MS21341H
2. During step 3, the meter shall be operated at its minimum operating voltage as specified in Table I of this specification sheet.
MEASUREMENTS DURING CYCLING
1. The meter shall show no evidence of damage and shall not malfunction. (d) Operation at room ambient (25 °C ±5 °C) and 28 VDC for 20 hours ±1 hour.
(e) Hermetic seal.
(f) Insulation resistance.
(g) Sea level dielectric stress (600V RMS, 2 to 5 seconds)
(h) All meters failing one or more of these conformance tests shall be rejected.
12. In addition to the above tests, three sample meters total (any part number) shall be subjected to the following tests every twenty four months.
(a) Salt spray. (b) Vibrations. (c) Shock.
(d) Life. Meters shall be operated at input voltage limits specified in Table I, for 100 hours in each of the following sequences:
(1) Maximum voltage at 125 °C. (2) Minimum voltage at 125 °C. (3) Maximum voltage at -65 °C. (4) Minimum voltage at -65 °C. (5) 28 VDC at room ambient.
(e) Voltage rise time as follows:
(1) Apply a voltage rising from zero to maximum input voltage in: (a) 3 milliseconds maximum
(b) 2 ± .5 seconds
(2) Repeat both (a) and (b) tests five (5) times. (3) The meter shall start in each case.
At the conclusion of these tests, meter readings shall be within the accuracy specified in
Table I. Qualification test.
The qualification tests are to be conducted in accordance with MIL-DTL-7793, except that four (4) sample meters (designated 1, 2, 3 and 4) shall be submitted to Group 1 tests per Table III of this specification sheet. Samples designated 1 and 2 shall be submitted to Group 2 test and samples designated 3 and 4 shall be submitted to Group 3 tests.
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