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Страница 2: ...OPERATING INSTRUCTIONS PULSE SWEEP AND ME DELAY GENERATOR Form 9374 May 1960 G E N E R A L R A D I O C O M P A N Y WEST CONCORD MASSACHUSETTS USA ...

Страница 3: ...s and Resistances pages 32 et seq Note the following Parts List changes 24 23 40 55 145 120 55 55 105 120 195 195 175 90 235 195 155 75 0 26 175 155 All Type COC 63 capacitors a r e changed to Type COC 62 GENERAL RADIO COMPANY West Concord Massachusetts 210k 330k 180k 750 600 6 8k 180k 750 600 6 8k 620k 51 840 5k 620k 51 840 5k 150 25k 890 600 October 1960 Printed in USA 26 26 155 155 V603 OD3 150...

Страница 4: ...its 12 3 4 Delay Circuits 13 3 5 Sweep and Pulse Timing Adiustments 14 3 6 Power Supply Adjustments 15 Section 4 DETAILED CIRCUIT DESCRIPTIONS 16 4 1 General 16 4 2 Input Circuits 16 4 3 Delay Circuits 16 4 4 Coincidence Circuits 17 4 5 Sweep Circuits 18 4 6 Pul se Timing Circuits 19 4 7 Pulse Generating Circuits 19 4 8 Power Supplies 20 Section 5 SERVICE AND MAINTENANCE 21 5 1 General 21 5 2 Serv...

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Страница 6: ...n of coincidence gate from 3 to 1000 DURATION psec 6 COINCIDENCE Continuous rotary control Selects threshold at which coincidence driving signals will SENSITIVITY produce delayed sync signals 7 SWEEP TRIGGER 2 pos toggle switch Selects either direct or delayed sync signal to start sweep PULSE AND SWEEP TIMING 8 SWEEP MULTIPLIER 5 pos selector switch Determine sweep duration from 3 to 120 000 p s e...

Страница 7: ... trigger and the accompanying direct synchronizing signal available at the DIRECTSYNC OUT terminals This switch also provides for ac or dc connection of the input signal to the trigger circuits 1 2 5 2 Delay Circuits The delay circuits produce delayed triggers and delayed synchronizing signals whose timeof occur rence relative to the direct trigger is controlled by the DELAY MICROSECONDS and RANGE...

Страница 8: ... added to ex ternally generated pulses to start and stop the pulse Thus the delay circuits and the pulse trigger circuits can be used simul taneously to produce a double pulse L A 8 It can be formed on whichever zero crossing the user selects For sine and square wave inputs the trigger generating system requires about 0 3 volt peak for brief pulses of either polarity about 1 volt The sweep and del...

Страница 9: ...the circuit can no longer be operated by the opening of the coinci dence gate alone and the circuits are prepared for coincidence operation In this condition during the intervals in which the gate is open the injection of a positive or negative pulse a t the appropriate COINCIDENCE DRIVE terminals will cause the co incidence amplifier to operate resulting in the formation of the delayed synchroniz...

Страница 10: ...en Delay Cir cuit Is Used as a PRF Di vider Coincidence Circuit Driven by Direct Synchro nizing Pulse V L I I I Y 3MSEC I T I I 1 I I I I I I D I R E C T F T SYNC DELAY GATE POS GATE NEG GATE FROM SWEEP TRIGGER s w E p SWITCH NEG SWEEP Figure 1 5a Block Diagram of Sweep Circuits L TIMINO CIRCUITS INDICATOR h h h h h h h h h 4 I I I I 9 2 I I I I I I I I I COINC GATE DIRECT OR I I DELAYED TRIGGER I...

Страница 11: ...ulse and to the START and STOP panel terminals When the PULSE START STOP TRIGGERS switch is set to INTERNAL CIR CUITS NORMAL these triggers operate a pair of amplifier stages which shape them to drive the bistable multivibrator circuit of the pulse source 1 2 6 6 Main Pulse Generating Circuits See Figure 1 6a The START and STOP triggers operare a high speed bistable gate circuit This circuit drive...

Страница 12: ... it can be a crystal oscillator with frequency dividers to produce any frequency up to the 100 200 kc region More complex sources of time coherent pulses are needed for the time selection opera tions describedin paragraph 2 5 2 For these operations a timing generator such a s the Tektronix Type 180 Dumont Type 300 or equivalent can be used Choice of oscilloscope will depend on the application An o...

