1、- I I MIL-R-81355B bb W 77777Ob 0343065 2 W f 1 z -.e- L i I- i MIL-R- 8 13 5 5 B( AS) ._ .- _- . -I 1 October, 1968 Superseding 1 February 1967 MIL-R-81355A (AS) MILITARY SPECIFICATION RECORDER, BATHYTHERMOGRAPH DATA This specification has been approved by the Naval Air Systems Command, Department
2、of the Navy 1. SCOPE - 1.1 Scope - The equipment covered by this specification shall provide a permanent record of the temperature profile of sea water from sea level to a depth of 1,000 feet. The equipment shall be used in naval aircraft for the purposes of oceanographic research and anti-submarine
3、 warfare. 1 :2 consist of the item listed in paragraph 6.8. Classification - The equipment covered by this specification shall 1.3 associated equipment listed in paragraph 6.9. Associated Equipment - This equipment shall operate with the 2. APPLICABLE DOCUMENTS- General - The following documents of
4、the issue in effect on the - 2.1 date of invitation for bids form a part of this specification to the extent spe- cified herein: 01 FSC 6655 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-L355B 66 7777906 0/1i3066 1i = ._ MIL -R -813 55 B(AS)
5、SPECIFICATIONS Militar y MIL- W- 5088 MIL- E - 5 400 MIL-“-5422 MIL-I- 6181 MIL-C- 6781 MIL-E-17555 MIL - T -1 8 3 03 MIL-N-18307 MIL - F - 251 73 Naval Air Systems Command AR-5 AR-1 0 STANDARDS Military MIL STD 704 MIL STD 781 Federal FED-STD-595 Wiring; Aircraft, Installation of Electronic Equipme
6、nt, Aircraft , Gene r al Specification for Testing, Environmental, Aircraft Electronic Equipment Interference Control Requirements, Aircraft Equipment Control Panel; Aircraft Equipment, Rack or Console Mounted , Electronic and Electrical Equipment and Associated Repair Parts, Pre- paration for Deliv
7、ery of Test Procedures; Preproduction and Acceptance for Aircraft Electronic Equipment, Format for Nomenclature and Nameplates for Aeronautical Electronic and Assoc- iated Equipment Fastener, Control Panel, Aircraft Equipment Microelectronic Devices used in Avionics Equipment, Procedures for Selecti
8、on and Approval of Maintainability of Avionic Equipment and Systems, General Requirements for S Reliability Tests, Exponential Dis tribution Electric Power, Aircraft, Characteristi and Utilization of Colors Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
9、-,-,- - I MIL-R-813 55B(AS) PUBLICATIONS Naval Air Systems Command EI-504 Avionics Installation Instructions for Recorder, Bathythermograph Data RO-308/SSQ- 36 2.1.1 Availability o Documents - When requesting specifications, stan- dards, drawings, and publications, refer to both title and number. Co
10、pies of this specification and applicable specifications require by contractors in connection with specific procurement functions, may be obtained upon ap- plication to the Commanding Officer, Naval Supply Depot, Code 105, 5801 Tabor Avenue, Philadelphia, Pennsylvania, 19120. 3. REQUIREMENTS 3.1 duc
11、 ti on testing . Preproduction - This specification makes provision for prepro - 3.2 fillment of major design objectives shall be the prime consideration. In so doing, the following shall govern: Parts and Materials - .In the selection of parts and materials, ful- (4 Microelectronic technology shall
12、 be considered and microelectronic items shall conform to requirements specified herein. Other parts and materials requirements shall conform to Specification MIL-E- 5400. (b) (cl Nonr epai rable subassemblies, as outlined in Specifi ea tion MIL-E-5400, shall be used when practicable. The gen- eral
13、size of the subassembly and the amount of circuitry to be included therein, shall be approved by the procur- ing activity. Nonrepairable subassemblies must be re- liable. ( See 6.5 ) When previously produced models of this equipment did not use nonrepairable subassemblies, the design shall not be ch
14、anged to employ nonrepairable assemblies with- out the approval of the procuring activity. (4 3.2.1 Nonstandard Parts and Materials Approval - Approval for the use of nonstandard parts and materials ( including electron tubes, transis- tors and diodes ) shall be obtained as outlined in Specification
15、 MIL-E-5400. 0O.F 8.0“ F 16“ F 32“ F 64“ F - - -7- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i MIL -R- 81 3 5 5B (AS) * 3.4.3 Frequency Characteristics - The equipment shall be capable of providing a permanent record of the temperature versus d
16、epth profile of sea water and a concurrent binary coded data word, for the temperature range of 28“ to 95“ F from sinusoidal input signals. The input signal frequency range shall be 1360 Hz to 2700 Hz. The formula to convert input signal.frequency (f) in Hz to temperature readout (T) in degrees Fahr
