# Title: Picotest P2105A Multi-Function TDR Probe - 15GHz Browser Probe ## Description: High-Performance TDR Measurement Solution The Picotest P2105A is a versatile 50-ohm, 1-port transmission line 'browser' probe engineered for precision time domain reflectometry (TDR) measurements. This multi-function probe features interchangeable snap-on heads that enable engineers to tackle five critical measurement types: TDR impedance testing, power rail ripple analysis, transient load stepping, near-field measurements, and PDN impedance characterisation. Wiring Quick-Start Connection Cable Type Instrument Port P2105A to Oscilloscope 1m SMA-Mini SMP PDN Cable Channel 1 (50Ω input) J2154A TDR Generator SMA cable Channel 2 (reference) Ground Connection Probe tip to DUT ground PCB ground plane Technical Specifications Parameter Specification Notes Bandwidth DC to 15GHz Pitch and calibration dependent Impedance 50Ω nominal Compatible with all 50Ω instruments Input Loading <1pF Minimal circuit loading Measurement Range ~100mΩ to ~100kΩ Instrument dependent Available Probe Head Configurations TDR/Impedance/Ripple Heads: Available in fixed pitches of 20, 31, 40, 50, 60, 70, 80, 100, and 150 mil spacing, plus GSG SMA configuration. Custom pitches available on request. S10 Load Stepper Head: Provides 0-10A transient load stepping with ~3ns rise/fall time for power supply validation testing. Near-Field Head: Available in 31 mil and 100 mil H-field loop configurations with 1GHz bandwidth for EMI troubleshooting. Browser Probe Design The P2105A's 'browser' designation refers to its ability to quickly move from point-to-point across PCBs without requiring permanent test points or SMA connections. The spring-loaded probe tips ensure reliable contact while the slim, ergonomic design provides excellent visibility and access to dense circuit layouts. TDR probe contact demonstration on PCB trace Compatibility and Integration Fully compatible with all 50-ohm test instruments including: Safety Note: Maximum voltage ratings: <50VAC and 75VDC. Always verify DUT voltage levels before connecting the probe. ## Product type: TDR Probe ## Vendor: Picotest ## Tags: Load Stepper, Oscilloscope Probe, Picotest, Probe, spec-oscilloscope-probe, TDR, Test Probe ## Price range: 2392.5 - 2392.5 GBP ## Link: https://thedebugstore.com/products/picotest-p2105a-tdr-probe ## Options - Title: Default Title ## Collections - [New Products](https://thedebugstore.com/a/llms/collections/new-products-debug-store) - [Admin: No Inventory](https://thedebugstore.com/a/llms/collections/no-inventory) - [Oscilloscope Probes](https://thedebugstore.com/a/llms/collections/oscilloscope-probes-catalogue) - [Picotest](https://thedebugstore.com/a/llms/collections/picotest-catalogue) - [Test Probes](https://thedebugstore.com/a/llms/collections/test-probes) - [Picotest Probes](https://thedebugstore.com/a/llms/collections/picotest-probes) - [Picotest TDR](https://thedebugstore.com/a/llms/collections/picotest-tdr) - [Picotest Load Stepper](https://thedebugstore.com/a/llms/collections/picotest-load-stepper) ## Variants - Default Title, SKU: P2105A, Available: yes, Inventory: 0 ## Metafields - badge: - widget:

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- manufacturer: PicoTest - warranty: 12 months - mpn: P2105A - backorder_label: If no stock is shown above, order now and we'll ship within 7 working days. - title_tag: Picotest P2105A Multi-Function TDR Probe | 15GHz Browser Probe | Debug Store - attachments: [{"download_file":[{"download_file":"Picotest P2105A 1-Port TDR Browser Probe Datasheet"}],"download_filetype":[{"download_filetype":"pdf"}]},{"download_file":[{"download_file":"TDR Measurement Application Note"}],"download_filetype":[{"download_filetype":"pdf"}]}] - description_tag: Professional 15GHz TDR probe with interchangeable heads for impedance, ripple & load testing. Compatible with all 50Ω instruments. Buy online. - condition: new - custom_product: false - mpn: P2105A - google_product_category: Electronics - warranty: 12 months - brand: Picotest - brands: gid://shopify/Metaobject/56256102623 - breadcrumbs: ["gid://shopify/Collection/267180835005"] - key_feature_1: Multi-function 15GHz browser probe with interchangeable heads for TDR, ripple, impedance, and transient load testing. - manufacturer: PicoTest - customhs_code: 903084 - detailed_description: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"The "},{"type":"text","value":"Picotest P2105A","bold":true,"italic":true},{"type":"text","value":" ","italic":true},{"type":"text","value":"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 (31, 40, 50, 60, 70, or 100 mil spacing with 1X attenuation; GSG SMA and custom pitches are also available)."}]},{"type":"paragraph","children":[{"type":"text","value":"The "},{"type":"text","value":"P2105A","bold":true},{"type":"text","value":" 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."}]}]} - summary:

The Picotest P2105A represents a breakthrough in measurement probe versatility, combining five essential test functions in a single, compact instrument. This precision 50-ohm transmission line probe delivers superior performance across TDR impedance measurements, power rail ripple analysis, transient load stepping, near-field EMI detection, and PDN characterisation applications.

