Tektronix SD-14 User Manual
Tektronix SD-14 User Manual

Tektronix SD-14 User Manual

Sampling head
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Summary of Contents for Tektronix SD-14

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 User Manual SD-14 Sampling Head 070–8286–01 This document applies for firmware version X.XX and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so.
  • Page 3 Instrument Serial Numbers Each instrument manufactured by Tektronix has a serial number on a panel insert or tag, or stamped on the chassis. The first letter in the serial number designates the country of manufacture. The last five digits of the serial number are assigned sequentially and are unique to each instrument.
  • Page 4 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located.
  • Page 6: Table Of Contents

    Contents List of Figures ..........List of Tables .
  • Page 7 Contents Contents...
  • Page 8: List Of Figures

    List of Figures Figure 1: Block Diagram of the Sampling Head ....Figure 2: Sampling Head Compartments in an 11801B and a CSA 803A .
  • Page 9 List of Figures Contents...
  • Page 10: List Of Tables

    List of Tables Table 1: Mainframe Executive Processor and Time Base/Controller Firmware Versions Compatible with the SD 14 ....Table 2: Acquisition Electrical Specifications ....Table 3: Environmental and Mechanical Specifications .
  • Page 11 List of Tables Contents...
  • Page 12: Introduction

    Introduction The SD 14 Sampling Head is a high performance, probe equipped sampling head that can be installed in the 11800 Series Digital Sampling Oscillo scopes, the SM 11 Multi Channel Unit, and the CSA 803 Series Communica tions Signal Analyzers. NOTE Be sure the firmware in your mainframe instrument is compatible with the SD 14.
  • Page 13: Figure 1: Block Diagram Of The Sampling Head

    Introduction Acquisition System Strobe Drive Strobe CH 1 Strobe Sense Generator To/from Instrument Delay Adjustment Acquisition System CH 2 Figure 1: Block Diagram of the Sampling Head The strobe sense signal is a part of the strobe signal returned to the instru ment.
  • Page 14: Safety

    Safety Terms in Manuals CAUTION statements identify conditions or practices that could result in damage to the equipment or other property. WARNING statements identify conditions or practices that could result in personal injury or loss of life. Terms on Equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking, or a hazard to property including the equipment itself.
  • Page 15 Safety Do Not Operate in Explosive Atmospheres The sampling head provides no explosion protection from static discharges or arcing components. Do not operate the instrument in an atmosphere of explosive gases. SD 14 User Manual...
  • Page 16: Electrostatic Discharge

    Electrostatic Discharge To prevent electrostatic damage to the instrument and sampling probes, follow the precautions described in this manual and the manuals accompa nying your sampling head and mainframe instrument. Acquisition circuitry in the sampling probes is susceptible to damage from electrostatic discharge and from overdrive signals and DC voltages.
  • Page 17 Electrostatic Discharge SD 14 User Manual...
  • Page 18: Probe And Probe Cable Care

    Probe and Probe Cable Care The sampling head is permanently equipped with two sampling probes, one for each channel, attached to cables. These are high precision assemblies with an integrated circuit sampler mounted on a small hybrid microcircuit. The assembly is designed for normal lab use in a remote probing environ ment where conditions may be less than the optimum normally expected for a microelectronics environment.
  • Page 19 Probe and Probe Cable Care SD 14 User Manual...
  • Page 20: Installing The Sampling Head

    Installing the Sampling Head The sampling head fits into the front panel of a compatible instrument, such as the 11800 Series Digital Sampling Oscilloscope or the CSA 803 Series Communications Signal Analyzer. Figure 2 shows the front panel of an 11801B Digital Sampling Oscilloscope and a CSA 803A Communications Signal Analyzer and the locations of the sampling head compartments.
  • Page 21 Firmware Version for SD 14 Operation w10.00 11801, 11802 w3.00 11801A, CSA 803 w4.00 11801B, CSA 803A If your mainframe's firmware does not satisfy the requirements listed in Table 1, contact your Tektronix sales representative for upgrade information. SD 14 User Manual...
  • Page 22: Figure 3: The Identify Pop Up Menu

    Installing the Sampling Head Figure 3: The Identify Pop Up Menu At least one sampling head must be installed in an 11800 Series or a CSA 803 Series instrument to sample signals. CAUTION To prevent damage to either the instrument or the sampling head, never install or remove a sampling head when the instrument is powered on.
  • Page 23: Figure 4: Installing A Sampling Head In An Instrument

    Installing the Sampling Head Mainframe Lock Down Screw Sampling Head Figure 4: Installing a Sampling Head in an Instrument SD 14 User Manual...
  • Page 24: Using The Sampling Head

    Using the Sampling Head Figure 5 shows the front panel of the sampling head and identifies the buttons, lights, and probes. CAUTION To prevent damage to the sampling head, do not apply a voltage outside the range "15 V and always follow electrostatic discharge precautions.
  • Page 25: Connecting Signals

    Using the Sampling Head Connecting Signals The probes for each channel let you directly connect to the circuitry under test, many times without attaching any extra hardware to the circuitry itself. The SD 14 also has the following standard 4 mm accessories to facilitate probe attachment (see Figure 6): Wire form ground attachment Four post ECB mount ground socket...
  • Page 26: Figure 7: Attaching And Removing The Wire Form Ground

