EEVblog2 - High Frequency Active FET Probing DEMONSTRATED

[exit_failure]

Tektronix used to build really crazy passive Probes in the seventies: Through dumb luck I have a couple of P6057 and P6056 probes in my collection though i have to admit that i haven't had much use for them yet.

The P6057 is a 1.4 GHz, 1 pF, 50 V, 5 kOhm probe.
The P6056 has an absolutely crazy bandwidth of 3.5GHz, 1 pF, 16V max but only 500 Ohm.

For HF stuff I mostly use my P6245 active probes. Can you think of real world scenarios where one of those passive probes would be preferable?

[tggzzz]

Tektronix used to build really crazy passive Probes in the seventies: Through dumb luck I have a couple of P6057 and P6056 probes in my collection though i have to admit that i haven't had much use for them yet.

The P6057 is a 1.4 GHz, 1 pF, 50 V, 5 kOhm probe.
The P6056 has an absolutely crazy bandwidth of 3.5GHz, 1 pF, 16V max but only 500 Ohm.

For HF stuff I mostly use my P6245 active probes. Can you think of real world scenarios where one of those passive probes would be preferable?

What is the significance of "EEVblog2 - " in the thread title?

For those that don't have instant recall of all Tek probe's characteristics, here's the P6245:

Bandwidth    1.5 GHz on ≥10 GHz scope, 1 GHz on TDS684A
Rise time    267 ps on ≥10 GHz scope
Input impedance    1 MΩ // ≤ 1 pF
Maximum signal voltage    ±8 V (linear range)
Offset voltage range    ±10 V
Maximum input voltage (non-destructive)    ±15 V
Signal delay time    5.3 ±0.2 ns

At GHz frequencies, a "500ohm" tip resistance will be dominated by the 1pF tip reactance; do the calculation!

What is the relative cost and availability of the two classes of probe?

Which is more robust when used on circuits? What are the failure mechanisms? Include "bad practices" !

[joeqsmith]

The P6057 is a 1.4 GHz, 1 pF, 50 V, 5 kOhm probe.
The P6056 has an absolutely crazy bandwidth of 3.5GHz, 1 pF, 16V max but only 500 Ohm.

For HF stuff I mostly use my P6245 active probes. Can you think of real world scenarios where one of those passive probes would be preferable?

Compared with the P6245 which has a Max Voltage (Nondestruct) (DC+PkAC)   ±15 V.    So cases where you are working with higher voltage?

3.5GHz compared with the P6245 which has a Bandwidth in GHz (Probe Only)   1.5 GHz.   So cases where you are working at higher frequencies? 

You would need to tell me what your application for them is.       

[thm_w]

What is the significance of "EEVblog2 - " in the thread title?

https://www.eevblog.com/forum/blog/eevblog-1368-active-oscilloscope-probes-compared-(part-2)/