Manual

3.53.5

3.5

vu + PPMvu + PPM

vu + PPM

ML1 provides vu + PPM (Peak Program Meter) measurement results,

following IEC60268.

Fig 17 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.a.

Reference Level & IndicatorReference Level & Indicator

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.

Measurement Functions

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3.43.4

3.4

THD+NTHD+N

THD+N

In this mode the Minilyzer measures the THD+N (Total Harmonic Distortion

+ Noise).

The measurement is carried out in the band from 10 Hz - 20 kHz,

expressed in dB or in %. Simultaneously, the LCD shows the actual RMS

input level below the THD+N result.

NOTE The THD+N results are calculated using a restricted

measuring bandwidth of 10 Hz - 20 kHz.

Besides checking the linear purity of a sine signal - e.g. measuring amount

of harmonic distortions - this measurement mode is particularly suited

to get a quick idea whether unwanted disturbances like hum are present.

Measurement Functions

Fig 16 THD+N Meter Panel

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