PCB Piezotronics 422E53 User manual

Model 422E53
In-line Charge Converter
Installation and Operating Manual
For assistance with the operation of this product , contact the Division of PCB
Piezotronics, Inc.
Division toll-free 888-684-0015
24-hour SensorLineSM 716-684-0001
Fax [phone]
E-mail [email protected]

The information contained in this document supersedes all similar information that
may be found elsewhere in this manual.
Total Customer Satisfaction – PCB
Piezotronics guarantees Total Customer
Satisfaction. If, at any time, for any
reason, you are not completely satisfied
with any PCB product, PCB will repair,
replace, or exchange it at no charge. You
may also choose to have your purchase
price refunded in lieu of the repair,
replacement, or exchange of the product.
Service – Due to the sophisticated nature
of the sensors and associated
instrumentation provided by PCB
Piezotronics, user servicing or repair is
not recommended and, if attempted, may
void the factory warranty. Routine
maintenance, such as the cleaning of
electrical connectors, housings, and
mounting surfaces with solutions and
techniques that will not harm the
physical material of construction, is
acceptable. Caution should be observed
to insure that liquids are not permitted to
migrate into devices that are not
hermetically sealed. Such devices should
only be wiped with a dampened cloth
and never submerged or have liquids
poured upon them.
Repair – In the event that equipment
becomes damaged or ceases to operate,
arrangements should be made to return
the equipment to PCB Piezotronics for
repair. User servicing or repair is not
recommended and, if attempted, may
void the factory warranty.
Calibration – Routine calibration of
sensors and associated instrumentation is
recommended as this helps build
confidence in measurement accuracy and
acquired data. Equipment calibration
cycles are typically established by the
users own quality regimen. When in
doubt about a calibration cycle, a good
“rule of thumb” is to recalibrate on an
annual basis. It is also good practice to
recalibrate after exposure to any severe
temperature extreme, shock, load, or
other environmental influence, or prior
to any critical test.
PCB Piezotronics maintains an ISO-
9001 certified metrology laboratory and
offers calibration services, which are
accredited by A2LA to ISO/IEC 17025,
with full traceablility to N.I.S.T. In
addition to the normally supplied
calibration, special testing is also
available, such as: sensitivity at elevated
or cryogenic temperatures, phase
response, extended high or low
frequency response, extended range, leak
testing, hydrostatic pressure testing, and
others. For information on standard
recalibration services or special testing,
contact your local PCB Piezotronics
distributor, sales representative, or
factory customer service representative.
Returning Equipment – Following
these procedures will insure that your
returned materials are handled in the
most expedient manner. Before returning
any equipment to PCB Piezotronics,
contact your local distributor, sales
representative, or factory customer
service representative to obtain a Return
Warranty, Service, Repair, and
Return Policies and Instructions

Materials Authorization (RMA)
Number. This RMA number should be
clearly marked on the outside of all
package(s) and on the packing list(s)
accompanying the shipment. A detailed
account of the nature of the problem(s)
being experienced with the equipment
should also be included inside the
package(s) containing any returned
materials.
A Purchase Order, included with the
returned materials, will expedite the
turn-around of serviced equipment. It is
recommended to include authorization
on the Purchase Order for PCB to
proceed with any repairs, as long as they
do not exceed 50% of the replacement
cost of the returned item(s). PCB will
provide a price quotation or replacement
recommendation for any item whose
repair costs would exceed 50% of
replacement cost, or any item that is not
economically feasible to repair. For
routine calibration services, the Purchase
Order should include authorization to
proceed and return at current pricing,
which can be obtained from a factory
customer service representative.
Warranty – All equipment and repair
services provided by PCB Piezotronics,
Inc. are covered by a limited warranty
against defective material and
workmanship for a period of one year
from date of original purchase. Contact
PCB for a complete statement of our
warranty. Expendable items, such as
batteries and mounting hardware, are not
covered by warranty. Mechanical
damage to equipment due to improper
use is not covered by warranty.
Electronic circuitry failure caused by the
introduction of unregulated or improper
excitation power or electrostatic
discharge is not covered by warranty.
Contact Information – International
customers should direct all inquiries to
their local distributor or sales office. A
complete list of distributors and offices
can be found at www.pcb.com.
Customers within the United States may
contact their local sales representative or
a factory customer service
representative. A complete list of sales
representatives can be found at
www.pcb.com. Toll-free telephone
numbers for a factory customer service
representative, in the division
responsible for this product, can be
found on the title page at the front of this
manual. Our ship to address and general
contact numbers are:
PCB Piezotronics, Inc.
3425 Walden Ave.
Depew, NY 14043 USA
Toll-free: [phone]
24-hour SensorLineSM: [phone]
Website: www.pcb.com
E-mail: [email protected]
DOCUMENT NUMBER: 21354
DOCUMENT REVISION: B
ECN: 17900

Operating Instructions
422E5X Series
1.0 INTRODUCTION
The 422E5X series charge amplifiers
convert the high impedance charge
signal from a charge mode transducer to
a low impedance voltage signal.
This conversion is accomplished by the
use of a feedback capacitor across an
inverting amplifier (Fig 1). The gain of
the amplifier is sufficiently high to make
the charge amplifier gain virtually
independent of input capacitance
loading.
Fig 1
As in all charge amplifiers, the output is
inverting. Thus, any sinusoidal signal
will experience a 180 degree phase shift.
2.0 DESCRIPTION
The 422E5X series charge amps are .5
inch diameter by 3.4 inch long cylinders.
One 10-32 jack functions as input, one
BNC jack functions as output.
The amplifier operates on power
supplied by an ICP®power unit via a
simple two-wire coaxial cable.
During operation, the electrical charge
from the transducer is transferred to the
feedback capacitor, resulting in a voltage
given by the following equation:
V = Q/Cf
Q = the charge from the
transducer
Cf = the feedback capacitance
The accompanying 9V to 12V bias
voltage is typically removed by a 10uF
coupling capacitor internal to most PCB
ICP®power units.
A feedback resistor between 107and
1011 ohms (depending upon the specific
model) neutralizes unwanted, slowly
changing signal components resulting
from temperature effects and transistor
leakage. This resistor, along with the
feedback capacitor establishes the time
constant (low frequency response).
For low level measurements or remote
measurements over long cables, the
422E5X series improves the signal to
noise ratio and retains the high
frequency signal. The 422E5X series
requires little operator attention and
operates relatively drift-free in a
dynamic mode, an important
consideration in multi-channel
installations.

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