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Tektronix FG 501 Instruction Manual
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Tektronix FG 501 Instruction Manual

Tektronix FG 501 Instruction Manual

Function generator
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COMMI
ED O EXCELLENCE
UNCTION
GENERATOR
G
501
INSTRUCTION
MANUAL

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Summary of Contents for Tektronix FG 501

  • Page 1 ektronix COMMI ED O EXCELLENCE UNCTION GENERATOR INSTRUCTION MANUAL...
  • Page 2 ektronix COMMI ED O EXCELLENCE UNCTION GENERATOR INSTRUCTION MANUAL ektronix, Inc. P.O. Box 500 Beaverton, Oregon 97077 Serial Number ______________________ irst printing August I972 070 1431-01...
  • Page 3 WARRAN Y his ektronix product is warranted against defective materials and workmanship, under normal use, for a period of one year from date initial shipment. ektronix will repair or replace, at its option, those products determined to be defective within the warranty period and returned, freight prepaid, to a ektronix Service Center.
  • Page 4 FG 501 ABLE OF CON EN S Page SECTION 1 OPERATING INSTRUCTIONS SECTION 2 SPECI ICATION AND PER ORMANCE CHECK ARNING HE FOLLOWING SERVICING INS RUC IONS ARE FOR USE BY QUALIFIED PER ­ SONNEL ONLY. O AVOID PERSONAL INJURY, DO NO PERFORM ANY SERVICING...
  • Page 5 Fig. 1-1. FG 501 Function Generator REV. B JUL 1978 FG 501...
  • Page 6 Because of the high current drawn by the available at the front panel. Variable DC offset of ±7.5 volts FG 501, it is also recommended that the power is also provided. A "hold" feature allows the generator module be turned off before removing the FG 501.
  • Page 7 Before using the FG 501 for the first time, read the identical loss and time-delay characteristics. Operating Considerations in this section and the description of the front-panel controls, connectors, and indicators in Fig.
  • Page 8 Operating Instructions — FG 501 RIG OU PU POWER Indicator Connector B SM connector that pro ­ vides a +2.5 V square ­ wave trigger output into a 600 Q load. FREQUENCY Hz Dial he frequency of sine, triangle square...
  • Page 9 Operating Instructions — FG 501 into a 50 O attenuator and a 50 Q termination at the oscilloscope input. The attenuator isolates the input capacity of the device. Distortion can be caused by this input capacity. A simple resistive impedance-matching network that provides minimum attenuation is illustrated in ig.
  • Page 10 G 501 output waveform. The number of cycles per burst can be approximated by dividing the gating signal duration by the period of the G 501 output frequency. Fig. 1-5. Output waveforms available from the FG 501. 3. Select the desired frequency with the MULTIPLIER selector and REQUENCY Hz dial.
  • Page 11 Operating Instructions — FG 501 frequency sweeps from the frequency set by the The phase (start level) of the waveform burst can be MULTIPLIER selector and REQUENCY Hz dial; i.e., a + varied ±90° by pulling out and turning the PHASEcontrol...
  • Page 12 Operating Instructions — FG 501 An input signal that varies symmetrically about a 0 V level will also sweep the generator symmetrically about the center frequency set by the MULTIPLIER selector and REQUENCY Hz dial as shown in ig. 1 -7(C).
  • Page 13 Operating Instructions — FG 501 APPLICA IONS Response Analysis 3. Apply the desired waveform to the VC INPUT G 501 is particularly suited for determining connector. (A positive-going waveform will sweep the response characteristics of circuits or systems. This frequency upwards from the REQUENCY Hz dial setting application utilizes the VC input of the G 501 to sweep while a negative-going waveform will sweep downwards.
  • Page 14 This application utilizes a ramp generator, such 3. Adjust the pulse generator period for the desired as the TEKTRONIX RG 501, as a VC signal source and a number of bursts within the selected ramp duration. pulse generator, such as the TEKTRONIX PG 501, as a Adjust the pulse generator duration for the desired burst gating signal source.
