MIL-DTL-3971/2E
1.6 Stopping. The meter shall stop within 120 seconds after being de-energized.
1.7 Power supply tolerance.
60 Hz meters one-half hour at 115 volts, 50 Hz
4 hours at 120 volts, 60 Hz
one-half hour at 128 volts, 70 Hz
400 Hz meters one-half hour at 115 volts, 300 Hz
4 hours at 120 volts, 400 Hz
one-half hour at 128 volts, 500 Hz
1.8 Part or identifying number (PIN). The part number consists of the basic number of this
specification sheet and a dash number taken from table I.
Example:
M3971/2-1-S
Basic number
Specification sheet number
Dash number from Table I
B (blade) or S (stud) terminal
configuration
Note: Specify terminal configuration; wire lead (blade) or terminal block (stud).
2.0 Changes from previous revision. The following changes were made to this document:
a. "CPS" changed to "Hz" at 2 places in title.
b. power consumption requirement was removed, had been "Not applicable".
c. Para. 1.5 statement on "rated voltage and frequency" and the start time
requirement added.
d. Para. 1.7 tolerance data revised.
e. Para. 1.8 paragraph title changed from "Part number". Added blade/stud
designation to PIN.
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