Learning Event 4:
DESCRIBE MEASUREMENTS FOR CALIBRATION OF STANDARD CELL ENCLOSURES AT ARMY
CALIBRATION FACILITIES
1.
In the preceding learning event, the US Army Volt program was
described.
In this learning event the measurement procedures for the
calibration and surveillance of standard cell enclosures will be described.
The data that is collected from these measurements is computed using a set
of formulas that will determine the validity of the surveillance and
calibration, however, the actual computation of these formulas is beyond the
scope of this subcourse and will not be covered. They will be covered in
the Army Calibration Laboratory Procedures subcourse.
This subcourse is
only concerned with the measurement procedure required to obtain the data to
be used with the formulas.
2.
When performing the standard cell measurements the ACF will complete
one US Army Volt Program observation sheet (fig 3-4) for each run according
to the following instructions:
a. Customer UIC.
Enter the six-character unit identification code
assigned to your calibration facility.
b. Technician.
Enter the last name of the technician performing the
measurements.
c. Instrument.
Enter the model number of the instrument used to obtain
the measurements.
d. Date.
Enter the date the measurements were made.
e. Run number.
Enter the number of the run. (The first set of data
on a cell enclosure is run number 1, the second is run number 2, etc.)
f. Enclosure serial number. Enter the serial numbers for the transport
standard and the lab standard in the appropriate column.
g. Nominal temperature.
Enter the nominal temperature of each
enclosure in the appropriate column. (The nominal temperature is the "set-
temperature" of the enclosure and is usually stamped near the temperature
dial or on the nameplate of the enclosure.) Guildline, Model 9154B
enclosures, have a nominal temperature of 32C.
h. Measured temperature.
Enter the measured temperature of each
enclosure in the appropriate column.
(Temperatures should be measured to
the nearest .001C. It is important that this data be entered in the proper
blocks.)
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 have affected the data. (Example: heavy
traffic in measurement area, changing environment, etc.)
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