TB 9-6670-254-50
return balance to equilibrium. if weights are added to pan containing the standard, then
weight value of TI is equal to total of standard and one half the added weight values from
primary test report. If weights are added to pan containing TI, then weight value of TI is
equal to difference of standard, and one half the added weight values from primary test
report. The additional weight required will not exceed tolerance listed in the appropriate
tolerance table. If tolerance is exceeded, perform b below (R).
(5) Repeat (1) through (4) above for each weight being calibrated, using tolerance
listed in appropriate tolerance table.
b. Adjustments.
Adjust weight, using appropriate procedure of
paragraph 14 below.
9. Direct
Weighing-Single Pan
Balance
a. Performance Check
(1) Lock dials on balance (A2) and zero adjust balance.
NOTE
A false zero will result if dials are between any two numbers.
(2) Place standard weight (A7 through A11) (of value corresponding to value of TI)
on balance pan.
(3) Dial weights on balance until indication is on scale (IN-RANGE marker is
illuminated). Record weight reading.
NOTE
If necessary, to bring balance in range and illuminate the
automatic milligram scale IN-RANGE marker, the same
amount of incremental weight may be added to pan for both
weightings. For larger differences, between standard and TI, a
standard weight may be added to lighter weight to bring
balance in range.
(4) Remove standard weight.
(5) Place TI on balance pan and record weight reading. If value read for TI is
greater than the standard (recorded in (3) above), add difference to weight value of
standard from primary report to obtain calibrated value of TI. If value read for TI is less
than standard, subtract difference from standard weight value. Weight difference will not
exceed tolerance listed in appropriate tolerance table. If tolerance is exceeded, perform b
below (R).
(6) Repeat (2) through (5) above f or each weight being calibrated, using tolerance
listed in appropriate tolerance table.