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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 2.4. Display Mode

NOTES • For balanced input levels higher than +20 dBu, the

ML1 Adapter -20dB may be applied. (for details see

5. Accessories).

• The LEVEL RMS function is also available in the SWEEP

mode (see 3.8) and in 1/3

OCT. RMS mode (see 3.9).

3.23.2

3.2

Level RelativLevel Relativ

Level Relativ

This function measures the input RMS level, relative to a user-defined

reference level (Fig 11).

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.

Measurement Functions

3-02

3.33.3

3.3

Sound Pressure LevelSound Pressure Level

Sound Pressure Level

In the LEVEL SPL mode the Minilyzer measures the integrated-averaging

level over time, the actual, minimum and maximum sound pressure level.

NOTES • For this function a self powered microphone is

required. NTI does recommend to use the accessory

MiniSPL (for details see 5. Accessories).

• Prior the first measurement the Minilyzer has to be

calibrated to the microphone specifications. As

default the ML1 is calibrated according the MiniSPL.

• No phantom power is available on the XLR-input.

a. Sound Pressure Level Panela. Sound Pressure Level Panel

a. Sound Pressure Level Panel

To enter the LEVEL SPL mode (Fig 12), select LEVEL -> SPL in the

measurement functions submenu.

Start of measurement: The sound pressure level measurement is re-

started every time

• The LEVEL SPL screen is entered

• The filter selection is changed.

• The clock is reset.

• The time weighting selection is changed.

• The bargraph range selection (RNGE) is changed.

Measurement Functions

3-03

Fig 12 Sound Pressure Level Panel

Fig 11 Level Relative Meter Panel