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Tektronix CFG280 manual

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Table of contents for the manual

  • Page 1

    User Manual CFG280 1 1 MHz Function Generator 070-8559-03[...]

  • Page 2

    Copyright  T ektronix, Inc. 1991. All rights reserved. T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. T ektronix, Inc., P .O. Box 1000, W ilsonville, OR 97070–1000 TEKTRONI[...]

  • Page 3

    W ARRANTY T ektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, T ektronix, at its option, either will repair the defective product without charge for parts and labor , or will provide a re[...]

  • Page 4

    [...]

  • Page 5

    CFG280 User Manual i T able of Contents General Safety Summary iii . . . . . . . . . . . . . . . . . . . . . . . . . . . . Getting Started 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preparing the Function Generator for Use 2 . . . . . . . . . . . . . . . . . Front Panel 4 . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 6

    T able of Contents ii CFG280 User Manual[...]

  • Page 7

    CFG280 User Manual iii General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. Injury Precautions Use Proper Power Cord T o avoid fire hazard, use only the power cord specified for this product. A void Electric Overload T o avoid electric shock or fire hazard[...]

  • Page 8

    General Safety Summary iv CFG280 User Manual Do Not Operate in Wet/Damp Conditions T o avoid electric shock, do not operate this product in wet or damp conditions. Do Not Operate in Explosive Atmosphere T o avoid injury or fire hazard, do not operate this product in an explosive atmosphere. Product Damage Precautions Use Proper V oltage Setting Bef[...]

  • Page 9

    General Safety Summary CFG280 User Manual v CAUTION. Caution statements identify conditions or practices that could r esult in damage to this pr oduct or other pr operty . T erms on the Product These terms may appear on the product: DANGER indicates an injury hazard immediately accessible as you read the marking. W ARNING indicates an injury hazard[...]

  • Page 10

    General Safety Summary vi CFG280 User Manual[...]

  • Page 11

    CFG280 User Manual 1 Getting Started The T ektronix CFG280 Function Generator produces low distortion sine waves, square waves, triangle waves, TTL sync signals, positive and negative pulses, and ramp waveforms in a frequency range of 0.1 Hz to 1 1 MHz. Y ou can also directly control amplitude and DC offset. The sweep function makes the output sign[...]

  • Page 12

    Getting Started 2 CFG280 User Manual Preparing the Function Generator for Use Check the following items prior to operating the CFG280 Function Generator for the first time (see Figure 1 for locations of items 1 through 3): 1 2 3 Figure 1: Line V oltage Selectors, Power Input, and Fuse Locations CAUTION. T o pr event damage to the instrument, set th[...]

  • Page 13

    Getting Started CFG280 User Manual 3 W ARNING. T o prevent electrical shock, unplug the power cor d and disconnect the signal cable fr om any signal sour ce befor e checking or r eplacing the fuse. 2. Check that the correct line fuse is installed. The line fuse provides protection if the equipment malfunctions or an overload occurs. Refer to Append[...]

  • Page 14

    Getting Started 4 CFG280 User Manual Front Panel Figure 2 shows the front-panel controls, connectors, and indicators of the CFG280 Function Generator . 3 1 2 45 6 7 89 18 20 22 21 23 19 17 16 15 14 13 12 10 1 1 24 25 Figure 2: Front Panel Controls, Connectors, and Indicators 1. OVERRANGE LED . Lights if you apply a frequency above specified limits [...]

  • Page 15

    Getting Started CFG280 User Manual 5 The 1 and 0.1 LEDs provide accurate indication for the two lowest frequency ranges. For example, if the FREQUENCY dial is set on 2.6 and the 1 LED is lighted, the function generator output frequency is 2.6 Hz. 5. FREQUENCY Range LEDs. Indicate the range (either MHz or kHz) of the reading shown on the counter rea[...]

  • Page 16

    Getting Started 6 CFG280 User Manual T able 1 : Eff e ct of Symm e t r y Buttons on Output W ave fo r m L e ft Symm e t r y Button Ri ght Symm e t r y Button 10. SWEEP Button. Activates the internal sweep generator , which produces a signal that traverses a range of frequencies. This button enables the SWEEP RA TE and SWEEP WIDTH knobs. Y ou can al[...]

