P6202

Template:Plugin Sidebar 2 The Tektronix P6202 is a 500 MHz active 10× FET probe with 50 Ω output impedance, introduced in 1976.

The 6202 has its own mains power supply, the 6202A (1980) has a LEMO S-series connector fitting the 7000-series scopes' probe power outlets.

Key Specifications

Bandwidth	DC to 500 MHz (16 Hz lower limit with additional AC coupling tip)
Rise time	< 0.7 ns
Attenuation	10 : 1 (100 : 1 with additional 10× attenuator tip, 010-0384-00)
Input impedance	10 MΩ // 2 pF with or without additional 10× attenuator tip, +2 pF for AC coupling tip
Input range	± 6 V (± 60 V with additional 10× attenuator tip)
DC Offset range	± 55 V (± 200 V with additional 10× attenuator tip)
Max input	± 200 V (nondestructive)
Signal cable length	2 m (6.5')

Internals

An initial 8 MΩ : 2 MΩ divider drives a dual JFET (source follower + current source), a PNP emitter follower and finally an NPN emitter follower as a cable driver. These stages use SMD components located in the probe tip. The probe control box at the end of the coax only contains a ±7 V regulator, a switchable 50 Ω terminator, and the offset potentiometers that supply ±15 V to the bottom of the input divider. There is no input protection apart from the divider.

Pictures

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  Carrying case

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  Probe in case, with power supply, 10:1 pre-divider tip (010-0384-00), hook tip, AC coupling tip and connection box.

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  Amplifier in probe tip (SMD components in 1976!)

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  Amplifier in probe tip, reverse

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  Connection box

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  P6202A

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  P6202A

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  P6202A

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  P6202A

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  P6202A

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  P6202A Probe power connector

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  Case exterior

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  schematic

Measurements

Rise time of a P6202 500 MHz FET probe measured on a 7S12 plugin in a 7844 mainframe (with 25 ps S-52 pulse generator head and 25 ps S-4 sampling head). Measured rise time ~440 ps observed on this specimen is equivalent to 795 MHz bandwidth.

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  at 1 ns/Div

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  at 100 ps/Div