Digilyzer DL1 User Manual

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Measurement Functions • The sweep recording will be stopped when as soon as an input signal with a lower frequency occurs or manually by the enter key pressed again (cursor on the flashing REC field). • In order to analyze the sampled curve more detailed activate the arrow mode by placing the cursor to the corresponding symbol. Press the enter key and move the arrow to the sample(s) of interest by using the left / right keys. • To zoom in/out the Y-axis move the cursor to the zoom mode field, press enter and use the left / right keys. • To scroll through the Y-axis move the cursor to the zoom mode field, press enter and use the up / down keys. The last recorded sweep curve will be stored internally, even after leaving the sweep mode or switching off the <strong>Digilyzer</strong>. As soon as the frequency sweep mode is re-entered, the curve will re-appear on the graph until a new frequency sweep is started. NOTE The auto power off is disabled during a frequency sweep recording. Test signal: The sweep measurement can be carried out by using the sweep signal produced by the Minirator MR1, the "NTi Audio Wavefile Generator" software or other external sweeps with the following pre-conditions: • Signal type: Stepped sweep • Step time: min. 1 second / step • Frequency step: min. 1% increase • Max. number of steps: 160 • Start frequency: 20 Hz 46
THd+N The THD+N function (Total Harmonic Distortion+Noise) calculates the deviation of the input signal from an ideal sine wave. This measurement is most important to check and qualify analog/digital converters. Full scale indication Filter Measurement Functions Fundamental frequency Fig 5-50, THD + N screen The <strong>Digilyzer</strong> is able to calculate THD+N values down to –100dB (0.001%). For better THD+N values “< -100 dB“ (< 0.001%) are displayed. THd+N results of the selected channel may be displayed in dB or %. Full scale indication appears whenever one sample reaches full scale. This indication is independent of the clipping of the PPM meter. Filter: The audio signal decoded from the digital audio stream can be filtered with the following filters prior to the RMS or THD+N calculations: • HP400, highpass 400 has a good rejection in the area of main frequencies – so hum problems may easily be examined and localized. The HP400 is also used to measure quantization noise. • 22-22k, bandpass 22-22k is used to define the commonly used measurement bandwidth from 22Hz to 22kHz. 47 Level RMS THD+N result Display mode
Page 1 and 2: Digilyzer DL1 User Manual
Page 3 and 4: INdex: 1. In t r o d u c t Io n 4 C
Page 5 and 6: egistration Introduction Register a
Page 7 and 8: Warnings In order to avoid any prob
Page 9 and 10: Functions Overview The Digilyzer fe
Page 11 and 12: • Some functions, e.g. SCOPE, are
Page 13 and 14: Connectors The Digilyzer includes t
Page 15 and 16: 3. FIrsT sTeps This chapter is a qu
Page 17 and 18: 8. Change auto power off time - Mov
Page 19 and 20: Menu Bar The menu bar allows the us
Page 21 and 22: setup screen Basic Operation The se
Page 23 and 24: display Basics Debugging and analyz
Page 25 and 26: Following errors are analyzed/visua
Page 27 and 28: 5. MeAsureMeNT FuNCTIoNs Channel St
Page 29 and 30: Row number Measurement Functions Pa
Page 31 and 32: Consistency Check The consistency c
Page 33 and 34: Bit statistic The bit statistic fun
Page 35 and 36: Logger The event logger records any
Page 37 and 38: Displaying events The display of th
Page 39 and 40: vu+ppM The Digilyzer offers a combi
Page 41 and 42: Level Measurement The Level menu fe
Page 43 and 44: Level RMS The analog Level RMS func
Page 45: Level Sweep The Digilyzer supports
Page 49 and 50: scope The scope shows the waveform
Page 51 and 52: 7. ACCessorIes MiniLINK MiniLINK al
Page 53 and 54: 8. AppeNdIx 1C2f Format The AES3 st
Page 55 and 56: Logger Event Coding The following c
Page 57 and 58: DL1 event Cs WordLeN Cs CHACHB Cs o
Page 59 and 60: Byte Bit Bit-info Digilyzer Explana
Page 61 and 62: Appendix Consumer Format Coding Ove
Page 63 and 64: Appendix Byte Bit Bit-info Digilyze
Page 65 and 66: Dimensions (L x W x H) 163 x 86 x 4

Digilyzer DL1 User Manual

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