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Tektronix TG 501 Instruction Manual
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Tektronix TG 501 Instruction Manual

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G 501
IME MARK
GENERA OR
NSTRUCT ON
MANUAL

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Summary of Contents for Tektronix TG 501

  • Page 1 ektronix G 501 IME MARK GENERA OR NSTRUCT ON MANUAL...
  • Page 2 lëktronix COMMI ED O EXCELLENCE PLEASE CHECK FOR CHANGE INFORMA ION HE REAR OF HIS MANUAL. G 501 IME MARK GENERA OR NSTRUCT ON MANUAL ektronix, Inc. P.O. Box 500 Beaverton, Oregon 97077 Serial Number ----------------------------------- First Printing OC 1978 070-1576-02 Revised FEB 1984 Product Group 75...

  • Page 3: Table Of Contents

    G 501 ABLE OF CON EN S Page LIS OF ILLUS RA IONS ........................Section 1 Specification ......................Section Operating nstructions ..................WARNING HE FOLLOWING SERVICE INS RUC IONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. O AVOID PERSONAL INJURY, DO NO PERFORM ANY SERVICING O HER CON AINED IN OPERA ING INS RUC IONS UNLESS YOU ARE QUALIFIED...
  • Page 4 LIS OF ILLUS RA IONS Figure Page Plug-in installation and removal ..............Controls and Connectors .................. Timing error of time base ................Measuring timing error of time base ............Markers approximately at pulse duration and period ......Measuring pulse duration .................. 2- 7 Measuring pulse period ................
  • Page 5 G 501 OPERA ORS SAFE Y SUMMARY The general safety information in this part of the summary power cord into a properly wired receptacle before is for both operating and servicing personnel. Specific connecting to the product input or output terminals. A warnings and cautions will be found throughout the protective ground connection by way of the grounding manual where they apply, but may not appear in this...
  • Page 6 G 501 SERVICE SAFE Y SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Refer also to the preceding Operators Safety Summary. Disconnect power before removing protective panels, Do Not Service Alone soldering, or replacing components. Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present.
  • Page 7 G 501 G 501 ime Mark Generator REV B JAN 1977...
  • Page 8 SPECIFICA ION IN RODUC ION Description The TG 501 is a general purpose Time Mark Generator waves are selected by self-canceling push-buttons when plug-in designed to operate in a TM 500 Series Power the rotary switch is in the 521 n position.

  • Page 9: Specification

    Specification — G 501 able 1-1 (cont) Supplemental Information Characteristics Performance Requirement External Reference nput Lift pin 3 of U350 from socket; (Available Only if U50 and C and jumpers for 5 or 10 MHz, jumpers are installed and U100 1 MHz external reference requires is removed) jumpers.
  • Page 10 Specification — G 501 able 1-3 PHYSICAL CHARAC ERIS ICS Characteristics Description Anodized aluminum panel and chassis Finish Net Weight 2 lbs., 4 oz. (1 kg.) Dimensions 2.633 in. (66.8 mm) w x 11.240 in. (285.3 mm) d x 4.961 in. (125.9 mm) h REV C AUG 1980...
  • Page 11 Power Module. Check the front-panel of the in; otherwise, damage may occur to the plug-in Generator to see that the knob skirt is lighted. The TG 501 circuitry. is designed to operate in any compartment of a TM 500 Series Power Module.

  • Page 12: Operating Nstructions

    Operating Instructions — G 501 MARKER OU Connector ( 5 ) Provides positive markers of ≥ 1 V peak amplitude into 50 Ω for 5 s through 10 ns selected by MARKER Control rotary switch. Provides markers of ≥ 1 V peak-to-peak amplitude into 50 Ω...
  • Page 13 ­ described in the manual. Use the following examples to cule line. become familiar with the TG 501 ’ s VAR ABLE T M NG READOUT. Contact your Tektronix Field Office or representative for making specific measurements with this instrument.
  • Page 14 Fig. 2-5. step 9 to find the percentage of error from standard timing. 5. Use the MARKER Control switch of the TG 501 to display one time marker approximately at pulse duration and one at pulse period. Align the first time marker with the beginning of pulse wave-form.
  • Page 15 S RENG H REPACKAGING FOR SHIPMEN Gross Weight (lb) Carton est Strength (lb) f the Tektronix instrument is to be shipped to a 1-10 Tektronix Service Center for service or repair, attach a tag 10-30 showing: owner (with address) and the name of an...

