Repair and teardown of Tektronix TMDP0200 and THDP0100 probes

Tektronix TMDP0200 High-Voltage 200MHz differential probe

Feature set of TMDP0200 probe:

  • DC to 200 MHz Bandwidth
  • Maximum voltage 550V CAT I, 300V CAT III
  • Risetime <1.8 ns, slew rates <275 V/ns at 1/250 gain
  • 10 MΩ Differential input impedance
  • 5 MΩ single-ended input impedance for each tip
  • 2 pF Input Capacitance
  • 25x and 250x Attenuation (±75Vpk or ±750Vpk ranges)
  • TekVPI Interface

I’ve bought this probe as broken/for parts. MSRP for the new Tek TMDP0200 is around $2130 USD.

Diagnostics

Probe had no physical damage from outside, did not have any accessory bundled with sale. Out of service tag with “unit will not switch out of 750V” was included in the bag.

However, after connecting to our Tektronix DPO7104C scope probe was correctly recognized and detected, and worked just fine. Easiest repair ever! :)

It also came with huge hook clips with Fluke logo stamped on the ends. Very nice high-quality kit.

Probe has auxilary electronics in connector head, that plugs into TekVPI oscilloscope port. Actual probe high-voltage electronics and front-end is located in plastic enclosure body. There is custom 4-layer PCBAs, mounted with in internal aluminum shields.

Just like any other active Tektronix probe, this PCBA have “smarts” for probe detection/control and power supplies for active amplifiers/compensation.

Overload function also worked correctly, with probe emiting faint beeps and flashing red LED.

Typical to Tektronix probes, there is little ATMEL ATmega8 8-bit microcontroller to select various probe functions, provide digital identification for scope, store serial number, etc.

Benchmarking Tektronix TMDP0200 probe

For high-voltage tests I’ve used trusted Fluke 5720A with Fluke 5725A booster amplifier and Tektronix DPO7104C oscilloscope.

Test results

Spectrum plot of 350 VAC, 100 kHz sine measured via TMDP0200 probe on 750Vpk-pk range and 5 MHz bandwidth mode.

Some result files and reports:

Tektronix THDP0100 High-voltage 100 MHz probe.

This probe is more interesting, as it’s rated for voltages up to 6kV.

Feature set of TMDP0200 probe:

  • DC to 100 MHz Bandwidth
  • Maximum voltage 2300V CAT I, 1000V CAT III
  • Risetime <3.5 ns, slew rates <2500 V/ns at 1/1000 gain
  • 40 MΩ Differential input impedance
  • 20 MΩ single-ended input impedance for each tip
  • 2.5 pF Input Capacitance
  • 100x and 1000x Attenuation (±600Vpk or ±6000Vpk ranges)
  • TekVPI Interface

I’ve bought this probe as broken/for parts. MSRP for the new Tek THDP0100 is around $3620 USD.

TBD

Author: Illya Tsemenko
Published: April 23, 2020, 2:29 a.m.
Modified: April 29, 2020, 5:30 a.m.

References

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