17、enheit is as follows: f-800 20 T= Conversely, the formula to convert temperature readout to applied frequency is f = 20T + 800. 3.4,4 Sensitivity - The equipment shall operate satisfactorily with in- put signals within the range of O. 5 volt RMS to 3. O volt RMS. 3.5 Detail Requirements - 3.5.1 foll
18、owing requirements. Recorder, Bathythermograph Data - The recorder shall meet the 3.5.1.1 Form Factor - The recorder shall be enclosed in a case, meeting the applicable requirements of Specification NlIL-C-6781, The case shall be suitable for rack mounting in an aircraft in accordance with Specifica
19、tion MIL- F-25173. Case dimensions shall be as stated in Handbook EI-504. * 3.5.1.2 Contents - The equipment shall contain the following subassem- blies and circuits: (a) Input Amplifier (b) Receiver Noise (c) Enable - Inhibit Circuit (d) Calibrate Signal Generator, and Meter Check (e) Frequency to
20、DC Converter (f) Analog to Digital Converter ( A/D Converter ) -8 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-1355B 66 9779906 0143073 I (g) Automatic Start (h) Strip Chart Recorder 3. 5. 1 3 input impedance of 20 K ohms or greater and sh
21、all amplify the applied signal. Input Amplifier - The input amplifier shall provide an equipment 3.5.1.4 noise shall not cause the stylus to deflect in excess of 25% of full scale from its minimum temperature indication. For this requirement, it may be assumed that the receiver noise will be white n
22、oise contained in the spectrum of 100 Hz to 40 kHz, having gaussian distribution of amplitudes with an RMS value of 1.5 volts. Receiver Noise - In the absence of a signal input, the receiver * 3.5.1.5 Enable - Inhibit Cire-uit - The presence of a valid signal shall be recognized by the enable-inhibi
23、t circuit. Under no-signal conditions, this cir- cuit shall provide an inhibit which blocks the Data Word Enter Line. The pre- sence of a valid signal will remove the inhibit. ( See 3.5.1.8 ). * 3.5.1.6 Calibrate Signal Gen,erator and Meter Check - 3.5.1.6.1 tation to: Functional Requirement - The e
24、quipment shall contain instrumen- (a) . Verify calibration (b) Check recorder stylus movement (c) Facilitate fault localization 3.5.1.6.2 Verify Calibration - A 2560 Hz * O. 1% signal shall be derived from a precision tuning fork oscillator. Thii-, signal, when internally applied to the equipment in
25、put ( See 3.5.1.11 ) shall cz.use the recording mechanism and the binary coded data word output to indicate a temperature of 88“ F i 1“ F ( i O. 5“ F for the binary coded data word. ) -9- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- “TB I MIL-R-l
26、355B bb 9779906 Olq3074 3 m I NOTE The 2560 Hz calibrate signal is also utilized as a clock frequency by the A/D converter (see 3. 5.1.8). 3.5.1.6.3 Check Recorder Stylus Movement - The equipmert shall contain facilities to verify free movement of the recorder stylus (see 3. 5.1.11 ). An internally
27、set voltage, when applied to the Strip Chart Recorder cir- cuit shall cause the stylus to indicate a temperature between 25O and 30F. I 3. 5.1.6.4 Facilitate Fault Localization - Front panel controls and the facil - ities described in 3.5.1.6.2 and 3.5. 1.6 3 shall provide the equipment Oper - ator
28、with a convenient means of determining that all features are operational. In the event of a malfunction these facilites shall provide sufficient data to indicate the required organizational maintenance. 3.5.1.7 Frequency to DC Converter - 3.5.1.7.1 Function - The Frequency to DC converter shall acce
29、pt an audio frequency signal indicative of water temperature, and shall convert this data into an analog output voltage for purposes of producing a chart record of sea water temperature versus depth information. 3.5.1.7.2 Output Load - The Frequency to DC converter shall be capable of operating with
30、 satisfactory performance into a resistive recorder load of 100ohms. . 3. 5.1.7.3 Initiation of Signal - The Frequency to DC converter shall provide an output sipalsimultaneously with the receipt of an input signal. * 3. 5. 1.8 Analog to Digital Converter - 3. 5. 1.8.1 Functional Requirement - The e
31、quipment shall incorporate an 8 bit encoder to convert variable frequency ( a function of measured temperature ) into a pure binary output for use by the aircraft Data Processing System. The digital output shall be related to temperature as delineated in 3. 4.3. 3.5.1.8.2 Data Word - The Data Word w
32、ill be presented on eight twisted pairs of lines and shall consist of the following: 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-81355B bb W 77779Ob OLY3075 5 MIL -R -8135 5B(AS) BIT WEIGHT - 1 O. 5“ F 2 1. O“ F 3 2.0“ F . 4 4. O“ F 5 8.
