# Tektronix TDS 430A 400 MHz 2-Channel Digitizing Oscilloscope (Pre-Owned)

# Tektronix TDS 430A 400 MHz 2-Channel Digitizing Oscilloscope (Pre-Owned)

## Key Features At A Glance

-   Bandwidth from 200 MHz to 400 MHz across the series, with a 100 MS/s sample rate on all channels
-   Available in 2- and 4-channel models for simple to complex applications
-   ±1.5% DC gain accuracy with 8-bit vertical resolution (256 levels)
-   30,000-point record length standard; 120,000 points with Option XL
-   25 built-in automatic measurements; extended Waveform Math and FFT optional
-   Standard video trigger for NTSC, PAL, SECAM and custom video signals
-   10 ns Peak Detect mode captures high-frequency and random glitches
-   GPIB (IEEE 488.2) standard for programmable control and automated test systems

The Tektronix TDS 400A Personal Lab Oscilloscopes are highly featured, portable, and easy-to-use digitizing instruments built for professionals who demand high precision and fidelity from their measurements. The series comprises the TDS 420A, TDS 430A, and TDS 460A — a choice of 2- and 4-channel models ranging from 200 MHz to 400 MHz, with a 100 MS/s sample rate on all channels, combining a broad feature set with affordable pricing.

These scopes are suited to a wide range of simple to complex applications. Listed intended uses include biophysical and biomedical research, electrophysical and electromechanical system design, audio system measurement and analysis, manufacturing test and quality control, power supply and power-related design, and product service and maintenance. With standard video trigger capability, the instruments are also well suited to measuring video signals, including NTSC, PAL, and SECAM.

ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive, Elgin, Illinois. Every pre-owned unit is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received — so whichever condition you choose, the instrument comes from a source that handles the equipment directly rather than passing an order along.

## Compare Other Models in This Series

The TDS 400A Personal Lab series brings together a choice of 2- and 4-channel digitizing oscilloscopes spanning 200 MHz to 400 MHz, all sharing a 100 MS/s sample rate on every channel. Across the family, Tektronix pairs excellent performance with a broad standard feature set — the TDS Graphical User Interface, standard video trigger, 25 automatic measurements, and floppy-disk storage — at affordable prices.

All three models — the TDS 420A, TDS 430A, and TDS 460A — share the same acquisition architecture, display, and interface, differing mainly in bandwidth and channel count. This lets you select the precise combination of bandwidth and channels your application requires without changing the operating experience from one model to the next.

Each model below is its own dedicated product page with condition-matched pricing. Selecting a specific model takes you to its pre-owned listing, where price and availability reflect that exact configuration and condition.

The TDS 460A is the four-channel, 400 MHz member of the series — the configuration featured on the front of the family literature. It combines the family's full 400 MHz bandwidth with four input channels, making it the most fully specified model in the lineup for multi-channel work at the top of the series' bandwidth range.

The three models differ along two axes: bandwidth and channel count. The TDS 420A is a four-channel, 200 MHz instrument; the TDS 430A is a two-channel, 400 MHz instrument; and the TDS 460A is a four-channel, 400 MHz instrument. The comparison table below sets these differences out side by side.

Every model carries the 100 MS/s sample rate on all channels, 30,000-point standard record length (120,000 with Option XL), the standard video trigger, and GPIB programmability, so the choice between them comes down to whether your work needs 200 MHz or 400 MHz of bandwidth and two or four channels.

Model

Bandwidth

Channels

Sample Rate

**TDS 430A**

400 MHz

2

100 MS/s

TDS 420A

200 MHz

4

100 MS/s

TDS 460A

400 MHz

4

100 MS/s

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

## Accessories Supplied

-   1 Probe Per Channel (P6138A 10X Passive Probes)
-   Video Trigger
-   Reference Manual (070-8035-03)
-   User Manual (070-8034-03)
-   Performance Verification Document (070-8721-02)
-   U.S. Power Cord (161-0230-01)

## Product Core & Specifications

Specification

Value

Signal Acquisition System

Bandwidth

400 MHz

Channels

2

Sample Rate

100 MS/s on all channels

Sensitivity

1 mV to 10 V/div (with calibrated fine adjust)

Position Range

±5 Divisions

Offset Range

±1 V from 1 to 99.5 mV; ±10 V from 100 mV to 995 mV; ±100 V from 1 to 10 V/div

DC Gain Accuracy

±1.5%

Vertical Resolution

8-Bits (256 levels over 10.24 vertical divisions)

Analog Bandwidth Selections

20 MHz, 100 MHz, and full

Input Coupling

AC, DC or GND

Input Impedance Selections

1 MΩ in parallel with 15 pF, or 50 Ω (AC and DC coupling)

Maximum Input Voltage

300 V CAT II ±400 Vpeak. Derate at 20 dB/decade above 1 MHz. 1 MΩ or GND coupled.

Channel Isolation

\>100:1 at 100 MHz for any two channels

AC Coupled Low Frequency Limit

≤10 Hz when AC 1 MΩ coupled; ≤200 kHz when AC 50 Ω coupled

Acquisition Modes

Peak Detect

High frequency and random glitch capture. Captures glitches of 10 ns using acquisition hardware at all real-time sampling rates.

