3.0 INSTALLATION
Connect the 422E5X to the transducer
with low noise cable (003 type only).
Standard coaxial cable may be used
between the amplifier and power unit,
and between the power unit and readout
device. (Fig 2)
Fig 2
CAUTION:
Excessive accumulated charges on the
input cable can destroy the field effect
input transistor. These charges should be
grounded out by shorting the center pin
of the connector plug to the outer cable
conductor with a metallic object before
connecting them to the 422E5X charge
amp. Care should be taken to avoid
touching the input terminal to any object
that could possess an electric charge
(such as your fingers).
4.0 OPERATION
After connecting the 422E5X as
indicated in Fig 2 Energize the system
by turning on the power unit and waiting
a few minutes for the amplifier to turn
on.
For a simple, self-test circuit, monitor
the +9 to +12 V DC bias existing at the
output during normal operation with a
high impedance voltmeter. Many PCB
power units feature such a test circuit
(Fig 3).
Fig 3
–
A typical bias meter.
4.1 SYSTEM SENSITIVITY
When the sensitivity (pC/unit) of the
transducer is known (via calibration)
along with the transfer sensitivity of the
charge amp (mV/pC), the system
sensitivity of the system can be
calculated in the following manner:
System sens = (Xdcr Sens)(Amp Sens)
System sens is given in (mV/Unit)
Xdcr Sens is given in (pC/Unit)
Amp Sens is given in (mV/pC)
5.0 MAINTENANCE AND REPAIR
The 422E5X charge amplifier is
hermetically sealed, and requires no
maintenance. If the connectors become
dirty, clean with lint-free wipes
dampened with isopropyl alcohol.
For extremely dirty or humid
environments, the cable connections can
be protected with low temperature heat
shrink tubing.
Should trouble occur, the factory should
be contacted for assistance.
MANUAL NUMBER: 25578
MANUAL REVISION: NR