  • Page 16: Theory Of Operation

    Section 3 — G 501 HEORY OF OPERA ION DIAGRAMS 1 & 2 1 MHz Crystal Reference and Enable Gate The input signal to the loop amplifier/filter is amplified and inverted by operational amplifier U250. The output of The reference frequency is supplied by the 1 MHz U250 is kept from changing rapidly by C250 and C251.
  • Page 17 heory of Operation — G 501 Assume that the frequency has been correct up to this 20 ns and .3 µs Divide-By- wo Counters cycle, pins 9 and 12 of U150 are low. When the 1 MHz The 20 ns ÷ 2 counter contains U315B, U290B and variable clock frequency is slower than 1 MHz, the U290A.
  • Page 18 heory of Operation — G 501 Fig. 3-1. Functional block diagram of schematic diagrams 1 and 2 circuitry. REV B AUG 1980...
  • Page 19 heory of Operation — G 501 DIAGRAM 3 Decade Dividers 10 ns, 20 ns, 50 ns Marker Output Amplifier The decade dividers operate continuously; however, Q390 and Q400 form an emitter coupled switch that is the output is selected by enabling the appropriate enable controlled by U300D, and ECL enable logic gate.
  • Page 20 heory of Operation — G 501 Fig. 3-2. Functional block diagram of schematic diagram 3 circuitry. REV C AUG 1980...
  • Page 21 heory of Operation — G 501 DIAGRAM 4 X2 Push-Push Amplifier and 5 ns Filter CR500 is a snap type varactor, i.e., a varactor that snaps off. The varactor is triggered at a 100 MHz rate. The Placing the MARKER (SEC) switch at its 521 n position sudden current change that occurs when CR500 snaps off enables ECL logic gate U290C, which allows the 100 MHz at its 100 MHz rate causes L502 (part of the etched circuit...
  • Page 22 heory of Operation — G 501 Fig. 3-3. Functional block diagram of schematic diagram 4 circuitry. REV C AUG 1980...
  • Page 23 heory of Operation — G 501 DIAGRAM 5 ERROR DISPLAY The decoder drivers U550 and U570 are driven by the output signals of the counter circuitry, U195 and U200. U550 output drives the .1% LED display device DS550 while U570 output drives the 1% LED display device DS570.
  • Page 24 heory of Operation — G 501 Fig. 3-3. Functional block diagram of schematic diagram 4 circuitry. REV C AUG 1980...
  • Page 25 heory of Operation — G 501 Fig. 3-4. Functional block diagram of schematic diagram 5 circuitry. REV B AUG 1980...
  • Page 26 heory of Operation — G 501 DIAGRAM 6 POWER SUPPLY +5 Volt Supply The regulator for the +5 V supply consists of error +15 Volt Supply sensing amplifier U625, short circuit protection transistor The regulator for the +15 V supply consists of error Q620, over-voltage protection circuit VR640-Q640 and a Darlington transistor pair (Q635 and a series-pass tran ­...
  • Page 27 WARNING THE FOLLOW NG SERV C NG NSTRUCT ONS USE BY QUAL F ED PERSONNEL ONLY. TO AVO D PERSONAL NJURY, DO NOT PERFORM ANY SERV C NG OTHER THAN THAT CONTA NED OPERAT NG NSTRUCT ONS UNLESS YOU ARE QUAL F ED TO DO SO. REFER TO OPERATORS SAFETY SUMMARY AND SERV CE SAFETY SUMMARY PR OR TO PERFORM NG ANY SERV CE.
  • Page 28 G 501 will be and adjustment at local field service centers and at the correct only when the OU PU S are terminated in factory service center. Contact your local Tektronix field office or representative for further information. 50 Ω.

