Tektronix SD-22 User Manual
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Tektronix SD-22 User Manual

Sampling head
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Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
User Manual
SD-22 & SD-26
Sampling Head
070–7226–03

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Summary of Contents for Tektronix SD-22

  • Page 1 ® Advanced Test Equipment Rentals www.atecorp.com 800-404-ATEC (2832) User Manual SD-22 & SD-26 Sampling Head 070–7226–03...
  • Page 2 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 3 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 5: Table Of Contents

    Table of Contents List of Figures ..........List of Tables .
  • Page 6 Table of Contents Contents...

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

  • Page 9: List Of Tables

    List of Tables Table 1: Acquisition Electrical Specifications ....Table 2: Environmental and Mechanical Specifications ... SD 22 &...
  • Page 10 List of Tables Contents...

  • Page 11: Introduction

    Introduction The SD 22 & SD 26 Sampling Heads are high performance sampling heads that can be installed in the 11800 Series Digital Sampling Oscilloscopes, the SM 11 Multi Channel Unit, and the CSA 803 Series Communications Signal Analyzers. The SD 22 & SD 26 Sampling Heads provide the following features: Two independent channels for signal acquisition and measurements.

  • Page 12: Figure 1: Block Diagram Of The Sampling Head

    Introduction 50 W Acquisition System Strobe Drive Strobe To/from Strobe Sense Generator Instrument Acquisition System 50 W 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 13: 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 14 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 22 & SD 26 User Manual...

  • Page 15: Electrostatic Discharge

    Electrostatic Discharge To prevent electrostatic damage to the instrument and sampling heads, follow the precautions described in this manual and the manuals accompa nying your instrument. Acquisition circuitry in the sampling heads is very susceptible to damage from electrostatic discharge and from overdrive signals and DC voltages. Be sure to operate the sampling head only in a static controlled environment.
  • Page 16 Electrostatic Discharge SD 22 & SD 26 User Manual...

  • Page 17: Connector Care

    Connector Care The front of the sampling head has two precision 3.5 mm connectors, one for each channel. They are for attaching the signal cable or the device under test. These are high precision connectors with a mechanical tolerance that is closer than the tolerance in standard SMA cables.
  • Page 18 Connector Care SD 22 & SD 26 User Manual...

  • Page 19: Installing The Sampling Head

    Installing the Sampling Head The SD 22 and SD 26 Sampling Heads fit into the front panel of a compat ible instrument, such as the 11801 Series Digital Sampling Oscilloscopes or CSA 803 Series Communications Signal Analyzers. Figure 2 shows the front panels of an 11801B Digital Sampling Oscilloscope and a CSA 803A Com munications Signal Analyzer and the locations of the sampling head com partments.

  • Page 20: Figure 3: Installing A Sampling Head In An Instrument

    Installing the Sampling Head 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 the sampling head or instrument, never install or remove a sampling head when the instrument's PRINCIPAL POWER SWITCH is ON (powered on).

  • Page 21: Using The Sampling Head

    Using the Sampling Head Figure 4 shows the front panel of the sampling head and identifies the buttons, lights, and connectors. Each channel has a 3.5 mm connector for signal input/pulse output, a SELECT CHANNEL button, and a yellow channel indicator light. CAUTION Applying a voltage outside the range "3 V can result in damage to the sampling head or instrument.

  • Page 22: Connecting Signals

    Using the Sampling Head Connecting Signals The signal connectors for each channel let you connect signals that you want to sample. These are precision 3.5 mm connectors that are mechani cally compatible with the SMA standard. The input impedance is 50 W. Use extra care with the sampling head connectors.

  • Page 23: Button And Lights

    Using the Sampling Head Button 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 24: 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 25: Figure 5: The Sampling Head Fnc's Pop Up Menu

    Using the Sampling Head Figure 5: The Sampling Head Fnc's Pop Up Menu SD 22 & SD 26 User Manual...

