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  • High bandwidth - > 6 GHz (uncorrected)


  • < 1pf, 420fF typical)
  • Very flat frequency response (Impedance floor ~ 100mohms)
  • Supports Browsing Measurement on Multiple Rails

    o Impedance, Ripple, Noise TDT/TDR, 2 port impedance (using two P2104A probes), PCB resonances, Clock Jitter and Non-invasive Stability

  • Applications: Power Integrity, Power Electronics, Signal Integrity
  • Available in various attenuations and pin pitches: Optimized for sensitivity and SNR
  • Integrated series resistor option available for extended measurement range
  • Integrated DC Block available for sensitive AC ripple/noise measurements or to reduce DUT loading for impedance measurement
  • Use Two P2104A 1-Port Probes for High Bandwidth 2-Port Measurements
  • Bi-directional - send signals to the DUT for signal injection or receive signals from the DUT
  • Use as a Browser accessory with Power Rail probes
  • 50 ohm impedance compatible with all 50 Ohm instruments
  • Rugged, ergonomic design, small form factor gets into tight places
  • Slim body with spring tips provides good visibility of the target and reliable connectivity
  • Uses PDN Cable® for optimum performance
  • Includes P2100A-CAL Calibration Board for SOLT and ISOLATION calibration
  • Supports NISM - Non-Invasive Stability Measurement for Phase Margin Testing


What's included:

1-port probe, calibration board, PDN Cables®.
Getting Started Guide
One (1) Year Manufacturer's Warranty



The Picotest P2104A probe is 50 ohm 1-port transmission line 'Browser' probe. This precision probe supports a variety of measurements using the 1-port reflection methodology including impedance, ripple, noise, TDT/TDR, PCB power rail, VRM (Voltage Regulator Module), clock jitter, and non-invasive stability (NISM). It has significant advantages over active probes and other types of passive probes.


The P2104A is a referred to as a 'browser' probe for its ability to easily and quickly be moved from point-to-point/rail-to-rail simply by reseating the probe points. The probe achieves a very low inductance at the tip to mitigate space constraints on a dense PCB, while eliminating the need to add additional SMA connections or other test points necessary for impedance measurements. It is especially useful when there are multiple rails to assess and there is not time or PCB iterations available to provide test point implementations for each. Repeated measurements are simplified because connection is by simply touching the tip to existing output capacitor pads. The P2104A comes in one of four fixed pin pitches (50, 60, 70, or 100 mil spacing). The pin pitch is fixed and not interchangeable. The P2104A probe tips are available as 1X, 2X, 5X, or 10X attenuations. An AC coupled option providing DC blocking is also available along with the 1X attenuation option. This allows flexibility for users to measure across a wide range of voltages and capacitor sizes. As an example, the upside of the 2X attenuation probe is that it can measure 6.5VDC without DC blocks. The tradeoff is the attenuation increases the impedance floor. In short, this 1-port P2104A probe is best suited for VRM, power plane, and decoupling measurements. An added benefit is that you can use Non-Invasive Stability Measurement (NISM) to assess power supply's stability at the same time as you assess the PDN impedance.


The probe is compatible with all 50 ohm instruments, including vector network analyzers (VNAs), oscilloscopes, and spectrum analyzers.


The probe is designed to work with the traditional 1-port reflection impedance setup. A source power amplifier such as the OMICRON Lab B-AMP 12 (OL000168) can help measure ultra-low impedance magnitudes.


What’s a Transmission Line Probe

Transmission line probes are a special type of passive probe that replaces the high impedance probe cable found in a traditional passive probe with a precision transmission line that has a characteristic impedance that matches the oscilloscope's input (50 ohms). This greatly reduces the input capacitance to a fraction of a picofarad, minimizing the loading of high frequency signals. The probes are referred to as 'PDN' probes, because of their effective use in measuring the low and ultra-low impedances found in power distribution networks.


The input impedance of the Picotest probes remains nearly constant over their entire frequency range. A traditional ÷10 passive probe has a high input impedance at DC; however, this impedance drops rapidly with frequency, passing below the input impedance of a transmission line probe at <100MHz. The probes are useful in applications that produce fast rising, narrow pulses with amplitudes which exceed the dynamic range of active probes. They also tend to have less parasitic effects on frequency response, so they are ideal for measuring impedance. By providing a simple yet elegant solution to probing high-frequency signals, Picotest’s one and two-port transmission line probes preserve signal fidelity and allow high-bandwidth test equipment to properly measure circuit characteristics.


Picotest P2104A 1-Port Transmission Line PDN Probe

  • Probe Voltage and Impedance Impedance: Maximum Tip Voltage

    50 ohms: 5 Vrms (1X Attenuation)

    100 ohms: 8.9 Vrms (2X Attenuation)

    250 ohms: 11 Vrms (5X Attenuation)

    500 ohms: 14Vrms (10X Attenuation)

    VNA Port Voltage *






    Bandwidth DC-6GHz-8GHz **

    100 mil, 70 mil, 60 mil, 50 mil

    1X Attenuation

    Impedance Range Typical 1-port impedance reflection floor -ceiling limits (~100mohms - ~k ohms). Not probe dependent. See your instrument's manual
    Input C: <1pF TBD
    Maximum thru Current any Port 1Amp
    Probe Connections MINI_SMP
    Probe Tip Size/ Probe Pitch Available in various pitches 50 mil 60 mil 70 mil or 100 mil
    Probe Pitch is Fixed
    Insulation Resistance 20Mohms
    Rise Time (1X) 58ps (100 mil), 50ps (60/70 mil), and 44ps (50 mil)
    Operating Temperature 0 to 45° C (32° F to 104° F) at 80% Relative Humidity
    Nominal Length with Cable 1 meter
    Attenuation Available in various attenuations 1X, 2X, 5X, 10X, DC Block. Selected when purchased, NOT changeable by user
    Maximum Relative Humidity 80% at 31° C max
    Usage Indoor
    Pin Resistance Typical: 15m Ohms, Maximum 30m Ohms **
    Altitude 3000 m (9850 feet)
    Absolute Maximum Voltage

    < 50VAC and 75VDC

    Note: The specifications are subject to change without notice.

    * The Maximum Port Voltage shown is based on the specified maximum tip voltage. Consult your VNA's manual to verify the VNA port voltage is below the ratings of your instrument.

    ** The actual bandwidth and minimum measurable impedance obtained are dependent on the calibration and your test setup.

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