*TB 43-177
APPENDIX A
PROCEDURE FOR CALIBRATION OF STANDARD CELL ENCLOSURES
AT CALIBRATION AND REPAIR CENTERS (CRCs) BASED UPON A TRANSPORT
STANDARD CELL ENCLOSURE AND INTERCOMPARISON DATA
TAKEN BY CRC PERSONNEL
have affected the data. (Example: heavy traffic in
A-1. The CRC will complete one US Army Volt Program
measurement area, changing environment, etc.)
observation sheet (fig. A-1) for each run according to the
following instructions.
A-2. Measurement Instructions
a. CUSTOMER UIC. Enter the six-character user
a. Caution should be exercised when connecting
identification code assigned to your calibration facility.
and disconnecting cells.
Handling of wires and
b. TECHNICIAN. Enter the last name of the
connectors should be minimized to keep thermal EMFs
as low as possible. When observations are begun, there
technician performing the measurements.
should not be extended delays in completing the total
c. INSTRUMENT. Enter the model number of the
observation series. Observations must be made in the
instrument used to obtain the measurements.
order specified by the numbers under the observation
d. DATE. Enter the date the measurements were
blocks on the observation sheet. This conserves the
made.
trend-eliminating feature of the measurement design.
e. RUN NO. Enter the number of the run. (The
first set of data on a cell enclosure is run number 1, the
measure the difference between cell 1 of the transport
second is run number 2, etc.)
standard and cell A of the reference or working group.
f.
ENCLOSURE SERIAL NUMBER. Enter the
Enter the observed value, with proper sign, in
serial numbers for the transport standard and the
observation block number 1 (this is the value of cell 1 -
reference or working group in the appropriate column.
(minus) cell A).
g. NOMINAL TEMPERATURE.
Enter the
c. Move leads from cell 1 to cell 2 of the transport
nominal temperature of each enclosure in the
standard and measure the difference between cell 2 of
appropriate column. (The nominal temperature is the
the transport standard and cell A of the reference or
"set-temperature" of the enclosure and is usually
working group. Enter the observed value, with proper
stamped near the temperature dial or on the nameplate
sign, in observation block number 2 (this is the value of
of the enclosure. Guildline, Model 9154B enclosures
cell 2 - (minus) cell A).
have a nominal temperature of 32C.)
d. Move leads from cell A to cell B of reference or
h. MEASURED TEMPERATURE.
Enter the
working group and measure the difference between cell
measured temperature of each enclosure in the
2 of the transport standard and cell B of the reference or
appropriate column.
(Temperatures should be
working group . Enter the observed value, with proper
measured to the nearest .001C. It is important that this
sign, in observation block number 3 on the second line
data be entered in the proper blocks.)
(this is the value of cell 2 - (minus) cell B).
i.
OBSERVATIONS.
Enter the observed
readings in microvolts. (Resolution should be at least
0.1 V. Example 12.3 V).
j.
REMARKS. Remarks are optional but give the
technician a place to record any conditions that might
A-1