  • Page 15 Section 2 — FG 501 SPECIFICA ION AND PERFORMANCE CHECK SPECIFICA ION Performance Conditions Only those items listed in the Performance Re ­ quirements column of the Electrical Characteristicstable The electrical characteristics are valid only if the are normally verified when doing the Performance Check G 501 has been calibrated at an ambient temperature procedure of this manual.
  • Page 16 Specification and Performance Check — FG 501 able 2-1 (cont) Characteristic Performance Requirement Supplemental Information SN B130000-up: 20 V p-p open Power-supply limiting causes com ­ Amplitude (excluding offset) circuit. 10 V p-p into 50 Ω load. pression of output waveform when maximum amplitude and max ­...
  • Page 17 Specification and Performance Check — FG 501 able 2-1 (cont) Supplemental Information Characteristics Performance Requirement ~ J_ (see Operating Consider- Ramp Duration 2f ations). Applies to calibrated portion of 1% or less from 0.001 Hz to 1 Hz. Sine Wave Distortion dial only (1 to 10).
  • Page 18 Specification and Performance Check — FG 501 able 2-2 ENVIRONMEN AL CHARAC ERIS ICS Information Characteristics Temperature 0°C to 50° C. Operating — 40°Cto +75° C. Storage Altitude To 15,000 feet. Maximum operating temperature decreased by Operating 1° C/1 00 feet from 5000 to 15,000 feet.
  • Page 19 Specification and Performance Check — FG 501 PERFORMANCE CHECK Introduction Tolerances that are specified in this performance This procedure checks the electrical characteristics of check procedure apply to the instrument under test and do the G 501 that appear in the Specification section of this not include test equipment error.
  • Page 20 Specification and Performance Check — FG 501 able 2-4 (cont) Performance Description Requirement Application Example requency range from 1 Hz Check sine wave dis ­ Hewlett-Packard 334A Dis ­ Distortion tortion Analyzer or equiv ­ to at least 600 kHz. Dis ­...
  • Page 21 Specification and Performance Check — FG 501 d. Adjust the oscilloscope trigger level control for a g. Adjust the test oscilloscope trigger level to display the entire falling portion of the square wave. Check that stable display of approximately 1 cycle per division.
  • Page 22 Specification and Performance Check — FG 501 c. CHECK — the G 501 timing according to the 4. VCF INPU following chart. a. Set the G 501 controls as follows: Triangle UNCTION AM PL 1 ully cw SET 2 Counter...
  • Page 23 Specification and Performance Check — FG 501 b. Set the oscilloscope vertical for dc-coupling at h. Disconnect the 50 Ω cable and 50 Ω termination 2 V/div sensitivity. Set the triggering controls to internal, + from the digital voltmeter. slope. Set the time base sweep speed to 20 ps.
  • Page 24 Specification and Performance Check — FG 501 c. CHECK — the sine wave distortion at frequencies d. Adjust the pulse generator for a 2-volt square wave, and amplitudes as shown on the following chart: 0.1 ms duration and 0.2 ms period.
  • Page 25 WARNING OLLOWING SERVICING INSTRUCTIONS ARE OR USE BY QUALI IED PERSONNEL ONLY. TO AVOID PERSONAL INJURY, DO NOT PER ORM ANY SERVICING OTHER THAN THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE QUALI IED TO DO SO.
  • Page 26 Services Available Tektronix, Inc. provides complete instrument repair A flexible TM 500 extender cable, Tektronix Part No. and adjustment at local ield Service Centers and at the 067-0645-02, is useful for troubleshooting or adjusting the actory Service Center.
  • Page 27 G 501 on. from the power module. If the adjustments are to be made with the G 501 on an extender cable (Tektronix Part No. e. Connect all test equipment to a suitable line voltage 067-0645-02), be sure the extender cable is oriented with source and turn it on.
  • Page 28 Adjustment — FG 501 SN B130000-UP only. Fig. 3*1. Adjustment and test point locations, SN B020000 & up. 1431-14A Fig. 3-2. Adjustment and test point locations, below SN B020000. REV C, MAR 1979...