  • Page 26: Displaying A Trace

    Using the Sampling Head Displaying a Trace The following example shows you how to acquire and display a trace with the sampling head and using an 11800 Series or CSA 803 Series instru ment. For this procedure you will need one 8 inch SMA cable. Step 1: Initialize the instrument to default settings using the Initialize selector which appears in the Utility major menu.

  • Page 27: Figure 6: The Calibrator Signal After Pressing Autoset

    Using the Sampling Head Figure 6: The Calibrator Signal after Pressing Autoset For detailed information about acquiring, displaying, and measuring traces, see the User Manual for your instrument. SD 22 & SD 26 User Manual...
  • Page 28 Using the Sampling Head SD 22 & SD 26 User Manual...

  • Page 29: Adjusting Parameters

    Adjusting Parameters To get the best performance from your sampling head, you may need to adjust sampling head parameters. These parameters affect how the sam pling head acquires signals and affect the accuracy of the resulting trace. Typically, you may want to adjust sampling head parameters whenever you have moved the sampling head to another slot or if the ambient temperature has changed "5_ C since the parameters were last adjusted.

  • Page 30: 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 above parame ters. These values always remain in the sampling head, even if you remove the sampling head from the instrument.

  • Page 31: Loop Gain

    Adjusting Parameters Loop Gain Loop gain determines the accuracy with which the sampling head accu rately follows an input voltage change that occurs between two adjacent samples. The accuracy of the sampling head output as it follows the input signal is termed the dot transient response. When loop gain is unity (1), the value of the first sample acquired after an input voltage change accurately reflects the voltage change, indicating a good dot transient response.

  • Page 32: Adjusting Loop Gain

    Adjusting Parameters Adjusting Loop Gain You can adjust loop gain automatically or manually from the Enhanced Accuracy menu. If you prefer to adjust loop gain manually, the 11800 Series and CSA 803 Series instruments also provide a divide by two feature. This feature is helpful if you are using the Calibrator signal to adjust loop gain.

  • Page 33: Offset Null

    Adjusting Parameters Offset Null The offset null adjustment removes unwanted DC offset that may be present in the sampling head. This adjustment effectively zeroes the sampling head so that an input signal with 0 V of amplitude delivers a 0 V output. If offset null is not adjusted correctly, measurements taken at the instrument will be incorrect.
  • Page 34 Adjusting Parameters SD 22 & SD 26 User Manual...

  • Page 35: Specifications

    Specifications Table 1: Acquisition Electrical Specifications Characteristics Specifications Bandwidth SD 22: 12.5 GHz typical SD 26: 20 GHz typical Sampling Repetition Rate Maximum 200 kHz Minimum 100 Hz Rise Time SD 22: 28 ps or less, 10% to 90% SD 26: 17.5 ps or less, 10% to 90% Aberrations 10 ns to 20 ps before step "3% or less, typical...
  • Page 36 Specifications Table 1: Acquisition Electrical Specifications (Cont.) Characteristics Specifications Displayed Noise SD 22 Unity Dot Response 800 mV max, 400 mV typical With Smoothing 400 mV max, 180 mV typical SD 26 (SN B020440 & above) Unity Dot Response 1.2 mV max, 750 mV typical With Smoothing...
  • Page 37 Specifications Table 2: Environmental and Mechanical Specifications Characteristics Specifications Weight 314 grams (11 oz) Height 71.05 mm (2.9 in) Width 23.28 mm (0.95 in) Depth 91.39 mm (3.8 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 38 Specifications SD 22 & SD 26 User Manual...

  • Page 39: 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 40 Glossary SD 22 & SD 26 User Manual...

  • Page 41: Index

    Index Front panel buttons, 11, 13 connectors, 12 Acquisition Remote interface, 14 lights, 11, 13 circuitry, 1 Removing, 10 rise time, 1 Rise time, acquisition, 1 ASCII interface command, 14 Input voltage, maximum, 11 Installing, 10 Sampling head parameters Bandwidth, 1 loop gain, 19, 20, 21, 22 offset null, 19, 23 stored, 20...
  • Page 42 Index Index...

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Sd-26

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