PCB Piezotronics 482A21 User manual

Model 482A21
1-channel, line-powered, ICP® sensor signal cond., unity gain, BNC
Installation and Operating Manual
For assistance with the operation of this product,
contact PCB Piezotronics, Inc.
Toll-free: 800-828-8840
24-hour SensorLine: 716-684-0001
Fax: [phone]
E-mail: [email protected]
Web: www.pcb.com

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 traceability to SI through
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
Warranty, Service, Repair, and
Return Policies and Instructions

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, NY14043 USA
Toll-free: [phone]
24-hour SensorLineSM: [phone]
Website: www.pcb.com
E-mail: [email protected]

PCB工业监视和测量设备 - 中国RoHS2公布表
PCB Industrial Monitoring and Measuring Equipment - China RoHS 2 Disclosure Table
部件名称
有害物质
铅(Pb)
汞
(Hg)
镉
(Cd)
六价铬(Cr(VI))
多溴联苯 (PBB)
多溴二苯醚(PBDE)
住房
O
O
O
O
O
O
PCB板
X
O
O
O
O
O
电气连接器
O
O
O
O
O
O
压电晶体
X
O
O
O
O
O
环氧
O
O
O
O
O
O
铁氟龙
O
O
O
O
O
O
电子
O
O
O
O
O
O
厚膜基板
O
O
X
O
O
O
电线
O
O
O
O
O
O
电缆
X
O
O
O
O
O
塑料
O
O
O
O
O
O
焊接
X
O
O
O
O
O
铜合金/黄铜
X
O
O
O
O
O
本表格依据 SJ/T 11364 的规定编制。
O：表示该有害物质在该部件所有均质材料中的含量均在 GB/T 26572 规定的限量要求以下。
X：表示该有害物质至少在该部件的某一均质材料中的含量超出 GB/T 26572 规定的限量要求。
铅是欧洲RoHS指令2011/65/ EU附件三和附件四目前由于允许的豁免。
CHINA RoHS COMPLIANCE

DOCUMENT NUMBER: 21354
DOCUMENT REVISION: C
ECN: 45605
Component Name
Hazardous Substances
Lead
(Pb)
Mercury
(Hg)
Cadmium
(Cd)
Chromium VI
Compounds
(Cr(VI))
Polybrominated
Biphenyls
(PBB)
Polybrominated
Diphenyl
Ethers (PBDE)
Housing
O
O
O
O
O
O
PCB Board
X
O
O
O
O
O
Electrical
Connectors
O
O
O
O
O
O
Piezoelectric
Crystals
X
O
O
O
O
O
Epoxy
O
O
O
O
O
O
Teflon
O
O
O
O
O
O
Electronics
O
O
O
O
O
O
Thick Film
Substrate
O
O
X
O
O
O
Wires
O
O
O
O
O
O
Cables
X
O
O
O
O
O
Plastic
O
O
O
O
O
O
Solder
X
O
O
O
O
O
Copper Alloy/Brass
X
O
O
O
O
O
This table is prepared in accordance with the provisions of SJ/T 11364.
O: Indicates that said hazardous substance contained in all of the homogeneous materials for this part is below the limit
requirement of GB/T 26572.
X: Indicates that said hazardous substance contained in at least one of the homogeneous materials for this part is above
the limit requirement of GB/T 26572.
Lead is present due to allowed exemption in Annex III or Annex IV of the European RoHS Directive 2011/65/EU.

