*TB 43-177
Table 1. Minimum Specifications of Equipment Required
Item
Common name
Minimum use
Manufacturer and model
specifications
(part number)
Range: 0.0 to 10000.0 V
A1
POTENTlOMETER
Guildline, Model 9931/9771
Resolution: 0.1 V
(MIS-10416)
A2
STANDARD CELLS W/
Range: 1.018 V nominal
Eppley, Model 106-4
Accuracy: 3 V with
TEMPERATURE
(7909096) or Guildline,
ENCLOSURE
calibration
Model 9154 (MIS-10364)
report
A3
VOLTAGE REFERENCE
Range: 1.018 V
John Fluke, Model 730A/AB
Stability: 2 V per hour
STANDARD
(MIS-10358)
Table 2. Accessories Required
Item
Common name
Description
(part number)
1
B1
WIRE CONDUCTOR
Shielded pair, solid conductor, untinned
SHIELDED PAIR
copper (MIS-10312)
B2
GALVANOMETER
Guildline, Models 9460/9461 or 5214-SR21
(7907452)
1
Fabricate to length; approximately 6 feet per unit length with common joined at junction and insulated. Junction to be
formed in a fashion to yield minimum thermal EMF.
be checked and recharged as necessary to bring them to
7.
Procedure
a full-charge condition. The battery charge switch should
be placed in the "Lo-Charge" position during normal
a.
Calibration of Cells at the CRC
operation.
(3) The transport standard shall be allowed to
(1) Program schedules, methods of shipping
stabilize in the laboratory environment for at least 24
the transport standards, observation forms, and data
hours before observations are begun. The first set of
transmission instructions will e controlled by the APSL to
observations will then be made using instructions of
assure calibration of the CRC standard cell as required
by TB 43-180. Program intervals nay be shortened or
for a four-cell by four-cell comparison which consists of
extended by the APSL to satisfy emergency needs or to
16 observations taken in the order specified in the
meet individual requirements.
observation sheet (fig. A-1, Appendix A). A series of
(2) Upon receipt of the transport standard at
eight observations will be taken with cells connected as
the CRC, it shall be inspected while on battery power to
in figure A-2 of appendix A, and a series of eight
ascertain that it is maintaining operating temperature
observations will be taken with cells connected as in
(periodic cycling of front panel meter). If front panel
meter does not cycle, contact the APSL for guidance. If
confusion in the measurement process, the transport
periodic cycling is evident, the transport standard shall
standard cells are designated 1 through 4 and the
then be connected to 115-V ac line power in the
laboratory standards A through D.
laboratory environment area in which measurements are
to be made. The batteries of the transport standard shall
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