PCB Piezotronics 482A21 Manual de usuario

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: 716-684-0987

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: (800) 828-8840

24-hour SensorLineSM: (716) 684-0001

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

PCB板

电气连接器

压电晶体

环氧

铁氟龙

电子

厚膜基板

电线

电缆

塑料

焊接

铜合金/黄铜

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

PCB Board

Electrical

Connectors

Piezoelectric

Crystals

Epoxy

Teflon

Electronics

Thick Film

Substrate

Wires

Cables

Plastic

Solder

Copper Alloy/Brass

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

1.0 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

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

Short

Figure 2: Fault Monitor Table

MANUAL #: 19179

MANUAL REV: B

ECO: 43785

MODEL 482A21 LINE POWERED SIGNAL CONDITIONER

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

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

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:

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