P6042

Tektronix P6042
DC−50 MHz current probe P6042 complete Compatible with 50 Ω scope inputs Produced from 1967 to (?) Manuals Tektronix P6042 Manual (PDF)

Manuals – Specifications – Links – Pictures

The Tektronix P6042 is a DC to 50 MHz current probe introduced in 1967. It was designed by Cal Hongel.

The sensor contains a current transformer for HF and a hall effect sensor for LF/DC components. The amplifier combines DC/LF and HF signals.

The AM503, introduced about a decade later, is a redesign of the P6042 with removable probes.

Key Specifications

Bandwidth	DC to 50 MHz (−3 dB)
Rise time	7 ns
Ranges	1 mA/div to 1 A/div (1–2–5) with scope in 50 mV/div
Output	to 50 Ω scope input at 50 mV/div
Maximum input	10 A DC+peak AC in 5 mA to 1 A ranges, 0.5 A in 1 mA and 2 mA ranges
Power	90-136 or 180-272 V, 20 W

Internals

Locking the probe requires pushing past the resistance felt when the core almost closes. This engages a mechanism that firmly presses both core halves together, and extinguishes the "Probe unlocked" indicator.

The P6042's core halves are precision lapped and potted with epoxy. They have Mu-metal screening. The lower (fixed) core also contains the Hall element. Unfortunately, the P6042 probe is quite sensitive mechanically, and in many units offered for sale, the cores are damaged.