Rion DA-21, Инструкция по эксплуатации

Страница: 80 / 172

68
Preparations
The table below shows the correlation formula for the original input range
X [V] and the condition after the sensitivity setting.
Unit
Sensitivity
value
Inp (Sens) type Input range value after conversion
[V] None DC/AC(---)
X
[V]
[EU]
K
[V/EU] DC/AC(EU)
X
/
K
[dB]
S
[dBV/Pa] MIC(CCLD) 94-
S
-3+20 log
10
(
X
)
[m/s 2 ]
V
[mV/(m/s 2 )] PICK(CCLD)
1/(V/1000)×
X
V
[pC/(m/s 2 )]* PICK(VP4x)
[dB]
R
[dB] SLM/VM 20 log
10
(
X
)+
R
-10
* Take the charge sensitivity [pC/(m/s 2 )] given in the calibration certificate
of the accelerometer and enter it as voltage sensitivity [mV/(m/s 2 )].
Some practical examples for applying the respective formula to actual
sensitivity values are shown below. These values are shown as input range.
(When the exponent is two digits, the mantissa is shown as one digit.
The effective number of digits for dB is three. In 3-V systems,
10
is
used instead of 3 for calculation. This is because the 3-V range actually
is 3.16 V =
10
.)
Sensor Sensitivity Unit Actually displayed input range value
General 1 V 10V 3V 1V 0.3V 0.1V 0.03V 0.01V
Tachometer
K
=1.0E-03 EU 1.00E+4 3.16E+3 1.00E+3 3.16E+2 1.00E+2 3.16E+1 1.00E+1
UC-59
S
=-28.8 dB 139.8dB 129.8dB 119.8dB 109.8dB 99.8dB 89.8dB 79.8dB
PV-90I
V
=0.44 m/s 2 2.27E+4 7.19E+3 2.27E+3 7.19E+2 2.27E+2 7.19E+1 2.27E+1
SLM
R
=80dB dB 90 80 70 60 50 40 30