INCH POUND
MIL-DTL-3971F
18 March 2008
SUPERSEDING
MIL-DTL-3971E
24 January 2001
DETAIL SPECIFICATION
METERS, TIME TOTALIZING, NON-HERMETICALLY SEALED, ELECTRICAL:
GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers the general requirements for electrically operated non-
hermetically sealed meters that automatically measure, and cumulatively register the total
operating or idle time of the circuit, machine or system to which connected.
1.2 Classification. Time totalizing meters covered by this specification are of the following
types and grades (meter class is applicable to type II meters only):
Type I - MIL-DTL-3971/1, Direct current (DC), total capacity: 10,000 hours
Type II - MIL-DTL-3971/2, Alternating current (AC), total capacity, as follows:
Class 1 - 120V, 60 hertz (Hz) - 100,000 hours
Class 2 - 120V, 400 Hz - 10,000 hours
Grade A - With electromagnetic compatibility
Grade B - Without electromagnetic compatibility
1.3 Part or identifying number (PIN).
The PIN is created as specified on the detail
specification sheet.
Comments, suggestions, or questions on this document should be addressed to Defense Supply
Center Richmond, ATTN: DSCR-VEB, 8000 Jefferson Davis Highway, Richmond, VA
23297-5616 or e-mailed to STDZMGT@dla.mil. Since contact information can change, you
may want to verify the currency of this address information using the ASSIST data base at
https://assist.daps.dla.mil.
AMSC N/A
FSC 6645
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