Страница 13: ...OSITIVE SWEEP 60psec NEGATIVE PULSES DELAY 20 FIGURE 2 3 100 kc PRF DELAY SET FOR 70psec SWEEP SET FOR 30wsec C DIRECT SYNC PULSE DURATION 20 FIGURE 2 4 DELAY SET FOR 72psec PRF 100 kc FIGURE 2 5 PULSE PAIR PRF 10 kc DELAY 20psec TRIPLE SWEEP AND PULSE BY DIRECT SYNC TO POS COlNC DRIVE INTERNAL MULTIPLE PULSEMETHOD TOPRODUCEDOUBLE PULSE A DIRECT SYNC B DELAY SYNC C SWEEP D PULSE A DIRECT SYNC B DE...

Страница 14: ...out 180 degrees and should appear a s shown in Figure 2 lb f Connect the oscilloscope input to the Type 1371 B DI RECT SYNC OUT terminals and observe the 75 volt 1 5 psec positive synchronizing pulse It should appear as shown in Fig ure 2 1C or 2 2A 2 5 DELAY CIRCUIT 2 5 1 NORMAL USE a Leave the input circuits connected a s in paragraph 2 4 with the TRIGGER SELECTOR switch set for either positive ...

Страница 15: ...ORMAL clockwise position Correct setting should yield a pattern similar to that shown in Figure 2 7C 1 The TIME DELAY MICROSECONDS and COINCIDENCE GATE DURATION controls can now be varied to study the cir cuit action The basic principles of operation of this circuit are presented in paragraph 1 2 6 3 and Figure 1 4 shows an ideal ized time diagram illustrating the time selection system m Now obtai...

Страница 16: ...and PULSE AMPLITUDE controls Some defects might appear in the pulse due to impedance mismatch a s the OUTPUT IMPEDANCE setting is varied Note also that the PULSE AMPLITUDE control adversely affects the pulse shape when the pulse is set to greatly reduced values The PULSE AM PLITUDE control i s generally satisfactory for pulses of long duration and over a 10 or 20 db range but for best pulse shape ...

Страница 17: ...ed in paragraph 3 4 is common to all delay ranges An equivalent adjustment may be necessary in the sweep circuits to restore the calibration of the pulse delay dial when either V303 or V307 is replaced The con trols requiring readjustment are the pulse duration and delay minimums R412 and R411 Refer to paragraph 3 5 2 Other ad justments are those used to correct for component tolerances in the R C...

Страница 18: ...DS dial is rotated so that the actual delay is 190 psec The second 100 psec marker pulse from the timing generator will lie in the center of the coincidence gate and the DELAY MONITOR lamp will glow As the delay dial setting is increased to exactly 200 psec the leading edge of the coincidence gate will move out from under the 100 psec marker and the lamp will go out It is apparent therefore that t...

Страница 19: ...to set the end of the pulse to the 500 psec mark i Adjust R352 SWP AMP to set the end of the sweep to 600 psec j Adjust R411 POS MIN to set the start of the pulse to the 100 psec mark and then rotate the PULSE DURATION dial to exactly zero without disturbing the PULSE DELAY dial k Adjust R412 DUR MINI to set the end of the pulse to co incide with the start af the pulse at the 100 psec mark Both pu...

Страница 20: ...seful though not absolutely neces sary includes either a wave analyzer General Radio Type 736 A or equivalent or a Distortion and Noise Meter General Radio Type 1932 A or equivalent 3 6 2 INPUT POWER CHECK The Type 1391 B requires 420 watts a t 115volts 60 cycles 3 6 3 300 VOLT REGULATOR ADJUSTMENT a Measure the 300 volt power supply at pin 2 of plug PL401 permit the meter to read upscale Now vary...

Страница 21: ...he trigger for small signal in puts This i s the normal setting c select an exact voltage at which V102 will switch thus permitting the exact sensing of zero crossing for large signals The pentode section of V103 is turned on by the positive trig ger generated by the Schmitt circuit on the selected zero cros sing either positive or negative going A network in the plate of V103A produces the 0 10 p...

