There is an EC1000 subminiature triode in the probe body, which is why it gets slightly warm during operation.
Like all active probes, the P6032 requires power, and for this reason it has two connectors at the scope end of the cable. There is a four-pin power connector and a 50 Ω GR-874 connector for the signal.
The triode has limited dynamic range, so attenuator attachments are provided that attach to the tip of the probe. These attenuators also reduce the loading of the probe on the probed circuit.
|Rise time||0.4 ns max.|
|Attenuation||10× to 1000× in 1-2-5 steps with supplied attenuator heads, 3× without attenuator|
|Dynamic range||±0.15 V × attenuation|
|Maximum input voltage||±0.225 V × attenuation, de-rated for CW operation for 500× and 1000× attenuator heads|
|Input resistance||10 MΩ with any attenuator head, 3 MΩ without attenuator head|
|Input capacitance||3.6 pF (10× head) to 1.3 pF (1000× head), 7 pF without attenuator head|
|Output impedance||not specified, calibrated for 50 Ω load|
|DC offset||≈0.5 V (not adjustable)|
The body of the probe contains a clipping line composed of what appears to be 21 mm of RG-174 coax connected to the triode's cathode at one end and open at the other end. The circuit description in the manual describes it vaguely, saying only that, "The clipping line reduces signal aberration to a minimum." Page 40 of the Tektronix Probe Circuits concept book explains in more depth,
The section of 50 Ω coax tied to V1 cathode damps ringing in the high frequency response. The coax is terminated in an open circuit to reflect a short circuit 1/4 wavelength from the termination. Since voltage does not exist at a short circuit, the ringing is damped.
The "V1" in the preceding excerpt refers to V103 in the P6032.
External view of P6032 without attenuator attachment
Internal view of P6032 Probe tip connects directly to triode grid, which is a bare wire coming out of the top of the tube. Clipping line runs along the body of the probe to the left of the tube socket.
×20 attenuator tip
Internal view of power supply connector. Signal coax passes through undisturbed.
Some Parts Used in the P6032
|Part||Part Number(s)||Class||Description||Used in|
|EC1000||Vacuum Tube (Triode)||subminiature triode||P6025 • P6032|