  • Page 29 Adjustment — FG 501 Initial Control Settings 5. Adjust Square-Wave High-frequency Compensation and Check Risetime Set the following controls during warm-up time: Control Setting Changes: FG 501 FG 501 UNCTION Triangle Square wave UNCTION AMPL 1 ully cw SET 2...
  • Page 30 Adjustment — FG 501 a. Connect the G 501 output through a 50 Q coaxial a. Set the REQUENCY Hz dial just to the point (near cable and 50 Q termination to the counter input (if the 10) where the frequency of the displayed waveform waveform is also to be displayed on an oscilloscope, insert becomes maximum and there is not further change.
  • Page 31 Adjustment — FG 501 able 3-2 a. ADJUST — C190 (10 s X10 Timing) for a counter reading of 1.0000 (note an oscilloscope display of about 1 cycle/division). FG 501 PERCEN FG 501 DIS OR ­ FRE ­ MUL I ­...
  • Page 32 Adjustment — FG 501 clockwise and the horizontal bars should move to at least a. Connect a 10X probe from the oscilloscope to test the top of the triangle burst waveforms. Rotate the PHASE point 6 (if TP6 is not present use point A, the circuit board control fully counterclockwise and the horizontal bar pad below C77 and right of R251).
  • Page 33 Adjustment — FG 501 b. ADJUST — R45 (X.1 Sym) so the upper and lower 9. Square-Wave High Frequency Compensation portions of the displayed square wave are of equal Control Setting Changes: duration. Oscilloscope 14. 10 5 X10 iming Time Base 2 μ...
  • Page 34 Those portions of the circuits located on circuit Freon compounds for cleaning the FG 501. Use only boards are enclosed with gray tint outline. clean water and a mild detergent.
  • Page 35 Maintenance and Interfacing Information — FG 501 esting Equipment Incorrect operation of all circuits often means trouble in power supplies. Using a multimeter, check first for Generally, wide-band oscilloscope, low- correct voltages of the individual regulated supplies capacitance probe, and a multimeter are all that is needed...
  • Page 36 Before you purchase or order a part from a source other than Tektronix, Inc., please check the electrical parts list for the proper value, 2. Remove all screws holding the board to the chassis rating, tolerance, and description.
  • Page 37 Loosen the coupling at the potentiometer at the rear of the switch, If the Tektronix instrument is to be shipped to a and pull the long shaft out of the switch assembly.
  • Page 38 Maintenance and Interfacing Information — FG 501 Plastic-Cased ransistors FE 'S Metal-Cased ransistors Power ransistors Integrated Circuits Indexing 1431-20 Integrated Circuits Mounting Fig. 4-1. Semiconductor device lead configurations found In the FG 501.
  • Page 39 Maintenance and Interfacing Information — FG 501 1431-19 Fig. 4-2. Input/output assignments at rear interface connector, rear view. more than the instrument dimensions. Cushion the Save and re-use the package in which your instrument instrument by tightly packing three inches of dunnage was shipped.
  • Page 40 Section 5 — FG 501 CIRCUI DESCRIP ION Introduction The following is a description of the electrical circuits in the G 501. Refer to the simplified block diagram and the detailed schematic diagrams on the foldout pages at the back of the manual to aid in understanding this description.
  • Page 41 Circuit Description — FG 501 generator is functioning. However, a positive voltage at Level Shifting pin 12 of U80D will disable the loop generator. Level shifting occurs in the circuit composed of Q125 and Q130. Q130 is a current source for Q125. Q130 also...
  • Page 42 Circuit Description — FG 501 When a positive or negative ramp waveform is selected which turns on Q295 and pulls the output up. If Q276 turns by S250, a lower resistance is switched into the positive or on (i.e., Q270 turns off when a negative voltage is applied negative current sources, depending on the polarity of the to its base), Q280 turns on, which turns on Q285.
  • Page 43 Section 6 — FG 501 OP IONS There are no options for the G 501 at this time.
