HP 84125C Microwave EMI Measurement System, 1 to 40 GHz

Product Summary

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 system for accurately measuring EMI in the 1 GHz to 40 GHz range from intentional and unintentional radiators.

The HP 84125C 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 this system a valuable addition to existing EMI test capabilities.

The HP84125C microwave EMI measurement system has the frequency range and sensitivity to meet your needs today and in the future. The system includes 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 8546E analyzer 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).

Product Features

• Automatic filter tracking

• Input overload protection

• Low system noise

• Interchangeable high-pass filters for 1.5 GHz, 3.5 GHz and 8.25 GHz cut-off frequencies

• Actual field strength results directly displayed in dBµV/m

• Test set is designed for tripod or antenna mast mounting, or it can be hand-held

• Comes installed on a test cart for easy mobility

Product Specifications

Test System Specifications:
Frequency Range:                    1 to 40 GHz
Displayed Average Noise Level
1 to 18 GHz
     Specified:                     8 dBµV1
     Typical:                       -1 dBµV1
18 to 26.5 GHz
     Specified:                     15 dBµV1
     Typical:                       5 dBµV1
26.5 to 40 GHz
     Specified:                     9 dBµV1
     Typical:                       0 dBµV1
Third Order Intercept (characteristic):
                                    >50 dBµV 

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 Range:                    1 to 18 GHz
Antenna Factor Range (typical):4
     1 to 18 GHz:                   24 to 47 dB/m
     18 to 26.5 GHz:                40 to 41 dB/m
     26.5 to 40 GHz:                43 to 44 dB/m
Uncertainty
     1 to 18 GHz:                   ±2 dB
     18 to 26.5 GHz:                ±0.5 dB
     26.5 to 40 GHz:                ±0.5 dB  
VSWR (typical)
     1 to 18 GHz:                   2.8:1
     18 to 26.5 GHz:1.4:1
  26.5 to 40 GHz:                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

Product Ordering Information

HP 84125C     Microwave EMI Measurement System, 1 to 40 GHz
   Opt E10    This option allows customers to use their own HP 8546E
              in an HP 84125C microwave EMI system. The order must include
              the serial number of the customer furnished HP 8546E.
              For more information, contact your local Hewlett-Packard
              sales representative.

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Page Updated: Thursday June 19 16:16:23 UTC 1997