  • Page 29: Calibration Procedure

    TG 501 VAR ABLE T M NG. able 4-2 G 501 ERROR DC 503 d. Turn TG 501 VAR ABLE T M NG full cw and full ccw. ±.1% 9.990 to 10.010 kHz 0.0% 5.0% FAST ±.1% 10.490 to 10.510 kHz...
  • Page 30 Set TG 501 MARKER (SEC) control to each position c. Connect TG 501 1 µs time marker (via a 50 Ω cable on the dial (.1 µs through 5 s).
  • Page 31 Remove 50 Ω cables from vertical amplifier nput and time base Ext Trig n. c. Connect 50 Ω cable from TG 501 + TR GGER OUT to sample sweep unit Ext nput. i. Connect 50 Ω cable from time base Ext Trig n to the TG 501 MARKER OUT.

  • Page 32: Adjustment Procedure

    999,990 Hz. Preparation Access to the internal adjustments is achieved most easily when the TG 501 is connected to the power module f the frequency is not within these limits, adjust with a flexible plug-in extender. Make adjustments at an C102 for exactly 1 MHz.
  • Page 33 Connect a 50 Ω coaxial cable (the sampling scope f the frequency is not within these limits, remove the input is 50 Ω) from the TG 501 MARKER OUT to the input multiplier board, remove the screw in the TXCO and adjust of the sampling oscilloscope.
  • Page 34 Calibration Procedure — G 501 Adjustment Procedure c. Remove the coaxial output cable from the TG 501 e. Adjust C515 so the amplitude of the 1 ns marker is over 200 mV peak-to-peak and the amplitude of the 2 ns MARKER OUT connector and connect it to the 1 ns ONLY connector.
  • Page 35 Section 5 — G 501 MAIN ENANCE in the absence of a malfunction are not recommended as GENERAL preventive maintenance measures. See the semiconduc ­ tor checking information under Troubleshooting Techni ­ Introduction ques which follow. A convenient time to perform preven ­ This section of the manual is meant to support the tive maintenance is just before instrument calibration.

