# Tektronix TDS684C 1 GHz Digital Storage Oscilloscope (Pre-Owned)

# Tektronix TDS684C 1 GHz Digital Storage Oscilloscope (Pre-Owned)

## Key Features At A Glance

-   Max input: 300 V CAT II (±400 V peak) on TDS684C vs 5 VRMS on TDS694C — match the model to your signal level
-   Bandwidth from 1 GHz (TDS684C) to 3 GHz (TDS694C) across the four-channel TDS600C series
-   5 GS/s to 10 GS/s simultaneously on all four channels for full-bandwidth single-shot capture
-   RS-232, Centronics, and GPIB interfaces included standard for remote control and hardcopy output
-   Advanced triggering on glitches, slew rate, setup/hold and timeout violations, logic patterns and states
-   Waveform math with advanced DSP (FFT, integration, differentiation) and pass/fail template testing
-   29 automatic waveform measurements with measurement statistics
-   Optional Java-based application packages for jitter, disk-drive and processor-specification measurements

The Tektronix TDS600C series brings together two four-channel digital storage oscilloscopes — the TDS694C and the TDS684C — built to capture the fastest signals in today's digital designs with high fidelity and resolution. The TDS694C delivers 3 GHz of bandwidth to preserve fast rising edges and accurately show signal detail, while digitizing at 10 GS/s simultaneously on all four channels. Paired with a high-stability timebase, it makes critical timing measurements — including channel-to-channel measurements captured in a single acquisition — with high resolution and accuracy.

These oscilloscopes are aimed at the validation and characterization of high-speed digital designs: verifying simulation performance with real measurements, ensuring that desired design margins exist, making jitter measurements on high-speed data, phase-locked loops and spread-spectrum clock circuits, and capturing glitches, cross-talk and setup/hold violations. In telecommunications and data communications design they characterize rise times, overshoot and channel-to-channel timing and verify and test high-speed serial data streams. They also serve high-energy physics work for transient event capture.

ValueTronics supports every TDS600C order from our own 20,000-square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, where we stock and hold our inventory on hand. Every pre-owned unit is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received from the manufacturer.

## Brand Heritage

Tektronix, Inc. was founded in 1946 in Beaverton, Oregon, and built its name on oscilloscope technology. The company was acquired by Danaher Corporation in 2007 and became part of Fortive Corporation after Fortive was spun off from Danaher in 2016.

## Compare Other Models in This Series

The Tektronix TDS600C series consists of two four-channel color digital storage oscilloscopes, the TDS694C and the TDS684C, that share a common advanced trigger architecture, measurement system and color display while differing in bandwidth, sample rate and several vertical and timebase specifications.

Both models deliver full-bandwidth single-shot capture on all four channels simultaneously, along with the same 29 automatic measurements, waveform math and pass/fail template testing, so the choice between them comes down to the signal speed and timing resolution each application requires.

Each model in the series below is its own dedicated pre-owned product page with condition-matched pricing. Select the model and configuration whose bandwidth, sample rate and input characteristics match your measurement requirements.

The TDS694C is the higher-bandwidth member of the series, providing 3 GHz of bandwidth and 10 GS/s on every channel, a ±10 ppm timebase, approximately ±15 ps time interval measurement accuracy, 1% vertical accuracy and 100 ps peak detect. It supports cross triggering with a Tektronix TLA700 logic analyzer and an optional 120,000-point long record length, and uses the P6249 4 GHz active probe as its companion.

The principal differences follow the bandwidth tiers shown in the comparison table: the TDS694C provides 3 GHz bandwidth with 10 GS/s per channel, while the TDS684C provides 1 GHz bandwidth with 5 GS/s per channel. Record length also differs — up to 15,000 points per channel on the TDS684C versus up to 30,000 points (optionally 120,000) on the TDS694C — as do time interval measurement accuracy and timebase accuracy, which tighten to ±10 ppm on the TDS694C.

