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3-30
IM 701210-05E
3.12 Connecting Acceleration Sensors
An acceleration sensor is connected when measuring acceleration on the 701275
(ACCL/VOLT). For a details on acceleration sensors, see the respective manuals.
CAUTION
• Applying a voltage that exceeds the values indicated below to the 701275
(ACCL/VOLT) may damage the input section.
Maximum input voltage: 42 V (DC+ACpeak)
• When connecting acceleration sensors, do it without the bias current being
supplied to the sensor. Otherwise, damage to the internal circuitry of the
acceleration sensors may result.
• The DL750/DL750P only supports acceleration sensors that are driven by
constant current with driving current of 4mA and driving voltage of 22 V.
Connecting Acceleration Sensors
When Connecting Built-in Amplifier Type Acceleration Sensors
The DL750/DL750P 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 DL750/DL750P. Use either of
the following two methods to connect the sensors.
• Using the Charge Amplifier
Connect the charge output type acceleration sensor to a charge amplifier using a
highly isolated low-noise cable. The acceleration signal (charge signal) that has been
converted to a voltage signal by the charge amplifier is input to the DL750/DL750P
using a normal coaxial cable. The DL750/DL750P measures the signal in the voltage
measurement mode. The measured data can be converted to acceleration values
using the scale conversion function of the DL750/DL750P.
701275 (ACCL/VOLT)
(Voltage measurement)
Charge output type
acceleration sensor
Normal
coaxial cable
Highly isolated
low-noise cable
Charge amplifier
DL750/DL750P