# Tektronix TDS 640A Four-Channel Monochrome 500 MHz, 2 GS/s Digital Real-Time Oscilloscope (Pre-Owned) # Tektronix TDS 640A Four-Channel Monochrome 500 MHz, 2 GS/s Digital Real-Time Oscilloscope (Pre-Owned) ## Key Features At A Glance - Real-time bandwidth from 500 MHz to 1 GHz with sample rates from 2 GS/s to 5 GS/s across the series - Available in 2- and 4-channel configurations with monochrome or color VGA displays - 8-bit vertical resolution, greater than 11 bits with averaging - Record length to 15,000 points per channel (2,000 points on the 2 GS/s model) - RS-232, Centronics, GPIB, and VGA I/O ports standard for automation and hardcopy output - Fully automated measurement system with 25 automatic measurements and pass/fail template testing - Advanced waveform DSP: FFT, integration, differentiation, and waveform limit testing - Maximum input voltage 300 V CAT II, ±400 V peak (derate above 1 MHz) The Tektronix TDS 600B Series is a family of Digital Real-Time oscilloscopes built around Tektronix's Digital Real-Time architecture, which is designed to simplify capturing intermittent signals and non-recurring events such as glitches or metastable states caused by setup-and-hold-time violations. The series provides design engineers with single-shot accuracy for multi-channel, high-speed signal characterization. An oscilloscope displays electrical signals as waveforms—voltage plotted against time—making signal amplitude, timing, and shape directly visible on screen. The TDS 600B Series is applied to digital design characterization and verification, telecommunications and datacommunications work, transient event capture, and high energy physics. Tektronix positions the architecture for high-bandwidth design problems such as crosstalk noise, transmission effects, ground bounce, and sub-nanosecond edges. ValueTronics stocks and holds its own inventory in a 20,000-square-foot secure warehouse at 1675 Cambridge Drive in 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 from the manufacturer. That combination lets engineers source both new and verified used test equipment from a single accountable supplier. ## Compare Other Models in This Series The TDS 600B Series groups five Digital Real-Time oscilloscopes—the TDS 684B, TDS 680B, TDS 644B, TDS 620B, and TDS 640A—under a shared architecture that targets high-speed, single-shot signal characterization. The models share 8-bit vertical resolution (greater than 11 bits with averaging), advanced waveform DSP, and a common standard I/O set of RS-232, Centronics, GPIB, and VGA. Where the models diverge is in real-time bandwidth, sample rate, channel count, and display type. The series spans 500 MHz and 1 GHz bandwidths, 2 GS/s to 5 GS/s sample rates, and two- or four-channel configurations offered in monochrome or color. Each model in the series is listed below as its own dedicated product page with condition-matched pricing. Select the pre-owned configuration that fits your bandwidth, sample-rate, and channel requirements, and compare the per-model specifications in the table that follows. The TDS 684B is the four-channel color configuration rated at 1 GHz real-time bandwidth and 5 GS/s on all channels simultaneously, with time-measurement accuracy specified at under 50 ps typical at 5 GS/s single shot. The 1 GHz bandwidth and 5 GS/s sample rate belong to the TDS 684B and TDS 680B, while the TDS 644B, TDS 620B, and TDS 640A provide 500 MHz bandwidth. Sample rates step from 2 GS/s on the TDS 640A to 2.5 GS/s on the TDS 620B and TDS 644B and 5 GS/s on the TDS 680B and TDS 684B. Channel counts and display type vary as well, as detailed in the comparison table. Record length per channel reaches 15,000 points on the TDS 684B, TDS 680B, TDS 644B, and TDS 620B, while the TDS 640A provides up to 2,000 points. Peak detect and channel deskew are available across the series except on the TDS 640A. Refer to the table for each model's exact bandwidth, sample rate, channel count, record length, and standard probe set. Model Bandwidth Sample Rate Channels **TDS 640A** 500 MHz 2 GS/s 4 TDS 684B 1 GHz 5 GS/s 4 TDS 680B 1 GHz 5 GS/s 2 TDS 644B 500 MHz 2.5 