  • Page 36: Maintenance

    Maintenance — G 501 System and Associated Equipment rear of the switch. The charts indicate with a solid dot when each contact is closed. Before troubleshooting the TM 500 Series system, check that the instruments in the system are operating correctly.
  • Page 37 Before you purchase or order a part from a source other mance under operating conditions. A transistor can most than Tektronix, nc., check the electrical parts list for the effectively be checked by substituting a new component proper value rating, tolerance and description.
  • Page 38 An extracting tool should be used to remove the 14- and 16-pin integrated circuits to prevent damage to the pins. instrument. This tool is available from Tektronix, nc. Order Tektronix Part No. 003-0619-00. f an extracting tool is not available, use care to avoid damaging the pins. Pull slowly and 3.
  • Page 39 Maintenance — G 501 Fig. 5-1. Semiconductor device lead configurations found in the M 500 family. REV MAY 1982...
  • Page 40 3/8 inch, 7/16 inch No. 12 and No. 14 7. Open End Wrench 11/16 inch General Hex Wik No. 887-10 Unsoldering 8. Solder Wick Tektronix Part No. Cam switch 9. Lubricant Versilube lubration 006-1353-00 Tektronix Part No. Cam switch 10. Spray Cleaner...
  • Page 41 Maintenance — G 501 Static-Sensitive Components 9. Use a soldering iron that is connected to earth ground. 10. Use only special antistatic suction type or wick type desoldering tools. Static discharge can damage any semiconductor component in this instrument. able 5-2 RELA IVE SUSCEP IBILI Y O This instrument contains electrical components that S A IC DISCHARGE DAMAGE...
  • Page 42 Maintenance — G 501 REAR CONNECTOR P N ASS GNMENTS able 5-3 Will drive 5 TTL loads Marker Out Trigger Out Common Marker Out Common Trigger Out Buffered nternal Clock Output Common Data Good Buffered nternal Clock Output External Clock nput Common External Clock nput Not Used Data Good Common...
  • Page 43 Maintenance — G 501 OPERA ING CONSIDERA IONS Standard Clock The internal reference of the TG 501 is a 1 MHz crystal. f Option 01 is ordered, a high accuracy 5 MHz crystal is Remove U100 and disconnect pin 3 of U350 before provided and ntegrated Circuit U50 is installed on the using an external clock.
  • Page 44 Good pulse goes high and stays high for about 8 ms, which coincides with the LED display time. This output pulses of the TG 501 for external use. To connect the internal 1 MHz clock pulses via a buffer to contact 25A, will drive at least 2 TTL loads (3.2 mA).
  • Page 45 OP IONS OP ION 01 The TG 501 Option 01 is equipped with a temperature-compensated, 5 MHz crystal oscillator for a highly stable and precise internal clock. U50 provides countdown circuitry for the 5 MHz crystal. Remove U100 and disconnect pin 3 of U350 before using external clocks. To disconnect Pin 3 remove U350, bend pin 3 out then insert U350 back into circuit board.
  • Page 46 Section 7 — G 501 REPLACEABLE ELEC RICAL PAR S PAR S ORDERING INFORMA ION Replacement parts are available from or through your local ektronix, Inc. Field Office or representative. Changes to ektronix instruments are sometimes made to accommodate improved components as they become available, and to give you the benefit of the latest circuit improvements developed in our engineering department.
  • Page 47 299 1 TH AVE. S. W. 75 42 TRW ELECTRONIC COMPONENTS, IRC FIXED 4 1 N. BROAD ST. PHILADELPHIA, PA 191 8 RESISTORS, PHILADELPHIA DIVISION TEKTRONIX, INC. BOX 5 BEAVERTON, OR 97 77 MALLORY CAPACITOR CO., DIV. OF 3 29 E. WASHINGTON STREET...
  • Page 48 Replaceable Electrical Parts — G 501 Tektronix Serial/Model No. Mfr Part Number Name & Description Part No. Dscont kt No. 67 -2737- B 1 1 B 29999 CKT BOARD ASSY:MAIN 67 -2737- (STANDARD ONLY) 67 -2737- 2 B 31769 CKT BOARD...
