*TB 43-177
The first set of observations shall be transmitted to the
sample table B-3 of appendix B and in accordance with
APSL immediately for analysis to determine a go or no-
(a) through (c) below:
go condition for the transport loop.
(a) A go-condition will be assumed by the
(a) Enter the calibration report value for
CRC and intercomparisons shall continue at a rate of not
each of the cells and the mean of each group at the
less than two per week until notification by the APSL.
appropriate point on the graphs at time zero and enter
(b) If a no-go condition exists, the APSL will
the date at the bottom of the graph.
advise the CRC to discontinue the observations and will
(b) Enter the upper and lower control
provide further instructions as necessary.
limits. These limits will be supplied by the APSL in the
(c) Data sheets will be mailed directly to the
calibration report.
APSL, ATTN.: AMXTM-SE.
(c) At
monthly
intervals
following
(4) Upon completion of the observations at
calibration, use the technique of appendix A and
the CRC and return of the transport standard to the
compare the reference and working cells. Use the
APSL, the cell values shall be redetermined with respect
technique of appendix B and compute the value of all
to the US Army Volt. If this redetermination and the CRC
cells in terms of the mean of the reference group. Enter
intercomparison data are conclusive, a test report and
the computed data in the graphs.
DA Label 80 will be completed and transmitted to the
(4) Surveillance plots are considered within
CRC calibrating the enclosure(s).
control if plotted data is within upper and lower control
(5) If upon return of the transport standard to
limits.
the APSL, either the cell value redetermination or the
(5) Out-of-control conditions and actions will
observation data are found to be inconclusive, a
be determined in the following manner:
rescheduling for calibration will be made and the
procedure repeated.
(a) The average left-right component
(residual EMF) is 0.10 V for systems used in the CRCs.
b. Internal Surveillance of the CRC Saturated
Any computed left-right component exceeding 0.30 V
Cells
(1) Surveillance of the reference and working
indicates a requirement for determining system errors
groups of cells will be maintained by the method outlined
(sources of thermal EMF, cell instability, potentiometer
in appendix B. Surveillance will consist of monthly
errors, etc.). In situations where left-right component
comparisons of the reference and working cells and
computations exceed 0.30 V and the sources of errors
plotting the computed value of each cell and the mean of
cannot be traced locally, guidance should be requested
the groups.
from the APSL.
(2) The following computations and graphs
(b) Control limits on the surveillance
are required:
charts signal out-of-control conditions for the cell.
(a) The value of each cell and the mean
Individual out-of control cells in the working group should
of the working group based on the mean of the reference
not be used as standards for calibration; however,
group (compute and graph).
surveillance should continue.
In some cases, the
(b) The value of each cell in the
condition will be temporary and will return to an in-control
reference group based on the mean of the reference
condition. In the event of an out-of-control working group
group (compute and graph).
mean, request guidance from the APSL. The reference
(c) Left-right component (compute only).
group mean will track a straight line by definition. In the
(d) The data sheets of the monthly
event as many as two reference group cells drift out-of-
comparisons of the reference and working cells used to
control, request guidance from the APSL.
compute a, b, and c above.
(3) Upon receipt of the calibration report from
the APSL, the CRC will construct graphs similar to
5 (6 blank)
