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2.4 Connection of the Input Unit
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2.4.5 8947 CHARGE UNIT
WARNING
Never connect the connection cable to the unit while it is connected
to the measurement object, to avoid electric shock.
The BNC connectors for each channel and the miniature connection
terminals share a common ground. Do not connect both types of
terminals at the same time.
When the PREAMP measurement mode is selected, voltage (15 V at
2 mA) is applied internally to the BNC connector when measurement
starts. To avoid electric shock and damage to measurement objects,
select a measurement mode other than PREAMP or turn the unit off
when connecting a sensor or probe to the BNC terminals.
Before using an Internal Preamp Type Acceleration Sensor, be sure
that it conforms to the 8947 specifications (15 V at 2 mA). Using a
non-conforming sensor could result in damage to the sensor.
Acceleration sensors compatible with the 8947 are as follows:
Acceleration sensors with internal preamp (BNC connector with 15 V at 2
mA operating power)
Charge-output type accelerator sensors (miniature 10-32 connection terminal)
Connecting an Internal Preamp Type Acceleration Sensor (PREAMP and
VOLTAGE modes)
Use a cable with BNC connector to connect the pickup sensor to the unit in
PREAMP mode. We recommend the Model 9198 CONNECTION CORD for
the VOLTAGE mode.
1. Align the BNC connector with the guide groove of the 8841/42 input
connector, and turn clockwise while pressing in to lock the connector.
2. To remove from the unit, turn the BNC connector counterclockwise to
release the lock, then pull it.
Connecting a Charge-Output Type Acceleration Sensor (CHARGE mode)
Use a cable with a plug to mate with the miniature connector to connect the
pickup sensor to the unit in CHARGE mode (10-32 miniature connection
terminal).
1. Insert the miniature connector plug into the miniature connector on the
unit, and turn it clockwise until tight.
2. To remove the miniature connector, turn the plug counterclockwise.
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