  • Page 17

    Getting Started CFG280 User Manual 7 14. SOURCE Button. Selects between internal and external counter input. When you push the button in, the counter readout displays the signal frequency count from the EXT COUNTER INPUT . When you push the button out the counter readout displays the frequency count of the signal being generated by the CFG280 Funct[...]

  • Page 18

    Getting Started 8 CFG280 User Manual Rear Panel In addition to the line voltage switches, fuse, and power cord receptacle, the items shown in Figure 3 are located on the rear panel. 1 3 2 Figure 3: Rear Panel Connections CAUTION. T o avoid the risk of fir e or damage to theCFG280 Function Generator , be sur e input equipment is pr operly gr ounded [...]

  • Page 19

    CFG280 User Manual 9 Reference This section describes several advanced functions of the CFG280 Function Generator . The variety of swept and modulated signals available from the function generator make it especially useful for such applications as testing servo-system or amplifier response, distortion, and stability . It can be used for FM generati[...]

  • Page 20

    Reference 10 CFG280 User Manual 3. Change the FREQUENCY range and rotate the FREQUENCY dial. Observe how the frequency of the TTL signal changes. 4. Rotate the DC OFFSET knob. Notice that this knob has no effect on TTL signals. The DC OFFSET knob has no effect because the DC of fset of a TTL signal is standardized for compliance with TTL logic. Sig[...]

  • Page 21

    Reference CFG280 User Manual 11 3. Connect another channel of the oscilloscope to the device under test (see Figure 5). 4. Push the SWEEP button out on the function generator to deactivate the internal sweep function. 5. T urn the FREQUENCY dial to the desired sweep start frequency (the lowest point on the sweep). 6. Push the SWEEP button in to ena[...]

  • Page 22

    Reference 12 CFG280 User Manual 2. T urn the Frequency Dial to the 0.1 position. CAUTION. T o avoid damage to the CFG280, ensur e that the maximum voltage into the r ear panel VCF INPUT is no mor e than ± 10 V pk. 3. Connect an external voltage signal to the VCF INPUT on the rear panel of the instrument (see Figure 6). 4. Push the SWEEP button out[...]

  • Page 23

    Reference CFG280 User Manual 13 2. Push the sine wave FUNCTION button. 3. Set the FREQUENCY dial to the desired carrier frequency . CAUTION. T o avoid damage to theCFG280 Function Generator , ensur e that the maximum voltage into the r ear panel VCF INPUT is no mor e than 5 V p-p . 4. Connect an external voltage signal to the EXT AM INPUT on the re[...]

  • Page 24

    Reference 14 CFG280 User Manual T est oscilloscope Ramp Generator CFG280 MAIN OUT CFG253 T o GA TE INPUT (on rear panel) T o VCF INPUT (on rear panel) EXT IN RAMP OUT Figure 8: T one-Burst and Stepped Frequency Multiplication T est Setup 3. Connect the MAIN OUTPUT of the CFG253 to a BNC T connector . Connect the BNC T outputs to the GA TE INPUT con[...]

  • Page 25

    Reference CFG280 User Manual 15 T one-Burst or stepped frequency output GA TE input VCF input Figure 9: T one-Burst and Stepped Frequency T ypical Waveforms 7. Select the sweep frequency range by adjusting the FREQUENCY dial to one end of the swept range (upper or lower limit, depending on the polarity of the ramp) and adjusting the other end with [...]

  • Page 26

    Reference 16 CFG280 User Manual[...]

  • Page 27

    CFG280 User Manual 17 Appendix A: Specifications T ables 2 through 5 show characteristics of the CFG280 Function Generator that are guaranteed by warranty . T able 2: Generator Specifications Characteristic Measurement Outputs Square wave, sine wave, triangle wave, TTL pulse, positive and negative ramp, pulse and skewed sine wave, AM, and sweep fun[...]

  • Page 28

    Appendix A: Specifications 18 CFG280 User Manual T able 2: Generator Specifications (Cont.) Characteristic Measurement Am p lit ud e Flat n ess (At 10 kHz, 50  Load) Withi n ± 0 . 5 d B , 0 .1 H z to 11 0 k H z Within ± 1.5 dB, to 1.1 MHz Within ± 2.5 dB, to 1 1 MHz Sine W ave Distortion <1% from 10 Hz to 100 kHz –30 dB at all other freq[...]