  • Page 49 Replaceable Electrical Parts — G 501 Serial/Model No. Tektronix Mfr Part Number Dscont Name & Description Part No. kt No. 283- XB 1 21 CAP.,FXD,CER DI : 1UF, 1 % ,2 56289 19C6 7 (STANDARD ONLY) C 1 5 283- XB 1 26 CAP.,FXD,CER DI: .
  • Page 50 Replaceable Electrical Parts — G 501 Tektronix Serial/Model No. Mfr Part Number Name & Description kt No. Part No. Dscont C439 281- 523- CAP. , FXD.CER DI : 1 PF,+/-2 PF,5 72982 3 1- U2M 1 1M 281- 511- CAP. , FXD.CER DI : 22PF,+/-2 . 2PF,5...
  • Page 51 Replaceable Electrical Parts — G 501 Serial/Model No. Tektronix Mfr Part Number Name & Description Part No. Dscont kt No. 283- 156- CAP ., FXD , CER DI : 1 OOOPF , +1 - %, 2 72982 811 1A2 8Z5U 1 2Z...
  • Page 52 Replaceable Electrical Parts — G 501 Tektronix Serial/Model No. Mfr Part Number Name & Description kt No. Part No. Dscont 159- FUSE , CARTRIDGE : 3AG , 2A , 25 V , FAST-BLOW AGC 2 131- 566- BUS CONDUCTOR:DUMMY RES, 2. 375,22 AWG...
  • Page 53 Replaceable Electrical Parts — G 501 Serial/Model No. Tektronix Mfr Part Number Name & Description Dscont kt No. Part No. Q265 151- 221- TRANSISTOR : SILICON , PNP 4713 SPS246 SPS8246 TRANSISTOR : SILICON,NPN 4713 151- 424- Q272 4713 SPS246...
  • Page 54 Replaceable Electrical Parts — G 501 Tektronix Serial/Model No. Mfr Part Number Name & Description Part No. Dscont kt No. 315- 222- 1121 RES. , FXD,CMPSN: 2. 2K OHM,5%, .25W CB2225 (STANDARD ONLY) R1 5 315- 222- RES. , FXD,CMPSN: 2. 2K OHM,5%, .25W...
  • Page 55 Replaceable Electrical Parts — G 501 Tektronix Serial/Model No. kt No. Part No. Dscont Name & Description Mfr Part Number 315- 561- 1121 RES. , FXD , CMPSN : 56 OHM,5Z, .25W CB5615 R151 315- 273- RES. , FXD , CMPSN : 27K OHM,5Z,O.25W...
  • Page 56 Replaceable Electrical Parts — G 501 Tektronix Serial/Model No. kt No. Part No. Dscont Name & Description Mfr Part Number R325 315- 471- RES. , FXD , CMPSN : 47 OHM,5Z, .25W 1121 CB4715 1121 RES ., FXD , CMPSN : 15 OHM,5%, .25W...
  • Page 57 Replaceable Electrical Parts — G 501 Serial/Model No. Tektronix Mfr Part Number Name & Description Part No. Dscont kt No. R415 315- 39 - B 1 1 B 1 261 RES. , FXD , CMPSN : 39 OHM,5%, .25W 1121...
  • Page 58 Replaceable Electrical Parts — G 501 Tektronix Serial/Model No. Mfr Part Number Name & Description kt No. Part No. Dscont R553 315- 271- RES. , , FXD , CMPSN: 27 1121 CB2715 OHM,5%, .25W R554 315- 271- RES. , , FXD , CMPSN: 27 OHM,5%, .25W...
  • Page 59 Replaceable Electrical Parts — G 501 Serial/Model No. Tektronix Mfr Part Number Name & Description Part No. Dscont kt No. 156- MICROCIRCUIT , DI : DECADE COUNTER , TTL 156- 156- MICROCIRCUIT,DI : DECADE COUNTER,TTL 156- U212 156- MICROCIRCUIT,DI:DECADE COUNTER,TTL...
  • Page 60 Other ANS standards that are used in the preparation (µF). Resistors = Ohms (Ω). of diagrams by Tektronix, nc. are: he information and special symbols below may appear in this manual.. Assembly Numbers and Grid Coordinates The schematic diagram and circuit board component location illustration have grids.
  • Page 61 C 1 02 R145 R445. 1576-10 Fig. 8-1. Back of A1 main board. C510 C511 C504 C512 C505 / R500 C513 C517 C518 C519 C520 C450 C465 C467 Fig. 8-2. A2 multiplier circuit board. 1576-11...
  • Page 62 Al COMPONEN LOC GRID...
  • Page 63 Fig. 8-3. Al-Main board component location grid. For Option 1 — Components in shaded area are replaced by Y50 and U50. U50 is installed on the back side of board. REV JAN 1984...
  • Page 64 Fig. 8-4. Component location grid for back of Al — Main board.
  • Page 65 G 501 Fig. 8-5. A3 — Display board and A2 — Multiplier...
  • Page 66 >r board component location grid. REV JAN 1984...
  • Page 67 Fig. 8-6. Partial A2 — Multiplier board component location grid. (Standard SN B010100 - B032459, Option 1 SN B010100 - B032499)
  • Page 68 Readout Logic & Xk P/O A1 ASSY Phase Lock Loop CIRCUI BOARD SCHEMA IC CIRCUI SCHEMA IC BOARD BOARD CIRCUI SCHEMA IC LOCA ION LOCA ION LOCA ION LOCA ION NUMBER LOCA ION NUMBER NUMBER LOCA ION R283 R285 C100** R286 C102 t R53f*...
