Frequency range (for acceleration)
Frequency range for the acceleration measurement (± 3 dB): 0.2 Hz ÷ 3 700 Hz in the linear measurements
with the HP1 filter
Note: With the application of another vibration transducer, the frequency range given above
for the HP1 filter can be different (i.e. wider).
Basic error for the acceleration measurement < 0.5 dB
Pre-heating time 1 minute
Calibration
Direct: by measurement of the standard signal generated by the external vibration calibrator.
Indirect: by declaration of the transducer's sensitivity (according to the calibration chart).
Note: Calibration procedure is given in Chapter 3.3.3 of this Manual.
Accelerometer inputs
Connector 1 x LEMO 4-pins ENB.0B.304 CLM pin (for triaxial
accelerometer) and 1 x TNC for auxiliary transducer
Impedance (each channel) 40 k / 100 pF (typical)
Vibration transducers powering 28 V / 2.5 mA current source
Range of the measured voltage Lower level - filter depended (see below)
Upper level - 7.5 V
RMS
(137 dB related to 1 µV
RMS
or 177 dB
related to 1 µm/s
2
RMS
)
Maximum input voltage SVAN 958A is the instrument with the 2
nd
security class
according to the international standard IEC 348.
The input voltage should be within the interval from 0 V to 28 V.
RMS detector
• Digital “True RMS“ with Peak detection,
• Resolution 0.1 dB
• Range 327.7 dB
• Crest Factor > 100 (for signals in 20 kHz band).
• Time weighting filters: 100 ms, 125 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s and 10 s
PEAK and P–P detectors Digital with 0.1 dB sampling step
To Next Page
Loading...