  • Page 44 Section 7 — FG 501 REPLACEABLE ELEC RICAL PAR S PAR S ORDERING INFORMA ION . Replacement parts are available from or th rough 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 45 Replaceable Electrical Parts — FG 501 CROSS INDEX-MFR. CODE NUMBER O MANUFAC URER City, State, Zip anufacturer Address fr. Code SANGAMO ELECT IC CO., S. CA OLINA DIV. P 0 BOX 128 PICKENS, SC 29671 00853 MILWAUKEE, WI 53204 01121...
  • Page 46 Replaceable Electrical Parts — FG 531 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description Code fr Part Number B125502 CKT BOA D ASSY:MAIN 670-2105-00 B010100 80009 670-2105-00 670-2105-01 B125503 B129999 CKT BOA D ASSY :MAIN 80009...
  • Page 47 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description Code fr Part Number C406 290-0524-00 CAP ., FXD,ELCTLT :4. 7UF ,20%, 10V 90201 TDC475M010EL B010100 CAP.,FXD,CE DI:0.001UF, +100 — 0%, 500V...
  • Page 48 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description fr Part Number Code 131-0679-02 B103150 B125502 CONNECTO , CPT, :BNC W/HA DWA E 24931 28J 270-1 J290 CONNECTO , CPT,:BNC 91836...
  • Page 49 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description Code fr Part Number B130000 ES. ,FXD,CMPSN:9.1K, (NOM VALUE) ,SEL 01121 CB9125 315-0912-00 71450 201-YA5551 ES.,VA NONWI :5K OHM,30%,0.25W 311-1314-00 02111 140-9504 ES.,VA...
  • Page 50 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description Code fr Part Number 321-0235-00 ES.,FXD,FILM:2.74K OHM,1%,0.125W B020000 91637 MFF1816G27400F B019999X 311-1308-00 B010100 ES. ,VA ,NONWI :250 OHM,30%,0.25W 71450 201-YA5550 315-0202-00 B010100 B019999 ES.
  • Page 51 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description Code fr Part Number B019999 ES. ,VA ,NONWI :10K OHM,30%,0.25W 71450 311-1199-00 B010100 201-YA5543 17 0 311-1120-00 B020000 ES. ,VA ,NONWI :100 OHM, 30%,0. 25W...
  • Page 52 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description Code fr Part Number ES.,FXD,CMPSN:24 OHM,5%,0.25W 315-0240-00 01121 CB2405 ES. , FXD,CMPSN: 4. 7K OHM,5%,0.125W 317-0472-00 01121 BB4725 ES. , FXD,CMPSN: 820 OHM,5%,0.25W...
  • Page 53 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Ckt No. Part No. Dscont Name & Description Code fr Part Number 315-0102-00 ES. , FXD,CMPSN:IK OHM,5%,0.25W 01121 CB1025 315-0332-00 ES. , FXD,CMPSN: 3. 3K OHM,5%,0.25W 01121 CB3325 B079999 MFF1816G90900F...
  • Page 54 Replaceable Electrical Parts — FG 501 Tektronix Serial/ odel No. Code fr Part Number Ckt No. Part No. Dscont Name & Description MIC OCI CUIT,DI:QUAD 2-INPUT POS NO GATE 80009 156-0043-00 156-0043-00 MIC OCI CUIT,LI:DUAL COMPA ATO 04713 MC1711CL U195...
  • Page 55 The overline on a signal name indicates that the signal performs its intended function when it goes to the low state. Abbreviations are based on ANSI Y1. 1-1972. Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are: Y14.15, 1966 Drafting Practices.
  • Page 56 GRID LOCA ION CHAR (SN B020000-BELOW) GRID CK GRID CK GRID CK GRID CK GRID CK GRID LOC NO LOC NO CR230 R294 VR80 R158 CR240 VR85 R159 R295 CR242 VR150 R296 C72f R160 CR245 VR170 C73f R297 R161 CR246 VR195 R299 R162...
  • Page 57 IMPONEN LOCA ION GRID Below SN B020000 * See Parts List for serial number ranges, t Located on back of board.
  • Page 58 COMPONEN Below SN BOS...
