MIL-M-23167B(SHIPS)
(e) Manufacturer's name or trade mark (or symbol), or both. (f) Manufacturer's model number.
(g) Manufacturer's serial number. (h) Federal stock number.
3.18 Burden. Design of expanded scale circuit shall be such as to require a minimum amount of energy to energize the meter. Burden shall not exceed 7.5 volt-amperes.
3.19 Performance. Basic initial accuracy of meters shall not exceed 0.05 percent (0.2 Hz) within the scale span of 398 to 402 Hz and 0.1 percent (0.4 Hz) at all other scale points. Permissible errors are listed in table I in absolute values for the respective reference conditions.
# Table I - Permissible errors, Hertz
Condition |
Scale spans |
|
398 - 402 Hz |
395 - 398 402 - 405 Hz |
|
Initial accuracy Voltage range On-off cycling Overvoltage External field influence Inclination Temperature range Harmonic content: 3% single harmonic 4% single harmonic 5% single harmonic Vibration Shock (high-impact) |
0.2 .4 .2 .2 .2 .2 .4 .1 .2 .3 .4 .6 |
0.4 .8 .4 .4 .4 .4 .8 .2 .4 .6 .8 1.2 |
3.20 Workmanship. Meters shall be manufactured in a careful manner in accordance with good design and sound practice. The interiors of meters shall be free from metal filings, grease or oil, foreign material, dust or other loose particles which may interfere with normal operation of the meter.
4. QUALITY ASSURANCE PROVISIONS
# 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.
4.1.1 Classification of tests. The methods of sampling, examination and tests conducted on frequency meters shall be classified as follows:
(a) Qualification (see 4.3).
(b) Quality conformance (see 4.4).
4.2 Test conditions.
4.2.1 Atmospheric conditions for qualification tests. Unless otherwise specified herein, qualification tests shall be made at ambient temperatures of 23° to 27° Centigrade (C.) at existing barometric pressure, and with relative humidity of between 40 to 60 percent.
4.2.2 Quality conformance tests. Unless otherwise specified herein, all quality conformance tests shall be made at ambient temperature of 20° to 30°C. with a relative humidity of less than 80 percent.
4.2.3 Position. Unless otherwise specified herein, tests shall be conducted with the frequency meter in the position in which it is normally used.
4.2.4 Tapping. When taking readings, either the meter or its support shall be tapped lightly, except for ascertaining the effect of friction after the vibration test.
Source: https://assist.dla.mil -- Downloaded: Check the source to verify that thi5s is the current version before use.
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