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I have just bought a CFC250 100 MHz frequency counter, however it did not come with a probe (nor a manual). Below the BNC socket on the front is printed "1M ohm, 40pF". I can find probes with 1M impedance, however they only have 35 pF rating. Would they be ok?
Thank you very much
But lets think about this for a second... it's a frequency counter so its just going to look at the edges. You may be able to use a P2220 or just some BNC to alligator clips if the ringing and reduced sensitivity don't cause false edges.
Interestingly, the counter still works very well - the update speed is a little slower than a new counter, but it is accurate. A testament to Tektronix.
Here are a few photos I took: http://www.flickr.com/photos/tronixstuf ... 700675762/
Quality is remembered long after price is forgotten. I now know which brand of DSO to buy!
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