    Using the Sampling Head Wire Form Ground Attachment Probe Tip Figure 7: Attaching and Removing the Wire Form Ground Attachment Four Post Mount Ground Socket ECB Mounting Pattern Signal .200" Square D55RD37 (.037" plated hole) Figure 8: Use of the Four Post ECB Mount Ground Socket and ECB Pattern Figure 8 shows the ECB pattern for the four post ECB mount ground socket.
  • Page 27: Buttons And Lights

    Using the Sampling Head Ground Pad Figure 9: Use of the Edge Tab ECB Quick Mount Ground Socket Buttons and Lights Each channel has a SELECT CHANNEL button and a yellow channel light. The channel light can have three states: off, on steady, or blinking. The operation of the channel button depends on the state: If the yellow light is off, then the channel is not acquiring trace data, and no trace is displayed from that channel.
  • Page 28: Instrument/Sampling Head Interaction

    Using the Sampling Head Instrument/Sampling The sampling head is a part of a larger system. Most of the sampling head functions are controlled automatically from the instrument. These functions Head Interaction include vertical scaling and horizontal sampling rate. You do not directly control these parameters;...
  • Page 29: Programming Interface Commands

    Using the Sampling Head Programming Interface Commands Commands from a remote computer to the mainframe instrument (via the GPIB or RS 232 C Interface) can control the Channel D Delay and External Channel Attenuation functions of the SD 14. For these commands, <alpha> indicates the sampling head location (M for mainframe or A, B, C, or D for an SM 11 Multi Channel unit;...
  • Page 30: Slew Rate Limitation

    Using the Sampling Head Figure 11: Calibrator Signal after Pressing Autoset (Edge Mode), Averaging On Slew Rate Limitation For high voltage or high frequency signals, the slew rate of the displayed signal may be limited. Refer to Specifications on page 27. For detailed information about acquiring, displaying, and measuring traces, see the User Manual for your instrument.
  • Page 31 Using the Sampling Head SD 14 User Manual...
  • Page 32: Adjusting Parameters

    Adjusting Parameters The SD 14 Sampling Head is capable of performing over a wide range of conditions with only periodic calibration. However, you can use the controls of the mainframe instrument to optimize two parameters on the sampling head: Offset null Offset gain To get the best accuracy form the SD 14 Sampling Head, you may want to adjust sampling head parameters whenever you have moved the sampling...
  • Page 33: Stored Parameters

    Adjusting Parameters Stored Parameters The sampling head contains nonvolatile memory that stores two values, the factory default value and the user constant, for each of the offset null and offset gain parameters. These values always remain in the sampling head, even if you remove the sampling head from the instrument.
  • Page 34: Offset Null And Offset Gain

    Adjusting Parameters Offset Null and Offset The offset null adjustment removes unwanted DC offset that may be present in the sampling probe. This adjustment effectively zeroes the offset circuitry Gain in the sampling probe so that a 0 V input signal delivers a 0 V output. The offset gain adjustment matches the requested offset from the user to the sensitivity of the probe offset circuit.
  • Page 35 Adjusting Parameters SD 14 User Manual...
  • Page 36: Accessories

    131-5308-XX Edge tab ECB quick mount ground sockets, Tektronix part number 131-5309-XX To obtain replacements, refer to a Tektronix products catalog or contact your local Tektronix field representative. Optional Accessories The following optional accessories may be purchased for use with the SD 14.
  • Page 37 Accessories SD 14 User Manual...
  • Page 38: Specifications

    Specifications Table 2: Acquisition Electrical Specifications Characteristics Specifications Small Signal Rise Time 140 ps or less, 10% to 90% Small Signal Aberrations distal to 1.5 ns +12% to -25% typical 1.5 ns to 4 ns +1% to -3% typical 4 ns to 30 ns "2% typical after 30 ns "1% typical...
  • Page 39: Figure 13: Slew Rate Limitation

    Specifications Vp p X fGHz = 4 Volts fGHZ Frequency Figure 13: Slew Rate Limitation SD 14 User Manual...
  • Page 40 Specifications Table 3: Environmental and Mechanical Specifications Characteristics Specifications Weight 271 grams (9.6 oz) Height 71.05 mm (2.9 in) Width 23.28 mm (0.95 in) Depth 91.39 mm (3.8 in) Probe Length 1 m (39.4 in) Ambient Temperature Operating 0_ C to 50_ C (32_ F to 122_ F) Non operating -40_ C to 75_ C (-40_ F to 167_ F) Altitude...
  • Page 41 Specifications SD 14 User Manual...
  • Page 42: Glossary

    Glossary Autoset A means of letting the instrument mainframe set itself to provide a stable and meaningful display of a given trace. Channel A place to connect a signal or attach a network or transmission line to sampling heads. Also, the smallest component of a trace expression. Channel Number The number assigned to a specific signal input connector.
  • Page 43 Glossary SD 14 User Manual...
  • Page 44: Index

    Index Electrostatic discharge, precautions, 5 Probes, care, 7 Enhanced Accuracy, 21 Extender cable, 7, 25 Accessories, 25 26 cable marker set, 25 edge tab ECB quick mount ground socket, 14, 25 extender cable, 7, 25 Removing, 11 four post ECB mount ground sock Rise time, acquisition, 1 et, 14, 25 optional, 25 26...
  • Page 45 Index Index...

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