Optimod-AM 9400 V1.2 Operating Manual - Orban

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4-6 MAINTENANCE ORBAN MODEL 9400 Field Audit of Performance Required Equipment: Ultra-low distortion sine-wave oscillator / THD analyzer / audio voltmeter (With verified residual distortion below 0.01%. Audio Precision System One, or similar high-performance system.) (The NAB Broadcast and Audio System Test CD is an excellent source of test signals when used with a high-quality CD player.) Spectrum analyzer with tracking generator (Stanford Research Systems SR760 or equivalent. Alternatively, a sweep generator with 50-9,500 Hz logarithmic sweep can be used with an oscilloscope in X / Y mode, or you can use a computer-controlled test set like the Audio Precision System One. ) Digital voltmeter Accurate to ±0.1%. Oscilloscope DC-coupled, triggered sweep, with 5M Hz or greater vertical bandwidth. Two 620 ±5% resistors. Optional: Audio Precision System 1 (without digital option) or System 2 (for digital tests). It is assumed that the technician is thoroughly familiar with the operation of this equipment. This procedure is useful for detecting and diagnosing problems with the 9400's performance. It includes checks of frequency response, noise and distortion performance, and output level capability. This performance audit assesses the performance of the analog-to-digital and digital-to-analog converters and verifies that the digital signal processing section (DSP) is passing signal correctly. Ordinarily, there is a high probability that the DSP is performing the dynamic signal processing correctly. There is therefore no need to measure such things as attack and release times — these are defined by software and will automatically be correct if the DSP is otherwise operating normally. It is often more convenient to make measurements on the bench away from high RF fields which could affect results. For example, in a high RF field it is very difficult to accurately measure the very low THD produced by a properly operating 9400 at most frequencies. However, in an emergency it is usually possible to detect many of the more severe faults that could develop in the 9400 circuitry even in high-RF environments.
OPTIMOD-AM DIGITAL MAINTENANCE 4-7 See the assembly drawings in Section 6 for component locations. Be sure to turn the power off before removing or installing circuit boards. Follow these instructions in order without skipping steps. Note: To obtain an unbalanced output, jumper pin 1 (ground) to pin 3, and measure between pin 1 (ground) and pin 2 (hot). Note: All analog output measurements are taken with a 620 ±5% resistor tied between pin 2 and 3 of the XLR connector. 1. Prepare the unit. A) Set the GND LIFT switch to the earth ground symbol setting (left position) to connect chassis ground to circuit ground. B) Use the front panel controls to set the 9400's software controls to their default settings, as follows: a) Navigate to SETUP > IO CALIB > ANLG IN CALIB. After writing down the old settings (so you can restore them later), set controls as follows: Input ............................................................................................. analog AI Ref VU ................................................................................... +4.0 dBu R CH BAL.........................................................................................0.0 dB b) Navigate to SETUP > IO CALIB > DIG IN CALIB. Set controls as in the table below: DI Ref VU ................................................................................ –15.0 dBFS R CH BAL.........................................................................................0.0 dB c) Navigate to SETUP > IO CALIB > ANLG OUT CALIB. Set controls as follows: AO #1 100% ............................................................................ +10.0 dBu AO #1 OUTPUT......................................................................Analog AM AO #2 100% ............................................................................ +10.0 dBu AO #2 OUTPUT......................................................................Analog AM d) Navigate to SETUP > IO CALIB > DIG OUT CALIB. Set controls as follows, using the NEXT button to access controls as necessary.: DO #1 100% ............................................................................. –2.8 dBFS DO #1 RATE...................................................................................32 kHz DO #1 SYNC.................................................................................internal DO #1 Word Len .................................................................................. 20 DO #1 Dither ......................................................................................Out DO #1 FORMAT................................................................................AES3 DO #2 100% ............................................................................. –2.8 dBFS DO #2 RATE...................................................................................32 kHz DO #2 SYNC.................................................................................internal DO #2 Word Len .................................................................................. 20 DO #2 Dither ......................................................................................Out
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Operating Manual OPTIMOD-AM 9400 Di
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IMPORTANT SAFETY INSTRUCTIONS All t
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Manual PLEASE READ BEFORE PROCEEDIN
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Operating Manual OPTIMOD-AM 9400 Di
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Headphones ........................
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Gain Reduction Metering ...........
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SPECIFICATIONS ....................
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OPTIMOD-AM DIGITAL INTRODUCTION 1-1
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Optimod-AM 9400 V1.2 Operating Manual - Orban

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