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Tektronix DC 502 Instruction Manual
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Tektronix DC 502 Instruction Manual

Tektronix DC 502 Instruction Manual

550 mhz counter
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0 MHz
COUNTER
C 502
INSTRUCTION
MANUAL

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Summary of Contents for Tektronix DC 502

  • Page 1 0 MHz COUNTER C 502 INSTRUCTION MANUAL...
  • Page 2 WARRANTY...
  • Page 3 TABLE OF CONTENTS...
  • Page 5 10 Hz to 0 MHz or totalizes events to 10 7 at a maximum rate of 0 MHz. The DC 02 operates Measurement display is accomplished with seven-segment in a TEKTRONIX TM 00 Power Module only. LED's 7-digit readout. decimal...

  • Page 6: Operational Check

    OPERATIONAL CHECK Then turn the MEASUREMENT INTERVAL switch to the position that gives the desired reading. Generally, use the Press the RESET button to check the 7 character shorter measurement intervals for high-frequency, low- segments of each digit; the numerical display should be a resolution measurements and the longer intervals for row of eights.

  • Page 7: Using The Counter

    MEASUREMENT INTERVAL switch time by pressing the RESET button or by moving the MEASUREMENT INTERVAL switch to another position. MANUAL, apply the signal, and push the START button. The GATE indicator will light and the progressing count will be displayed. Adjust the ATTEN and TRIGGER In the MANUAL mode related LEVEL controls as necessary for a steady count.

  • Page 8: Specifications

    Input and output data access to the DC 02 is available at the rear of the main circuit board. Fig. 1-3 identifies the DC 02 be ordered with a temperature- contacts and their respective I/O assignments. A Power compensated -MHz crystal oscillator to provide a highly Module mainframe option is available which provides a stable ( parts in 10 7 ) and precise internal time base.

  • Page 9: Input Circuits

    INPUT CIRCUITS phase inversion (to correspond with the input signal) and becomes the decade input. Signals to be counted are applied via front-panel DIRECT INPUT connector J100 to the attenu ­ ators. The attenuators are frequency-compensated voltage dividers consisting of resistors R102-R107 and capacitors C102-C107.
  • Page 10 TIME BASE AND CONTROL CIRCUIT subsequent decade. Each decade is clocked with a negative ­ going transition. The DDU's are reset by a CLEAR pulse, A precise one megahertz clock provides the reference for which places a 0 count in U209 and a 9 count in each operation of the gate-generating circuits.
  • Page 11 NOR ga te U230C goes HI, producing the CLEAR and state). One microsecond later (T 7 ), a negative edge from CLEAR control signals. The next HI-to-LO transition from the 1-MHz clock toggles U222A, switching its outputs and the 1-MHz clock ( T 2 ) toggles U222A, causing its Q output placing a LO on the input of NAND gate U230D.
  • Page 12 described in the time base and control circuit. When the DS242 is an LED, and in its conduction state gives a LATCH input goes HI, the logic levels at the data inputs are front-panel OVERFLOW indication. transferred to the associated BCD bit output to be scanned by the multiplexing circuit.
  • Page 13 input of OR gate U24 B via these NAND gates, setting When the front-panel RESET button is pushed, RESET U263B to the non-blank state at the appropriate time. In goes LO, overriding the output of U263B, applying the the case where the counter overflows, the HI output from non-blank and lamp-test functions to the decoder.
  • Page 14 OVERFLOW: This output is HI when the count over ­ Data Lines: 1, 2, 4, 8 provide BCD output, serial by digit, from the currently enabled storage-register latch. flows. Other data lines include a LO when the MHz light is on, a RESET: This is a dual-function input/output line.
  • Page 15 DIAGRAMS, PARTS LISTS, AND ILLUSTRATIONS Electrical components shown on the diagrams are in the following units unless noted otherwise: Capacitors = Values one or greater are in picofarads (pF). Values less than one are in microfarads (µF). Resistors = Ohms (Ω) Logic symbology is based on MIL-STD-806B in terms of positive logic.
  • Page 16 L CTRICAL PARTS LIST Replacement parts should be ordered from the Tektronix Field Office or Representative in your area. Changes to Tektronix products give you the benefit of improved circuits and components. Please include the instrument type number and serial number with each order for parts or service.
  • Page 17 ELECTRICAL PARTS LIST (cont) CAPACITORS (cont) C192 283-0067-00 0.001 µF, Cer, 200 V, 10% C193 283-0204-00 0.01 µF, Cer, 50 V, 20% C194 283-0204-00 0.01 µF, Cer, 50 V, 20% C196 283-0167-00 0.001 µF, Cer, 200 V, 10% C199 290-0532-00 150 µF, Elect.
  • Page 18 ELECTRICAL PARTS LIST (cont) INTEGRATED CIRCUITS (cont) U241 156-0039-00 Dual 15 MHz J-K master-slave flip-flop replaceable by SN7473N U245 156-0165-00 Dual 4-input positive nor gates, replaceable, by SN7425N ONNE TORS J100 131-0955-00 Receptacle, electrical, BNC, female J180 131-0955-00 Receptacle, electrical, BNC, female INDU TORS L192 276-0569-00...
  • Page 19 ELE TRI AL PARTS LIST (cont) RESISTORS (cont) R152 315-0101-00 100 Ω, 1/4 W, 5% R153 315-0101-00 100 Ω, 1/4 W, 57. R155 315-0331-00 330 Ω, 1/4 W, 57. R158 315-0102-00 1 kΩ, 1/4 W, 5% R159 315-0102-00 1 kΩ, 1/4 W, 5% R162 315-0102-00 1 kΩ, 1/4 W, 5%...
  • Page 20 ELECTRICAL PARTS LIST (cont) RESISTORS (cont) 75 Ω , 1/4 R272 315-0750-00 75 Ω , 1/4 R273 315-0750-00 R274 315-0750-00 75 Ω, 1/4 75 Ω, 1/4 R275 315-0750-00 75 Ω, 1/4 R276 315-0750-00 R277 315-0750-00 75 Ω, 1/4 R280A 300 Ω R280B 1 kΩ...
  • Page 21 ELECTRICAL PARTS LIST (cont) INTEGRATED CIRCUITS U 1 1 156-0118-00 XB040000 Dual 100 MHz J-K master-slave flip-flop, replaceable by SN74S112N U2 1 156-0180-00 XB0 40000 Quad 2-input nand gate, replaceable by SN74S00N U135 156-0067-00 Operational amplifier, replaceable by UA741C U150 156-0182-00 Type 2-3-2 input gate, replaceable by MC10105 U160...
  • Page 22 ELE TRI AL PARTS LIST (cont) INTEGRATED IR UITS (cont) U246 Quad 2-input positive nor gate, replaceable b y 156-0043-00 SN7402N U250 156-0198-00 Quad latch, replaceable by MC4035P U251 156-0198-00 Quad latch, replaceable by MC4035P U252 156-0198-00 Quad latch, replaceable by MC4035P 156-0198-00 Quad latch, replaceable by MC4035P U253...

