FIGURE 4
curve. To confirm what the manufacturer told me, I tried out
several sets of these and got identical results. I also tried out
some others from different manufacturers and the results
were very close. Just to be on the safe side though, stick
with the numbers in the Parts List. The final specs on the
probe work out to this:
• Attenuation ratio: 4:1 (4X probe)
• Frequency response: 0.5 to 500 MHz ±0.5 db
• Maximum tip input: 8V p-p
• Input impedance: 3,400 ohms - 0.2 pF
• Probe tip impedance: 3,400 ohms - <0.5 pF
• Rise time <500 pF
• - 3 db point >750 MHz (estimated)
Probe Construction
The construction of this probe is quite simple and low
cost. I had an old Pomona box laying around that I used for
the active board enclosure. The cables came out of my junk
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November 2010 49
