P2105A The Versatile Multi-Function Probe
The Picotest P2105A probe is a 50Ohm 1-port transmission line ‘Browser’ probe. With superior user ergonomics, the probe is simple to hold and probe with using integrated spring pins (pogo pins).
However, what sets the P2105A apart from other probes is its unmatched versatility. Users can swap (snap on and off) various heads on the common handle making this probe extremely versatile. It can be used for TDR, voltage ripple (as with other power rail probes), transient load current stepping, and near-field testing applications. In other words, it supports a variety of measurements including impedance. TDT/TDR, ripple, noise, PCB power rail, VRM (Voltage Regulator Module) and PDN impedance, and clock jitter. It has significant advantages in comparison to active probes and other types of passive probes as can be seen by a review of the specifications.
Please use the buttons below to see information for P2105A for the specific tests you are using it for.

The P2105A is referred to as a ‘browser’ probe for its ability to quickly and easily 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 no 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 trace.
The P2105A 5-in-1 probe uses interchangeable heads to change functionality. Probe heads are available for TDR/Ripple/Impedance, transient load current stepping, and near-field measurements. Different probe pitches are also color-coded.

What’s included
- P2105A 1-Port Probe Head (additional heads sold separately)
- P2105A Probe Handle with One (1) 1m SMA or BNC-Mini SMP PDN Cable®
- 1 Year Warranty

P2105A The Versatile Multi-Function Probe
Detailed Specifications
Characteristic | Rating |
---|---|
Bandwidth | DC-15GHz * |
TDR/Ripple/Impedance Head Probe Pin Pitch/Spacings | Comes in one of the following: 20 mil – 0.508mm 31mil – 0.79mm 40mil – 1.02mm 50mil – 1.27mm 60 mil – 1.52mm 70 mil – 1.78mm 80 mil – 2.03mm 100 mil – 2.54mm 150 mil – 3.81mm GSG SMA Near Field: 31mil or 100mil (H-Field Loop), BW 1GHz Custom pitches available |
Load Step Head | 70 mils |
S10 Load Transient R/F Time | ~3ns 0 – 10A *, 100us pulse, <1W avg., 0.8V – 72V |
S10 Head | SMPM, spring tip, Loading 120pF @0V |
Impedance Range | Typical 1-port impedance reflection floor -ceiling limits (~100mohms – ~100k ohms). Not probe dependent. See your instrument’s manual |
Input C: | <1pF |
Attenuation | 1X, NOT user changeable |
Probe Connectors | SMA or BNC |
Probe Loading Input | 50 ohms |
Operating Temperature | 0 to 45° C (32° F to 104° F) at 80% Relative Humidity |
Nominal Length with Cable | 1 meter |
Maximum Relative Humidity | 80% at 31° C max |
Usage | Indoor |
Altitude | 3000 m (9850 feet) |
Absolute Maximum Voltage | < 50VAC and 75VDC |
Caution:
To avoid equipment damage and/or severe injuries death or death do not use this probe close to voltages higher than 50 VAC or 75 VDC.
* Calibration dependent
Model | Description | Price |
---|---|---|
P2105A-1X | 1-Port TDR Browser Probe (Various Fixed Pitches, 1X attenuation) | $2,750.00 Add to Cart |
P2105A-1X-TIP | 1-Port TDR – Probe Head Only | $400.00 Add to Cart |
The Picotest P2105A probe is 50 ohm 1-port transmission line ‘Browser’ probe for TDR applications. This precision probe supports a variety of measurements using the 1-port reflection methodology including primarily impedance and TDT/TDR, but also ripple, noise, PCB power rail, VRM (Voltage Regulator Module), and clock jitter. It has significant advantages in comparison to active probes and other types of passive probes.
The P2105A 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 trace. The P2105A comes in various fixed pin pitches (20, 31, 40, 50, 60, 70, 80, 100, or 150 mil spacing with 1X attenuation; GSG SMA and custom pitches are also available).
The probe is compatible with all 50 ohm instruments, including the J2154A PerfectPulse TDR, vector network analyzers (VNAs), oscilloscopes, and spectrum analyzers. The probe is designed to work with the traditional single ended TDR setup.
P2105A The Versatile Multi-Function Probe
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