Request a Quote / Contact Us!


    Part Number or Numbers


    AFJ Technologies DDA55+
    Fully digital analyser for measurement of discontinuous disturbance


    AFJ DDA55+ Click Meter

    Compact designed and manufactured compliant to CISPR 16 International Standard for measurements of discontinuous disturbances, called “clicks”, in accordance with requirements of CISPR 14-1 Standard, advanced software for EMC testing, multi-window real time display, time domain analyse, built-in pulse generator.

    Based on a PC integrated architecture with WINDOWS 10 Embedded OS, DDA55+ click analyser is ready to operate through 10.1” LCD display and advanced software for EMC testing to guarantee precise click measurements. DDA55+ click analyser is not just a GO/NO-GO tester, it is a sophisticated analyser supporting a full investigation on when, where and why a click occurs. It provides so a very substantial contribution to problem solving requirements in a critical domain of equipment compliance.

    CISPR 14-1 describes limits for phenomena related to unwanted radio emissions from household appliances and portable tools, including the discontinuous disturbances on the mains cord. A discontinuous disturbance, commonly called “click”, is defined as a disturbance exceeding the limit of continuous emission for no longer than 200ms and separated from a subsequent disturbance by at least 200ms. All automatic, programmedcontrolled machines electrically operated and thermal appliances, and common domestic and lightindustry equipment, generate discontinuous disturbances along the power supply cabling. The effects of such disturbances vary with repetition rate and amplitude: the higher the amplitude of the disturbance, the lower should be its frequency of occurrence.

    For “clicks” – that are for interference emissions that exceed the recognized steady-state limits but for a very limited time – CISPR14-1 has been and is used as the basic standard for short-term emissions as well as a product standard. It is a quoted as a basic reference in the generic IEC 61000-6-3 standard for residential and light industrial limits and IEC 61000-6- 4 standard for industrial environments. Likewise it is referenced in EN55103 product standard for professional audio/video equipment. Such requirement is a time-consuming test, that may take several hours per each phase of the EUT. Thanks to the independence and simultaneous operation of its channels, DDA55+ click analyser greatly reduces the required test time.


    DDA55+ click analyser is a four parallel channels, fixed frequencies (150kHz, 500kHz, 1.4MHz, 30MHz) RF receiver, with each channel provided with Peak and Quasi-peak detectors, fully complies with CISPR 16-1-1. The way the Quasi-peak detectors are designed, enables to automatically perform tests full compliance with the requirements of CISPR 14-1, where requesting to test using an oscilloscope (time-domain operation). The equipment has a built-in impulse generator, which can produce the entire set of single and multiple disturbance pulses as required by CISPR 16-1-1. VCCI Option makes the equipment fully compliant with VCCI Emission Japanese standard by through 500kHz / 550kHz selectable frequencies. DENAN Option makes the equipment fully compliant with DENAN LAW Part.10 Emission Japanese standard for extra long clicks evaluation and Denan rules.


    DDA55+ click analyser main characteristic is its ability to sample, in parallel, the Peak and Quasi-peak levels of the four channels, to recognize and count all clicks (short, long, fast long, continuous noise and switching operations) and store all numeric and graphic data, like waveforms, in the PC hard disk. The PC-based operation of the equipment means practically unlimited memory capabilities and the ability to generate fully automatic test reports. All information collected by the equipment during the test, are displayed in real time on the PC screen, divided into a number of windows corresponding to the number of internal RF channels. Finally, the real superiority of the analyser, resides in the built-in power meters, enabling the continuous monitoring of EUT current consumption: in fact, step variations in this current are often related with disturbances (click) because of the very large bandwidth, that includes all frequencies able to generate a click.

    For the purpose of functional selfassessment, the analyser has a built-in pulse generator, which can produce the entire set of single and multiple disturbance pulses, in the various timing and shift configurations, according to CISPR 16-1-1 (T17) and CISPR 16-1-1 (F.1) tables at the four standard frequencies (150kHz, 500 kHz, 1.4MHz, 30MHz) and at two user defined frequencies.

    AFJ DDA55+ Click Meter Menu

    AFJ DDA55+ Click Meter Menu First Run


    AFJ DDA55+ Click Meter Menu Second Run -



    N. of Digital Direct Sampling Receivers  4 (ADC @ 122.88 MSamp/s)
    Digital Receivers NCO Frequencies 150kHz, 500kHz, 1.4MHz, 30MHz
    Frequency Stability <10×10 -6
    Pulse Response Peak and Quasi-Peak conforming to CISPR 16-1-1
    Pulse Generator Built-in conforming to CISPR 16-1-1
    RF Input 50 Ω Impedance
    N Female Connector
    VSWR Input <1,5:1 (0dB Attenuation)
    <1,2:1 (≥10dB Attenuation)
    Max Input 127 dBµV
    Built-in Attenuator Manual 0 ÷ 30 dB (10 dB/Step)
    Sensitivity 25 dBμV Typ. (Quasi-Peak)
    eMeasurement Accuracy with S/N > 20dB               ± 0.8dB (150kHz; 500kHz; 1.4MHz; 30MHz) 
    Dynamic Range 75 dB Typ.
    RF Shielding 3 V/m
    Test Time Limit 120 minutes
    Image Freq. Rejection  90 dB Typ.
    Displayed Events for Each Channel Peak and Quasi-Peak levels N. of clicks: Short, Long Discontinuous interference Elapsed test time
    N. of Switching Operations Continuous Disturbance Time Snapshot of the last event detected Time Domain
    Interface 10.1” LCD Display
    Ethernet 10/100 MB
    Remotable LAN (LXI Level 0 Protocol)
    Power Supply 110/230Vac ± 10%, 50/60Hz
    Consumption 50VA
    Operating Temperature 0 to 45°C
    Storage Temperature -20 to 70°C
    Size (W x H x D) 450 x 200 x 400mm
    Weight 15Kg