  • Page 29

    Appendix A: Specifications CFG280 User Manual 19 T able 3: Counter Specifications Characteristic Measurement I npu t Sele c tio n I n te rn al a nd e x te rn al i npu t sele c ta b le F r e qu e ncy Ra n ge DC to 1 00 MH z f o r i n te rn al 1 Hz to 100 MHz, AC coupled for external Resol u tio n F r e qu e ncy mo d e: 1 H z, 1 0 H z, 1 k H z Period[...]

  • Page 30

    Appendix A: Specifications 20 CFG280 User Manual T able 4: General Specifications Characteristic Measurement Line V oltage Range Selectable ranges at 50 Hz to 60 Hz 90 V AC to 1 10 V AC 108 V AC to 132 V AC 198 V AC to 242 V AC 216 V AC to 250 V AC Operating T emperature +0 _  C to +40 _  C, 80% relative humidity Nonoperating T emperature –[...]

  • Page 31

    Appendix A: Specifications CFG280 User Manual 21 T able 6: T ypical Mechanical Specifications Characteristic Measurement Dimensions (H x W x D) 100 mm X 240 mm X 230 mm (3.9 in x 9.5 in x 9.0 in) Weight 3.0 kg (6.6 lb)[...]

  • Page 32

    Appendix A: Specifications 22 CFG280 User Manual[...]

  • Page 33

    CFG280 User Manual 23 Appendix B: Maintenance This appendix provides information for the basic maintenance of the CFG280 Function Generator . Cleaning T o clean the CFG280 Function Generator , use a soft cloth dampened in a solution of mild detergent and water . Do not spray cleaner directly onto the instrument, since it may leak into the cabinet a[...]

  • Page 34

    Appendix B: Maintenance 24 CFG280 User Manual T roubleshooting Use the following diagrams to identify basic problems with your instrument setup. The diagrams do not provide instructions for or recommend instrument disassembly . If these diagrams fail to solve your problem, send your instrument to the nearest T ektronix service center . NOTE . These[...]

  • Page 35

    Appendix B: Maintenance CFG280 User Manual 25 T oggle the SOURCE button. Inappropriate Counter Reading Start. Is the digital display frozen? Are function, gate, and attenuation settings appropriate for the input signal? Send your instrument to the nearest T ektronix service center . Change settings to accommodate the input signal. Are you using the[...]

  • Page 36

    Appendix B: Maintenance 26 CFG280 User Manual Push appropriate MUL TIPLIER and FUNCTION buttons. Go to Digital Display Blank on page 24. Adjust with AMPLITUDE knob and MAIN button. Does oscilloscope have good connection to output jack? Ye s Ye s Are amplitude settings too low to produce visible signal? No No Are range and function selected? No Ye s[...]

  • Page 37

    Appendix B: Maintenance CFG280 User Manual 27 Ye s Send your instrument to the nearest T ektronix service center . Adjust with AMPLITUDE knob and MAIN button. Is signal amplitude too large or too small? Ye s No No Ye s Start. Is signal frequency too fast or slow? Adjust with MUL TIPLIER buttons and FREQUENCY dial. Is signal responsive to sweep rate[...]

  • Page 38

    Appendix B: Maintenance 28 CFG280 User Manual[...]

  • Page 39

    CFG280 User Manual 29 Appendix C: Replaceable Parts Replaceable parts may be ordered directly from your authorized T ektronix dealer . Standard Accessories The following items are shipped with the CFG280 Function Generator: T able 7: Standard Accessories Accessory T ektronix Part Number Fuse, 3AG, 0.6 A, 250 V , SB (90 – 132 V operation) 159–00[...]

  • Page 40

    Appendix C: Replaceable Parts 30 CFG280 User Manual The following power cords are available. T able 9: Accessory Power Cords Plug Configuration Normal Usage T ektronix Part Number North America 1 15 V 161-0104-00 Europe 230 V 161-0104-06 United Kingdom 230 V 161-0104-07 Australia 230 V 161-0104-05 North America 230 V 161-0104-08 Switzerland 230 V 1[...]