  • Page 70 High Speed Dividers & oS P/0 A1 ASSY r o . o 5,2,1 Sequencing Logic BOARD CIRCUI SCHEMA IC BOARD CIRCUI SCHEMA IC LOCA ION LOCA ION LOCA ION NUMBER NUMBER LOCA ION S350-3 C330 S350-4 C331 S350-5 L323* Q330 R300 U290A R302...
  • Page 72 Decade Divider & P/0 A1 ASSY Output Amplifier BOARD BOARD CIRCUI SCHEMA IC CIRCUI SCHEMA IC LOCA ION LOCA ION NUMBER LOCA ION LOCA ION NUMBER R380 C352 R381 C355 C358 R383 R384 C360 R385 C362 R387 C366 R390 C368 R391 C370 R393...
  • Page 74 Multiplier P/O A2 ASSY BOARD CIRCUI SCHEMA IC SCHEMA IC BOARD CIRCUI LOCA ION NUMBER LOCA ION LOCA ION LOCA ION NUMBER L510 C450 L511 C452 L512 C454 L513 C455 L517 C457 L518 C458 L519 C462 L520 C465 C467 Q460* C481 Q484 C489...
  • Page 76 Display & Switch Details P/0 A1 ASSY BOARD CIRCUI SCHEMA IC BOARD CIRCUI SCHEMA IC LOCA ION NUMBER LOCA ION LOCA ION NUMBER LOCA ION Q270 J452 J570 S350 J571 Display & Switch Details P/O A3 ASSY R557 DS550Î R558 DS570f R559 R570...
  • Page 78 Power Supply P/O A3 ASSY CIRCUI SCHEMA IC BOARD BOARD CIRCUI SCHEMA IC LOCA ION LOCA ION LOCA ION LOCA ION NUMBER NUMBER DS630 R629 P/0 A1 ASSY Power Supply R603 C610 R605 C615 R606t* 0616 R607 C624 R610 C626 R612 C640 R614...
  • Page 80 Section 9 — G 501 REPLACEABLE MECHANICAL PAR S INDEN A ION SYS EM PAR S ORDERING INFORMA ION his mechanical parts list is indented to indicate item Replacement parts are available from or through your local relationships. Following is an example of the indentation system ektronix, Inc.
  • Page 81 SHAKEPROOF DIVISION ST. CHARLES ROAD BAY ST. MILWAUKEE, WI 532 7 798 7 WROUGHT WASHER MFG. CO. BEAVERTON, OR 97 77 TEKTRONIX, INC. BOX 5 CRESCENT DR. BROADVIEW, IL 6 153 CENTRAL SCREW CO. 83385 6Ö 18TH AVE. ROCKFORD, IL 611 1 939 7 CAMCAR SCREW AND MFG.
  • Page 82 Replaceable Mechanical Parts — G 501 Fig. & Index Tektronix Serial/Model No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Mfr Part Number 337-1399- B 1 1 SHLD,ELECTRICAL:SIDE 337-1399- B 1 2 9 337-1399- 337-1399- B 1 21...
  • Page 83 Replaceable Mechanical Parts — G 501 Fig. & Index Tektronix Serial/Model No. Part No. Tscont 1 2 3 4 5 Name & Description Mfr Part Number 1 -21 CRT BOARD ASSY:DISPLAYtSEE A3 REPL) (ATTACHING PARTS) SCR,TPG,TF: 4-24 X .188 INCH.PNH STL...
  • Page 84 Replaceable Mechanical Parts — G 501 Fig. & Index Tektronix Serial/Model No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Mfr Part Number 1 -49 . RESISTOR,VAR:(SEE R135 REPL) (ATTACHING PARTS) 73743 2X2 317-4 2 21 - 583- .
  • Page 85 Replaceable Mechanical Parts — G 501 Fig. & Index Tektronix Serial/Model No. Part No. Dscont 1 2 3 4 5 Name & Description Mfr Part Number 198-219 - WIRE SET,ELEC: 198-219 - 22526 47439 . CONNECTOR,TERM: 22-26 AWG.BRS& CU BE GOLD...
  • Page 86 REV. C JAN 1978...
  • Page 87 FIG. 1 EXPLODED...
  • Page 89 ACCESSORIES Fig. & Index Tektronix Serial/Model No. Mfr Part Number N ame & Description Part No. Dscont Qty 1 2 3 4 5 ACCESSORIES 070-1576-02 80009 MANUAL,TECH:INSTRUCTION 070-1576-02 G 501 REV E JUL 1980...
  • Page 90 MANUAL CHANGE INFORMA ION At Tektronix, we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested. Sometimes, due to printing and shipping requirements, we can ’ t get these changes immediately into printed manuals.
  • Page 91 ^ktroniX' change information MANUAL coMMrrreo Date : 1 -18-83 __________ Change Reference: M45764 _________ to excellence Prndiict' TG^Ol TIME MARK GENERATOR _______________________ Manual Part No.: 7 — 1576 — 2 ______ DESCRIPTION PG75 EFFECTIVE SERIAL NUMBER: BO492OO, B 4 932 - Option CHANGE TO: (New Mechanical Package) Figure numbers refer to the mechanical exploded view.
  • Page 92 ektronix® information MANUAL CHANGE Date: _12-21-83 _________ Change Reference: M53O47 _________ committed to excellence p rodu ct: TG5O1 TIME MARK GENERATOR ___________ Manual Part No.: 7 -1376- 2 DESCRIPTION PG 75 ---- This insert also includes M52989 . ---- Effective Serial No. B 492 , B 4932 (Option CHANGE TO:...