  • Page 23: Controls And Connectors

    CONTROLS AND CONNECTORS scale input...
  • Page 24 REV. MAY 1974...
  • Page 25 PARTS LOCATION GRID U260 U220 U230 U222 S200...
  • Page 26 Connect NOTE the DC 02 1-MHz time base reference and the secondary Tektronix, Inc. provides complete instrument repair and f the instrument is operated on the plug-in extender, standard to the oscilloscope as shown. Adjust the oscillo ­ NOTE adjustment at local Field Service Centers and at the Factory vhe +5-vo!t supply may not regulate.
  • Page 27 02 BLOCK DIAGRAM 11 \ > I ______...
  • Page 28 ---------- A ttenuators QIGO U SOB UI5OA -TIME BASE QIG2 ptional scillator Y1OI U2OI Q240 -U222A CIB2 ,0015 CRI8IB measureiaent ft ft £ ft ft • » £ ounter...
  • Page 29 U2GOB +»v U24GA U24C»B U24GC oint U2 37 U2G7A (REG) (.USA) BOARD U24 A OVERFLOW REGISTER. P/O AI MAIN BOARD ounters and isplay...
  • Page 30 M CHANICAL PARTS LIST Replacement parts should be ordered from the Tektronix Field Office or Representative in your area. Changes to Tektronix products give you the benefit of improved circuits and components. Please include the instrument type number and serial number with each order for parts or service.
  • Page 31 FIGURE 1 EXPLODED (cont) 1-19 214-1513-00 LATCH, plug-in retaining mounting hardware: (not included with latch) 213-0254-00 SCREW, thread forming, 2-56 x 0.25 inch, 100° csk, FHS 386-2292-00 SUBPANEL, front mounting hardware: (not included w/subpanel) 213-0229-00 SCREW, thread forming, 6-20 x 0.375 inch, 100° csk, FHS CIRCUIT BOARD ASSEMBLY--DISPLAY (See A2 electrical list) 337-1719-00 SHIELD, electrical, subpanel...
  • Page 32 FIGURE 1 EXPLODED (cont) 1-42 426-0724-00 FRAME SECTION, bottom 426-0725-00 FRAME SECTION, top 179-1767-00 WIRING HARNESS 105-0406-00 ACTUATOR ASSEMBLY, cam switch (S200) actuator assembly includes: 200-1391-00 COVER mounting hardware: (not included with cover) 211-0022-00 SCREW, 2-56 x 0.188 inch PHS (Discard & use ref #28) 210-0001-00 WASHER, lock, internal^ i 0.092 ID x 0.18 inch OD...
  • Page 34 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 devel ­ oped and tested. Sometimes, due to printing and shipping requirements, we can ’ t get these changes immediately into printed manuals.
  • Page 35 DC501, DC502 TEXT CORRECTION The upper limit frequency response specifications has been changed to 110 MHz. Any reference to a 100 MHz should be changed to read: 110 MHz. C5/173...
  • Page 36 DC 501 EFF SN B040000-up Page 1 of 2 DC 502 EFF SN B040000-up ELECTRICAL PARTS LIST AND SCHEMATIC CHANGES REMOVE : U167 156-0100-00 Single 40 MHz J-K edge-triggered flip-flop, replaceable by SN74H102 U169 156-0100-00 Single 40 MHz J-K edge-triggered flip-flop,...
  • Page 37 Page 2 of 2 SCHEMATIC CORRECTION DC 501 & DC 502 M20, 988/1073...
  • Page 38 DC 501 EFF SN B060000-up DC 502 EFF SN BO 70000 -up ELECTRICAL PARTS LIST AND SCHEMATIC CHANGE CHANGE TO: R137 311-1554-00 200 kΩ, Var ADD: C121 283-0111-00 0.1 µF, Cer, 50 V (R137 and C121 are located on Diagram COUNTER TIME BASE &...