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SVAN 971 User Manual
– Appendixes
166
Note: For the signals with the crest factor n > 1.41 upper measuring 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 A10 = 120 dB.
Measuring frequency range
10
Hz ÷ 22.4 kHz with the
Z
filter (-3 dB)
Maximum peak voltage
20 V Peak-Peak (Maximum peak voltage of input sinusoidal
signal, which can be lead 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
114dB
•
Reference temperature
+20°C
•
Reference relative humidity
65 %
Calibration (electrical)
Calibration level
0.5 V
RMS
Basic accuracy
<
0.2
dB (for the temperature T=+23°C
5°C for sinusoidal
signal 120 dB
RMS
in the band 10
Hz ÷ 20 kHz with the
HP
input
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 120 dB
RMS
in the band 10
Hz ÷
20 kHz with the
Z
input 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 40
C 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
).
2
log
20
137
n
A
n
Содержание SVAN 971
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Страница 169: ...SVAN 971 User Manual Appendixes 169 2 0 kHz 1 1 octave filter 1 0 kHz 1 1 octave filter 500 Hz 1 1 octave filter ...
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Страница 177: ...SVAN 971 User Manual Appendixes 177 B filter Class 1 according to the IEC 651 B filter characteristics ...
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