Tektronix 2440 digital oscilloscope

Tektronix 2440 digital oscilloscope

Document Overview

This document is a quick reference guide for the Tektronix 2440 digital oscilloscope, first printed in 1987. Its core positioning is a "practical operation manual" - it does not replace the complete "2440 Operation Manual" (070-6695-00), but focuses on step-by-step operation and menu logic analysis of the instrument's core functions. The document structure is centered around the "front control panel buttons" and follows the process of "basic power on → functional modules → data output". It covers 19 key functional chapters, including 19 hardware schematics and menu screenshots, clarifying the hierarchical menu relationship, parameter adjustment range, and typical application scenarios of each button. It is suitable for engineers who have already understood the basic principles of oscilloscopes and need to quickly get started, especially focusing on practical guidance for characteristic functions such as dual trigger systems, multi-mode acquisition, GPIB communication, etc.

Core parameters and hardware layout of the instrument

2.1 Core Technical Parameters

Detailed Explanation of Key System Parameters

Vertical system channel configuration with 2 analog channels (CH1/CH2), supporting ADD/MULT/XY combination mode

Sensitivity range 2mV/div -5V/div (equivalent to 20mV/div -50V/div after 10X probe adaptation)

Coupling method AC/DC/GND, AC coupling and 50 Ω terminal mutually exclusive

The bandwidth limit is adjustable in three levels: 20MHz/100MHz/FULL, and can be extended to 300MHz in Repet mode (only repeating waveforms)

Horizontal system time base range A/B dual time base, 5ns/div -100ms/div, ≤ 100ms/div automatically switches to ROLL mode

Trigger positions 1/8, 1/4, 1/2, 3/4, 7/8, a total of 5 preset positions, supporting GPIB custom positions

Trigger system trigger type A/B dual trigger, supporting Edge/Video/Word/Pulse trigger (Video/Word requires optional)

Coupling method DC/AC/Noise Reject/LF Reject/HF Reject, adapted to different signal noise environments

There are a total of 5 collection modes for the collection system: Normal/Average/Explore/Repet/Save On Delta

Average frequency 2/4/8/16/32/64/128/256 times optional

The storage system has four independent reference memories (REF1-REF4), which support waveform freezing and calling

The GPIB communication interface supports Talk/Lite mode and is compatible with printer/plotter data output

2.2 Core Layout of Front Control Panel (Divided by Function)

(1) Display control area

INTENSITY knob: continuously adjusts the brightness of 4 types of screen elements (reading readout, waveform display, A INTEN area, scale texture), and defaults to controlling the last selected element;

SELECT button: Switch brightness adjustment object (read out) ↔ display）；

STATUS/HELP button: Press once to display the "Instrument Status Menu" (including trigger status, acquisition mode, parameter configuration), press again to enter HELP mode (operate any button to display the corresponding function description).

(2) Quick operation area

AUTO SETUP button: One click optimization of vertical/horizontal/trigger parameters to ensure stable signal display (default activation of CH1, no switching for selected channels);

PRGM button: Enter the "AutoStep Sequencer" menu, support storing/calling 50-200 panel settings, and can name 40 test processes;

MEASURE button: activates waveform parameter extraction function, supports continuous measurement or single snapshot;

OUTPUT button: Configure GPIB communication parameters, control data transmission/printing/drawing.

(3) Vertical control zone

CH1/CH2 independent control:

POSITION knob: adjust the vertical position of the channel waveform;

VARIABLE button: Unlock non calibration adjustment (CH1 affects ADD mode reading, CH2 does not affect);

VOLTS/DIV knob: adjusts sensitivity (2mV-5V/div), automatically adapts to 1X/10X/100X/1000X Tek encoding probes;

COUPLING/INVERT button: switch coupling mode, reverse waveform polarity;

BANDWIDTH button: Select the bandwidth limit gear.

MODE button: Switch vertical mode (CH1/CH2/ADD/MULT/YT: XY), ADD and MULT are mutually exclusive. In XY mode, CH1 is the X-axis and CH2 is the Y-axis.

(4) Horizontal control zone

A/B button: Switch between A/B time base mode (A is the regular time base, B is the delayed scan);

A INTEN button: Activate A enhancement mode, SEC/DIV knob switches to control B time base;

A AND B SEC/DIV knob: adjust the time base (5ns-100ms/div);

POSITION knob: Adjust the horizontal position of the waveform and control the CH1 (X-axis) position in XY mode.

(5) Trigger and Delay Control Zone

A/B TRIG button: Switch A/B trigger menu, share trigger slope, mode, source selection and other controls;

TRIGGER LEVEL knob: adjust trigger level;

Initiat @ 50% button: automatically sets the trigger level to 50% of the signal peak to peak value;

DELAY area: EVENT and TIME buttons, CURSOR/DELAY knobs (adjust delay parameters or cursor position).

(6) Collection and Storage Control Area

ACQUIRE button: start/restart acquisition, switch acquisition mode;

SAVE button: Freeze waveform, enter storage menu;