1、MIL-M- 19261(SHLps) 4 Apri 1956 MILITARY SPECIFICATION METER, POWER FACTOR 4-1/2 INCH, SWITCHBOARD TYPE 1. SCOPE 1.1 This speclfication covers 4-1/2 inch rectangular, 250 degree scale, single and 2 APPLICABLE DOCUMENTS 2.1 The following specifications and standards, of the issue in effect on date of
2、 invitation or bids, form a part of this specifictation. polgphase, shockproof power factor meters. SPECIFICATIONS FEDERAL NN-E591 - Boxes, Fiberboard, Wood-Cleated (for Domestic Shipment). NN-B-621- Boxes, Wood, Nailed and Lock-Corner. LLL-B-631 - Boxes; Fiber Corrugated (for Domestic Shipment). LL
3、L-B-636 - Boxes, Fiber, Solid, (for Domestic Shipment). PPP-B-601- Boxes, Wood-Cleated-Plywood. MILITARY JAN-P-72 - Primer, Synthetic Lacquer-Resisting, MIL-B-80 - Plastic Sheet, Acrylic Base, Antielectrostatic, Transparent, (for Indicator Dial Windows). JAN-P-103 - Packaging and Packing for Oversea
4、s Shipment - Boxes, Wood-Cleated, Solid Fiberboard. JAN-P-106 - Packaging and Packing for Overseas Shipment - Boxes, Wood Nailed. JAN-P-108 - Packaging and Packing for Overseas Shipment - Boxes, Fiberboard (V-Board and W-Board) Exterior and interior. MIL-P-116 - Reservation; Methods of. MIL-C-490 -
5、Cleaning and Preparation of Ferrous and Zinc Coated Surfaces for Organic Protective Coatings. JAN-P-735 - Primer, Paint, Zinc-Chromate Alkyd Type. MIL-S-901 - Shockproof Equipment, Class HI (High-Impact), Shipboard MIL-E-917 - Electric Power Rqquipment; Equipment for (Naval Shipboard Use). MIL-S-233
6、 - Screws, Machine, Cap and Set; and Nuts. MIL-1-1361 - Instruments, Electrical Measuring, Shunts, Resistors, and Transformers (Ship and Shore Use). MIL-E-2036 - Enclosures for Electric and Electronic Equipment MIL-S-6872 - Soldering Process; General Specification for. MEL-P-6889 - Primer, Zinc-Chro
7、mate, for Aircraft Use. MIL-B- 10377 - Boxes: Wood-Cleated, Veneer, Paper Overlaid. MIL-L-10547 - Liners; Case, Waterproof. Application Tests for. (Naval Shipboard Use). FED. SUP. CLASS THIS DOCUMENT CONTAINS PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license
8、 from IHS-,-,-MIL-M- 19261(SHIPS) MILMXZY (contd. ) MILI- 15024 - Identification plates, Information Plates and Marking Infor mat ion for Identifica tion of Electrical, Electronic , and Mechanical Equipment. MIL-E-15090 - Enamel, Equipment, Light-Gray (Formula No. 111). MIL-(2-16328 - Coating, Pretr
9、eatment, (Formula No. 117 for Metals). General $pecifications for Inspection of Material, NAW DEPARTMENT STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by MIL-STD-108 - Definitions of and Basic Requirements for Enclosures MIL-STD-129 - Marking for Shipment and Storage
10、. MIGSTD-167 - Mechanical Vibrations of Shipboard Equipment. Attributes. for Electric and Electronic Equipment. (Copies of specifications, standards, drawings, and publications required by contractors in connectlon with specific procurement functions should be obtained from the procuring agency or a
11、$ directed by the contracting officer.) otherwise indicated the issue in effect on date of invitation for bids shall apply. 2.2 Other publications. - The following documents form a part of this specification. Unless CONSOLIDATED CLASSIFICATION COMMJ!TTEE (Application for copies shouid be addressed t
12、o the Consolidated Classification Committee, NATIONAL BUREAU OF STANDARDS PUBLICATION (Applicationfor copies should be addressed to the Superintendent of Documents, Government 3. REQUIREMENTS Consolidated Freight Classification Rules. 202 Chicago Union Station, Chicago 6, IL) Handbook H28 - Screw Th
13、read Standards for Federal Services. Printing Office, Washington 25, D. C.) 3.1 Qualification. - Power factor meters furnished under this specification shall be a product which has been tested and has passed the qualification tests specified herein (see 6.3). 3.2 Definitions. - 3.2.1 Power factor me
14、ter. - A power factor meter is an electrical instrument which visualy indicates the present value of the relation between true power (watts) and apparent power (volt- amperes) and also indicates whether the current is lagging or leading the voltage. 3.2.2 Accuracy rating. - The accuracy rating desig
15、nates the accuracy classification of the power factor meter. It is given as the limit, expressed as a pure number (decimal fraction) repre- senting a percentage of a given length of scale, which errors wiii not exceed when the meter is used under reference conditions. equipment built into the case o
16、r made a corporate part thereof. t 3.2.3 Self-contained meter. - A self-contained meter is a meter which has all the necessary 2 _ -7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-N-37263 66 W 777770b 0327733 9 MIL-M- 192.61 (SHIPS) 3.2.4 Mecha
17、nism. - Ths mechanism is the arrangement of parts for producing and controlling the motion of the indicating means. It includes all the essential parts necessary to produce these results, but does not include the base, cover, dial, or any parts, such as series resistors or shunts, whose function is
18、to adapt the meter to the quantity to be measured. 3.2.5 Moving element. - The moving element of a meter comprises tho.se parts which move as a direct result of a variation in the electrical quantity which the meter is measuring. The weight of the moving element includes one-haif the weight of the s
19、prings. 3.2.6 Voltage circuit. - The voltage chcuit is that combination of conductors and windings of the meter to which is applied the voltage of the circuit in which a given electrical quantity is to be measured, or a definite fraction of that voltage, or 8 voltage or current dependent upon ita 3.
