NTi Audio Minilyzer ML1 - Manual (Page 19)

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actual range or the up/down keys to increase or decrease the
range (sensitivity) of the bargraph scale.
• Press enter to confirm your setting.
display filter: see Display Mode
NOTES • For balanced input levels higher than +20 dBu, the
ML1 Adapter -20dB may be applied. (for details see
Accessories).
• The LEVEL RMS function is also available in the
sWeep mode and in 1/3 rd oCT. rMs mode
Level Relativ
This function measures the input RMS level, relative to a user-defined
reference level.
Measurement Functions
Fig 3.2 Level Relative Meter Panel
R eference Level
The reference level has to be
defined in the following way:
• Select the LEVEL REL
mode
• Apply the intended
reference level to a
ML1 input connector.
• Move the cursor to the
REF field below the main
result line and press the
enter key
This stores the applied level as the current reference level for all further
level relative measurements until a new reference level is set. The
level relative is indicated in dBr (dB relative) or %.
The level relative function may be used to measure the signal-to-noise
ratio (S/N) of a device under test (DUT) in the following manner:
• Set the unit of the level relative measurement to dBr.
• Connect the DUT output to the ML1 and mute the DUT output.
• Adjust the reference level to this signal as described above. By
this, the ‘noise’ signal of the DUT is acquired.
• Enable the DUT, thus applying the signal to the ML1. The resulting
level relative value reflects the S/N ratio in dB.