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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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X10 Low Impedance Probe
Hi folks,
The other day, I was trying to troubleshoot a 100MHz amaplifier in a piece of equipment ( actually, a Cushman CE-3 Spectrum Monitor ). I was using a 150MHz tektronix scope with a 10X probe. I was getting different results with each measurement, it was driving me crazy. My friend Bob, the RF guru, said "Your trouble is that you're using the HI-Z input to the scope. For VHF, Hi-Z is crap. It just doesn't work. Especially if you have a pigtail for the ground." Guilty as charged... He then asked if the scope had a 50-ohm input ( which it does ). "Then just make up a probe with a 450-ohm series resistor, and some little ground clip. That's all you need. It will be stable, and it will work up to about a gig. The impedances in this RF stuff tend to be low anyway, so you don't really need Hi-Z." Makes sense. Any way to buy a probe like this off he shelf? - Jerry Kaidor ( ) |
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