1、MIL-V-5622A 66 m 7977706 012512 7 Ir MIL-V-5 62 2A 24 JULY 1963 SUPERSEDING 30 JANUARY 1950 MIGV-5622 MILITARY SPECIFICATION VOLT-AMMETER DUAL POUTTER DIRECT CURRENT This specification has been approved by the Department of Defense and is mandatorg for use by the Departments of the Armil, the Navy,
2、atid the Air Force. 1. SCOPE 1.1 Scope. This specification covers design requirements and all perf ormance require- ments for procurement of a dual pointer direct current volt-ammeter. 1.2 Classification. meters shall be fiir- nished in ranges as specified on MS18098. 2. APPLICABLE DOCUMENTS 2.1 The
3、 following specifications, standards, and publications of the issue in effect on date of invitation for bids form a part of this specification, to the extent specified herein. SPECIFICATIONS FEDERAL QQ-CSZO QQ-N-290 QQ-P-416 MIIirrAaY MIL.S-61 - Chromium Plating .( E 1 e c t r o d e - posited) - Nic
4、kel Plating (Elec- trodeposited) -Plating, Cadmium (Electrode- posited) - Shunts, Instrument, External 50 Milli- MIGP-116 MIL-N-3336 MIGD-70327 MIL-1-45272 MIL-C-5541 MIL-S-6872 MILS-7742 MIGP-7936 volt (Lightweight SPe) -P r eserva t i on, Methods of - Nut, Self Locking, In- strument Mounting - Dra
5、wings, Engineer- ing and Associated Lists - Environmental Test- ting, Aeronautical and Associated Equipment, General Specification for -Chemical Films for Aluminum and Alu- minum Alloys - Soldering Process, General Specifica- tion for -Screw Threads, Standard, Optimum Selected Series, General Specif
6、ica- tion for - Parts and Equipment, Aeronautical, Pre- paration for Del- iverg Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-5622A 66 779790b 0325327 O MIGV-5622A MIGA4625 - Anodic Coatings, for Aluminum and Alu- minum Alloys MIIL-25142 - Lu
7、minescent Mate- rial, Fluorescent STANDARDS FEDERAL FED. STD. No. 595 -Colors MILITARY MILSTD-105 - Sampling Procedures and Tables for In- spection by Attri- butes MIL-STD-130 -I d en t i f i cat i o n Marking of U. S. Military Property MS33558 -Numerals and Let- ters, Aircraft In- strument Dial, St
8、andard ,Form d MS33686 - Metals, Definition of Dissimilar MS18098 - Volt-Ammeter, Dual Pointer, Direct Cur- rent (Copies of the applicable documents required by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contract
9、ing officer.) 3. REQUIREMENTS 3.1 Preproduction. The meters furnished under this specification shall be a product, samples of which have been tested and passed the preproduction tests specified herein, . 3.2 Stmdard parts. With the exception of 3.2.1, MS and AN standard parts shall be used where the
10、y suit the purpose. They shall be identified on the drawings by their part numbers. 3.2.1 Commer the volt- meter shall be af the suppressed zero con- struction with scale range of 15 to 33 volts. The indicator shall #be as shown on MtS18098. Table I gives additional applicable informa- tion. 3.5 Cas
11、e. The outline dimensions of the meters shall conform to MS18098. 3.5.1 Body. The body of the case shall ibe made of lightweight metal or suitable ther- mosetting plastic moulding material uniform in texture, and shall have a smooth surface. The case shall be finished in a durable luster- less black
12、 fmish, Color 37038 of FED. STD. No. 695. 3.5.2 Cover glass. The cover glass shall be clear and free from flaws which interfere with normal reading of the meter. 3.6 Dial. The dial shall be made of stiff material firmly secured to its mounting and shall be marked as specified. Paper dials Will -be s
13、atisfactory only when adequately bonded MIGV-5622A to and backed by a metal support. The dial shall be of such material and so secured as to meet all the tests specified herein without fading, discoloring, warping or other dete- rioration. 3.6.1 Distance -Dial to cower glass. The distance from the d
14、ial to the cover glass shall be as small as practicable and shall not ex- ceed s/sz inch. 3.6.2 VGGbiEty of dial. The pointer, num- erals, and all other specified markings on the dial shall be visi.ble from any point within the frustum of a cone whose sides make an angle of 30 with a perpendicular t
15、o the dial and whose small diameter is the aperture of the case. 3.7 Pointers. The meter pointers shall be of rigid construction suitable for the intended applications and shall not become damaged or distorted when subjected to any of the tests specified herein. The pointers shall be as shown in MS1
16、8098. 3.7.1 Ammeter nndex and voltmeter mask- ng index. The ammeter shall be provided with an adjustable striped index and the voltmeter shall be provided with an adjust- able masking index as shown on MS18098 with adjustment accessible from the front of the case. Background of each index shall be d
17、urable dull black. 3.8 Pointer clearance (parallax). The clear- ance between the pointer and the graduated scale shall not exceed 0.05 inch. 3.9 Shunts. External shunts, when fur- nished with meters, shall be in accordance with Specification MIL-S-61. External shunts shall not be furnished wibh mete
