WFM1125, Opt. 0A, 0B, 0C, and 0D

High Definition Waveform Monitor

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Features & Benefits

  • Waveform/Vector Monitor for HDTV Baseband Video
  • Two SMPTE 292M, 1.485 Gb/s Serial Component Inputs
  • Available for 1920×1080i, 1280×720p, or Dual Digital Video Formats
  • Multiformat Option Adds 1920×1080i/50, 1920×1080/24sF, and 1920×1080p/24 Formats
  • Parade and Overlay Waveform Displays in RGB, GBR, or Y/Pb/Pr
  • Vector display for 240M or 274M Colorimetry
  • Tektronix Diamond, Lightning, and Bowtie Displays
  • Expanded Waveform Scales for Extended Accuracy
  • Waveform Save Mode for Signal Comparison
  • NTSC or Trilevel External Reference
  • Analog Y/Pb/Pr and Digital Picture Monitor Outputs
  • AES/EBU Output of Audio Embedded in SMPTE 274M Data (1920×1080i/60 Format)
  • Gamut, Status, and Line-by-Line CRC Monitoring
  • VGA Display and Screen Output


  • Digital High-Definition Baseband Monitoring for Production and Broadcast

Digital Television Waveform Monitor

The WFM1125, equipped with Opt. 0A, 0B, 0C, or 0D, is the latest in a series of Tektronix high-definition waveform monitors to both acquire and display the SMPTE 292M television signal in its native digital format. All signal processing is mathematical, resulting in very high display accuracy, even in magnified modes. The only analog processing is an instrument reference to external trilevel or NTSC sync and conversion of the digital signal for output to an external analog picture monitor.

Handling the digital signal without conversion to analog provides several distinct user advantages. Waveforms and screen graphics are clear and bright on the instrument VGA display and the WFM1125 display can be output to a conventional VGA computer monitor for easy viewing in large operating centers. The operator can view video data in its raw, unfiltered form, or mathematically accurate filters may be applied. The operator can store a display for reference, allowing comparison of one video signal to another. The engineer is assured the display is accurate and directly related to data values. And AES/EBU audio embedded in the 1920×1080i/60 video format can be easily extracted for thorough evaluation using a companion Tektronix 764 digital audio monitor.

The WFM1125 selects between two SMPTE 292M, 1.485 Gb/s data signals transporting video and, in the 1920×1080i/60 high-definition format (Opt. 0A, 0C, or 0D), embedded audio. Opt. 0B monitors video signals in the SMPTE 296M, 1280×720p high-definition format.

The operator may display data signals as video waveforms in Y/Pb/Pr, RGB, or GBR format. A color vector display of the Pb and Pr color difference components is provided for color matching, with graticules corresponding to 75% or 100% color bars with SMPTE 240M (BTA-S001A) or SMPTE 274M (ITU-R BT.709) colorimetry. A Diamond gamut display provides a reliable indicator which allows the graphics operator maximum color flexibility without violating RGB color space. Lightning and Bowtie displays assist the engineer in camera and system setup. These displays can be stored for reference, facilitating camera and graphics matching.

SMPTE 292M error checking is fully supported by the WFM1125 on a line-by-line basis for luminance and chrominance components. A rear-panel signal may be enabled to trigger external equipment in the event of a data CRC error. Engineers will appreciate the WFM1125's data list feature, with quick access to ancillary data locations.

The Tektronix WFM1125 is ideal for both operational and technical monitoring applications. Its selection of video displays and display storage capabilities provide the tools needed by operators to efficiently monitor the creation and correction of digital high-definition signals. This same instrument provides the data analysis capabilities needed by the engineer to setup digital high-definition sources and systems for conformance to standards, compatibility with other devices, and best technical quality. The Tektronix WFM1125 digital high-definition waveform monitor is the definitive tool for operators and engineers in the new high-definition DTV environment.


Uninterpolated display shows discrete data word steps.


Bowtie display is available to resolve channel-to-channel timing.


Waveform may be displayed RGB or Y/Pb/Pr.


30 MHz sweep display magnified x10.


Lightning display aids setup of component recorders.


Vector display includes I and Q axis guides for color correction applications.


Out-of-gamut RGB components are easily identified with the Tektronix Diamond display.