The probe's innovative interchangeable head design allows engineers to adapt quickly between measurement types without investing in multiple specialised instruments. Each head is optimised for specific applications while maintaining the probe's exceptional 15GHz bandwidth and minimal circuit loading characteristics.

Key Advantage: The P2105A achieves very low inductance at the probe tip, making it ideal for dense PCB layouts where traditional test points cannot be implemented.

Compatible with industry-standard oscilloscopes and network analysers, the P2105A integrates seamlessly with the Picotest J2154A PerfectPulse TDR for complete impedance measurement solutions. The probe's browser-style operation enables rapid point-to-point measurements across multiple PCB locations without recalibration.

Available in multiple pitch configurations and attenuation levels, the P2105A serves applications from prototype validation through high-volume production testing. Its robust construction and ergonomic design ensure reliable operation in demanding laboratory and field environments.

- key_feature_2: 15GHz High Bandwidth Performance - key_feature_2_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Ultra-wide bandwidth enables precise high-frequency impedance and TDR measurements"}]}]} - key_feature_3: Interchangeable Snap-On Probe Heads - key_feature_3_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Five measurement functions in one probe: TDR, ripple, impedance, load step, near-field"}]}]} - key_feature_4: Browser-Style Point-to-Point Operation - key_feature_4_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Quickly move between test points without permanent connections or recalibration"}]}]} - key_feature_5: Multiple Fixed Pitch Configurations - key_feature_5_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Available in 20-150 mil spacings plus GSG SMA and custom options"}]}]} - key_feature_6: Ultra-Low Circuit Loading - key_feature_6_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"<1pF input capacitance minimises measurement impact on sensitive circuits"}]}]} - key_feature_7: 50-Ohm Universal Compatibility - key_feature_7_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Works with oscilloscopes, VNAs, spectrum analysers, and TDR instruments"}]}]} - key_feature_8_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Ensures reliable electrical contact while protecting delicate PCB surfaces"}]}]} - key_feature_8: Spring-Loaded Probe Tips - why_people_choose_3_title: Rapid Point-to-Point Testing - why_people_choose_2_title: Precision TDR Measurements - why_people_choose_1_title: Versatile Multi-Function Design - why_people_choose_1: One probe replaces five separate instruments, reducing bench space and investment costs - why_people_choose_3: Browser operation eliminates need for permanent test points on dense PCB layouts - why_people_choose_2: 15GHz bandwidth resolves impedance discontinuities down to 180-mil spatial resolution - 1571649: What pitch sizes are available for the P2105A TDR probe?***SIMP***The P2105A is available in fixed pitches of 20, 31, 40, 50, 60, 70, 80, 100, and 150 mil spacing, plus GSG SMA configuration. Custom pitch sizes can be manufactured to order for specific applications. - 1571651: Can the P2105A measure both single-ended and differential impedances?***SIMP***The P2105A is designed for single-ended TDR measurements. For differential impedance testing, use two P2105A probes together or consider the dedicated Picotest P2103A differential TDR Probe. - 1571652: What oscilloscopes are compatible with the P2105A?***SIMP***Any oscilloscope or instrument with 50-ohm input impedance can use the P2105A. It works particularly well with high-speed oscilloscopes when paired with the Picotest J2154A TDR generator for complete impedance analysis. - 1571653: How do I change between different probe head types?***SIMP***The P2105A features a snap-on head design that allows quick changes between TDR/impedance, S10 load stepper, and near-field heads without tools. Each head is colour-coded for easy identification. - 1571654: What is the measurement accuracy of impedance readings?***SIMP***Measurement accuracy depends on the instrument used and calibration setup. Typical 1-port impedance reflection limits range from ~100mΩ to ~100kΩ. The probe itself introduces minimal error when properly calibrated. - 1571655: Can the P2105A be used for power rail ripple measurements?***SIMP***Yes, the P2105A is one of the lowest-noise power rail probes available, making it excellent for ripple measurements on voltage rails. It offers superior performance compared to many active power rail probes. - 1571656: What safety precautions should I observe when using the P2105A?***SIMP***Never exceed the maximum voltage ratings of 50VAC or 75VDC. Always verify circuit voltage levels before probe contact. The probe is not isolated and should only be used on circuits within its voltage specifications. - 1571657: What cable length is standard with the P2105A?***SIMP***The P2105A comes with a 1-metre SMA-Mini SMP PDN cable for low coupling and optimal shielding. Longer cables are available but may affect high-frequency performance. - 1571658: Is calibration required for TDR measurements with the P2105A?***SIMP***While calibration is not strictly required, it significantly improves measurement accuracy. The probe works with standard TDR calibration procedures using open, short, and load standards at the probe tip.