PCB Piezotronics 8120G-400A Bedienungsanleitung

Model 8120G-400A

Strain Gage Sensor Signal Conditioner

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 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: (800) 828-8840

24-hour SensorLineSM: (716) 684-0001

Website: www.pcb.com

E-mail: [email protected]

DOCUMENT NUMBER: 21354

DOCUMENT REVISION: B

ECN: 17900

Table of Contents

Section 1.0 Description Page 1

Section 2.0 Installation and Cabling Page 1

Section 3.0 Calibration Page 7

Section 4.0 Calibration of PCB Rotary Transformer Torque Sensors Page 8

Section 5.0 Troubleshooting Page 9

Reference Figures

Figure 1 Bench Mounting Clearance Dimensions Page 2

Figure 2 Panel Mounting Cut-Out Dimensions Page 2

Figure 3 Panel Mount Assembly Page 3

Figure 4 Rack Mounting Dimensions Page 4

Figure 5 4200 Series Cabling Page 5

Figure 6 182-015A Connector Pin-Out Page 5

Figure 7 4-Conductor Cabling Page 5

Figure 8 4100 Series Cabling Page 5

Figure 9 8-Conductor Cabling Page 5

Figure 10 Remote Calibration Methods Page 6

Figure 11 Master / Slave Connections Page 6

Figure 12 Front Panel Descriptions Page 11

Figure 13 Rear Panel Descriptions Page 12

MODEL 8120-400A AC SIGNAL CONDITIONER OPERATION MANUAL

MANUAL NUMBER: 18222

REVISION: B

ECO NUMBER: 37012

MODEL 8120-400A AC SIGNAL CONDITIONER OPERATION MANUAL

1.0 DESCRIPTION

Model 8120-400A Transducer Signal

Conditioner/Amplifier is designed for use with

resistance strain gage transducers that require

an AC excitation-amplification source. It

supplies a 3.28 kHz frequency, precision

amplitude-regulated excitation, which is

remotely sensed to the transducer. The

instrument uses a phase-sensitive carrier

amplifier-demodulator design so that both

direction and magnitude of the applied force are

determined. The 8120-400A contains all

necessary balancing and calibration controls

and condition/amplify the applied input to a

standard ±5 volt DC analog output level. Two

analog outputs, both having low-pass cutoff

frequencies, one of 2 Hz and the other of 400

Hz, are provided. The filtered outputs provide

for averaging of signals containing noise or

other unwanted dynamic components that are

periodic in nature.

The 8120-400A is used in applications

involving transformer coupling of the strain

gage bridge (rotary transformer coupled torque

sensors for example), and in applications that

require a high sensitivity (amplification) with

optimum "signal to noise" characteristics.

Carrier amplifiers offer higher sensitivity than

comparable DC-excited bridge amplifiers, and

since they respond only to the modulated carrier

frequency, they reject certain extraneous

voltages that cause interference with DC-

excited bridge instruments.

Note: If you have a PCB rotary transformer

torque sensor, please refer to Section 3 of this

manual, or to either the 4100 Series Rotary

Transformer Torque Sensor Manual (PCB

Manual #18227), or the 4200 Series Rotary

Transformer Torque Sensor Manual (PCB

Manual #18228), for calibration procedures.

Calibration of the instrument is made through

conventional shunt technique, using an

internally installed calibration resistor, or an

external shunt calibration reference, such as our

Model 8113A or 8113-105A Shunt Calibration

References. Front panel calibration buttons

provide for calibration in both the positive and

negative directions. An internal symmetry

control provides independent adjustment of the

negative direction sensitivity for transducers

that do not have symmetrical positive and

negative slope characteristics. Positive

direction calibration can be checked by means

of REMOTE CAL terminals on the instrument

I/O connector.

