Note: For the signals with the crest factor n >1.41 upper measurement range of the RMS is reduced.
The valid upper limit can be calculated according to the below given formula:
, where A is the upper limit for the sinusoidal signal
Example: For the crest factor n = 10 the upper limit is A
10
= 120 dB
Measurement frequency range with the HP filter (-3 dB) 0.4 Hz ÷ 22.4 kHz.
Maximum peak voltage 30 V Peak-Peak (Maximum peak voltage of input sinusoidal
signal, which can be applied to the SLM without destruction the
meter)
RMS detector
• Digital “True RMS“ with Peak detection
• Resolution 0.1 dB
• Range 327.7 dB
• Crest Factor unlimited (for signals in 20 kHz band)
Reference conditions
• Reference frequency 1000 Hz
• Reference level 114 dB
• Reference temperature +20°C
• Reference relative humidity 65%
Calibration (electrical)
Calibration level 114.0 dB (re 1μV
RMS
)
Basic accuracy < 0.2 dB (for the temperature T=+23°C 5°C for sinusoidal
signal 1 V
RMS
in the band 10 Hz ÷ 20 kHz with Z filter)
Measurement error in the full temperature range
< 0.1 dB (when the temperature is from -10°C to +50°C for the
sinusoidal signal 1 V
RMS
in the band 10 Hz ÷ 20 kHz with Z filter)
Overload detector
The instrument has the built-in overload detectors. The overload in the measurement channel (in its analogue
part) and the overload of the analogue / digital converter are both detected. The “overload” indication is when
the input signal amplitude is 0.5 dB above the declared “Peak measurement range”
Warm-up time 1 min. (for 0.1 dB accuracy).
Effect of humidity < 0.5 dB (for 30%<RH<90% at 40C re Reference conditions)
Effect of magnetic field < 15 dB (A) or < 25 dB (Z) (for 80 A/m and 50 Hz)
Effect of Vibration < 0.1 dB (from 20 Hz to 1000 Hz at 1 m/s
2
)
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