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Audio Signal Generators: Two Channel ASG 100 Four Channel ASG 140
Tektronix audio generators offer potent solutions for audio testing. The two-channel ASG 100 and four-channel ASG 140 combine compact size, ease-of-use and programmability. Operated manually or automatically, they produce signals used for aligning, servicing and testing of audio facilities. 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. The ASG 100/140 are operated by simple front-panel controls. Alternately, users may operate these generators via their rearpanel RS-232 remote control port. Supporting a variety of baud
Copyright (c) 1997, Tektronix, Inc. All rights reserved.
rates, this interface permits seamless integration of audio signal generators in ATE test schemes. A wide variety of editing schemes permits user-defined values to be stored for later reuse. ASG 100 Applications The two-channel ASG 100 is for situations where the generator is inserted in-line with the audio path of interest. When used in this fashion, the ASG 100 can insert a variety of test signals into the audio program. The output impedance is programmable, allowing it to be used with either power-matched or voltage-driven signal distribution schemes. ASG 140 Applications The ASG 140 is designed for situations requiring no in-line connections. Its four audio outputs are grouped in two stereo pairs making it the ideal choice for service and alignment of MII, Betacam, D1, D2, D3,... VTRs. Its audio output features 10fi output impedance.
COMMON FEATURES 20 Hz to 20 kHz 24 dBu to -90 dBu 4 second Voice ID Balanced XLR signal paths CONTROLS RS-232 remote control Front panel lockout Contact closure SPECIAL MEASUREMENT SIGNALS Multitone test signals Audio/video delay signals CCITT 0.33 signals TEKTRONIX autosequences ASG 140 FEATURES Four balanced XLR signals Fixed 10 Ohm output impedance ASG 100 FEATURES Balanced, loop-through operation Programmable output impedance
Output Signals Several different types of audio test signals, ranging from simple to complex, are produced. The most basic of these signals are simple tones. Tone, L Tone and R Tone consist of sine waves that are programmable in amplitude and frequency. Many standard test procedures specify tones for their purpose. 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. SILENCE is an active mute signal. 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. frequency and phase response vs. frequency. L Sweep and R Sweep provide signals that enable a user to measure crosstalk or channel isolation vs. frequency. The levels of Sweep, L Sweep and R Sweep are programmable. A particular level may be defined as the user default value.
Table 1. ASG 100 & ASG 140 Sweep Signals.
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CCITT 0.33:01
Seconds 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 8 Freq. L 1650/1850 1020 1020 40 80 200 500 820 1900 3000 5000 6300 9500 11500 13500 15000 1020 -- 60 2040 -- 820 820 820 -- Freq. R 1650/1850 1020 1020 40 80 200 500 820 1900 3000 5000 6300 9500 11500 13500 15000 1020 -- 60 -- 2040 820 820 820 -- Level 12 dBm0 0 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 +9 -- +9 -12 -12 +6 -6 +6 -- Seconds 1.0 1.0 1.0 .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 .500 1.0 1.0 2.0 Freq. L 1650/1850 400 400 15000 13999 12503 11243 9001 7500 6203 3499 953 400 101 50 400 --
TEK:90
Freq. R 1650/1850 400 400 15000 13999 12503 11243 9001 7500 6203 3499 953 400 101 50 400 -- Level -12 0 -8 dB -8 -8 -8 -8 -8 -8 -8 -8 -8 -8 -8 -8 +10 --
Table 2. Examples of Autosequences produced by the ASG 100 and ASG 140.
Autosequences Another class of output signals is autosequences. Two general categories are available. Industry standard CCITT 0.33 sequences consist of a 1 second identifying FSK preamble followed by a series of tones with specific durations and levels. Six different sequences are produced, each with unique tones and levels. Furthermore, certain sequences are intended for monophonic applications while others are intended for stereo situations. These autosequences are powerful because certain
advanced audio analyzers, such as the Tektronix VM 700A, automatically initiate an extensive series of tests each time the identifying preamble is detected. Thus automatic, yet unattended testing schemes are very easily implemented. Tektronix autosequences are similar to those defined by the CCITT specification. 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. VOICE may be appended to the beginning of each of these signals to aid source identification. Table 2 lists examples of both a CCITT and a Tektronix autosequence.
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MTone1 59 Hz 117 187 246 293 375 422 949 1184 1512 1887 2391 3000 3785 4758 6012 7570 9539 12012 15000
MTone2 23 Hz 94 141 223 270 352 562 879 1113 1395 1758 2227 2789 3516 4430 5590 7043 8871 11180 14074 17742 19992
MTone3 47 Hz 141 281 656 1031 2016 4031 8109 1500
MTone4 23 Hz 117 234 750 867 1758 3492 6984 13992 20016
Table 3. Multitone Test Signals.
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