TEK TDS 644A Digital Real-Time Oscilloscopes

Features

• 500 MHz bandwidth (TDS 620A/644A);
  1 GHz (TDS 684A)
• Sample rates to 2 GS/s on four channels (TDS 620A/644A);
  5 GS/s (TDS 684A)
• 2 and 4 input channels (TDS 620A/644A);
  4 input channels (TDS 684A)
• Pulse width, 2 ns (TDS 684A) glitch;
  1 ns (TDS 620A/644A), runt, pattern and state triggering
• 1 mV/div -10 V/div sensitivity
• Infinite and variable persistence
• Color Grading
• Record lengths to 15,000 points
• 8-bit vertical resolution
• High resolution color monitor
• 3.5 inch DOS floppy disk drive
• Vertical accuracy to 1.5%
• Tek TriStar^TM (DSP) processor
• Slew Rate and Setup & Hold Violation triggers
• Waveform pass/fail testing
• Advanced signal processing functions (TDS 684A)
• 25 automatic measurements
• Full GPIB programmability
• Desktop publishing outputs
• 1.5 GHz, 1 pF, 1 Megohm probe option
• Segmentable acquisition memory (TDS 620A/644A)
• VGA output

Specifications

Channels:
4 (TDS 644A/684A)
2+2 auxiliary (TDS 620A)

Samplers:
2 (TDS 620A)
4 (TDS 644A/684A)

Bandwidth*:
1 GHz ** (TDS 684A)
500 MHz*** (TDS 620A/644A)

* Reduce the upper bandwidth frequencies by 2.5 MHz for each degree C above 30 degree C.

** 50 ohm; 1 mV/div: 500 MHz, 2 mV/div: 600 MHz, 5 mV/div: 900 MHz. Reduce the upperbandwidth frequencies by 5 MHz for each degree C above 30 degree C.

*** 1 mV/div: 200 MHz, 2 mV/div: 300 MHz.

CH1, CH2: 1 mV to 10 V/div

CH3, CH4: 1 mV to 10 V/div (TDS 644A/684A)

AUX 1, AUX 2:
1 mV to 10 V/div (TDS 620A)

Position Range: ±5 Divisions.

CH1, CH2:
±1 V from 1 mV to 100 mV/div (TDS 684A)
±1 V from 1 to 99.5 mV/div (TDS 620A/644A)

AUX 1, AUX 2:
±10 V from 101 mV to 1 V/div, ±100 V from 1.01 V to 10 V/div (TDS 684A)
±10 V from 100 mV to 995 mV/div, ±100 V from 1 to 10 V/div (TDS 620A)

CH3, CH4:
±1 V from 1 mV to 100 mV/div (TDS 684A)
±1 V from 1 to 99.5 mV/div (TDS 644A)

Any One Channel:
2 GS/s (TDS 620A/644A)
5 GS/s (TDS 684A)

Any Two Channels:
2 GS/s (TDS 620A/644A)
5 GS/s (TDS 684A)

Four Channels:
2 GS/s (TDS 644A)

Three, Four Channels:
5 GS/s (TDS 684A)

Any One Channel:
2K (TDS 600A)
15K pts (TDS 684A)

Any Two Channels:
2K (TDS 600A)
15K pts (TDS 684A)

Any Four Channels:
2K (TDS 600A)

Any Three, Four Channels:
15K pts (TDS 684A)

Time Bases: Main, Delayed.

Time Base Range: 500 ps to 10 s/div.
200 ps to 10 s/div. 4 ps to 200 s/div (TDS 684A)

Time Base Accuracy: ±100 ppm (TDS 600A) (over any interval >/=1 ms)

Pre-Trigger Position:
20% to 80% of any record (TDS 620A/644A)
0% to 90% (TDS 684A)

Delay Between Channels: </=250 ps (TDS 600A) (any 2 channels with equal V/div and coupling)

DC Gain Accuracy:
±1.5% (TDS 600A)

Vertical Resolution: 8 bits (256 levels over 10.24 vertical divisions). >11 bits with averaging.

Analog Bandwidth Selections:
20 MHz, 100 MHz, and full (TDS 620A/644A)
20 MHz, 250 MHz, and full (TDS 684A)

Step Response Settling: </=0.5% error within 20 ns of a </=2 V step.

Effective Bits:
6.3 Bits (1 GHz @ 5 GS/s) (TDS 684A)
9.0 Bits (500 MHz at 2 GS/s) (TDS 620A/644A)

Input Coupling: AC, DC or GND.

Input Impedance Selections: 1 Megohm in parallel with 10 pF, or 50 ohm (AC and DC coupling).

Maximum Input Voltage: ±400 V (DC+ peak AC). Derate at 20 dB/decade above 1 MHz. 1 Megohm or GND coupled.

