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
Summary of Contents for DA-21
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