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 - Four P6139A Passive Probes - User Manual (070-9869-00) - Quick Reference Guide (070-9382-00) - Programmer's Manual in MS-Help format on floppy disk (063-2773-00) - Technical Reference Manual (070-9874-02) - Front Cover (200-3696-00) - North American Power Cord (161-0230-01) ## Product Core & Specifications Specification Value Model Comparison Total Channels TDS 640A: 4; TDS 620B: 2 + 2; TDS 644B: 4; TDS 680B: 2 + 2; TDS 684B: 4 Sample Rate (all channels simultaneously) TDS 640A: 2 GS/s; TDS 620B: 2.5 GS/s; TDS 644B: 2.5 GS/s; TDS 680B: 5 GS/s; TDS 684B: 5 GS/s Real-time Bandwidth TDS 640A: 500 MHz; TDS 620B: 500 MHz; TDS 644B: 500 MHz; TDS 680B: 1 GHz; TDS 684B: 1 GHz Maximum Record Length per Channel TDS 640A: 2,000 pts; TDS 620B: 15,000 pts; TDS 644B: 15,000 pts; TDS 680B: 15,000 pts; TDS 684B: 15,000 pts Vertical Resolution 8-Bits; >11-Bits with averaging Time Measurement Accuracy TDS 640A: <110 ps @ 2 GS/s; TDS 620B: <100 ps @ 2.5 GS/s; TDS 644B: <100 ps @ 2.5 GS/s; TDS 680B: <50 ps @ 5 GS/s; TDS 684B: <50 ps @ 5 GS/s Advanced Waveform DSP/Math Standard (all models) Standard Probes TDS 640A: 4 P6139A; TDS 620B: 2 P6139A; TDS 644B: 4 P6243; TDS 680B: None; TDS 684B: None Display Type TDS 640A: 7 in. mono; TDS 620B: 7 in. mono; TDS 644B: 7 in. color; TDS 680B: 7 in. mono; TDS 684B: 7 in. color Disk Drive Standard (all models) GPIB Port Standard (all models) RS-232 & Centronics Standard (all models) VGA I/O Port / Printer Ports TDS 640A: Std. Mono; TDS 620B: Std. Mono; TDS 644B: Std. Color; TDS 680B: Std. Mono; TDS 684B: Std. Color Time Base System Time Bases Main and Delayed Time/div Range 200 ps/div to 10 s/div. Except TDS 640A: 500 ps/div to 5 s/div. Time Base Accuracy Over Any Interval >1 ms ±100 ppm Record Length per Channel 500 to 15,000 pts. Except TDS 640A: 500 to 2,000 pts. Vertical System Vertical Resolution 8-Bits (>11-Bits with averaging) Sensitivity 1 mV/div to 10 V/div DC Gain Accuracy 1.50% Maximum Input Voltage 300 V CAT II ±400 V peak. Derate at 20 dB/decade above 1 MHz. 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 Acquisition Modes Peak Detect (TDS 620B, TDS 644B: 1 ns; TDS 680B, TDS 684B: <1 ns), Sample, Single Sequence, Envelope, Average Triggering System Trigger Types Edge (main and delayed); Pulse (Width, Glitch, Runt, Slew Rate, Time Out); Logic (Pattern, State, and Setup & Hold Time Violation); HDTV Video (optional). Slew Rate, Time Out, and Setup & Hold Time Violation not available in TDS 640A. Automatic Measurements 25 (on entire record or gated region) Waveform Functions Interpolation (sin(x)/x or linear), Average, Envelope, Auto Setup Measurement Accuracy TDS 680B/684B: <50 ps typical @ 5 GS/s single shot; TDS 620B/644B: <100 ps typical @ 2.5 GS/s single shot; TDS 640A: <110 ps @ 2 GS/s single shot Advanced Waveform Functions FFT, Integration, Differentiation, Waveform (math or acquired) Limit Testing > **Important:** Maximum input voltage: 300 V CAT II, ±400 V peak; derate at 20 dB/decade above 1 MHz. > **Important:** The TDS 680B and TDS 684B ship without standard probes (Standard Probes: None). Appropriate probes must be ordered separately - e.g., Opt. 26 (four P6245 1.5 GHz FET Probes for TDS 684B) or Opt. 27 (two P6245 1.5 GHz FET Probes for TDS 680B), or see Recommended Accessories. > **Important:** 1 ns Peak Detect and Channel Deskew are not available on the TDS 640A. > **Important:** On the TDS 640A, the Slew Rate, Time Out, and Setup & Hold Time Violation trigger functions are not available. > Recommended pairing: P6245 1.5 GHz FET probes or P6243 1 GHz active probes for high-bandwidth probing, with the K420 instrument cart for bench mobility. ## 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 - 262.5 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 | 187.50 USD | In stock | | NIST Traceable with Full Data | 225.00 USD | In stock | | ISO IEC 17025 Accredited | 262.50 USD | In stock | ## Images - Tektronix TDS 640A Four-Channel Monochrome 500 MHz, 2 GS/s Digital Real-Time Oscilloscope (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/tds640a-tektronix-digital-oscilloscope-used) > Updated: 2026-06-03