Tektronix P6246 and P6251 differential probes exterior review

There are numerous active probes available for modern digital probes. Active differential probes are vital tool for noise, sensitive signal measurement, power quality validation for digital circuits and digital signal integrity testing.

Every major oscilloscope vendor have differential probes in offering to support various signal levels and bandwidth ranges.

Here we will take a look on two similar probes with next specs:

P6246 P6251
Scope interface 50 Ohm 50 Ohm
Supported scopes 5000 series, 7000/70000 series (with TCA-BNC)
Bandwidth 450MHz 1 GHz
Bandwidth limiter 20MHz 5 MHz
DC reject mode (AC coupling) Yes Yes
Attentuation selector x1 / x10 x5 / x50
Max safe input voltage ±25Vpp ±100Vpp
Common max voltage range 7V(DC+pk AC) 35V(DC+pk AC)
Differential mode range ±.85V (x1) or ±8.5V (x10) ±4.25V (x5) or ±42V (x50)
Input impedance (differential) 200kΩ, <1pF 500kΩ, <1pF

Here’s comparison and photo review of both probes (P6246 on left, P6251 on right).
All photos clickable:

Package kit:

Accessory box:

Front face of probes:

Back face with voltage ranges info:

Another angle:

Bundled calibration data for P6251:


Extra photos:



Tektronix P6246 P6247 service manual

Author: Illya Tsemenko
Published: July 5, 2015, 4:07 a.m.
Modified: Dec. 26, 2016, 12:58 p.m.

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