One method we use for this measurement is a specially designed carrier
with (4) glass plates in slots held down by spring clamps.  These plate
glass pieces are removable.  The following steps are then taken:
        1) We will wash the plate glasses and pallet.
        2) Weigh the (4) glass plates separately and record the weight.
        3) Assemble the glass plates into the pallet.
        4) Run the pallet down the wave solder machine (chip wave and
wave bath are off)
        5) Remove the glass plates and weigh in the scale.  Record the
data.

The scale is measuring (or attempting to measure) micrograms.  We use a
Ainsworth 1000 scale (which run approximately ($70,000).  We will run
several tests to see if it is repeatable and consistent.

Hope this helps.

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