Страница 22: ...used a s a frequency divider and or when the delay control is set to produce a delay nearly equal to the input period 4 4 COINCIDENCE CIRCUITS 4 4 1 GENERAL The 3 1000 psec monostable gate is opened by the negative delay reset trigger In normal operation the posi tive early transition of this gate turns on the coincidence ampli fier The pulse of plate current of the coincidence amplifier i s inver...

Страница 23: ...02 beyond cutoff The plate voltage of V302 is very nearly equal to the positive power supply voltage 55 volts Therefore bothV303 the sweep generator andV309 the keyed clamp are in conduction When a negative sweep trigger is received V301 is turned off and the resulting regenerative action causes V302 to switch on rapidly When V302 comes on V303 and V309 are turned off and the sweep is started Swee...

Страница 24: ...m parator would then trigger one third of the way along the sweep at 1 psec and the stop amplitude comparator two thirds of the way along the sweep at 2 psec resulting in a time between trig gers produced by these two circuits of 1 psec the desired pulse duration V401 and V402 are Schmitt circuit amplitude comparators similar in form to the equivalent comparators of the delay and sweep circuits Th...

Страница 25: ...pplies are in the Type 1391 P2 Power Supply Unit This supply provides the four 6 3 volt heater supplies and the nine d c power supplies required One 10 conductor cable carries the four heater palrs and the 115 volt conductors required to operate the blower The four heaters are identified by the letters P for positive A for am plitude comparator G for ground and N for negative The A bus is a shield...

Страница 26: ...iron to remove solder draw the solder back along the conductor from the tab with quick strokes Never apply the soldering iron to the etched board for more than five seconds at a time If the position of the board prohibits the above pro cedure many components can be replaced a s follows des troy the old component preserving enough wire to attach the replacement then solder the new component in plac...

Страница 27: ...rom STOP Trigger Terminal When PULSE START STOP TRIGGER Switch is in INTERNAL NORMAL Position This indicates failure inV402 V404 or V406 First check TP402 for the positive stop trigger a s shown in Figure 5 7 If the trigger exists the difficulty is with V404 or V406 5 2 2 11 No Main Pulse Both Start and Stop Triggers Present When PULSE START STOP TRIGGER Switch is in INTERNAL NORMAL Position This ...

Страница 28: ...minals will reverse Any abnormal voltages indicate difficulties that can be remedied by replace ment of tubes or components 5 4 SETUP PROCEDURE FOR THE PULSE DURATION AND POSITION DIAL ASSEMBLY The following procedure will be necessary only when a potentiometer is replaced or a part of the mechanical assembly is damaged and must be replaced The object is to adjust the potentiometer blades so that ...

Страница 29: ...ation of oscilloscope probe if one is used Calculate coupling time constant it must be at least 10 times as large as pulse transmitted to produce less than 10 rampoff Check typical rise times in Specifications Remember that systemtolerance to stray capacitance decreases as output im pedance increases Check oscilloscope bandwidth remembering that observed rise time is that given by over all system ...

Страница 30: ...mal value r Low output voltage s Burned out or overheated resistors in filter networks 1 Try to find source of overload with ohmmeter check The damagedrectifier is easy to find by visual inspection Refer to rectifier layout in Figure 5 13 2 Replace the defective components or component 3 Then replace the defective rectifier 4 Carefully testrepaired supplyby measuring the output volt age at very lo...

Страница 31: ...tain various sets of conditions in the information in the lower part of that column which indications as listed in the left hand column are either t 300 v output not regulated too high u 300 v output not regulated too low POWER SUPPLY Cont Check V602 and V603 Component may be causing V602 to be nonconducting Check V601 for a grid cathode short Check V601 and the 450 v supply After replacing any tu...

Страница 32: ...c l n G C 4 G r 0 0 0 0 m m m m ggg N N W 4 4 P I 4 b4 a r h 5 0 4 4 PI 4 S G Q P I U G U f N N n m 0 3 2P d m m gJ z z a a u 8 a a a a 9 E rn d 4 a i b m j 7 2 2 b q l n m 1 c 2 N 1 2 g s s c 4 4 4 a b a a c 4 4 I E 0 l 4 u 3g88 8 qta w r r tda3 E 4 4 a 3 51 r 9 M E O O H a c 4 4 e s m m m Z o 3 3 u 2 m P I c E g 8st oorl d a r n 0 0 0 0 o a h N N N U a r n 3 3 3 3 m gH ausNg q m z 54 w3 a w g g ...

