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3.11 Connecting an Acceleration Sensor
An acceleration sensor is connected when measuring acceleration on the 701275 (ACCL/VOLT). For a
details on acceleration sensors, see the respective manuals.
WARNING
Over-Range Indication
If over-range is indicated, the DL850/DL850V may be receiving a voltage higher than the
observed waveform or measured waveform values. To prevent electric shock, change the
vertical scale with the SCALE knob so that the entire amplitude of the waveform is displayed
within the waveform display area, and check the input voltage level.
Over-range indication
Indicates the number of the channel that over-range is occurring on.
Channel indication when over-range is occurring on multiple channels
Indicates the smallest number among the channels that over-range is
occurring on.
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 DL850/DL850V only supports acceleration sensors that are driven by constant current
with driving current of 4 mA and driving voltage of 22 V.
Connecting Acceleration Sensors
When Connecting Built-in Amplifier Type Acceleration Sensors
The DL850/DL850V 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 DL850/DL850V. 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 DL850/DL850V using a normal coaxial cable. The
DL850/DL850V measures the signal in the voltage measurement mode. The measured data can be
converted to acceleration values using the scale conversion function of the DL850/DL850V.
701275(ACCL/VOLT)
(voltage measurement)
Charge-output-type
acceleration sensor
Normal coaxial
cable
High-insulation,
low-noise cable
Charge amp
DL850/DL850V
3-30
IM DL850-03EN