VM700T Option 20

Teletext Measurements

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Features & Benefits

  • Adds Teletext Measurement to Measure and Monitor Signals for Either NTSC or PAL Systems
    • Eye Height
    • Eye Width
    • Data Level
    • Start-of-Code
    • Number of Run-in Bits

Applications

  • In-Service Monitoring of Teletext Signals
  • Troubleshooting Teletext Problems
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Teletext Measurements

Tektronix is the worldwide leader supplying test equipment for the entire range of video and audio signal applications. Our video and audio test portfolio consists of signal processing, generation and measurement equipment for broadcast, cable, production, manufacturing and transmission applications.

The VM700T Option 20 provides the capability to measure and monitor teletext signals for either NTSC or PAL systems. Option 20 adds the Teletext measurement to the Measure mode of the VM700T. The measurement can be made on teletext signals with clocks of 5.727272 MHz for System M (NTSC) or 6.9375 MHz, 6.2031 MHz and 4.4375 MHz for System B/G/I (PAL). Other clock frequencies are available.

The measurement displays the teletext eye height pattern along with numbers for both eye height and eye width. A soft key selection can add a histogram display of all amplitudes or the amplitudes at any point at the clock. This is a useful statistical tool for seeing noise and jitter in the teletext signal. A grading display of eye height is also provided at the touch of a soft key. This provides visual feedback on density levels for "ones" and "zeros." A timing display of the teletext signal provides data timing from leading edge of sync to last run-in bit and run-in bit width. Also at the touch of a soft key are horizontal or vertical cursors which are useful for manual measurements.

All of these parameters can be reported in a numerical format over the RS-232C interface or sent to a printer. In addition, the measurements can be tested against upper and lower user defined limits.

Characteristics

Data Input Range - -170 mV to 840 mV.

Measurement

Range

Accuracy

Eye Height (Decoding Margin)

30 to 100%

±3%

Eye Width (Timing Margin)

30 to 100%

±3%

Data Level

-170 mV to 840 mV

±3%

Start-of-Code (Data Timing)

10 to 15 µs

±10 ns

Number of Run-in Bits

5 to 25 bits

NA

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