The 8120-400A Strain Gage Conditioner is also

available in two additional forms. The 8120-

410A is similar to the 8120-400A except it also

contains a dedicated 4.5 digit LED display with

a 3Hz update rate. The resolution of the digital

display is 1:5000 (0.02% FS). The display also

has a selectable decimal point, trick count

multiplier, and a trailing inert zero. For more

information on instruments with digital display,

refer to PCB Manual #27259. The Model

8120-430A contains a Limit section (in addition

to a Digital Indicator) that provides

High/OK/Low indications and outputs. Refer to

PCB Manual #19479 for more information.

The Digital Indicator and Limit features are

standard to all 8120 Series Instruments.

2.0 INSTALLATION AND CABLING

The following paragraphs provide the

instructions for instrument installation and

cabling.

Mounting

The 8120 Series Instruments can be operated as

bench-top units or they can be rack or panel

mounted. Clearance dimensions for a bench-

mounted instrument are given in Figure 1 and

cut-out dimensions for panel mounting are

shown in Figure 2.

MODEL 8120-400A AC SIGNAL CONDITIONER OPERATION MANUAL

Figure 1 – Bench Mounting Clearance Dimensions

Figure 2 – Panel Mounting Cut-Out Dimensions

To panel mount an instrument, proceed as follows, referring to Figure 3.

Important: The unit is shipped with two spacer washers on the securing screws of the rear-panel I/O

connector. When panel-mounting the unit, you must remove these washers so that the printed circuit

board may move forward about 1/8" during Step (6).

1. Remove the front panel by removing the two #2-56 x 3/8” flat-head screws.

2. Remove the front bezel by removing the four #6-32 x 5/8” fillister-head screws.

3. Make the panel cut-out and drill the screw clearance holes indicated in Figure 2. The front

bezel can be used as a template to define the rectangular cut-out and locate the clearance holes.

4. Hold the instrument enclosure behind the panel and re-attach the front bezel to the enclosure

from the front of the panel with the four remaining screws.

5. Reinstall the front panel.

MODEL 8120-400A AC SIGNAL CONDITIONER OPERATION MANUAL

6. Tighten the two securing screws of the rear panel I/O connector to ensure that the connector is

seated and that the conditioner printed-circuit board is pushed fully forward so that the front-

panel screwdriver adjustments and buttons are accessible. These screws give approximately 1/8

inch adjustment; consequently, this is the maximum panel thickness that should be used.

Caution: Do not over tighten the connector securing screws or resultant damage may occur to the

printed-circuit board.

8120 SERIES

MODULE

Figure 3 – Panel Mount Assembly

To rack mount an instrument, refer to Figure 4. Up to four 8120 Series Instruments can be mounted in a

19-inch rack using the 1.75-inch high Model 8171A Rack Adaptor.

MODEL 8120-400A AC SIGNAL CONDITIONER OPERATION MANUAL

Figure 4 – Rack Mounting Dimensions

AC Power Connection

To protect operating personnel, the 8120 Series

Instruments are equipped with a three-

conductor power cord. When the cord is

plugged into the appropriate receptacle, the

instrument is grounded. The offset pin on the

power cord is ground. To maintain the safety

ground when operating the unit from a two-

contact outlet, use a three-prong to two-prong

adaptor and connect the green pigtail on the

adaptor to ground.

To prepare the instrument for operation,

connect the power cable to a 105-135 volt AC,

50-400 Hz power source. The instrument can

use up to 5 watts of power.

Calibration Resistor

If a fixed resistor is shunted across one arm of a

strain gage Wheatstone Bridge, it produces an

unbalance equivalent to that of a particular

value of mechanical input. If this Equivalent

Input value is accurately known, it can be used

as a reference point for shunt calibration of the

system. Upon completion of installation of the

transducer and its associated cabling, the user

can:

1. Perform an overall dead weight calibration

using a precisely known value of

mechanical input. Shunt calibration data

then can be collected by means of the

installed calibration resistor for

convenience in subsequent checking.

2. Replace the installed calibration resistor

with one (or an equivalent resistance value)

supplied by the transducer manufacturer to

achieve a precisely known Equivalent Input

allowing the instrument sensitivity to be

adjusted correctly.

