Dolby LM100 Broadcast Loudness Meter User's Manual

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Menus Table 4-2 Input Clipping Alarm Parameters (continued) Menu Item Controls Increment Range Analog Threshold RF Threshold The amplitude threshold for the alarm when the input is analog. 0.1 +22 to –20 dBr or dBu * The amplitude threshold for the alarm 0.1 +10 to –20 dBr when the input is RF. † * When the Analog Loudness Ref setting is not zero, the analog threshold is expressed in dBr. When the setting is zero, it is expressed in dBu. † Only on the LM100‐NTSC. RF Overmodulation This feature is available only on the LM100‐NTSC. Use the RF Overmodulation menu to enable or disable the overmodulation alarm for RF input signals. When enabled, any signal that modulates the aural carrier by more than 101 percent triggers the alarm. Digital Loudness Reference Use the Digital Loudness Ref menu to set the reference loudness level for digital input signals. This reference level is used by the over‐level and under‐level threshold alarms. When the measurement type is EBU R128, this value is automatically locked to –23 LUFS. When the measurement type is ITU‐R BS.1770‐2, this value is automatically locked to –24 LKFS. Analog Loudness Reference Use the Analog Loudness Ref menu to set the reference loudness level for analog input signals. This reference level is used by the over‐level and under‐level threshold alarms. Note: When the Analog Loudness Ref setting is not zero, measurement for the analog input is expressed in dBr. When the setting is zero, the measurement is expressed in dBu, reflecting that 0 dBu = 0.775 V RMS . RF Loudness Reference This feature is available only on the LM100‐NTSC. Use the RF Loudness Ref menu to set the reference loudness level for RF sources. This reference level is used by the over‐level and under‐level threshold alarms. Over Level The over‐level alarm is triggered when the input signal loudness level exceeds the chosen threshold relative to the selected digital or analog loudness reference level. 32 Dolby ® LM100 Broadcast Loudness Meter User’s Manual
The Main Setup Menu The Over Level menu allows you to set the parameters listed in Table 4‐3. Table 4-3 Over Level Alarm Parameters Menu Item Controls Range Alarm Enables or disables the alarm. Enabled/Disabled Threshold The loudness threshold for the alarm. The alarm triggers if 1 to 31 dB the measured loudness value exceeds the loudness reference plus the threshold for the duration specified in Time. Time The duration of the over‐level condition required to trigger 0 to 300 seconds the alarm. Under Level The under‐level alarm is triggered when the input signal loudness level falls below the chosen threshold relative to the selected digital or analog loudness reference level. This alarm is useful for identifying silence and/or near‐silent conditions. The Under Level menu allows you to set the parameters listed in Table 4‐4. Table 4-4 Under-Level Alarm Parameters Menu Item Controls Range Alarm Enables or disables the alarm. Enabled/Disabled Threshold The loudness threshold for the alarm. The alarm 1 to 31 dB triggers if the measured loudness value falls below the loudness reference minus the threshold for the duration specified in Time. Time The duration of the under‐level condition required 0 to 300 seconds to trigger the alarm. Table 4-5 Under-Level Alarm Parameters Menu Item Controls Range Alarm Enables or disables the alarm. Enabled/Disabled Threshold The loudness threshold for the alarm. The alarm 1 to 31 dB triggers if the measured loudness value falls below the loudness reference minus the threshold for the duration specified in Time. Time The duration of the under‐level condition required 0 to 300 seconds to trigger the alarm. dialnorm Threshold The dialnorm Threshold alarm is triggered when the measured loudness value of the input signal deviates from the dialnorm value already carried within the Dolby E or Dolby Digital input stream. This alarm is useful for identifying Dolby E and Dolby Digital bitstreams with incorrect dialogue level values. The dialnorm Threshold menu allows you to set the parameters listed in Table 4‐6. Table 4-6 dialnorm Threshold Alarm Parameters Menu Item Controls Range Alarm Enables or disables the alarm. Enabled/Disabled Dolby ® LM100 Broadcast Loudness Meter User’s Manual 33
Page 1 and 2: ® Dolby LM100 Broadcast Loudness M
Page 3 and 4: Regulatory Notices FCC NOTE: This e
Page 5 and 6: Fuses WARNING: Check that the corre
Page 7 and 8: Table of Contents Chapter 1: Introd
Page 9 and 10: List of Figures Figure 2-1 LM100-NT
Page 11 and 12: Chapter 1 Introduction This chapter
Page 13 and 14: Chapter 2 Getting Started This chap
Page 15 and 16: Getting Started Figure 2‐1 Analog
Page 17 and 18: Power 2.5 Power Warning: Before app
Page 19 and 20: Installing the Remote Software Use
Page 21: Installing the Remote Software Figu
Page 24 and 25: Front-Panel Controls incrementally.
Page 26 and 27: Front-Panel Controls Table 3-2 Erro
Page 28 and 29: Menus Figure 4‐1 Figure 4-1 Main
Page 30 and 31: Menus Figure 4‐8 Figure 4-8 Main
Page 32 and 33: Menus Figure 4‐10 Figure 4-10 Mai
Page 34 and 35: Menus If EBUis the selected measure
Page 36 and 37: Menus conditions are a loss of inpu
Page 38 and 39: Menus Short-Term Window Length When
Page 40 and 41: Menus Analog Input Calibration Use
Page 44 and 45: Menus Table 4-6 dialnorm Threshold
Page 46 and 47: Menus To recall a preset follow the
Page 48 and 49: Menus Remote Mode When you select R
Page 50 and 51: Features • The main status screen
Page 52 and 53: Features Figure 5‐1 Figure 5-1 Li
Page 54 and 55: Features Figure 5‐2 :20 :19 :18 :
Page 56 and 57: Features The other selections are a
Page 58 and 59: Features In the System Log menu, to
Page 61 and 62: Appendix LM100 Specifications Core

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