The P6139B and P5050B are 500 MHz, high-impedance 10X passive voltage probes with 10 MΩ input resistance. Both feature a small probe head and a sharp tip that makes it easier to probe dense circuitry, and a small probe body that improves visibility to the device under test. The two models share similar electrical specifications but support Tektronix oscilloscopes with different compensation ranges.

A passive voltage probe connects a circuit node to an oscilloscope input while minimizing the loading the measurement places on the circuit. These probes are intended for low power devices, service, manufacturing engineering, and test research and development applications.

ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois.

Brand Heritage

Tektronix, Inc. was acquired by Danaher Corporation in 2007. In 2016, Tektronix became part of Fortive Corporation when Fortive was spun off from Danaher.

Compare Other Models in This Series

The P6139B and P5050B form a pair of 500 MHz, 10X passive voltage probes that share a common electrical design. Both deliver a 10 MΩ, 8 pF input impedance at the probe tip, a 300 V CAT II dynamic range, and a 1.3 m cable, paired with a compact probe head and sharp tip for probing dense circuitry.

The two models are differentiated by the compensation range they support, which determines the Tektronix oscilloscopes each is matched to. Selecting between them is a question of host-oscilloscope compatibility rather than a difference in core probe performance.

Each new model below is its own dedicated product page with condition-matched pricing. Select the model whose compensation range matches your oscilloscope, then choose the listing that fits your requirement.

The P6139B and P5050B are electrically alike — both are 500 MHz, 10X passive probes with 10 MΩ, 8 pF tip impedance and a 300 V CAT II rating. The defining difference is the compensation range: the P6139B covers 8 pF to 18 pF, while the P5050B covers 16 pF to 22 pF. This determines which Tektronix oscilloscope compensation ranges each probe supports.

Because the models differ in supported compensation range rather than headline performance, the right choice depends on the host oscilloscope. The comparison table below lists the compensation range and shared characteristics for each model so the correct probe can be matched to the target oscilloscope.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Accessories Supplied

• Rigid tip 3.8mm (P6139B), Qty 1, Reorder Part Number 206-0635-00
• Long Ground Spring, Qty 2, Reorder Part Number 016-2028-00
• Alligator Ground (6”), Qty 1, Reorder Part Number 196-3521-00
• Hook Tip (Regular), Qty 1, Reorder Part Number 013-0362-00
• IC Cap (universal) 3.8mm (was 3.5), Qty 1, Reorder Part Number 013-0366-00

Product Core & Specifications

Important: Maximum input voltage: 300 V CAT II.

Important: The P6139B and P5050B share similar electrical specifications but support Tektronix oscilloscopes with different compensation ranges (P6139B: 8 pF to 18 pF; P5050B: 16 pF to 22 pF). Reference the Oscilloscope Probe & Accessory Selector Tool at www.tektronix.com/probes to ensure the correct probe is selected for your oscilloscope.

Important: The P6139B and P5050B feature the TekProbe Interface for direct BNC connection to oscilloscopes with 1 MΩ inputs.

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.