Page 156 - Testing Electronic Components

to cold ground and the red probe to the crystal pins. Make sure your
frequency counter meter has the range that is higher than the crystal
frequency you are checking.

If the crystal is 8 MHz then your meter should have the range to be able
to check that frequency. Assuming the readout of the crystal is 2.5 MHz
then you know that the crystal is not functioning well and need to be
replaced. Normal digital multimeter usually has a small range for
checking frequency. However the digital meter (Greenlee brand) that I’m
using is able to measure up to 24 MHz. You can read the specification of
your meter manual and see how high is the range is.

Frequency counter in a digital multimeter

156