piclist 2002\08\12\095553a >
Thread: What Test Gear to measure xtal frequency to 1Hz
face BY : Jim email (remove spam text)

I have used a high-gain pre-amp in front of a
counter before and simply contacted the crystal
can and picked up enough signal to cause the
counter to count. Alternatively one can often
simply come close to one of the osc pins (w/o
touching) and also get enough signal wwith an
appropriate pre-amp before the counter.

The other technique would involve an HF (some call them
"shortwave") receiver tuned in and around 12 MHz while
listening using a short piece of wire connected to the
antenna input laying in the vicinity of the osc circuit.

The procedure involves tuning for about a 1 KHz tone
using the BFO (or Upper Sideband) and then zero-beating
an external signal generator against this 1 KHz tone
produced by the 12 MHz osc.

Using this technique I have been able to measure the
frequency of stations off-the-air to the limits of the
generator I was using (which was capble of 1 Hz steps).

RF Jim

{Original Message removed}
<003801c24207$e4556080$0100a8c0@piii500a> 7bit

See also: www.piclist.com/techref/timers.htm?key=xtal
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Subject (change) What Test Gear to measure xtal frequency to 1Hz

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