Minilyzer ML1 User Manual - NTi Audio

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Measurement Functions vu + PPM <strong>ML1</strong> provides vu + PPM (Peak Program Meter) measurement results, following IEC60268. Reference Level Numerical Peak-Hold Graphical Peak-Hold Integration Time Reference Indicator Fig 3.11 vu + PPM (Type I) Panel The PPM may be measured according to three standards: • Type I • Type IIA • Nordic standard One of these standards has to be selected when entering the vu+PPM mode through the measurement functions menu. The following chapters describe the different entry fields and indicators of the vu+PPM display. a. Reference Level & Indicator The reference level indicates the RMS level of a 1 kHz sine wave that defines the value of the reference indicator. The reference level may be defined by the user in a range of -20 dBu to +14 dBu. The default reference level depends on the selected standard • +4 dBu for the vu-meter • +6 dBu for the PPM standards Type I and Nordic • +8 dBu for the PPM standard Type IIA. 28
Measurement Functions The following examples explain the correlation between the reference level and the reference indicator. Example 1 Given vu-meter reference level set to +4 dBu Input signal = steady-state sine wave of +4 dBu Result vu meter level = 0 (reference indicator level) Example 2 Given vu-meter reference level set to 0 dBu Input signal = steady-state sine wave of +4 dBu Result vu-meter level = +4 (+4 dB above reference indicator) Example 3 Given PPM Nordic standard, reference level set to +12 dBu Input signal = steady-state sine wave of +6 dBu Result PPM level = TST (-6 dBu below reference indicator level) b. Peak Hold There are two different types of peak hold on the vu+PPM screen: • Two numerical peak hold indications, located above the right hand end of the vu and the PPM bargraph. The numerical peak hold indicates the all-time max. input level since the vu+PPM mode has been entered. It may be reset by placing the cursor to it and pressing the return key. To reset the two numerical peak-hold simultaneously, simply re-enter the vu+PPM mode. • Two graphical peak hold indications, represented by a vertical line in each bargraph. The graphical peak hold display has a decay time of approximately one second. c. Integration Time The PPM display provides an additional entry field to select the attack and release times between NRM (normal) and FAST. • In the NRM mode, the value of the integration time is given by the corresponding standard (Type I: 5 ms; Type IIA: 10 ms; Nordic: 5 ms) • In the FAST mode, the integration time is 1 ms for all standards. 29
Page 1 and 2: Minilyzer ML1 User Manual
Page 3 and 4: Table of Contents: 1. In t r o d u
Page 5 and 6: Introduction Registration Register
Page 7 and 8: Introduction Warnings In order to a
Page 9 and 10: Battery Replacement Introduction Af
Page 11 and 12: Basic Operation Power ON/OFF - Back
Page 13 and 14: Basic Operation Menu Bar The menu b
Page 15 and 16: Basic Operation c. Setup The setup
Page 17 and 18: Basic Operation Inputs and Monitor
Page 19 and 20: Measurement Functions actual range
Page 21 and 22: Measurement Functions Start of meas
Page 23 and 24: Measurement Functions By exceeding
Page 25 and 26: c. Calibration Panel Measurement Fu
Page 27: Measurement Functions THD+N In this
Page 31 and 32: An overrange indicator appears for
Page 33 and 34: Measurement Functions Sweep ML1 sup
Page 35 and 36: Measurement Functions b. Time Sweep
Page 37 and 38: 1/3 rd Octave RMS Measurement Funct
Page 39 and 40: Measurement Functions To enter the
Page 41 and 42: Induction Loop Mode 4. Induction Lo
Page 43 and 44: Induction Loop Mode Calibration An
Page 45 and 46: Measurement Functions FSweep Freque
Page 47 and 48: Accessories 6. Accessories MiniSPL
Page 49 and 50: 7. Technical Specification Technica
Page 51 and 52: Technical Specification Technical D
Page 53: Quick Guide Minilyzer ML1 Menu Bar

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