1、AMSC N/A FSC 6645 INCH-POUND MS27650G 19 October 2012 SUPERSEDING MS27650F 17 August 1973 DETAIL SPECIFICATION SHEET METER, TIME TOTALIZING, HERMETICALLY SEALED, 26 V 400 Hz This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acqu
2、iring the product described herein shall consist of this specification sheet and MIL-DTL-7793. FIGURE 1. Meter configuration. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27650G 2 FIGURE 2. Alternate meter configuration. NOTES: 1. Dimensions are
3、 in inches. 2. Unless otherwise specified, tolerance is .02 for two place decimals and .005 for three place decimals 3. For design feature purposes, this specification sheet takes precedence over the documents referenced herein. 4. Referenced documents shall be of the issue in effect on the date of
4、invitation for bid. 5. Optional radius applies to all corners and edges. 6. Exposed tin plate on this surface of mounting flange only, per ASTM-B545, to provide an electrical ground for the case. 7. Marking surface is optional. Marking must not be obscured by mounting bracket. Provided by IHSNot for
5、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27650G 3 TABLE I. Mounting hole code letter. Code Letter Mounting Holes Applicable Figure A NO. .112-40 UNC-2B Tapped Holes 1 B NO. .112-40 UNC-2B Tapped Holes 1 (with flange rotated 90) C .125 DIA Clearance Holes 1 D .125
6、 DIA Clearance Holes 1 (with flange rotated 90) E NO. .112-40 UNC-2B Tapped Holes 2 F NO. .112-40 UNC-2B Tapped Holes 2 (with flange rotated 90) G .125 DIA Clearance Holes 2 H .125 DIA Clearance Holes 2 (with flange rotated 90) REQUIREMENTS: 1. Dimensions. See Figure 1or Figure 2, as applicable. 2.
7、Electrical. Unless otherwise specified, all tests shall be at room pressure and temperature, approximately +23 C. All voltages shall be in accordance with MIL-DTL-7793, except voltages shall be 23, 26, or 29 volts in lieu of 102, 115, or 128 volts, respectively, where applicable. 3. Meter range. 0 t
8、o 10,000 hours, meter will read 9999 maximum. 4. Scale designator. Hours 5. Mounting flange. The surface of the mounting flange shall be tin plated per ASTM-B545, 0.0002 to 0.0004 inch thick to provide electrical ground for case (see figures 1 and 2). 6. Input power. The input power shall be 1.0 wat
9、t nominal, 1.5 watts maximum. 7. Input voltage. The input voltage shall be 26 volts 3 volts, single phase. 8. Frequency. The frequency shall be 400 20 Hz. 9. Current. The current shall be 60 milliamperes maximum. Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
10、om IHS-,-,-MS27650G 4 10. Accuracy. Accuracy shall be 0.1 percent or 1 hour, whichever is greater. Note: Accuracy is degraded at the same percent as the percentage change in input frequency plus the specified accuracy tolerance. 11. Weight. The weight shall be a maximum of 0.7 ounce. 12. Transient p
11、rotection. No temporary or permanent degradation or other malfunction shall be produced in the time totalizing meter if the input voltage should increase to +41 Vrms at 320 to 480 Hz for a period of 150 mlliseconds maximum. 13. Case finish. The case shall be finished in a durable, dull or semi-gloss
12、 black color. 14. Marking. The meter shall remain clearly and legibly marked with the following information after subjection to the environmental requirements: (a) Part number, MS27650 (and dash number from Table II and mounting hole code letter from Table I). Example: MS27650-01. (b) Source and dat
13、e code per MIL-STD-1285. (c) Nominal voltage and frequency. TABLE II. Dash numbers and dimensions. Dash Number DIM. A .015 Dash Number DIM. A .015 -01 .000 -14 .406 -02 .031 -15 .438 -03 .062 -16 .469 -04 .094 -17 .500 -05 .125 -18 .531 -06 .156 -19 .562 -07 .188 -20 .594 -08 .218 -21 .625 -09 .250
14、-22 .656 -10 .281 -23 .688 -11 .312 -24 .719 -12 .344 -25 .750* -13 .375 -26 .781* * Does not apply to figure 2. 15. Conformance inspection. The following tests, run in the order shown on all meters, supersede the individual tests and sampling Plans A and B specified in MIL-DTL-7793. The maximum met
15、er reading at the time of delivery shall be 0001. (a) Examination of product. (b) Operational check. Ten operations for instant starting at room temperature, approximately 25C. Five of these ten operations at 29 V, 380 Hz and the other five operations at 23V, 420 Hz. Provided by IHSNot for ResaleNo
16、reproduction or networking permitted without license from IHS-,-,-MS27650G 5 (c) Thermal shock per MIL-STD-202, Method 107, test condition B, modified as follows: Test conditions: 1. The meter shall be operated at 29V, 380 Hz during Step 1. 2. The meter shall be operated at 23V, 420 Hz during Step 3
17、. MEASUREMENTS DURING CYCLING 1. The meter shall show no evidence of damage and shall not malfunction. (d) Operation at room ambient temperature (approximately 25 C) and 26 V, 400 Hz for 20 1 hours. (e) Hermetic seal. (f) Insulation resistance. (g) Sea level dielectric stress (600V RMS, 2 to 5 secon
18、ds) (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 two years. (a) Salt spray. (b) Vibration. (c) Shock. (d) Life. (1) High voltage at high
19、 temperature (100 Hours) (2) Low voltage at high temperature (100 Hours) (3) High voltage at low temperature (100 Hours) (4) Low voltage at low temperature (100 Hours) (5) 26 Volts at room ambient. (approximately +25 C) (100 Hours) 500 Hours At the conclusion of these tests, meter readings shall be
20、within the specified accuracy. 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 shal
21、l be submitted to Group 2 tests and samples designated 3 and 4 shall be submitted to Group 3 tests. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27650G 6 TABLE III. Qualification tests. Test Requirement Paragraph Test Paragraph Group 1 Examinati
22、on of product 3.8.1 Visual examination (4.4.1) 3.7.2 3.7.3 3.7.6 3.9 Operational check 3.8.2 4.4.2 Group 2 Power supply tolerance 3.8.4 4.4.4 Insulation resistance 3.8.5 4.4.5 Dielectric strength 3.8.6 4.4.6 Altitude 3.8.7 4.4.7 Thermal shock 3.8.8 4.4.8 Moisture resistance 3.8.9 4.4.9 Salt spray 3.
23、8.10 4.4.10 Vibration 3.8.11 4.4.11 Shock 3.8.12 4.4.12 Hermetic seal 3.8.13 4.4.13.1 Group 3 Life accuracy 3.8.14 4.4.14 Electromagnetic compatibility 3.8.15 4.4.15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27650G 7 6. Changes from previous
24、issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes. Referenced documents. In addition to MIL-DTL-7793, this specification sheet references MIL-STD-202, MIL-STD-1285, and ASTM-B545. Custodians: Preparing acti
25、vity: Navy - AS Navy - AS Air Force - 99 (Project 6645-2012-021) DLA - GS1 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