The models also differ in vertical and input flexibility: the TDS684C offers 1 mV/div to 10 V/div sensitivity, selectable 20 MHz, 250 MHz and full bandwidth limits, AC/DC/GND coupling and both 1 MΩ and 50 Ω inputs, while the TDS694C uses a 50 Ω DC-coupled input at 10 mV/div to 1 V/div with full bandwidth only. Video triggering and several passive-probe options are available on the TDS684C but not the TDS694C, whereas 100 ps peak detect and TLA cross triggering are exclusive to the TDS694C.

Model

Bandwidth

Sample Rate

Channels

**TDS684C**

1 GHz

5 GS/s

4

TDS694C

3 GHz

10 GS/s

4

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

## Accessories Supplied

-   User manual (070-0130-00)
-   User supplement (071-0273-00)
-   Quick reference guide (020-2235-00)
-   Programmer's manual in MS Help format on floppy disk (063-3120-00)
-   Technical reference manual (071-0272-00)

## Product Core & Specifications

Specification

Value

Time Base System

Time Bases

Main and delayed

Time/div Range

200 ps/div to 10 s/div

Time Base Accuracy

± 100 ppm

Time Interval Measurement Accuracy

± \[(0.2/sample rate) + (100 ppm x |reading|)\] single shot (≈50 ps @ 5 GS/s)

Record Length per Channel

500 to 15,000 pts

Trigger Jitter

8 psRMS (typical)

Pre-trigger Position

0% to 100% of record

Channel-to-channel Deskew Range

± 25 ns

Vertical System

Vertical Resolution

8-Bit (> 11-Bit with averaging)

Vertical Sensitivity

1 mV/div to 10 V/div

Floppy Disk Drive

Store reference waveforms, setups and image files on 3.5 in. 1.44 MB or 720 K Microsoft DOS-format floppy disk

Maximum Input Voltage

300 V CAT II; ± 400 V peak. Derate at 20 dB/decade above 1 MHz

DC Gain Accuracy

± 1.5%

Position Range

± 5 divs

Offset

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

Bandwidth Selections

20 MHz, 250 MHz and full

Input Impedance Selections

1 MΩ in parallel with 10 pF, or 50 Ω (AC and DC coupling)

Input Coupling

AC, DC or GND

AC Coupled Low Frequency Limit

< 10 Hz when AC, 1 MΩ coupled. < 200 kHz when AC, 50 Ω coupled

Channel Isolation

\> 100:1 at 100 MHz and > 30:1 at BW for any two channels having equal V/div settings

Acquisition Modes

Peak Detect

High frequency and random glitch capture. Captures glitches of 1 ns using acquisition hardware at all real-time sampling rates

Sample

Sample data only

Envelope

Max/min values acquired over one or more acquisitions

Average

Waveform data from 2 to 10,000 waveforms (selectable) is averaged

Single Sequence

Use RUN/STOP button to capture a single triggered acquisition at a time, which may be automatically saved to NVRAM with AutoSave

Triggering System

Edge (main and delayed)

Conventional level-driven trigger. Positive or negative slope on any channel or rear panel auxiliary input. Coupling selections: DC, AC, noise reject, HF reject, LF reject

Logic – Pattern

Specifies a logical combination (AND, OR, NAND, NOR) of the four input channels (high, low, don't care). Trigger when pattern stays true or false for a specified time

Logic – State

Any logical pattern of channels 1, 2 and 3 plus a clock edge on channel 4. Triggerable on rising or falling clock edge

Logic – Setup/Hold

Trigger on violations of both setup time and hold time between clock and data which are on two input channels

Pulse – Glitch

Trigger on or reject glitches of positive, negative or either polarity. Minimum glitch width is 1.0 ns with 200 ps resolution

Pulse – Runt

Trigger on a pulse that crosses one threshold but fails to cross a second threshold before crossing the first again

Pulse – Width

Trigger on width of positive or negative pulse either within or out of selectable time limits (1 ns to 1 s)

Pulse – Slew Rate

Trigger on pulse edge rates that are either faster or slower than a set rate. Edges can be rising, falling or either

