a. The US APSL will schedule, disseminate, and assign the values to the
ACF voltage standards.
b. The ACFs, using saturated standard cells, will obtain and transmit
the data as required to implement the program.
4.
To implement the procedure for the calibration of cells at the ACF,
the program schedules, methods of shipping the transport standards,
observation forms, and data transmission instructions will be controlled by
the APSL to assure calibration of the ACF standard cell as required by
TB 43-180. Program intervals may be shortened or extended by the APSL to
satisfy emergency needs or to meet individual requirements.
a. Upon receipt of the transport standard at the ACF, it shall be
inspected while on battery power to ascertain that it is maintaining
operating temperature (periodic cycling of front panel meter).
If front
panel meter does not cycle, contact the APSL for guidance.
If periodic
cycling is evident, the transport standard shall then be connected to a
115-V ac line power in the laboratory environment area in which measurements
are to be made. The batteries of the transport standard shall be checked
and recharged as necessary to bring them to a full-charge condition. The
battery charge switch should be placed in the "Lo-Charge" position during
normal operation.
b. The transport standard shall be allowed to stabilize in the
laboratory environment for at least 24 hours before observations are begun.
The first set of observations will then be made using a typical format for a
4-cell by 4-cell comparison which consists of 16 observations taken in the
order specified in the observation sheet (fig 3-4).
A series of 8
observations will be taken with cells connected as in Figure 3-5, and a
series of 8 observations will be taken with cells connected as in Figure
3-6. For clarity and to eliminate confusion in the measurement process, the
transport standard cells are designated 1 through 4 and the laboratory
standards A through D. The first set of observations shall be transmitted
to the APSL immediately for analysis to determine a go or no-go condition
for the transport loop.
(1) A go-condition will be assumed by the ACF and intercomparisons
shall continue at a rate of not less than two per week until notification by
the APSL.
(2) If a no-go condition exists, the APSL will advise the ACF to
discontinue the observations and will provide further instructions as
necessary.
(3) Data sheets will be mailed directly to the APSL.
c. Upon completion of the observations at the ACF and return of the
transport standard to the APSL, the cell values shall be redetermined with
respect to the US Army Volt.
If this redetermination and the ACF
intercomparison data are conclusive, a test report and DA Label 80 will be
completed and transmitted to the ACF calibrating the enclosure(s).
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