OPERATION
2-17
separation as it will be when making measurements. Again keep hands or other
objects away from the clips while performing null cal. See the illustration above.
SMD TWEEZERS SMD tweezers present a challenge to calibrate accurately, since their position can
vary and the operators hands are always present when making measurements.
Use a piece of copper (shorting block) about the same dimensions as the devices
to be measured, as the shorting wire. DO NOT just touch the tips together. A
shorting block can be made from an SMD device by connecting the two ends with
copper tape or solder to create a short circuit. When performing open circuit cal,
hold the tips about the same distance apart as they will be when measuring parts
and keep your hands still. Sometimes it is valuable to check the "quality" of the
null calibration by measuring the part that was used to perform the null cal (the
shorting block). If the residual error is larger than the measurement can tolerate,
it may be necessary to re-do it until an acceptable calibration is achieved.
Other Fixtures In general, follow the procedure for performing null cal as described above. Use a
configuration similar to one that will be used when making measurements and
keep any random objects far away.
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