J2151A PerfectPulse® Fast Edge Signal Generator


  • Precise, Fast Edge Generation and TDR in one convenient packages
  • Ultra-fast rise time and fall time of 32ps (typical) with little variance
  • No overshoot or undershoot
  • Variable output pulse train with 1kHz, 10kHz, 100kHz, 1MHz, and 10MHz square wave
  • Output signal amplitude 0 to -500mV (50 Ohms), trimmed to 1%
  • 3.5mm connector for long life reliabilitys
  • Includes 10GHz power splitter for TDR operation
  • USB powered with 100mA typical operating current. Can be used with USB charger or battery
  • Compatible with the Picotest P2100A PDN probe, as well as other manufacturers 50 Ohms probes for signal injection

What's included:

  • PerfectPulse Signal Generator
  • TDR Adapter
  • Picotest TDR Demo Trace Board
  • 1 Year Warranty
  • Model Description Price  
    J2151A J2151A PerfectPulse Fast Edge Signal Generator
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    The PerfectPulse signal generator provides a square ~32ps edge pulse in a pocket size, self-contained package, requiring only a USB power source. Single button operation allows selection of different operating modes, while Red, Yellow and Green LEDs indicate the current operating mode. The -500mV, 50 Ohm output signal is very square, without overshoot or undershoot making it perfect for verifying instrument and probe rise/fall times, as well as verifying signal path rise/fall time and undershoot/overshoot. The addition of a 10GHz power splitter allows the signal generator to be used as a reflectometer for measuring PCB coupons, cable and PCB trace impedance, verifying cable crimps, measuring trace and cable lengths, dielectric constant and many other applications.

    The 3.5mm output connector provides many more mating cycles than 2.92mm or SMA connectors for longer life while mating with SMA and 2.92mm connectors (

    Compatible with all 50 Ohm probes, including the Picotest P2100A 1-Port probe, for convenient signal injection.

    Product Applications

    •  All applications requiring a fast, precise edge

    •  DSP correction and calibration

    •  TDR – Time Domain Reflectometry

    •  Low cost PCB coupon tester - Characteristic Impedance of Lines on Printed Boards

    •  Measure cable and PCB trace length, characteristic impedance, and dielectric constant

    •  Verify the integrity cable crimps and connector launches

    •  Measure PCB trace path rise/fall time and overshoot/undershoot

    •  Supports cable and trace loss modeling

    •  Scope probe calibration

    •  Test the frequency bandwidth, rise/fall time, and flatness of lab instruments and probes

    Using the TDR function of PerfectPulse to test a 50ohm cable, the scope image shows an average of 50 ohm in the grey averaging area.  

    Three LEDs: red, yellow, and green indicate the mode the key is in.

    Mode Description Red Yellow Green Notes
    1 OFF x x x
    2 DC x    
    3 1kHz Square Wave   x   50% Duty Cycle
    4 10kHz Square Wave     x 50% Duty Cycle
    5 100kHz Square Wave x x   50% Duty Cycle
    6 1MHz Square Wave x x 50% Duty Cycle
    7 10MHz Square Wave x x 50% Duty Cycle


    • Typical rise/fall time: 32ps
    • USB input
    • Output Connector 3.5mm
    • Output Voltage 0 - 500mV, Trimmed to 1% +-2.5mV
    • Output Impedance 50 Ohms, Trimmed to 1%
    • Flatness 3dB at 10.5GHz 0.1dB (typ) at 2GHz

    Caution: To avoid equipment damage and/or severe injuries or death ensure that the absolute maximum ratings are observed and not exceeded at all times.

    Test Setup for 2-Port Shunt-Through Component Measurement

    Trace 1 is a 50ohm trace. Trace 2 is called a “Beatty standard” It generates a significant reflection and can be used to get the parameters of the circuit board dielectric. Trace 3 is 50 Ohms with markers 3” apart so that you can measure the speed of the signal relative to the speed of light. The ratio is related to the dielectric constant of the circuit board. The second “dip” is much shallower than the first because the edge was slowed so much by the first marker (capacitive). Trace 4 is a shallow impedance step of roughly 5% (50 Ohms to ~52.5 Ohms) Scope image showing the change from 47 to 53 Ohms on the Picotest Demo board Using the TDR function of PerfectPulse, you can easily see the bad cable crimp as evidenced by the impedance ring Using the TDR function of PerfectPulse to test a 50ohm cable, the scope image shows an average of 50 ohm in the grey averaging area

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