User manual TEKTRONIX ASG140 DATASHEET

[. . . ] Test signal capability starts with simple line up, polarity, and level signals. Added to these are tone sweeps for checking distortion, frequency response and crosstalk. Industry standard CCITT 0. 33 signals and newly developed Multitone signals support advanced audio analysis capability found in the VM 700A. Digital synthesis of signals ensures signal stability and repeatability. [. . . ] These requirements are satisfied by the Tone set available in Tektronix signal generators. One combination of Tone amplitude and frequency may be saved as a default value. This might be used as a test signal or can even be used for an alert or warning signal. 0. 58 V ­2. 3 ms 2. 3 ms ­0. 31 V Figure 1. Polarity signal waveform. Frequency 25 Hz 31 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1000 1250 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000 Length 1 Sec 1 1 1 1 1 1 1 1 1 1 1 1 1 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 Total Time 1. 0 Sec 2. 0 3. 0 4. 0 5. 0 6. 0 7. 0 8. 0 9. 0 10. 0 11. 0 12. 0 13. 0 14. 0 14. 5 15. 0 15. 5 16. 0 16. 5 17. 0 17. 5 18. 0 18. 5 19. 0 19. 5 20. 0 20. 5 21. 0 LINE UP permits users to define a tone to be used for alignment purposes. In this case, a frontpanel button affords easy access to this signal. VOICE plays back 4 seconds of user-recorded signal intended for voice ID purposes. This signal is recorded by the front-panel microphone incorporated in the signal generator. POLARITY is a troubleshooting signal consisting of an asymmetrical waveform (Figure 1). This signal may be used to detect if the plus and minus connectors of an audio conductor have been reversed. Its suggested uses include determining the noise floor of a system as well as providing a rapid way to silence an output signal. SWEEP generates frequency sweep signals on Left, Right or both channels simultaneously. When a Left or Right Sweep is active, the undriven channel is grounded through its characteristic impedance. The amplitude of the Sweep signal is controlled by a programmable "Sweep Level" control. Table 1 describes the sweep frequencies and durations. Sweep signals are commonly used to measure particular audio characteristics over a frequency range. For example, Sweep provides a constant amplitude signal throughout the frequency range. When this signal passes through a system, the resulting output signal indicates the amplitude response of that system. Other uses for Sweep include the measurement of distortion vs. L Sweep and R Sweep provide signals that enable a user to measure crosstalk or channel isolation vs. The levels of Sweep, L Sweep and R Sweep are programmable. [. . . ] However, TEK:90-95 sequences include test signal level information in the identifying preamble. This further simplifies the implementation of test schemes. CCITT and TEK autosequences are ideal for testing telecommunication and broadcast contribution links. Since the identifying preamble coordinates generator and analyzer, split site tests, whether performed over an STL, satellite link, or coast-to-coast copper or fiber connection are simple to use. In total, 6 CCITT and 6 Tektronix autosequences are available. [. . . ]