Страница 33: ... 7 D C VOLTS 33 100 1 300 3 I80 10 7k 2 20 6 31 19k 7 15 20k 9 300 0 7 2 5 lk 1 0 6 107k 5 14 20k 6 38 12k 2 5 1 2 280k 6 33 470k 7 0 6 3M RES TO GND 5k 2M 1 2 5 6 7 1 2 5 6 7 1 2 5 6 7 1 2 3 6 7 8 1 2 3 6 7 8 1 2 3 6 7 8 1 2 3 6 7 TUBE TYPE V308 108 110 23 55 110 115 110 40 55 110 6 3 0 2 5 14 0 298 2 5 15 300 2 5 15 250 0 5 300 22 0 295 I50 I50 290 14 I50 300 21 38 250 1 PIN 8 1 3 3k 6 8k 47k 3 ...

Страница 34: ... versa TIME DELAY RANGE 10 100 ms COINCIDENCE GATE DURATION CCW COINCIDENCE SENSITIVITY CW MICROSECONDS 1 00 PULSE AMPLITUDE CW OUTPUT IMPEDANCE 150 PULSE DELAY CW PULSE DURATION CW SWEEP MULTIPLIER 10 SWEEP SCALE 6 5 Operate RESET switch before making voltage measure ments 6 All resistances a r e in ohms unless otherwise indicated by k kilohms o r M megohms 7 Resistance measurements were made wit...

Страница 35: ...ignal 3 Switch settings OUTPUT IMPEDANCE 150 PULSE AMPLITUDE CW 4 Any abnormal voltages indicate troubles that canbe rem edied by replacement of tubes or components TABLE 5 5 POWER SUPPLY CIRCUIT CONNECTIONS TABLE 5 6 TABLE OF D C OUTPUTS Measured at S0602 TUBES V308B VlOlA V102 V104B V203 V204A V205 V207A V208 V303 V304 V309 V306 V307B VlOlB V103 V104A V204B V206A V207B V308A V307A7V305 V310B V20...

Страница 36: ... REC 3OBF REC 20BF REPO 43 REC 20BF REC 30BF REC 2OBF REC 20BF COC 21 M50 COT 23 COM 2OB COC 63 COM 20B COM 20B COM 20B COL 71 COC 63 COW 25 COL 71 COC 1 explanation of NOTES refer to page 42 POS GOING Dc NEG GOING A C S O ENGRAVING RESISTANCE IN OHMS UNLESS 07HERWISE SPECIFIED K I000 OHMS M I MEGOHM I SCREW DRIVER ADJUSTMEN7 RESISTORS 2 WATT UNLESS OTHERWISE SPECIFIED DIRECT TRIGGER I TO DELAY CI...

Страница 37: ...BF COC 21 COC 21 COC 21 N750 COC 21 N750 COC 21 N750 COM 2OB COL 71 COC 63 COC 63 COW 16 COC 63 COW 17 COT 12 COM 20E COM 35E ZCOP 8 ZCOP 6 2 COC 63 COC 2 l N750 COM 20B 220 2 5 1 2w 100 k 5 1 2 w 330 5 1 2 w 6 8 k lwo 2 w 1 k 5 1 2 w 100 k lvo l w 10 k 5 100 5 1 2 w 1 k 5 1w 47 5 1 2 w 47 k 5 1 2w 180 k 5 1 2 w 5 1 k 5 1 2 w 1 k 5 1 2 w 27 k f 5 I w 27 k 5 1w 33 k 5 1 2 w 10 k k 5 5 w 220 k 5 1 2...

Страница 38: ...CH T201 TRANSFORMER C245 C246 C247 C248 3249 C250 C251 C252 C253 C254 C255 0 22pf 5 1 v 0 1i Odc v 0 0047pf lwo 600dcwv 0 22pf flwo 200dcwv 330 lwo 500dcwv 0 001pf f 2 3OOdcwv 0 lp f flwo 4OOdcwv 0 001P f lvo 5 0 0 d v 47 tlwo 5OOdcwv 0 047pf 51 100dcmv 470 lwo 500dcwv 10 50 Sppf 500dcwv 0 01pf lwo 60Odcwv 0 01pf 100 0qr 500dcwv 1N54 A 1N54 A IN118 1N34 A IN118 CHA 3 2 CHA 3 3 SWRW 113 SWT 8 SWT 3...