20、2.7 Current circuit. - The current circuit is that combination of conductors and windings of the meter which carries the current of the circuit in which a given electrical quantity is to be meas- ured, or a definite fraction of that current, or a current dependent upon it. 3.2.8 Mluence. - The influ
21、ence of a specified variable or condition of a meter b the change in the indication of the meter caused solely by a departure of the speclfied variable from its reference value, ali other variables being held constant. 3.2.9 Scale len h The scale length of a meter is the length of the path described
22、 by the indi- cating means _717 or t e tip o the pointer in moving rom one end of the scale to the other. in the case of knife-edge pointers and others extending beyond the scale division marks, the pointer shall be considered as ending at the outer end of-the shortest scale division marks. 3.2.10 D
23、ampin Damping of a meter is the term applied to its performance to denote the manner in wlZXFrom the horizontal centerline. Under these conditions there shall be no objection- able shadow on the graduated scale. -. 5 e- - Provided by IHSNot for ResaleNo reproduction or networking permitted without l
24、icense from IHS-,-,-.- 3.5.6 Dial and pointer. - 3.5.6.1 Dial. - The dial shall be made of stiff material firmly secured to its mounting and readily removable. The dial shall be of such material and so secured as to insure freedom from warping, fading, or other deterioration during the tests specifi
25、ed herein, Paper dials will be satis- facory only when adequately bonded to and backed by a metal support and when they meet all tests specified herein without fading, discoloring, warping, or other deterioration. 3.5.6.2 Pointer. - The meter shal have a pointer so formed as to permit accurate readi
26、ngs at the usual dlstancefrom which the meter is viewed, and approximate readings up to the distance of legibility of the scale markings. The pointer shall be of rigid construction and suitable for the intended application, and shall not become damaged or distorted when subjected to any of the tests
27、 specified herein. avoiding errors in reading due to parallax, the clearance between the pointer index and the gradu- ated scale shall not exceed O. 10 inch, nor be less than 0.03 inch. 3.5.6.2.1 Pointer clearance (parallax), - Where the meter is not provided with means for 3.5.7 Means of adjustment
28、. - 3.5.7.1 Accuracy adjustment. - Meters shall be provided with practical shop means of adjust- ment to accuracy. Charging of the magnet and magnetically treating it to obtain accuracy, or adjusting the internal resistor, shall be considered as meeting this requirement. 3.5.8 Terminal studs. - Term
29、inal studs shall be firmly anchored to the base of the meter in such a manner as to prevent turning or movement sufficient to cause damage to internal construc- tion, Each terminal stud shall be furnished with the necessary nuts or screws, and washers. 3.5.9 Connection diagrams. - Meters having more
30、 than one circuit shall have a print showing the wiring diagram of connections with or without transformers, resistances, and reactances for three-phase three-wire systems and two-phase four-wire systems, together with instructions attached permanently or sufficiently secured to prevent loss during
31、shipment. ing to Specification MIL-1-15024. All meter rating information shall be indicated on the identifica- tion plate. Plastic identification plates shall not be used when the plate is to be attached to other than a flat surface. 3.5.10 Identification plates. - The meter shall be provided with a
32、n identification plate conform- 3.5.11 Self-contained limitations. - Power factor meters shall be seif-contained at current ratihgs of 20 amps or less. External accessories may be used for all potential ranges. 3.5.12 Mounting. - Switchboard meters shaii be mounted by means of mounting bolts or stud
33、s. The necessary mounting bolts (screws), nuts, and lock washers shall be supplied with each meter. . The meters shall be mounted on a panel drilled in accordance with the panel-drilling specified (see 3. 5.14), m resistance for switch- board meters. 4.3.2 Failures. - One failure will be permitted o
34、n a sample of power factor meters under the following conditions: (a) The failure is limited to one of the following tests: (1) Position influence (balance). (2) Rated accuracy. (3) Damping factor. (4) Response lime. (b) The magnitude of the failure-is limited to 1-1/2 times the specified tolerance
35、for the rated-accuracy test, and 2 times the specffied tolerance for the other three tests. 4.4 Inspection. - Inspection shall be performed at the place of manufacture by the Government or under the direction of the Government. 4.4.1 Lot. - All power factor meters of the same design offered for deli
36、very at one time shall be considered a lot. 10 -. . - _. - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-3726L 66 7777706 0327723 3 MIL-M- 19261(SHLps) 4.4.2 Sampling for group A tests. - Statistical sampling for group A tests shall Le in acc
37、ord- ance with Standard MIL-STD-105. Major and minordefects shall be as defined in Stand- ard MIL-STD-105 and the Acceptable Quality Level (AQL) shall be as specified in 4.5.1. 4.4.3 Sampling for group B tests. - Group B tests shall be performed on sample units that have been subjected to and have p
38、assed the group A tests, unless the Government considers it inore practical to select a separate sample from the lot for group B tests. The sampling procedure shall be in accordance with Inspection Level L7 of appendix to Standard MIL-STD-105. The Acceptable Quality Level (AQL) shall be 6.5 percent.