33、0“ F 6 16“ F 7 32“ F 8 64“ F 3.5.1.8.3 Logical States - A logical Zero is equa-4 volts f 1 volt. A logical One (1) is equal to O volts + O. 5 - O. . 3.5.1.8.4 The Data Word will be gated to the out- put lines in a parallel mode at the end of each scaling operation, 100 millisec- onds before raising
34、the Enter Line to the logical One (1) state. The Data Word will be taken to the logical Zero state atthe same time the Enter Line is taken to the logical Zero state. Mode of Presentation - 3.5.1.8.5 Enter Line - When the Data Word is ready for readout by the aircraft Data Processing System, the Ente
35、r Line will be set to the logical One (1) state for a period of not less than 100 milliseconds. The application of the Enter. Line signal will be delayed for a sufficient period of time to assure sta- bilization of the binary word voltages. The Enter Line signal will be applied to a separate twisted
36、 pair line. 3.5,1: 8.6 Word shall be O. 8 seconds. Binary Word Repetition Rate i The Repetition Rate for The Binary 3.5.1.8. ? The output of the Analog to Digital Con- verter shall be capable of driving a DC load of 2,000 ohms and an AC load con- sisting of 130 ohms resistive in series with a . O1 m
37、fd capacitor through 100 feet of twisted pair shielded line. ( The capacitance of the twisted pair is 3,000 pf. ). Output Load Impedance - 3. 5.1.8.8 Rise and Fall Times - The rise and fall times of the Enter Line signal ( measured at the output terminals ) shall not exceed one microsecond. The rise
38、 and fall times of the data word bits ( measured at the output terminals ) shall not exceed 25 microseconds. 3.5.1.8.9 Acknowledge Signal - No Acknowledge signal from the aircraft Data Processing System will be utilized. However, terminals shall be pro- vided for this input as a f growth factor “. I
39、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-R-L355B bb m 777770b 0143076 7 m 3.5.1.8.10 Binary Word Definition - A, true statement shall be ,indicated by a logical One and a false statement by a logical Zero. Example: (Least significant bit
40、 left) (OF) (O. 5) (1) (2) (4) (8) (16) (32) (64) BIT 12 3 4 5 6 7 8 O 1 State ment 1 1 O O10 . Example Temperature equals 73.5“F * 3.5.1.9 Automatic Start - 3. 5.1.9.1 Performance Details, Strip Chart Recorder - The equipment shall incorporate circuitry to automatically energize the strip chart rec
41、order drive system upon the initial receipt of a valid signal from the ARR-72 Radio. The strip chart recorder drive system shall not be energized during the receipt of broad band receiver noise preceding the initial valid signal. When the strip chart recorder drive system is once energized by the ap
42、plication of a valid signal, it shall remain so until the equipment is manually switched off. 3.5.1.9.2 Performance Details, Analog to Digital Converter - In the presence of broad band receiver noise,. and with no valid signal at the equipment input, _ the Enter Line of the Analog-to Digital convert
43、er shall be set to the logical Zero state. Upon the receipt of a valid signal, the Enter Line shall assume its preprogrammed status of being raised to the logical One state at a repetition rate of O. 8 seconds for a period of not less than O. 1 seconds. - 3.5.1.10 analog output voltage of the freque
44、ncy to DC converter which is proportional to the sea water temperature in tlie range of 28F to 95F. Strip Chart Recorder - The strip chart recorder shall record the 3.5.1.10.1 of 90 f 2% inches per hour when energized, using a 400 Hz nominal supply. Chart Advance Rate - The Strip chart shall advance
45、 at a rate 3.5. 1.10.2 Drive Motor - The strip chart drive motor na1 power of 115 V AC, 400 Hz power. shall operate on a nomi- 3. 5.1.10.3 Writing Rate - The stylus shall provide impressions (dots) at the minimum rate of 5 dots every four seconds. - . /- 12 Provided by IHSNot for ResaleNo reproducti
46、on or networking permitted without license from IHS-,-,-MIL-R-833558 bb m 77777Ub 0343077 7 m - - MIL -R - 813 5 5B( AS) 3.5.1.10.4 inches wide andaal1 be 65 + 5 - O feet long. The viewing portion shall feed upward ( toward the top of the recorder ). Chart Paper - The Chart paper shall be a minimum
47、of 2-1/2 3.5.1.10.4.1 Graduations - The printed portions of the chart paper shall be graduated across into 15 divisions, each division representing 1“ F. Every fifth division shall be accented. The printed portion of the chart shall be grad- uated lengthwise along the paper by a division every O. 25
48、 inches. 3.5.1.10.4.2 mum height, for .the indication of temperature. The temperature range shall be 25“ F to 100 O F. from left to right with markings every 15 “ F ( every third accented division ). The temperature indication shall be displayed at.intervals to permit constant correlation through th
49、e viewing window. The chart paper shall have num- bers, 3/32 inch minimum height, along the left hand edge. The numbering shall be cyclic, from one to ten ( reading from top to bottom ) spaced l/Z inch apart ( Every other O. 25 inch divisimi ). 3.5.1.10. 5 release of the chart paper drive to enable the chart paper to be manually ad- vanced. * 3.5.1.10. 5.1 Numbering - The chart paper sha
