u. The sequence of measurement for the balances in Figures 5A, and 9 are
check zero, weigh, and read the results.
drum have stops which let you know that you have turned them to their zero
positions. After zeroing the digitizer or micrometer, you release the pan inside
the balance by rotating the arrestment knob (not shown) to the released position.
The zero procedure is complete after you rotate the zero knob until the zero line
of the optical scale is centered in the reference gap.
Type 21 Analytical Balance
v. When you start the weighing procedure, you should arrest the beam and load
the pan. The access doors and the pan we have referenced can be seen in Figure 6.
In both models of the balance, the arrestment knob is turned to its PART REL
position while the movement of the pan is watched.
If the pan swings, turn the
arrestment knob back and forth several times between the PART REL and RELEASED
positions until the swinging stops. During the weighing process, you turn each of
the knobs (10G, 1G, and 0.16G) from 0 to 10-20-30 until the "remove weight" appears
in the read-