Страница 39: ...TER CABLE CONNECTIONS CAPACITANCE VALUES ONE AND OVER N MICRO MICRO SHOWN IN FIGURE 5 5b FARADS LESS THAN ONE N M CROFA ADS UNLESS OTHERW SESPECIFIED Figure 5 2 Schematic Diagram for Delay Circuits T O V 3OI f A T 3055 SWEEP CONTROL GATE 300 REG P N2 Pi 401 300 PIN 4 PL 401 RANGE I lurn lSEC ...

Страница 40: ...f 3 12 430 0 0047pf 0 047pf 0 47pf 0 1 pf 1 clf 1 pf 47 30 clf 0 OOlclf 220 47 10 47 0 1 pf 1 clf 1 f 1 wf 16 Pf 100 lvo 500dcwv lvo 5 0 0 d c lvo 500dcwv lvo 500dcwv 10 dcwv 21 300dcwv lWo 600dcwv 1 2 w REC 20BF 2 w REC 41BF CRYSTAL DIODE P a w 3 CRYSTAL DIODE 1w REC 3OBF CRYSTAL DIODE SWITCH I I I 1 I or explanation of NOTES refer to page 42 GR No NOTE A REC 20BF REC 20BF REC 20BF REC 41BF REC 2...

Страница 41: ... C F SWEEP PAML YON1TOR I 0 w INDICAtUR TO PULSE TlMIM OlRCUl S I 1 SCREW DRIVER ADJUSTMENT 0 PANEL ADJUSTMENT SWEEP SWEEP SWEEP CONTROL GATE INVERTER BISTABLE 6ATE C F RESISTORS If2 WATT UNLESS OTHER WISE SPECINED RESISTANCE IN O M S UNLESS OTHER WISE SPEC F ED K 1000 OHMS M I MEGOHM CAPACITANCE VALUES ONE AND OVER IN MICROM CROFARADS LESS THAN ONE N MICROFARADS UNLESS OTHERW SE SPECIFIED HEATER ...

Страница 42: ...2OBF 3 3M 5 1 2w REC 20BF 33k 5 I W REC SOBF 12k 51 1 2w REF 70 30k 51 1 2w REF 70 18k 25 1 2w REC 20BF 6 8k 5 I W REC 30BF 47k 5 I W REC 30BF 330k 25 1 2w REC 20BF 27k 55 1 2w REC 20BF 1 2k 55 1 2w REC 2OBF 18k 55 1 2w REC 2OBF IM 5 1 2w REC 2OBF 1M 5 1 2w REC 20BF 10k 5 2 w REC 41BF 36k 5 1 2w REC 2OBF PART NO NOTE A 150k 5 1 2w REC 20BF 33 5 1 2w REC 2OBF 10k 5 2 REC 41BF 33 lo 500dcwv COC 21 N...

Страница 43: ... WATTUNLESS OTHERWISE SPECIFIED RESISTANCEIN OHMS UNLESS OTHERWISE SPECIFIED 0 PANEL CONTROL K 1000 OHMS M I M E W CAPACITANCE YALLIFS ONE AND OVER IN MICRO MICROFARADS SCREW lRlvER ADJUSTMENT LESS THAN ONE IN MICROFARADS UMESS OTHERWISSE SPECIF E HEATER CABLE CONNECTIONS SHOWN IN FIGURE 5 5b Figure 5 4 Schematic Diagram for Pulse Timing Circuits ...

Страница 44: ...0BF 56 25 2 w REC 41BF 56 5 2 w REC 41BF 470 5 10 w REPO 42 470 10 w REPO 42 680 1 2w REC 20BF 750 5 1 2 REC 20BF l k 5 1 2 REC 2OBF 1 5k 5 1 2w REC 2OBF 0 8 2 4 3 R562 R563 R564 R565 R566 R567 R568 R569 R570 R571 R572 R573 R574 R575 R576 R577 R578 R579 R580 R581 R582 C501 C502 C503 C504 C505 C507 C508 C509 C510 C511 D501 D502 D503 L50l L502 L503 L504 L505 L506 L507 L508 L509 L510 LSll L512 L513 L...

