Specifications

Reference Manual

MHM-97408, Rev. 2

June 2008

CSI 9420

A-2

Accuracy

Measurement Precision

• Vibration: +/- 0.2 dB over 24 months (corresponds to +/- 2%)

• Temperature: +/- 2 °C over 24 months.

NOTES:

1. Measurement accuracy is the absolute accuracy of the measurement

relative to a known, calibrated excitation.

2. Typical measurement accuracy represents the expected performance

operating under steady-state conditions (constant temperature at 20

°C with no external interference) for a mid-band excitation (nominally

1 g at 100 Hz). This variation includes the frequency response of the

electronics and the sensor.

3. Worst case measurement accuracy represents the worst-case

performance over the entire temperature range, across all

frequencies and amplitudes, and in the presence of high-intensity

transient EMI.

Frequency response variability:

RMS velocity:

• +/- 0.4 dB from 5 Hz to 1000 Hz

• +/- 2.0 dB from 2 Hz to 1000 Hz.

PeakVue:

• +/- 0.4 dB from 2500 Hz to 20 kHz

• +/- 1.0 dB from 1 kHz to 25 kHz.

Temperature:

• +/- 4° C.

Sensor variability:

• Temperature coefficient: 0.1% per °F; 0.18% per °C (+/-

1.4 dB)

• EMI/transient susceptibility (2.4 GHz only): +/- 1.4 dB

under worst-case interference(per EN 61326).

4. Measurement precision refers to the variability of the same

measurement in a fixed operating environment under steady-state

conditions. This value was obtained with statistical measurements

with 1 g-peak input excitation at a frequency of 100 Hz.

Parameter Typical

Worst Case

RMS Velocity +/- 0.4 dB (corresponds to +/-4%) +/- 4.8 dB

PeakVue +/- 0.4 dB (corresponds to +/-4%) +/- 3.8 dB

Temperature +/- 4

C +/- 10