Kaman SMU9200 - Manual (Page 9)

SMU-9000 User Manual 6
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Part II: Setting Up the System
Power and Output Connections
The standard SMU-9000 power and output connection consists of a
one meter long shielded four-wire cable. The power and output
(P/O) wires are labeled accordingly. Connect the labeled power
wires from the SMU-9000 to the appropriate input supply voltage
that will be used. For example, the wire labeled “Positive Supply
Lead” on the SMU-9000 should be connected to the positive
supply voltage of the power source and the wire labeled “Negative
Supply Lead” should be connected to the negative supply voltage
of the power source.
Note: The power supply source being used should be turned off
when connecting the power and output wires of the SMU-9000 so
as to avoid accidentally shorting the system to ground.
If additional power and output cable lengths are added, or if
multiple units are connected to a common supply, it is
recommended that separate cable wires be provided for supply and
output leads to maintain maximum resolution. It should also be
noted that the most common limitations on signal resolution are
mechanical vibrations (microphonics) of sensor/target
configurations.
SMU-9200 System
The SMU-9200 dual channel differential systems have a six
conductor shielded power and output cable providing separate
wires for supply and signal return leads. These, along with the
sensor coax shields are all at a common internal “ground”
potential. In addition, each channel’s amplifier has a 100 ohm
output impedance. When operated as a differential system
(“balanced to ground” output taken from the two + labeled wires),
a common mode rejection of noise and “hum” is achieved by
connecting into a differential input device.
Output Wires
The output wires are labeled “Positive Signal Output” and
“Negative Signal Output Return”. The output wires can be
connected to a voltmeter, oscilloscope, or data acquisition system
in order to display actual displacement in volts. Connect the
Positive Signal Output wire to the Positive terminal and the
Negative Signal Output Return to the common terminal.