Channel Isolation: >/=100:1 at 100 MHz and >/=30:1 at bandwidth for any two channels having equal Volts/div settings.

AC Coupled Low Frequency Limit: </=10 Hz when AC 1 Megohm coupled. </=200 kHz when AC 50 ohm coupled.

Sample: Sample data only.

Envelope: Max/min values acquired over one or more acquisitions.

Average: Waveform averages selectable from 2 to 10,000.

Single Sequence: Use Run/Stop button to capture a single triggered acquisition at a time which may be automatically saved to NVRAM with AutoSave.

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.

PULSE (main):

WIDTH: Trigger on width of positive or negative pulse either within or not within selectable time limits. Time limits settable from 2 ns to 1 s.

GLITCH: Trigger on or reject glitches of positive, negative or either polarity. Minimum glitch width threshold is 2.0 ns, with 200 ps resolution.

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

PATTERN: Specifies a logical combination (AND, OR, NAND, NOR) of the four input channels (Hi, Lo, Don't Care). Trigger when pattern stays True or False for user specified time.

STATE: Any logical pattern of channels 1, 2 and 3 (AUX1 on TDS 620A) plus clock edge on channel 4 (AUX2 on TDS 620A). Triggerable on positive or negative clock edge.

Video (Optional) NTSC, PAL, HDTV, FlexFormat^TM: Trigger on a particular line of individual, odd/even, or all fields. Trigger on a specific pixel of a line by using video trigger with delay by events. Choose horizontal sync polarity. Choose from popular HDTV formats (1125/60, 1050/60 1250/50, 787.5/60) or use FlexFormat^TM for other HDTV-type formats by defining frame rep rate, number of lines and fields, and sync timing structure.

Triggers: Main, Delayed.

Main Trigger Modes: Auto, Normal, Single.

Delayed Trigger: Delayed by time, events, or events and time.

Time Delay Range: 16 ns to 250 s.

Events Delay Range: 1 to 9,999,999 events.

External Rear Input: >/=1.5 kilohm; Max input voltage is ±20 V (DC + AC peak).

Waveform Style: Dots, vectors, variable persistence selectable from 250 ms to 10 s, infinite persistence, and intensified samples.

Color: Standard palettes and user definable colors 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: (TDS 644A/684A only) With variable persistence selected, historical timing information is represented by temperature or spectral color scheme providing "z-axis" information about rapidly changing waveforms.

Gray Scaling: With variable persistence selected, waveform points time-decay through 16 levels of intensity.

Waveform Capture Rate: For 500 point waveforms with infinite persistence mode selected: 100/sec typically.

Graticules: Full, grid, cross hair, frame. NTSC and PAL with video trigger option.

Format: YT and XY.

Fit to Screen: Entire acquisition memory displayed on screen.

The zoom feature allows waveforms to be expanded or compressed in both vertical and horizontal axes. Allows precise comparison and study of fine waveform detail without affecting ongoing acquisitions. When used with HiRes or Average acquisition modes, Zoom provides an effective vertical dynamic range of 1000 divisions or 100 screens.

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. NTSC IRE and Line Number with video trigger option.

Time Measurements Accuracy: (Single Shot Typical)
<50 ps typical (TDS 684A)
<110 ps @ 2 GS/s (TDS 620A/644A)

Cursor Types: Horizontal bars (volts); Vertical bars (time); operated independently or in tracking mode.

Waveform Functions: Interpolate-selectable sin(x)/x or linear, Average, Envelope.

Advanced Waveform Functions: (Standard on TDS 644A/684A) FFT, Integration, Differentiation.

Arithmetic Operators: Add, Subtract, Multiply, Divide, Invert.

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

Waveform Limit Testing: Compares incoming or math waveform to a reference waveform's upper and lower limits.

GPIB (IEEE-488.2) Programmability: Full talk/listen modes. Control of all modes, settings, and measurements.

Printer: HPThinkjet, Epson, Interleaf, Deskjet, Laserjet, PostScript, TIFF, PCX, BMP (Microsoft Windows), DPU 411/412, RLE.

Plotter: HPGL.

Interface: GPIB standard.

Hardcopy Interface: (Standard on TDS 644A/684A) Centronics and RS-232.

Waveforms:
4 full 2,000 point waveforms. (TDS 620A/644A)
Four 15 K point records. (TDS 684A)

Setups: 10 front panel setups.

Floppy Drive: (Standard on TDS 644A) Store reference waveforms, setups, and image files on 3.5 inch 1.44 MByte or 720 KByte DOS format floppy disk.

Type: (TDS 620A) 7 in. diagonal, magnetic deflection. Horizontal raster-scan. P4 White phosphor.

Type: (TDS 644A/684A) 7 in. diagonal, NuColor[TM] liquid crystal full color shutter display. 256 color levels.

