     1 to 18 GHz:                   3.2:1, typical
     18 to 40 GHz:                  2.3:1, typical

1Specified noise levels are worst-case over respective frequency ranges 
and are measured in a 1 MHz bandwidth.

2Test set repeatability includes cable flexure, amplifier aging and 
connector repeatability.

3System specifications apply between the ambient temperatures of 
20 °C to 30 °C.




Test System Antenna and Filter Specifications:

Horn Antenna Specifications:

     Frequency        Antenna Factor(Typical)4        VSWR
     Range            Range            Uncertainty    (Typical)
     (GHz)            (dB/m)           (±dB)           
     1 to 18          24 to 47         2.0            2.8:1
     18 to 26.5       40 to 41         0.5            1.4:1
     26.5 to 40       43 to 44         0.5	      1.4:1

4Antenna factors are specified at a one-meter distance.

Filter Specifications
     Frequency        Passband        60 dB           Passband
     Range            (GHz)           Rejection       VSWR
     (GHz)                            (GHz)           (Typical)
     1 to 18          1.5 to 18       <=0.95          2.1:1
     1 to 18          3.52 to 18      <=2.5           2.1:1
     1 to 18          8.2 to 18       <=5.9	      2.3:1

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HP 84125 Series Microwave EMI Measurement System, Product Overview ( PDF)

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HP 84125      Series Microwave EMI Measurement Systems
HP 84125A     Microwave EMI Measurement System, 1 to 18 GHz
HP 84125B     Microwave EMI Measurement System, 1 to 26.5 GHz
   Special Option E10
              Enables customers to use their own HP 8593EM in an HP 84125A or
              84125B microwave EMI system.

HP 84125C     Microwave EMI Measurement System, 1 to 40 GHz
   Special Option E09
              This option allows customers to use their own HP 8564E
              in an HP 84125C microwave EMI system.

For more information about microwave EMI measurement systems,
contact your local Hewlett-Packard sales representative.


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