18、rs unless specified by the procuring activity. 3.9.1 The ammeter shall be adjusted to give fuII scaIe reading at 50 millivolts with a shunt lead resistance of 0.6 -i-0.06 ohms in series with the meter. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
19、,-MIL-V-5622A 66 997770b 0125131 7 MZLrV-5622A 3.10 Bearings and pivots. Moving elements shall turn on hardened, accurately ground, and highly polished steel pivots bearing on highly polished first-quaIity sapphire, dia- mond jewels, or other materials that have been approved as alternates to precio
20、us gems. 3.11 Adjustment. Meters shall be adjusted to provide full scale readings as specified. 3.11.1 Accurmg adiustment. Meters shall be provided with some practicable shop means of adjustment to accuracy. Charging to the magnet and magnetically treating it to obtain accuracy shall be considered a
21、s meeting this requirement. Internal resist- ances shall be easily accessible. 3.12 Calibratim ad jastment. The voltmeter shall be provided with a calibration adjust- ment accessible from the front of the case. It shall provide for a minimum range of ad- justment of 1.25 volts above and ,below 28 vo
22、lts with 28 volts impressed on the meter. The calibration adjustment shall be suitably insulated to eliminate .all danger to the operator. The adjustment mechanism (or screw) shall be designed and constructed to prevent damage when meter is placed face down and also shall have sufficient friction to
23、 prevent it from shaking loose and changing its adjustment due to the vibration test spec- ified herein. (See par 4.7.2.) 3.13 Accuracy at room temperature. Unless otherwise specified, the ammeter shall indi- cate correctly within -c2 percent of full scale deflection for each major graduation. “he v
24、oltmeter, when adjusted by means of the calibration adjustment to read accurately at 28 volts, shall indicate correctly at the other major scale points within k0.7V. These tests shall be conducted at room temperature of 25 *SOC. (77 k9OF.). (See par 4.7.3.) 3.14 Damping factor. ve meters shall have
25、an efficient damping arrangement to prevent excessive oscillation o the pointers at fluctuating loads. The damping factor 4 shall not be less than 2.6 for the ammeter and 2.0 for the Voltmeter, .(see 6.2.2) when tested as specified in 4.7.4. 3.15 Response time. Response time when tested as specified
26、 in 4.7.5 shall not exceed 2.5 seconds when a voltage or current suffi- cient to give full-scale momentary deflection is suddenly applied. (See 6.26.) 3.16 Balancing. When meters are tested as specified in 4.7.6 the pointer tip shall not deviate from the zero mark by more than 2 percent of the full
27、scale length for ammeters. The voltmeter pointer shall remain at the 28V mark within 7-0.7 volt. 3.17 Vibration Error. Neither pointer oscil- lation nor pointer displacement shall exceed 3 percent of full scale deflection for the am- meter, -l volt for the voltmeter, when the meter is subjected to t
28、he test of par 4.7.7. At the conclusion of the test the meter shall pass an accuracy at room temperature test. 3.18 Insulation resistance. The insulation resjstance between each terminal and the metal panel upon which the instrument is mounted shall be not less than 20 megohms at a potential of 500
29、volts dc, when tested in accordance with 4.7.8. The same tolerance shall apply when 300 volts de is applied be- tween one terminal of the voltmeter and one terminal of the ammeter. 3.19 Insulation test. A voltage of 1000 volts rms alternating current, commercial frequency, applied for a period of on
30、e min- ute shall cause no breakdown of insulation when tested in accordance with 4.7.9. 324 Magnetic effect. The meters shall be magnetically shielded so that they will not cause a deflection of the compass of more than 6 degrees when tested as specified in 4.7.10. 3.21 Temperature influence. The te
31、mpera- ture influence of the meters when tested as specified in 4.7.11 shall not exceed 1.0 per- . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-/ MIL-V-5622A bb M 7777906 0325332 O M MIL-V-5622A cent for the ammeter and 0.2 volt for the voltmete
32、r (see 6.2.8). 3.22 Heat effect. When tested as specified in 4.7.12 meters shall indicate freely at 70 C. (168O F.). The change in indication at the end of each heat cycle shall not exceed 1.75 volt for he voltmeter or E.5 percent for the ammeter. The maximum permanent change in indication between t
33、he beginning of the first heat cycle (initial accuracy indication) and the end of the third cycle shall not ex- ceed 2 percent for the ammeter or 0.5 volt for the voltmeter. 3.23 Low temperature. The change in indi- cation when the meter is subjected to the low temperature exposure test of 4.7.13, s
