YOKOGAWA DL850E User Manual page 92

Connecting Acceleration Sensors
When Connecting Built-in Amplifier Type Acceleration Sensors
The DL850E/DL850EV allows built-in amplifier type (low impedance) acceleration sensors to be
directly connected. To connect built-in amplifier type acceleration sensors, use BNC cables. Use
cables that are appropriate for the acceleration sensors being used.
Connect the acceleration sensors with the bias current turned off. After connection, turn on the supply
current to the acceleration sensors for making measurements.
When Connecting Charge Output Type Acceleration Sensors
Since the charge output type (high impedance) acceleration sensors do not have built-in amplifier
circuit, they cannot be directly connected to the DL850E/DL850EV. Use either of the following two
methods to connect the sensors.
Using the Charge Amplifier
Connect a charge-output-type acceleration sensor to the charge amplifier using a high-insulation,
low-noise cable. The acceleration signal (charge signal) that has been converted to a voltage signal
by the charge amplifier is input to the DL850E/DL850EV using a normal coaxial cable. The DL850E/
DL850EV measures the signal in the voltage measurement mode. The measured data can be
converted to acceleration values using the scale conversion function of the DL850E/DL850EV.
Charge-output-type
acceleration sensor
When using the charge converter
Connect a charge-output-type acceleration sensor to the charge converter using a high-insulation,
low-noise cable. By driving the charge converter using a constant current from the DL850E/DL850EV,
voltage signals similar to those of the built-in amplifier type acceleration sensor can be obtained. The
DL850E/DL850EV measures the signals in the acceleration measurement mode and supplies bias
current to the charge converter. Set the input sensitivity of the DL850E/DL850EV according to the
charge converter gain and the sensitivity of the charge output type acceleration sensor.
The DL850E/DL850EV only supports charge converters that are driven by constant current with
driving current of 4 mA and driving voltage of 22 V.
Charge-output-type
acceleration sensor
Note
The unit of measu
mV/G for the acceleration sensor that you are using, convert it to m/s
IM DL850E-03EN
High-insulation,
low-noise cable
Charge amp
High-insulation,
Normal coaxial
low-noise cable
Charge
converter
r
ement of acceleration on the DL850E/DL850EV is m/s
3.11 Connecting an Acceleration Sensor
DL850E/DL850EV
Normal coaxial
cable
701275 (ACCL/VOLT)
(voltage measurement)
DL850E/DL850EV
cable
701275 (ACCL/VOLT)
(acceleration measurement)
2
. If the sensitivity is indicated in
2 . (1 G = 9.81 m/s
1
2
3
4
5
6
App
Index
2 )
3-43