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3-31
IM 701210-05E
Making Preparations for Measurements
3
• When using the charge converter
Connect the charge output type acceleration sensor to a charge converter using a
highly isolated low-noise cable. By driving the charge converter using a constant
current from the DL750/DL750P, voltage signals similar to those of the built-in
amplifier type acceleration sensor can be obtained. The DL750/DL750P measures
the signals in the acceleration measurement mode and supplies bias current to the
charge converter. Set the input sensitivity of the DL750/DL750P according to the
charge converter gain and the sensitivity of the charge output type acceleration
sensor.
The DL750/DL750P 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
Normal
coaxial cable
Highly isolated
low-noise cable
Charge
converter
701275 (ACCL/VOLT)
(Acceleration measurement)
DL750/DL750P
Note
The unit of measurement of acceleration on the DL750/DL750P is m/s
2
. The sensitivity is
sometimes expressed in units of mV/G depending on the acceleration sensor. In such case,
convert the unit.(1 G = 9.81 m/s
2
)
Precautions
• Do not apply shock outside the specifications (see the manual for the acceleration
sensor) to the acceleration sensors. Doing so can damage the sensors.
• Do not impose drastic temperature changes on the acceleration sensors.
Temperature changes may affect the output value of the acceleration sensors.
• By default, the bias current on the acceleration sensors is turned OFF. Be sure to
turn it ON before using the acceleration sensors. Bias current is valid only when
measuring acceleration. When measuring other parameters, it is automatically turned
OFF. The ON/OFF setting of the bias current is retained even when you turn OFF the
DL750/DL750P.
3.12 Connecting Acceleration Sensors