The VM700T Option 40 Audio Measurement Set expands the power of the VM700T Option 01 NTSC or Option 11 PAL Video Measurement Set to include comprehensive audio measurement capabilities. This option incorporates both automated and manual audio measurements, audio spectral analysis, multitone analysis and stereo audio monitoring into the full set of video measurements of the VM700T. There are a total of 4 multitone signals available.
With this module, the VM700T can continuously monitor your audio lines for the presence of a test sequence designed for automated testing. The sequence of test tones begins with a one second FSK signal which identifies the source of the test signals, indicates which stored measurement program is to be used and instructs the VM700T to begin measurements. The remainder of the sequence consists of a number of test tones at defined levels and frequencies, each tone typically being one second in duration. This sequence is inserted in the audio line by the Tektronix ASG100 or other device capable of creating a compatible sequence.
Testing to the ANSI standard T1.502-1988, EIA/TIA-250-C or CCITT 0.33 is accomplished through stored measurement programs. The CCITT 0.33 recommendation specifies tone sequence parameters necessary for rapidly measuring stereophonic pairs and monaural sound program circuits, links and connections. FSK tones unique to each sequence type prompt the Option 40 Audio Measurement Set to perform the appropriate measurement.
- Incorporates Both Automated and Manual Audio Measurements
- Audio Spectral Analysis
- Multitone Analysis
- Stereo Audio Monitoring
- CCIT 0.33 Measurement Sequences
Note: Option 41 adds three stereo audio inputs to the VM700T. This provides the capability to measure the audio signals from three stereo audio sources via separate inputs. Option 41 operates like Audio Option 40, but with some minor differences. Unlike Option 40, Option 41 allows specification of an individual audio channel (1, 2 or 3) to a video source (A, B or C). Selection of the three audio channels then follows selection of the video source from the VM700T keypad. The VM700T with Option 41 utilizes a male DB-37 connector located on the instrument back panel for signal input as opposed to the mini-XLRs used by Option 40. This allows input of up to 3 balanced line stereo pairs.
Multitone, Audio Analyzer, Audio Spectrum Analyzer, Audio Monitor and View Audio Auto Test all work the same under Option 41. The only difference is that the audio channel to be measured is specified in the Source Selection Audio File. Because the audio source selection is internal to the VM700T, Option 41 is ideal for measuring outputs from devices with more than one audio pair out, such as production VCRs and audio distribution amplifiers.