39、 of the quantity shall be selected for the group C tests. 4.4.4 Sampling for group C tests. - One sample power factor meter from each lot regardless 4.5 Lot acceptance inspection. - 4.5.1 Group A tests. - Each of the sample power factor meters selected in accordance with 4.4.2 shall be subjected to
40、each of the tests specified in table I; Table I - Group A tests. : Require- : : ment : Test : AQL (percent : Test : para- : paragraph : defective) : : Maior Minor : : graph : ; . : Viswl and mechanical : : inspectioii (without . : opening case) : Section 3 : 4.6.1 : 1.0 : 4.0 : : Position influence
41、(bal- : : Ratea accuracy : ances) : 3.6.2 : 4.6.2 : 1.0 : - : : 3.6.2 : 4.6.3 : 4.5.2 Group B tests. - Samples selected in accordance with 4.4.3 shall be subjected to each of the tests specified in tabie II. Failure to conform to this specification for any group B test shall be counted as a defect.
42、If the number of defective units exceeds the applicable acceptance number, the lot shall be rejected. . 11 -7 I . -. . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-17261 bb 777770b 0127722 5 W I MIL-M- 19261(SHzI?s) 4.5.2.1 if a lot is rejec
43、ted due to failure to pass group B tests, the manufacturer may rework the lot or screen out defectives and resubmit it for Government inspection. Resubmittal lots shall be kept separate from new lots. The resubmitted lot shall be inspected, using Inspection level L7 of appendix to Standard MIL-STD-1
44、05. Sample units which have been subjected to and have passed the group B tests shall be subjected again to the rated accuracy test. I Table II - Group B tests. : Requirement : Test : paragraph : paragraph : : Rated accuracy : 3.6.2 : 4.6.3 : : Damping factor : 3.6.2 : 4.6.4 : : Response time : 3.6.
45、2 : 4.6.5 : : Power consumption : 3.6.2 : 4.6.6 : : Frequency .luence : 3.6.2 : 4.6.7 : : Voltage influence : 3.6.2 : 4.6.11 : : Dfelectric stress : 3.6.2 : 4.6.12 : : Insulation resistance : 3.6.2 : 4.6.13 : Test 1 . . 4.6.3 Grou C tests group C tests spec e table E Any defective units shall be cau
46、se for rejection. 4.6.3.1 if a sample falls group C tests, the manufacturer shall take corrective action on the processes and all units of product which were manufactured with the same conditions, materials, processes, and are considered subject to ?he same test failure. Government inspection may be
47、 discontinued, at the option of the Government inspector, untfl a sample produced by the corrected process has been subjected to and has passed the group C tests failed by the preceding sample, Units of product subsequently submitted for Government inspection shall incorporate the corrective action,
48、 unless this requirement is waived temporarily by the bureau or agency concerned. Samples selected in accordance with 4.4.4 shall be subjected to the . Table - Group C tests. : Requfrement Test : Test : paragraph : paragraph : : External field influence ; 3.6.2 : 4.6.8 : : External temperature : : i
49、nfluence : 3.6.2 : 4.6.9 : :. Overload : 3.6.2 : 4.6.10 : 4.6 Test procedures. - 4.6.1 Visual and mechanical inspection. - Meters shall be inspected to determine compliance with all requirements of this specification which do not involve tests. 12 I . I I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-H MIL-M-17263 66 m 9777706 0327723 7 m MIL-M-l9261(SHZPS) 4.6.2 Position influence, - The pointe
