1
\$\begingroup\$

I'm trying to use a P7504 ($$$) "TriMode" scope probe, and unfortunately the resistors eventually break. Does anyone have recommendations for a 100ohm resistor that would replace the ones on the probe? A new set of just ends is $1600 enter image description here

\$\endgroup\$
3
  • \$\begingroup\$ For a $1600 probe? Might as well go with the best and I don't know resistors that are more precise or stable than metal foil resistors. \$\endgroup\$
    – DKNguyen
    Commented Feb 18, 2020 at 21:45
  • \$\begingroup\$ I have used a similar Tek probe. For a 4 GHz probe, many parameters of the resistor may be critical. If I was making critical measurements, I would only use the exact resistor. \$\endgroup\$
    – Mattman944
    Commented Feb 18, 2020 at 22:09
  • \$\begingroup\$ Yes, that is why I reached out to ask what resistors are ideal to replace the ones on the probe :) \$\endgroup\$
    – Drewster
    Commented Feb 19, 2020 at 16:41

1 Answer 1

1
\$\begingroup\$

That's a 4GHz probe. This Vishay app note on high frequency parasitics may be of use.

enter image description here

One could imagine attaching wires to an 0402 resistor and adding a bit of epoxy... but..

A set of 50 ea. 100 ohm + 50 ea. 75 ohm appears to be a mere $700 from Tektronix. 020-2937-00

\$\endgroup\$
1
  • 1
    \$\begingroup\$ Thank you, Spehro - half the price of the probe kit for 50 of the resistors we actually need sounds more in-line with what we need. Hopefully this helps someone else, too \$\endgroup\$
    – Drewster
    Commented Feb 19, 2020 at 16:42

Not the answer you're looking for? Browse other questions tagged or ask your own question.