34、hall not exceed 8 percent for the ammeter and 1.35 volt for the voltmeter. 3.24 Vibration failure. The meter shall satisfactorily pass an accuracy at room tem- perature test after being subjected to the vibration test specified in 4.7.14. The zero of the ammeter shall not have changed. The friction
35、error shall not exceed 11/2 times the allowable room temperature scale errors. 3.25 Shock. Permanent errors in the meter indication resulting from shock of the char- acter and intensity specified in 4.7.15 shall not exceed 2 percent of full-scale deflection for the ammeter and 0.7 volt for the volt-
36、 meter. No screws, bearings, pivots, or other parta shall become loosened or unduly dam- aged so as to affect the operation of the meter. 3.26 Momentary overload. Meters shall be sufficiently rugged to withstand a series of momentary overloads as described in 4.7.16 without incurring damage other th
37、an a per- manent error, at any part of the scale, of not more than one percent of the full scale length for the ammeter and 0.33 volt for the voltmeter. 3.27 Sustained overload. Meters shall with- stand for 8 hours sustained loads as speci- fied in 4.7.17 without a permanent change in indication of
38、more than 1 percent of the full- scale length for the ammeter or 0.33 volt for the voltmeter. The ammeter permanent zero shift shall not be greater than 1.0 percent of the full-scale length. No other permanent damage shall have occurred, The temporary zero shift shall not exceed 2 percent of the ful
39、l-scale length for the ammeter. 3.28 Humidity. The meters shall operate satisfactorily after subjection to the humid- ity test specified in 4.7.18. The permanent change in indication after the final humidity cycle shall not exceed 3 percent of full scale. 3.29 Mounting lugs. Instrument mounting lugs
40、 when tested in accordance with 4.7.19 shall prithstand an axial load of 175 lbs. without fracture, 3.30 Bearing adjustment screw. To prevent tampering, the bearing adjustment screw shall not be exposed outside of the instru- ment case. 3.31 Terminal posts. Threaded terminal posts shall be provided
41、with the proper nuts and lock washers for attaching cable termi- nals as specified in MS 18098. 3.32 Screw threads. Screw threads 0.060 inch or larger in diameter shall be in accord- ance with Specification MILS-7742. 3.33 Interchangeability. All parts having the same manufacturer”s part number shal
42、l be directly and completely interchangeable with each other with respect to installation and perf ormance. Ghanges in manufacturers part number shall be governed by the draw- ing number requirements of Specification MIL-D-5028. 3.34 Physical requirements. 3.34.1 Weight. T,he weight of the meter sha
43、ll be as specified in MS 18098. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-5622A 66 7777706 0325333 2 MIGV-5622A 3.34.2 Finhh. Protective coatings and finishes which will crack, chip, or scale dur- ing normal service life or due to extreme
44、s of atmospheric conditions shall not be used. 3.34.2.1 Aluminum alby parts. Where practicable, aluminum alloy park shall be covered with an anodic film conforming to Specification MIL-A-86t25. Aluminum alloys which do not anodize satisfactorily shall be coated with a chemical film in accordance wit
45、h Specification MIL-(3-5541. 3.34.2.2 Iron and steel parts. Where prac- ticable, iron and steel parts shall be cad- mium, chromium or nickel plated in accord- ance with Specifications QQ-P-416, QQ-C- 320, and QQ-N-290, respectively. 3.34.3 Soldering. Soldering shall be per- formed in accordance wth
46、Specification MIL-S-6872. 3.35 Marking. All markings shall be dur- able to withstand usage encountered in service. The form of the letters and num- erals shall conform to Standard MS33558. Numerals shall distinctly indicate the gradu- ation to which each applies. 3.35.1 Diu2 and Pointers. The meter
47、dial and pointers shall be marked as shown in MS18098. 3.35.2 TeminuEs. Studs shall not be elec- trically connected to the meter case. The polarity of the meter studs shall be legibly and permanently marked as specified in MS18098. 3.35.3 Case. The back of the meter shall be legibly and permanently
48、marked as shown on MS18098. 3.36 Installation instructiw. The contrac- tor shall furnish with each meter one printed copy of instructions with illustrations and diagrams covering the installation of the meter. Prior to printing, the copies shali be .” r 6s. furnished to the procuring activity for ap
49、- proval. The instructions shall be printed on 8v2 by 11 or 11 by 15 inch paper. 3.36.1 Envelope, An envelope furnished by the contractor, containing installation in- structions and sufficient 6-32 NC+ round- head durable black finish mounting screws and nuts (MIL-N-3336) for installing the meter in panels up to 3/is inch thick, shall be packaged with each meter, and shall be marked with the following information : “IMPORTANT TIONS, MOUNTING SCREWS AND NUTS” THIS ENVELOPE CONTAINS INSTRUC- 3.3
