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

*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

b. Connect equipment as shown in figure A-2 and

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.

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 32°C.)

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 .001°C. 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).

OBSERVATIONS.

Enter the observed

readings in microvolts. (Resolution should be at least

0.1 µV. Example 12.3 µV).

REMARKS. Remarks are optional but give the

technician a place to record any conditions that might

A-1