Tektronix 2445B User Manual

Operation
Word Recognizer Operation
Count functions, Delay-by-Events, and Logic Trigger functions can invoke the
available Word Recognizer (WR), if it is included in the instrument. The WR requires a
data radix, clock parameters, and a data pattern.
To change the WR display radix:
1. Press MEASURE.
2. Select MORE from the menu.
3. Select CONFIGURE from the menu.
4. Select WR-RADIX from the menu.
5. Select desired display radix from the menu by pushing the appropriate menu
(VERTICAL MODE) button.
6. Connect the WR probe to the system under test. Note that bits 0 to 7 and the
clock appear on one side of the probe and bits 8 to 15 and the qualifier appear
on the other. Be sure to connect at least one of the GND terminals to a good
signal ground in the system, as close to the signal test points as possible.
If a word is defined in one radix then displayed in another, some but not all bits of
a hexadecimal or octal digit may be X (irrelevant), rendering the digit ambiguous.
Ambiguous digits are displayed as question marks.
AI011XX XXXO ATO 17X077 AlO ??3F
BIN OCT HEX
When the WR defines the starting event or the counting event for Delay-by-
Events, the display shows both the WR status and the delay count.
7. During operation of the function driven by the WR, the WR status is displayed
in this format:
scq word
where the "s" character indicates the affected sweep (A or B); "c" is the clock
mode (T, i, or X); "q" is the qualifier bit (0, 1, or X); and "word" is a 16-bit
pattern in the selected radix.
a. Turn the A REF OR DLY POS control to the clock mode character, the
qualifier bit, or a digit of the word.
b. Turn the A control to define the underlined character. Digits of the word
can be set to 0, 1, or X with BIN radix, 0 to 7 or X with OCT, and 0 to
F or X with HEX, Note that the clocking edge can be redefined here.
2-34
2465B/2455B/2445B Operators

Tektronix 2445B Specifications

General

Brand	Tektronix
Model	2445B
Category	Test Equipment
Language	English

Summary

Instrument Serial Numbers

Serial Number Identification

Explains how serial numbers designate country of manufacture and unique instrument IDs.

Product Warranty Information

Warranty Terms and Conditions

Details Tektronix's warranty for defects in materials and workmanship.

Operator Safety Guidelines

Safety Terms and Symbols

Defines safety terms (Caution, Warning, Danger) and symbols used in the manual.

Product Handling and Power Safety

Covers safe power source, grounding, cord usage, fuses, and operational hazards.

General Product Information

Preparation for Instrument Use

Covers safety, line voltage, and fuse selection before operating the instrument.

Instrument Setup and Shipping

Details power cord connection, instrument cooling, startup, and repackaging procedures.

Oscilloscope Operation Guide

Understanding Fundamentals and Measurements

Explains basic oscilloscope operation and introduces parametric measurements.

Displaying and Configuring Signals

Guides on getting a display, auto setup, and assigning measurements to functions.

Triggering and Signal Analysis

Details horizontal controls, trigger controls, source, coupling, and slope settings for signal analysis.

Advanced Measurement Techniques

Covers cursor measurements, time interval, frequency, and phase difference analysis.

Practical Measurement Applications

Voltage and Modulation Measurements

Describes how to measure peak-to-peak, absolute voltages, and modulation indices.

Signal Analysis Techniques

Covers video signals, multi-mode signals, and algebraic addition for interference cancellation.

Timing and Frequency Measurements

Explains measurement of period, frequency, rise/fall times, and propagation delay.

Instrument Calibration and Maintenance

Initial Setup and Basic Adjustments

Covers initial setup, trace rotation, and astigmatism adjustments for optimal display.

Probe and Channel Calibration

Details auto DC balance routine, probe compensation, and channel delay matching.

Timing and Amplitude Verification

Procedures for checking timing accuracy and amplitude calibration.

Front and Rear Panel Interfaces

Power and Display Controls

Describes controls for power, display intensity, focus, and trace alignment.

Setup, Vertical, and Mode Controls

Details buttons for setup, vertical settings, and display modes (CHOP/ALT).

Horizontal and Trigger Controls

Explains horizontal sweep, trigger modes, source, coupling, and level controls.

Rear Panel Connectivity

Details rear panel connectors for gates, power, signal output, and external interfaces.

Technical Specifications

Electrical Characteristics Overview

Outlines valid electrical characteristics and adjustment guidelines.

Vertical and Horizontal System Specifications

Provides detailed bandwidth, accuracy, and response time specs for deflection systems.

Triggering Performance Specifications

Details minimum signal amplitude and jitter for stable triggering across modes.

Option-Specific Specifications

Lists electrical characteristics for DMM (Option 01), TV (Option 05), C/T/T (Option 06), WR (Option 09), and GPIB (Option 10).

Instrument Options and Accessories

Overview of Available Options

Introduces available options and their general descriptions, including rackmounting.

Standard and Optional Accessories

Lists standard accessories included with the instrument and optional items.

Extended Functions and Diagnostic Exercisers

Diagnostic Exerciser Overview

Explains diagnostic exercisers for logging, setup control, and system parameter transfer.

Operating Specific Exercisers

Details specific exercisers for power-up setup, GPIB programming, and TV system settings.

Sequence Programming Guide

Sequence Programming and Operation

Describes organizing and managing stored instrument setups into sequences.

Executing Stored Sequences

Instructions on how to recall and run sequences of stored instrument setups.

Instrument Power-Up Diagnostics

Understanding Power-Up Test Results

Explains Kernel and Confidence tests, including failure indications and codes.

Time Measurement Accuracy Charts

Delta-Time and Delta-Delay-Time Accuracy

Provides graphical data on time measurement accuracy under various conditions for C/T/T option.