3. Determine the Equivalent Input value for

the installed calibration resistor, knowing

the transducer sensitivity, and adjust the

instrument sensitivity accordingly.

4. A precision 59KΩcalibration resistor is

installed in the 8120 at the factory. The

installed resistor can usually be used even

though the transducer calibration data

mentions some other resistance value. In

Section 3 of this manual, the techniques

described above are demonstrated. If,

however, the installed value of calibration

resistor is not appropriate for the transducer

and measurement range to be used, the

59KΩresistor should be replaced at this

time. The calibration resistor is mounted

on solder terminals located at the front edge

of the conditioner printed-circuit board in

the instrument. It can be accessed by

removing the front panel.

Note: PCB 4200 Series Rotary Transformer

Torque Transducers are supplied with the

appropriate calibration resistor integral to the

transducer. When this type of transducer is

used with the 8120-400A, it is not necessary to

remove the 59KΩresistor internal to the

instrument. The calibration resistor can be

appropriately connected to the 8120-400A

calibration circuit via the transducer cabling.

Refer to Figure 5 and the following section.

MODEL 8120-400A AC SIGNAL CONDITIONER OPERATION MANUAL

Figure 5 – PCB 4200 Series Cabling

Transducer Cabling

Cabling to the transducer is accomplished via

the supplied instrument I/O connector (PCB

Model 182-015A). The I/O connector pin

numbers and functions are given in Figure 6.

Rear View

PIN PIN

1 +EXCITATION A +SENSE

2 -EXCITATION B -SENSE

3 +SIGNAL INPUT C CALIBRATION SENSE

4 - SIGNAL INPUT D OSC. DISABLE

5 SIGNAL COMMON E TRANSDUCER CABLE SHIELD

6 OSC. INPUT F OSC. OUTPUT

7 NC H ANALOG OUTPUT

8 REMOTE CALIBRATION J ANALOG OUTPUT

9 OUTPUT SHIELD K NC

10 OUTPUT SIGNAL COMMON L NC

Figure 6 – 182-015A Pin Out

Transducer cabling should take the form of a 4,

6, or 8-wire cable configuration. The 4-wire

configuration, shown in Figure 7, should be

used when overall deadweight calibration is the

method used and the required cable length is

less than 20 feet.

Figure 7 – 4 Conductor Cabling

The 6-wire configuration, shown in Figure 8,

should be used when the instrument is to be

calibrated by achieving a precisely known

Equivalent Input value through the use of a

shunt calibration resistor supplied by the

transducer manufacturer and when the required

cable length is less than 20 feet.

Figure 8 – PCB 4100 Series Cabling

The 8-wire configuration, shown in Figure 9,

should be used with cable lengths longer than

20 feet since the excitation voltage is sensed

and regulated at the transducer and optimum

shunt calibration can be achieved.

Figure 9 – 8 Conductor Cabling

MODEL 8120-400A AC SIGNAL CONDITIONER OPERATION MANUAL

Remote Calibration Check

The instrument can be placed in the calibration

mode (positive realm only) by shorting pins 5

(Signal Common) and 8 (Remote Cal) of the

rear-panel I/O connector. Figure 10 indicates

three methods of remotely entering the

calibration mode (external switch, transistor, or

TTL source).

Figure 10 – Remote Calibration Methods

Master/Slave Connections

When more than one 8120-400A (or a

combination of AC Carrier Conditioners) is

being used in a measurement setup (instruments

are continuously mounted or the transducer

cabling is in a common conduit or raceway),

beat frequencies may be produced from the 3-

kHz oscillators used in the instruments to power

the transducer(s) excitation. To prevent beat

frequencies from occurring, one unit can be

designated the Master, and the other units can

be driven from the Master oscillator. The

remaining units are designated as Slave

instruments. To connect as Master/Slave units,

refer to Figure 11.

Figure 11 – Master/Slave Connections

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