Serial Digital Interface

Video Inputs - Two 1.485 Gb/s SMPTE 292M/BTA-S004A compatible

Impedance - 75 Ohm BNC, internally terminated

Monitor Output - 1.485 GB repeat of selected input

Output Level - 800 mVp-p ±10%

External Reference Input

Sync Format - RS-170A, SMPTE 240M, SMPTE 274M

DC Input Impedance - >15 kilohm

Timing Uncertainty - <5 ns

Analog Picture Monitor Output

Format - Y, Pb, Pr, with trilevel sync on Y channel

DAC Resolution -

Luminance Channel: 9 bit

Chrominance Channels: 10 bit

Impedance - 75 Ohm unbalanced

AES/EBU Digital Audio Output (1920×1080i/60 Format Only)

Format - ANSI S.4.40

Amplitude - 1.0 V ±10%

DC Offset - 0.0 V ±50 mV

Rise/Fall Time - 30 ns to 44 ns

Output Channels -

CH A: 1/2, 3/4, 5/6, 7/8; CH B: 1/2, 3/4, 5/6, 7/8

Different channel pairs must be selected for CH A and CH B

Vertical Deflection System

Frequency Response -

Luminance (Y) Channel: 50 kHz to 30 MHz within 0.5% of response at 50 kHz

Chrominance Channels: 50 kHz to 15 MHz within 0.7% of response at 50 kHz

LOWPASS: ≥10 dB at 15 MHz

Gain - X1, X5, X10, frequency response accuracy is maintained in X5 and X10

Offset - CH2 and CH3 may be offset from CH1 by 350 mV

Cursor Accuracy - <0.25% for full scale

Horizontal Deflection System

Sweep - Displays "NO SIGNAL" message when no signal is present

Rates - 1 line, 2 line, 3 line, 1 field

Line Select - Selected line in 1 line, selected line 1st in 2 line

Cursor Accuracy - ≤0.25% for full scale

Component Vector Mode

Frequency Response - >14 MHz

Vertical Gain Accuracy - <0.25%

Horizontal Gain Accuracy - <0.25%

Magnification - X1, X5, X10

Display - Pb horizontal, Pr vertical

Lightning and Diamond Modes

Vertical Gain Accuracy - <0.25%

Horizontal Gain Accuracy - <0.25%

Lightning Display - Y is displayed vertically. Pb is displayed horizontally on top half of display. Pr is displayed horizontally on bottom half of display.

Diamond Display - GBR deflection axis indicated on display

Bowtie Mode

Common Mode Rejection Ratio - >44 dB to 15 MHz

Accuracy - <0.25%

Internal Timing Match - 0 clock cycles

RGB Transcoder

Matrix Coefficients - SMPTE 240M (BTA-S001A) or SMPTE 274M (ITU-R BT.709)

Status Display

Word Range - 1.82 lines (4000 words)

Display Format - HEX, DEC

Save and Display Waveform

Delay Time from Button Push - Less than three frames

Reference Memory Size - One frame

Warning Display

CRC Error LED - Remains on 0.5 seconds after error

CRC Error Count - Number of errors and time since last start

GAMUT Error - Nominally 105% of legal RGB

Instrument Setups

Number of Memories - Four setups

Save/Recall - Front-panel or remote ground closure


Display Area - 9.5-cm horizontal × 7.1-cm vertical

Resolution - 640 H × 480 V pixels


WFM1125 rear panel

Environmental, EMC, Safety

Temperature - Operating: 0 to +40 °C

Humidity - Operating: 20% to 80%, noncondensing

Altitude - Operating: Up to 15,000 ft. (4,572 m)

Shock - Operating: 294 m/s2 (30 G), half sine, 11 ms duration

Safety Compliance - UL 3111-1, CSA1010.1, EN61010-1, IEC61010-1. MC=UL1244

Emission - EN 55011, EN 61000-3-2

Immunity - IEC 61000-4-2, 61000-4-4; EN 61000-4-11; ENV 50140, 50142, 50204; FCC Part 15, Subchapter B, Class A


Source Power -

Voltage Ranges: 90 to 240 V AC

Line Frequency: 48 to 63 Hz

Power Consumption - 90 W, 100 VA maximum

Physical Characteristics




















One year, return to Tektronix Factory Service Center.

Last Modified: 1997-09-01 05:00:00

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