Overload detector
The instrument has the built-in overload detectors. Both A/D converter and input amplifier overload conditions
are detected. The overload in the measurement channel (in its analogue part) and the overload of the
analogue / digital converter are both detected. The “overload” indication appears when the input signal
amplitude is 0.5 dB above the declared “Peak measurement range”.
Underrange detector
The instrument has the built-in underrange detector. The “underrange” indication appears when the minimum
value of the RMS detector output goes below the specified lower linear operating range.
Analogue / Digital conversion 24 bits resolution
Sampling frequency 48 kHz (internal only)
Antialiasing filters
Built-in antialiasing filter ensuring correct sampling of the measured signal.
Pass band (-1 dB): 22.4 kHz
Stop band 27.1 kHz
Attenuation in the stop band > 70 dB
Reference conditions
• Reference temperature (DIN 45669) +23°C
• Reference relative humidity (DIN 45669) 40 %
• Reference range 170 dB
Pre-heating time 1 minute (for 0.1 dB accuracy)
Typical stabilisation time after he change in environmental conditions is 1 minute.
Note: When the instruments are moved from a warm environment with high humidity,
to a colder environment, care should be taken not to produce condensation inside the
instruments. In this case, much longer stabilisation periods may be necessary.
Noise levels
Typical noise levels from the combination of the vibration transducer and the VLM for the frequency-weighted
response:
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