MANUAL #: 19179
MANUAL REV: B
ECO: 43785
MODEL 482A21 LINE POWERED SIGNAL CONDITIONER
1
1.0 Introduction and Specifications
A specification sheet and outline drawing are located in the rear of this manual.
1.1 Introduction: Safety Considerations
WARNING 1: The power supply/signal conditioner should not be opened by anyone other than qualified service
personnel. This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the
safety precautions required to avoid injury.
WARNING 2: This equipment is designed with user safety in mind; however, the protection provided by the equipment
may be impaired if the equipment is used in a manner not specified by PCB Piezotronics, Inc.
Caution 1: Cables can kill your equipment. High voltage electrostatic discharge can damage electrical devices. Similar
to a capacitor, a cable can hold a charge caused by triboelectric transfer, such as that which occurs in the following:
Laying on and moving across a rug.
Any movement through air.
The action of rolling out a cable.
Contact with a non-grounded person.
The solution for product safety: 1) Connect the cables only with the AC power off. 2) Temporarily “short” the end of
the cable before attaching it to any signal input or output.
Caution 2: ESD considerations should be made prior to performing any internal adjustments on the equipment. Any
piece of electronic equipment is vulnerable to ESD when opened for adjustments. Internal adjustments should therefore
be done ONLY at an ESD-safe work area. Many products have ESD protection, but the level of protection may be
exceeded by extremely high voltage.
WARNING SYMBOLS AND TERMS
The following symbols and terms may be found on the equipment described in this manual.
This symbol on the unit indicates that the user should refer to the operating instructions located in the manual.
This symbol on the unit indicates that high voltage may be present. Use standard safety precautions to avoid
personal contact with this voltage.
This symbol indicates safety, earth ground.
The WARNING heading used in this manual explains dangers that might result in personal injury or death. Always
read the associated information very carefully before performing the indicated procedure.
The Caution heading used in this manual explains hazards that could damage the instrument.

MANUAL #: 19179
MANUAL REV: B
ECO: 43785
MODEL 482A21 LINE POWERED SIGNAL CONDITIONER
2
1.2 Introduction
Model 482A21 is a single-channel, line-operated signal conditioner for ICP®transducer systems. This unit provides
constant current excitation to the built-in transducer amplifier and decouples the signal from the DC bias voltage.
The unit also contains provision for fault monitoring the channel, as well as provision for externally varying the constant
current output over a 2 to 20 mA range. This model is factory set at 4 mA.
2.0 Description
Model 482A21 is powered externally by universal power supply model 488B04. The rear panel contains a BNC jack for
transducer signal INPUT and a BNC jack for signal OUTPUT connections.
The AC signal information is decoupled from the sensor bias by a coupling capacitor and brought out to the OUTPUT
jack.
The bias monitor located on the front panel consists of a color-coded panel meter that permanently monitors the sensor
bias level. See sensor specification for correct sensor bias level.
3.0 Installation
See the included outline drawing for dimensions, as well as jack and control locations. Plug the five-pin DIN output
connector on 488B04 into the DC INPUT located on the rear panel of 482A21.
Plug the three-wire line cord of the 488B04 into a source of 85 to 264 VAC, 47 to 440 Hz power and switch the power
on for 482A21.
Pins 3 and 5 are (+)
Pins 1, 2 and 4 are (-)
Outside shell is earth/chassis ground
Figure 1: External Power Connector and Pin Numbers
Note: For battery operation use model 488B07 in place of model 488B04.
With no transducer connected to the INPUT connector, the front panel bias indicator meter indicates full scale (yellow),
which corresponds to open circuit power supply voltage. See Figure 2.
Meter Reading
Yellow
Green
Red
Condition
Open
Ok
Short
Figure 2: Fault Monitor Table