Pulse – Timeout

Trigger on an event which remains high, low or either, for a specified time period, selectable from 1 ns to 1 s, with 200 ps resolution

Video (optional)

Trigger on a particular line of individual, odd/even or all fields. Trigger on a specific pixel of a line by using the video trigger with delay by events. Choose positive or negative horizontal sync polarity. 525/NTSC: monochrome or color (studio-quality NTSC) sync formats. 625/PAL: color or monochrome (studio-quality PAL) sync formats. HDTV: 1125/60, 1050/60, 1250/50 and 787.5/60 HDTV formats

Trigger Bandwidth (edge type)

1 GHz

Main Trigger Modes

Auto, normal, single

Delayed Trigger

Delay by time, events, or events and time

Delay by Time Range

16 ns to 250 s

Delay by Events Range

2 to 9,999,999 events

External Trigger Input

Input impedance: ≥1.5 kΩ; max. input voltage: ± 20 V (DC + peak AC)

Display Characteristics

Waveform Style

Dots, vectors, variable persistence from 32 ms to 10 s, infinite persistence and intensified samples

Color

Standard palettes and user-definable color for waveforms, text, graticules and cursors. Measurement text and cursor colors matched to waveform. Waveform collision areas highlighted with different color. Statistical waveform distribution shown with color grading through variable persistence

Color Grading

With variable persistence selected, historical timing information is represented by temporal or spectral color scheme

Graticules

Full, grid, cross-hair, frame and NTSC and PAL (with video trigger option)

Format

YT and XY

Resolution

640 horizontal by 480 vertical displayed pixels (VGA)

Color CRT Monitor

7 in. diagonal NuColor liquid crystal full-color shutter, 256 levels

Measurement System

Automatic Waveform Measurements

Period, frequency, +width, –width, rise time, fall time, +duty cycle, –duty cycle, delay, phase, burst width, high, low, max, min, peak to peak, amplitude, +overshoot, –overshoot, mean, cycle mean, RMS, cycle RMS, area, cycle area, extinction ratio (ratio, dB, %) and mean optical power. Continuous update of up to four measurements on any combination of waveforms

Measurement Statistics

Display minimum and maximum or mean and standard deviation on any displayed single-waveform measurements

Thresholds

Settable in percentage or voltage

Gating

Any region of the waveform 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, and NTSC IRE and line number (with video trigger option)

Cursor Types

Horizontal bars (volts), vertical bars (time); operated independently or in tracking mode

Histogram Measurements

Mean, median, standard deviation, hits, waveform count, peak hits, peak-to-peak, % mean ± 1, 2 and 3 standard deviations

> **Important:** Maximum input voltage: 300 V CAT II (±400 V peak), derated at 20 dB/decade above 1 MHz; the TDS694C is limited to 5 VRMS.

> **Important:** Measurement probes are not included in the standard configuration (which supplies only manuals, power cord, front cover, deskew fixture, footswitch and accessory pouch). The TDS694C's companion probe is the P6249 4 GHz Active Probe; recommended accessories include the P6249 4 GHz Active Probe, P6248 1.7 GHz Differential Probe, P6330 3.5 GHz Differential Probe and SureFoot surface mount device interconnects.

> **Important:** The maximum record length of 120,000 points/channel applies only to the TDS694C with the long record length option (Opt. 1M); the TDS684C maximum is 15,000 points/channel.

> **Important:** Option AC (China power plug) is not available for the TDS694C.

> Recommended pairing: the P6249 4 GHz active probe is the TDS694C's companion probe, sized to contact fine-pitch, high-density boards with a short ground connection that preserves maximum system bandwidth.

## 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:** Dig Oscilloscope, Digital, Inc., Manufacturers, Model 684, Oscilloscopes, Pre-Owned, product_manual_group_1, Product_used, TDS684, TDS684C, 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 TDS684C 1 GHz Digital Storage Oscilloscope (Pre-Owned)

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> Source: [ValueTronics](https://valuetronics.com/products/tds684c-tektronix-digital-oscilloscope-used)
> Updated: 2026-06-03