Tektronix TDS 784D User Manual

Triggering on Waveforms
TDS 500D, TDS 600B, & TDS 700D User Manual
3–113
Communications Triggering
The TDS Oscilloscope can trigger on communication signals (option 2C only).
Table 3–9 lists the available standards, codes, and bit rates. This section
describes how to use Comm triggering — how to select the Source, Code, bit
rate, telecom Standard, Pulse Form, Level or Threshold, and Mode and Holdoff.
NOTE. To function properly, Comm triggers force some oscilloscope modes and
settings to new values. Also, selecting a mask from the MEASURE menu selects
the Comm trigger settings for that mask. However, selecting a Comm trigger
does not select a mask.
Table 3–9: Comm triggers
Standard Name Code
1
Bit Rate
OC1/STM0 NRZ 51.84 Mb/s
OC3/STM1 NRZ 155.52 Mb/s
OC12/STM4 NRZ 622.08 Mb/s
DS0 Sgl Masks
2
64 kb/s
DS0 Dbl Masks
2
64 kb/s
DS0 Data Contra Masks
2
64 kb/s
DS0 Timing Masks
2
64 kb/s
E1 AMI 2.048 Mb/s
E2 AMI 8.44 Mb/s
E3 AMI 34.368 Mb/s
E4 CMI 139.26 Mb/s
E5 (CEPT) NRZ 565 Mb/s
STM1E CMI 155.52 Mb/s

Tektronix TDS 784D Specifications

General

Bandwidth	1 GHz
Channels	4
Sample Rate	4 GS/s
Vertical Sensitivity	1 mV/div to 10 V/div
Vertical Resolution	8 bits
Input Coupling	AC, DC, GND
Input Impedance	1 MΩ ± 1%
Display	color LCD
Timebase Accuracy	50 ppm
Trigger Modes	Edge, Pulse, Video
Power Requirements	100-240 VAC
Dimensions	508 mm

Summary

WARRANTY

General Safety Summary

To Avoid Fire or Personal Injury

Safety precautions to avoid injury and damage to the product and connected equipment.

Electrostatic Discharge

Precautions to prevent damage from electrostatic discharge to circuitry.

Getting Started

Product Description

Start Up

Ensures oscilloscope is properly installed and powered on before use.

Reference

Acquiring and Displaying Waveforms

How to acquire, select, and display waveforms properly for measurement.

Triggering on Waveforms

Explains how to trigger for a stable display, covering basic principles and types.

Measuring Waveforms

Details how to use the oscilloscope's five classes of measurements for accurate results.

Saving Waveforms and Setups

How to save and recall waveforms, setups, and displays, and manage files.

Communicating with Remote Instruments

How to prepare and set up the oscilloscope for control and operation over the GPIB interface.

Determining Status and Accessing Help

How to display status of internal systems and access on-line help.

Using Features for Advanced Applications

Explains powerful features for testing and digitally processing acquired waveforms.

Appendix B: Algorithms

Measurement Variables

MCross Calculations

Measurement Algorithms

Defines and calculates automated measurements such as Amplitude, Area, and Cycle Area.

Fall Time

Integration Algorithm

Explains the algorithm used by the oscilloscope for integrating waveforms.

Measurements on Envelope Waveforms

Appendix C: Packaging for Shipment

Appendix D: Probe Selection

Passive Voltage Probes

General Purpose (High Input Resistance) Probes

Low Impedance (ZO) Probes

High Voltage Probes

Active Voltage Probes

Probes using active circuit elements like transistors, requiring a power source.

Current Probes

Enable direct observation and measurement of current waveforms from DC to 1 GHz.

Optical Probes

Blend optical power meter functions with high-speed analog waveform analysis.

Appendix E: Inspection and Cleaning

Inspection and Cleaning Procedures

Glossary

Acquisition

Aliasing

Equivalent-time sampling (ET)

Interpolation

Trigger Holdoff, trigger

Setup/Hold trigger

Triggers when data source changes state within setup or hold time relative to a clock source.