MANUAL #: 19179
MANUAL REV: B
ECO: 43785
MODEL 482A21 LINE POWERED SIGNAL CONDITIONER
3
When an ICP®transducer (or in-line amplifier) is connected to the INPUT jack, the front monitor meter indicates
approximately midscale (green) if the transducer or amplifier is functioning properly. It does not read midscale if the
transducer bias is 3 to 5 volts.
If a cable is faulty (open), or the sensor's built-in amplifier is open, the meter indicates a yellow (full scale) reading.
When a cable or transducer is shorted, the meter indicates zero volts (red).
Immediately after connecting a readout instrument (oscilloscope, meter, or recorder) to the OUTPUT jack, the coupling
capacitor begins charging through the input resistance of the readout instrument. This charging causes an apparent
"drifting" of the output signal until the capacitor is fully charged. The normal amount of leakage through the coupling
capacitor usually results in a <20 mV maximum DC offset.
4.0 Coupling Time Constant, AC Coupled
The coupling time constant (TC) is the product of the coupling capacitor (47 µF) and the input resistance of the readout
instrument, in parallel with the 274 kilohm shunt resistor. Typically, this is ten seconds, assuming the input resistance of
the readout measurement is one megohm.
In most cases, it is desirable to keep the coupling TC long, with respect to the transducer discharge TC, to minimize the
effect of the coupling TC on low frequency response.
4.1 Driving Long Cables
When driving long cables, it may be necessary to increase the constant current drive to the transducers. 482A21 is
normally supplied with the constant current output to the transducer set at 4 mA nominal. This is adequate for most
laboratory and field applications. Special situations, such as driving long cables (beyond 100 ft) with high frequency or
fast rise time pulses, may require increasing the transducer drive current up to 20 mA.
When driving fast rise time pulses over long lines, system performance may be optimized by "tuning" the drive current
to the line; i.e., by finding the best current setting for the particular set of physical parameters established by the
transducer, line length, line termination, pulse rise time, etc.
The optimum current setting is best determined by experimentation with your particular test setup. A good rule of thumb
is to use the lowest current consistent with satisfactory results to minimize transducer self-heating and noise.
Another technique requires the use of impedance matching resistor model 073A connected immediately after the
transducer. This variable resistor is then used to "tune" the current to the line.
One of the best approaches is to test the long line with a signal generator set at a frequency of interest.
4.2 Setting the Constant Current
To set the constant current, locate the current adjust potentiometer on the rear panel. Connect a 0 to 30 mA DC ammeter
(or multimeter) to the INPUT jack (as shown in Figure 3). The constant current value is read directly on the ammeter.
Using a small regular screwdriver, vary the setting of the current adjust pot to set the current at a new level.
CAUTION: It may be possible to exceed 20 mA slightly. Do not do so; to operate an ICP®transducer or amplifier
above 20 mA may damage the equipment.

MANUAL #: 19179
MANUAL REV: B
ECO: 43785
MODEL 482A21 LINE POWERED SIGNAL CONDITIONER
4
Figure 3: Constant Current Adjust
5.0 Maintenance and Repair
Because of the sophisticated nature of PCB instrumentation, field repair of the equipment is not recommended. Most
PCB signal conditioners are of modular construction and are factory repairable. A repair or replacement quotation is
available at no charge. Before returning equipment for repair, it is advisable that the user confers with a factory
application engineer (or international representative) concerning the difficulty to ascertain if an on-site procedure
rectifies the problem.
If repair is indicated, contact PCB to request a Return Materials Authorization (RMA) number from the factory. An
advanced authorization to proceed with the repair, permitting charges of up to 50% of a new item, greatly expedites
repair.
For the most efficient service, please provide a detailed, written description of the malfunction encountered with the
equipment you are returning, together with your specific application and setup procedures. International customers
should return PCB equipment to their representative. For exceptions, please contact the International Sales department at
PCB to request shipping instructions and an RMA.
CURRENT ADJUST

MANUAL #: 19179
MANUAL REV: B
ECO: 43785
MODEL 482A21 LINE POWERED SIGNAL CONDITIONER
5
482A21 and 482A22 Troubleshooting Guide
Problem
Test/Solution
Unit does not appear to be powered
up/ No meter movement.
- Power switch in the on position.
- Test ‘sensor’ excitation current. Measure the current on the ‘sensor’ input
BNC from the center conductor to the shell. Adjust ‘Iadj’ (rear panel) with
screwdriver turning both clockwise and counterclockwise. Reference section
‘Setting the Constant Current.’
- Make sure the bias monitor channel select matches the channel of interest.
Output signal seems to drift.
- Make sure the input impedance of the readout device, scope or data
acquisition system is approximately 1 MΩ.
Low frequency response not meeting
specification or amplitude is
attenuated.
- The input impedance of the readout device may be too low. May need to use a
buffered signal conditioner, for example 482C16.
Meter does not seem to show sensor
bias voltage.
- Match the channel select with channel of interest.
- Measure the sensor bias while the sensor is attached to the unit. This requires
a ‘T’ connector to allow both the sensor and the measuring device to be
attached. If problem persists, return for repair.
MANUAL NUMBER: 19179
MANUAL REVISION:
ECO NUMBER: