EAW Resolution Specifikace Strana 58
- Strana / 114
- Tabulka s obsahem
- ŘEŠENÍ PROBLÉMŮ
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
EAW Smaart 6 Operation Manual Analysis Modes and Display Types
58
The default Full Scale internal display calibration shows all magnitude values in terms
of dB down from the maximum input level of 0 dB. The Signal Level/SPL Readout
above the input level meters always shows a negative value and dB Full Scale appears
in the field immediately above the numeric readout. When Smaart 6 is calibrated to
SPL, this notation changes to SPL, and the dB value is normally positive.
To obtain accurate SPL readings in Smaart 6, the RTA display must be recalibrated to
an external reference. The signal level readout tracks the input assigned as the SPL
Source in the Audio I/O tab of the Options dialog. It should normally be targeted to the
input channel carrying a signal from a microphone when measuring SPL.
Preferred SPL Calibration Method
The most accurate way to calibrate Smaart 6 to SPL requires an acoustic or piston-
phone sound level calibrator. The calibrator must be fitted to the capsule of the mea-
surement microphone with an airtight seal.
NOTE: If the calibrator doesn’t come with an adaptor that fits your microphone snugly,
check with the calibrator and/or microphone manufacturer. The calibrator
manufacturer may offer additional adapter sizes not included with the base
unit or you may be able to purchase an adapter collar from the microphone
manufacturer that will fit the microphone to a standard calibrator cup size.
1. Select the RTA display to perform the recalibration procedure and click the
Start button.
2. Set the RTA display to a fractional octave frequency resolution.
3. Set the gain of the microphone preamp and sound card input controls to a useful
level then insert your microphone into the calibrator and turn it on.
4. When the peak on the RTA display stabilizes at the calibrator frequency, click
the Options/Units button above the Signal Level/SPL Readout to open the SPL/
Calibrations Options dialog and select Calibrate Using Peak.
Smaart 6 automatically finds the magnitude of the highest peak on the RTA
plot. The Amplitude Calibration dialog appears with the magnitude of the
peak frequency.
- USER GUIDE 1
- Table of Contents 3
- List of Figures 7
- Chapter 1: Getting Started 9
- 1.1.2 Measurement Microphone 11
- 1.1.3 Microphone Preamplifier 11
- 1.2.1 First Time Installation 12
- 1.3 Smaart 6 Signal I/O 14
- 1.4.1 The Menu Bar 17
- 1.4.2 The Plot Area 17
- 1.4.3 Cursor Readout 17
- 1.4.4 Start/Stop Buttons 17
- 1.4.6 Display Controls 18
- 1.4.8 Signal Generator 19
- 1.4.9 Internal Delay Control 20
- 1.5 How to use this Manual 21
- 2.1 Concepts 23
- 2.1.2 Fast Fourier Transform 24
- 2.1.3 Averaging 25
- 2.1.4 Sampling Rate 25
- 2.1.5 Frequency Resolution 26
- 2.1.6 Pink and White Noise 27
- 2.1.7 Data Window Functions 28
- 2.1.8 Impulse Response 29
- 2.1.9 The Transfer Function 29
- 2.1.10 Coherence 30
- 2.1.11 Signal Alignment 30
- 2.2 Glossary of Terms 31
- 2.3 Selected Bibliography 34
- 3.1 Spectrum Measurements 38
- 3.1.2 Spectrograph 40
- 3.2.3 The Magnitude Display 45
- 3.2.4 The Phase Display 46
- 3.2.5 Time Windowing 46
- 3.2.6 Averaging and Smoothing 47
- 3.2.8 Magnitude Thresholding 51
- 3.3.3 Automatic Delay Locator 55
- 3.4 SPL Measurements 56
- 3.4.2 Calibrating to SPL 57
- Figure 3-14 Legend dialog 61
- 3.6 Internal Delay 63
- 3.7 Internal Signal Generator 63
- 3.8 Weighting Curves 65
- 3.9 External Device Control 66
- 3.10 The Locked Cursor 68
- 3.11 Smaart 6 Screen Capture 69
- Chapter 4: Applications 71
- Measurement Signal 75
- Reference Signal 75
- Computer 75
- Line Out 75
- Equalizer 75
- 4.3 Measuring a Loudspeaker 77
- 4.3.1 Adjust Signal Levels 78
- Step 1: Evaluation Listening 85
- Step 4: Compare Positions 86
- Step 6: Critical listening 86
- Step 7: Stability Testing 87
- Chapter 5: Smaart 6 Commands 91
- 5.3 Options Menu 93
- 5.3.2 Frequency Response 95
- 5.3.3 IR Analysis 97
- 5.3.4 Audio I/O 98
- 5.3.5 Delay 99
- 5.3.6 Zoom 101
- 5.3.7 Instantaneous 101
- 5.4 Help Menu 102
- 5.5 Keyboard Shortcuts 103
- External Device Control 104
- Options Menu Shortcuts 104
- Chapter 6: Troubleshooting 105
- 6.3 Sound Hardware Problems 107
- 6.4 Performance Issues 108
- 6.5 Font and Display Problems 108
- EAW Smaart 6 Operation Manual 111
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