NTi Audio Minilyzer ML1 - Manual (Page 29)

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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.
Measurement Functions