Resolution: 640 horizontal by 480 vertical displayed pixels (VGA).

Line Voltage Range: 90 to 250 V RMS.

Line Frequency: 45 to 440 Hz.

Power Consumption: 300 Watts max.

Temperature:
Operating: +4 to +50 degree C (floppy not used).
+10 to +50 degree C (floppy in use).
+4 to +45 degree C (floppy not used) (TDS 684A)
+10 to +45 degree C (floppy in use) (TDS 684A)
Nonoperating: -22 to +60 degree C.

Humidity:
Operating (floppy not used): To 80% RH at </=32 degree C. Derates to 30% RH at +45 degree C.
Operating (floppy in use): To 80% RH at </=32 degree C. Derates to 30% RH at +45 degree C.
Nonoperating: To 90% RH at </=40 degree C. Derates to 30% RH at +60 degree C.

Altitude:
Operating: 15,000 ft.
Nonoperating: 40,000 ft.

Electromagnetic Compatibility: Meets or exceeds Vfg. 243/1991 amended per Vfg. 46/1992; FCC 47 CFR, Part 15, Subpart B, Class A; EN 50081-1; and EN 50082-1.

Safety: Listed UL 1244; CSA - C22 No. 23; Tektronix self-certification to comply with IEC 348 recommendations.

Dimensions:
Height (with feet): 193 mm (7.6 in.)
Height (without feet): 178 mm (7.0 in.)
Width (with handle): 445 mm (17.5 in.)
Depth (with front cover installed): 434 mm (17.1 in)
Net Weight: approx. 14.1 kg (31 lb.)
Shipping Weight: approx. 25.4 kg (56 lb.)

Ordering Information

TEK TDS 644A Digital Real-Time Oscilloscopes

TDS 600A Digitizing Oscilloscopes
Includes: Two each P6205 probes (TDS 620A/644) Two each P6243 probes (TDS 644B) Four each P6243 probes (TDS 620B); Reference Manual (070-8711-01); User Manual (070-8715-01); Technical Reference Manual (070-8717-01); Programmer Manual (070-8709-06); Front cover (200-3696-01); U.S. Power Supply (161-0230-01).

TDS 684A Digitizing Oscilloscopes
Includes: Reference Manual (070-8999-02); User Manual (070-8991-02); Technical Reference Manual (070-8990-03); Programmer Manual (070-8709-06); Front cover (200-3696-01); U.S. Power Supply (161-0230-01); Accessory Pouch (016-1268-00).

Opt. 05: Add Video Trigger; NTSC, PAL, HDTV, FlexFormat^TM.

Opt. 1F: (TDS 620A only) Add 3.5 inch floppy disk drive.

Opt. 1K: K420 scope cart without power strip.

Opt. 1R: Rack Mount.

Opt. 2D: (TDS 620A only) Delete 2 ea standard probes.

Opt. 2F: (TDS 620A only) Extended waveform math; FFT, Integration, Differentiation.

Opt. 2P: (TDS 644A/684A only) Tektronix Phaser[TM] 200e thermal wax transfer color printer.

Opt. 4D: (TDS 644A only) Delete 4 ea standard probes.

Opt. 13: (TDS 620A only) Add RS 232C and Centronics hardcopy interfaces.

Opt. 23: (all except TDS 644A) Add 2 ea P6205 active probes.

Opt. 24: Add 4 ea P6139A probes.

Opt. 26: (TDS 684A only) Add 4 ea. P6245 1.5 GHz active probes.

Opt. 95: NIST, MIL-STD-45662A and ISO 9000 calibration certification.

Opt. 96: Calibration data.

FET Probe: 1 GHz. Order P6204

500 MHz Passive Probe: Order P6139A

750 MHz FET Probe: Order P6205

1 GHz FET Probe: Order P6245

4 SMD Probes: Order P6563AS

Optical Converter: 500 nm to 950 nm. Order P6711

Optical Converter: 1100 nm to 1700 nm. Order P6713

High Voltage Probe: Order P5100

DC/AC Current Probe System: Order AM 503S

10 mV Differential Probe: Order ADA400A

TDS 600A Service Manual: Order 070-8718-02

Accessory Pouch: Order 016-1268-00

Soft-sided Carrying Case: Order 016-0909-01

Transit Case: Order 016-1135-00

Four Color Plotter: Order HC100

LabView for PC Windows System: Order LVWIN

WaveWriter: AWG and waveform creation. Order S3FT400

Labwindows for DOS System: Order LWDOS

Labwindows for CVI System: Order LWCVI

RS232: Order 012-1298-00

Centronics: Order 012-1250-00

GPIB: 1 M. Order 012-0991-01

GPIB: 2 M. Order 012-0991-00