Страница 45: ...Block Diagram for Pulse rp 502 0 POWER c AMPL VIER DRIVER AMPLIFIER Inerator Circuits c c AMPLIf IEff V 4 0 5 START TRIG G E V406 STOP TRIG GEN PULSE CONTROL B STA8LE ...

Страница 46: ...Figure 5 5b Detail of Plugs for Power Supply J 3 4 5 6 7 8 GY RD C EL RD 4 EL WH RO b YE 6Y ...

Страница 47: ... REC 2OBF REC 2OBF REC 2OBF REC 2OBF REC 2OBF REC 2OBF REC 20BF REW 3C REC 41BF REPO 22 REPO 2lP REPO 22 REPO 22 COE 45 COE 45 COE 52 COE 52 COE 52 COE 52 COE 52 COE 52 COE 52 COE 52 C611A C611B C611C C612A C612B C612C C613A C613B C613C C614A C614B C614C C615A C615B C615C C616A C616B C616C C617A C617B C618 C619A C619B C620 C623 C624 C625A C625B C625C F601 F601 F602 F602 L605 L606 L607 L608 L609 P6...

Страница 48: ...SISTANCE I N WMS UNLESS OTHERWIE SPECIFIED S CTlON 90ufs 8 C SECTIONS 3O f 3OOWv K l000 OHMS M I MEGOHM A SEGTION 5 0 f 6dl C SECTIONS 2 5 f 450WV CAPACITANCE VALUES ONE AND OVER IN MICRO A El 6 SECTIONS lOpf 4 5 0 WV MICROFARADS LESS WAN ONE IN MICROFARADS UNLESS 0THERWISE SPECIF ED A 8 8 SECTIONS 2 5 f ZOO WV Figure 5 6 Schematic qiagram for Type 1391 6 Power Supply ...

Страница 49: ...riable wire wound B All resistances are in ohms unless otherwise indicated by k kilohms or M megohms C Capacitances are in micromicrofarads except as otherwise indicated by pf microfarads D Sections A B C are 90 30 30 pf respectively E Capacitances are in microfarads F Value determined in General Radio laboratory POWER TRANS I V603 450 300 REG Elementary Schematic Diagram for Type 1391 P2 Power Su...

Страница 50: ...sec cm DELAY SET FOR 4psec A DIRECT TRlG lOv cm B TP201 POS DEL GATE 50v cm C TP202 DEL SWEEP 50v cm D TP203 DEL RESET PULSE 50v cm E TP203 DEL RESET PULSE 50v cm F TP204 COINC GATE 50v cm 3psec G TP205 DELAY TRIG INV 5v cm H DELAYED SYNC 100v cm 4 SWEEP CIRCUITS 100 kc 6psec cm A SWEEP TRIGGER DELAYED 4psec lOv cm B GRID 7 V305 50v cm C POS GATE 50v cm D NEG GATE 50v cm E TP301 SWP GEN 100v crn F...

Страница 51: ... PULSE 6 START PULSE C V50l PLATE PIN 9 D V50l PLATE PIN 1 E TP501 MV NEG 20v cm F TP503 DRIVER GRlD POS 50v cm G TP502 MV POS 20v cm H TP504 DRIVER GRID NEG 50v cm 1 TP505 DRIVER PLATE NEG 20v cm J POS PULSE 94R 20v cm K TP506 DRIVER PLATE POS 20v cm L NEG PULSE 94R 20v cm ...

Страница 52: ...GENERAL RADIO COMPANY ...

Страница 53: ...TYPE 1391 8 PULSE SWEEP AND TIME DELAY GENERATOR ...

Страница 54: ...GENERAL RADIO COMPANY ...

Страница 55: ...TYPE 1391 8 PULSE SWEEP AND TIME DELAY GENERATOR CI l R103 CIO2 R108 R104 Figure 5 1 1 Left Side Interior View Ic w QD O k 0 0 0 0 KLZ t ...

Страница 56: ...GENERAL RADIO COMPANY Figure 5 12 Right Side Interior View ...

Страница 57: ...TYPE 1391 8 PULSE SWEEP AND TIME DELAY GENERATOR Figure 5 13 Top Interior View of Power Supply ...

Страница 58: ...GENERAL RADIO COMPANY Figure 5 14 Bottom Interior View of Power Supply ...

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GENERAL RADIO COMPANY 1391-B, Руководство по эксплуатации

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