Sample

Sample data only

Envelope

Max/min values acquired over one or more acquisitions, selectable from 2 to 2000, infinite

Average

Waveform averages selectable from 2 to 10,000

Hi-Res

Vertical resolution improvement and noise reduction on low-frequency signals, e.g. 12-Bits at 10 ms/div and slower

Time Base System

Time Bases

Main, Delayed

Time/Division Range

1 ns to 20 s/div

Time Base Accuracy

0.015% over any interval ≥1 ms

Record Length

500 to 30,000 sample points per channel; Opt. XL offers 120,000 points

Pre-Trigger Position

Selectable from 0 to 100% of record

Triggering System

Triggers

Main, Delayed

Main Trigger Modes

Auto, Normal, Single Sequence

Delayed Trigger

Delayed by time or events

Time Delay Range

0 ns to 20 s

Events Delay Range

2 to 10,000,000 events

External Rear Input

\>1.5 KΩ; Max input voltage is ±6 V (DC + AC peak)

Video Trigger Types

NTSC, PAL, SECAM, and Custom; TV Field, field 2 or both, Any line within a field

Line Rates

10 kHz to 64 kHz, interlaced, non-interlaced, composite

Video Trigger Sensitivity

0.6 divisions of composite SYNC will achieve a stable display

Display

Waveform Style

Dots or vectors. Infinite and variable persistence from 250 ms to 10 s

Gray Scaling

With variable persistence selected, waveform points gradually decay through 16 levels of intensity, providing 'z-axis' information about rapidly changing waveforms

Update Rate

200 ea. 500 point waveforms per sec with infinite persistence mode selected

Graticules

Full, grid, cross hair, frame

Format

YT and XY

VGA Out

Drives VGA display monitors

Measurement System

Automatic Waveform Measurements

Period, Frequency, High, Low, +Width, −Width, Maximum, Minimum, Rise, Fall, Peak to Peak, Amplitude, +Duty cycle, −Duty cycle, +Overshoot, −Overshoot, Propagation delay, Burst Width, Mean, Cycle Mean, RMS, Cycle RMS, Area, Cycle Area, Phase. Continuous update of up to four measurements on any combination of waveforms.

Thresholds

Settable in percentage or voltage

Gated

Any region of the record may be isolated for measurement using vertical bars

Snapshot

Performs all measurements on any one waveform showing results from one instant in time

Cursor Measurements

Absolute, Delta, Volts, Time, Frequency

Cursor Types

Horizontal bars (volts); Vertical bars (time); paired; operated independently or in tracking mode

Waveform Processing

Waveform Functions

Interpolate-selectable sin(x)/x or linear, Average, Envelope

Advanced Waveform Functions

FFT, Integration, Differentiation (optional)

Arithmetic Operators

Add, Subtract, Multiply, Invert

Autosetup

Single button, automatic setup on selected input signal for vertical, horizontal and trigger systems

Waveform Limit Testing

Compares incoming waveform to a reference waveform's upper and lower limits

Computer Interface

GPIB (IEEE 488.2) Programmability

Full talk/listen modes. Control of all modes, settings, and measurements.

Hardcopy/Desktop Publishing

Printer

HP ThinkJet, Epson, PostScript, Interleaf, DeskJet, LaserJet, TIFF, PCX, BMP (Microsoft Windows)

Plotter

HPGL

Interface

GPIB standard

Optional Hardcopy Interface

Centronics Type and RS-232 (option XL)

Available Printer Pack

4 in. thermal printer and storage pouch (TDS4F5P)

Storage

Waveforms

30,000 waveform points of non-volatile storage, 120,000 points optional (Option XL)

Floppy Drive

3.5 in. 1.44 MB or 720 KB DOS compatible (store waveforms, screen data, and setups)

Setups

10 front-panel setups

CRT

Type

7 in. diagonal, magnetic deflection. Horizontal raster-scan. P31 green phosphor.

Resolution

640 horizontal by 480 vertical displayed pixels

Power Requirements

Line Voltage Range

90 to 250 V RMS

Line Frequency

48 to 63 Hz

Power Consumption

240 W max

> **Important:** Maximum input voltage: 300 V CAT II, ±400 V peak; derate at 20 dB/decade above 1 MHz (1 MΩ or GND coupled).

> **Important:** International power options are required on instruments and selected accessories for operation outside the U.S. For operation outside the U.S., specify a power option A1–A5 (A1 Universal Euro 220 V/50 Hz, A2 UK 240 V/50 Hz, A3 Australian 240 V/50 Hz, A4 North American 240 V/60 Hz, A5 Switzerland 220 V/50 Hz).

> Usage tip: pair these scopes with the Tektronix ADA400A Analog Differential Amplifier (10 µV/div sensitivity) for precise low-level differential measurements, listed among the recommended accessories.

## About this Pre-Owned unit

This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.

-   Warranty included
-   Functional verification included
-   Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
-   Note that unnecessary accessories may not be included (contact Test Architect to confirm).

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

**Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.**

## Details

- **Price:** 0.0 USD - 280.0 USD
- **Vendor:** Tektronix
- **Type:** Dig Oscilloscope
- **Tags:** Digital, Manufacturers, Oscilloscopes, product_manual_group_1, Product_used, Tektronix

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| None | 0.00 USD | In stock |
| NIST Traceable | 210.00 USD | In stock |
| NIST Traceable with Full Data | 245.00 USD | In stock |
| ISO IEC 17025 Accredited | 280.00 USD | In stock |

## Images

- Tektronix TDS 430A 400 MHz 2-Channel Digitizing Oscilloscope (Pre-Owned)

---

> Source: [ValueTronics](https://valuetronics.com/products/tds430a-tektronix-digital-oscilloscope-used)
> Updated: 2026-06-03