  • Page 60 G 501 BLOCK DIAGRAM...
  • Page 61 GRID LOCA ION CHAR (SN B020000-UP) 3RID GRID 3RID GRID GRID GRID R281 U460 R150 CR178 R151 R282 U470 CR180 R152 R284 U480 CR182 C72t R153 R285 CR215 C73t R155 R286 CR218 C74f R156 R290 VR80 C75f CR230 CR235 R158 R291 VR85 C76f...
  • Page 62 OCA IONGRID * See Parts List for serial number ranges, f Located on back of board. Alternate location.
  • Page 63 COMPONEN LOC SN B020000-UP REV G, JUN 1978...
  • Page 64 Waveform conditions: FREQUENCY Hz dial Variable 10 3 MUL IPLIER PHASE in (off) in (off) OFFSE sinewave FUNC ION fully clockwise AMPL 0 P7 U195-10 U195-9 U195-3 U195-13...
  • Page 66 GENERA OR...
  • Page 67 \4-BI- Ife Q 501 utput R.6.V H,JUL- 1*118...
  • Page 68 (431- I4> utput mplifier witch etails...
  • Page 69 8L©innr ‘ 9 A=ra ios !)J...
  • Page 70 ower upply 50 3 ULI 91 a...
  • Page 71 Section 9 — FG 501 REPLACEABLE MECHANICAL PAR S PAR S ORDERING INFORMA ION INDEN A ION SYS EM 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 72 Replaceable Mechanical Parts — FG 501 CROSS INDEX-MFR. CODE NUMBER O MANUFAC URER fr. Code anufacturer Address City, State, Zip ISBU G, PA 17105 00779 AMP, INC. P 0 BOX 3608 01295 TEXAS INST UMENTS, INC., SEMICONDUCTO P 0 BOX 5012, 13500 N CENT AL...
  • Page 73 Replaceable Mechanical Parts — FG 501 Fig. & Index Tektronix Serial/ odel No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code fr Part Number 337-1399-00 SHLD , ELECT ICAL : SIDE 80009 337-1399-00 B010100 B019999...
  • Page 74 Replaceable Mechanical Parts — FG 501 Fig. & Index Tektronix Serial/ odel No. Dscont Qty 1 2 3 4 5 Name & Description Code fr Part Number Part No. ASSYjSP DCN: 10539 4511/DAF 1-27 401-0206-00 (ATTACHING PA TS) SC ,TPG,THD CTG:4-24 X 0.25 INCH,PNH STL...
  • Page 75 Replaceable Mechanical Parts — FG 501 Fig. & Index Tektronix Serial/ odel No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code fr Part Number 73743 2X12161-402 1-63 210-0406-00 . NUT,PLAIN,HEX. :4-40 X 0.188 INCH,B S...
  • Page 77 G 501 UNCTION GENERATOR...
  • Page 78 ACCESSORIES Fig. & Index ektronix Serial/Model No. Name & Description Code Mfr Part Number Part No. Eff Dscont 80009 012-0127-00 2- 1 012-0127-00 CABLE ASSY, F :18.50 INCHES LONG MANUAL,TECH:INST UCTION 80009 070-1431-01 070-1431-01 G 501 UNCTION GENERATOR REV. C JUN 1978...
  • Page 79 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 80 CALIBRA ION ES EQUIPMEN REPLACEMEN Calibration est Equipment Chart his chart compares M 500 product performance to that of older ektronix equipment. Only those characteristics where significant specification differences occur, are listed. In some cases the new instrument may not be a total functional replacement. Additional support instrumentation may be needed or a change in calibration procedure may be necessary.
  • Page 81 Tektronix MANUAL change information coMMrrrED Change Reference: C6/ 479 _____________ Date: 4-3-79 _____ to excellence Product : FG 501 070-1431-01 _______________________________________________________________ CHANGE DESCRIPTION SCHEMATIC CO ECTION DIAG AM <2> OUTPUT AMPL & SWITCH DETAILS- Partial TEXT CO ECTION Page 2-2...