WPI ISDB Manuale utente

WORLD

PRECISION

INSTRUMENTS

ISDB

ISO-DAM 8A and BRIDGE8

Serial No._____________________

www.wpiinc.com

INSTRUCTION MANUAL

060920

ISDB

World Precision Instruments i

be reproduced or translated into any language, in any form, without prior written permission of World

Precision Instruments, Inc.

CONTENTS

BRIDGE8............................................................................................................................................ 1

Introduction................................................................................................................................ 1

Unpacking ............................................................................................................................. 2

Instrument Description ........................................................................................................... 2

Operations.................................................................................................................................. 2

Positioning the Output to Zero........................................................................................ 3

Bridge Switch........................................................................................................................ 3

Transducer Calibration ...................................................................................................... 4

Example ................................................................................................................................. 4

General Amplication......................................................................................................... 4

Specications ............................................................................................................................. 4

ISO-DAM8A....................................................................................................................................... 6

Introduction................................................................................................................................ 7

Notes and Warnings........................................................................................................... 7

Unpacking ............................................................................................................................. 7

Instrument Description ........................................................................................................... 8

Noise and Interference...................................................................................................... 8

Input Connection................................................................................................................. 8

Input Cable............................................................................................................................ 9

Source Select Switch........................................................................................................... 9

Balance Adjustment............................................................................................................ 9

Output.................................................................................................................................... 9

Filters....................................................................................................................................10

DC Oset .............................................................................................................................10

Single Channel Installation..............................................................................................10

Operating Instructions...........................................................................................................10

Input Connections.............................................................................................................11

Output Connections .........................................................................................................12

Grounding ...........................................................................................................................12

Shielding ..............................................................................................................................12

Idle Settings ........................................................................................................................12

Control Adjustment ..........................................................................................................12

Specications ...........................................................................................................................13

WARRANTY .....................................................................................................................................15

Claims and Returns ................................................................................................................15

Repairs.......................................................................................................................................15

ii World Precision Instruments

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World Precision Instruments 1

BRIDGE8

The following symbols are used in this guide:

This symbol indicates a CAUTION. Cautions warn against actions that can cause

damage to equipment. Please read these carefully.

This symbol indicates a WARNING. Warnings alert you to actions that can cause

personal injury or pose a physical threat. Please read these carefully.

NOTES and TIPS contain helpful information.

Fig. 1—Up to eight rackmountable ISO-DAM8A and Bridge8 modules can be combined in a

single chassis.

Introduction

Any combination of ISO-DAM8A or Bridge-8 modules may be combined in the same

instrument main frame. Bridge-8 includes a dierential amplier featuring high input

impedance, high common mode rejection of electrical interference and low current

leakage input terminals. Force, pressure, temperature, displacement, light and other

physical parameters are readily measured. Thermocouple wire transducers with cold

junction references for a wide range of temperature monitoring are also available.

2 World Precision Instruments

Each channel contains: a regulated DC power supply, 10V (+5 and –5V with respect

to signal ground) to provide DC power to transducers and a precision dierential

amplier with selectable voltage amplication and variable position adjustment

control. Each module includes a low pass lter with conditioner for strain gauges and

other transducers.

Unpacking

Upon receipt of this instrument, make a thorough inspection of the contents and

check for possible damage. Missing cartons or obvious damage to cartons should be

noted on the delivery receipt before signing. Concealed damage should be reported

at once to the carrier and an inspection requested. Please read the section entitled

“Claims and Returns” on page 15 of this manual. Please contact WPI Customer

Service if any parts are missing at 941.371.1003 or [email protected].

Returns: Do not return any goods to WPI without obtaining prior approval (RMA

# required) and instructions from WPI’s Returns Department. Goods returned

(unauthorized) by collect freight may be refused. If a return shipment is necessary,

use the original container, if possible. If the original container is not available, use a

suitable substitute that is rigid and of adequate size. Wrap the instrument in paper or

plastic surrounded with at least 100mm (four inches) of shock absorbing material. For

further details, please read the section entitled “Claims and Returns” on page 15 of

this manual.

Instrument Description

Single Channel Installation

1. Remove two screws on the right and left sides of the instrument enclosure,

respectively. Then remove eight screws on the bottom of the enclosure.

2. Slide the internal chassis out of the enclosure.

3. Remove the two screws holding the blank panel where the new channel is to be

installed.

4. Plug the connector of this channel into the new module and then secure the

channel in position with two screws.

5. Slide the chassis into the enclosure and reinstall all screws.

Operations

Transducers are connected to Bridge-8 via the 8-pin transducer input connector on

the front panel. Spare 8-pin DIN plugs are provided with each instrument to allow

you to rewire the cables of other manufacturers’ transducers to connect to Bridge-8

modules (Fig. 2).

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World Precision Instruments 3

S H IE L D

- 5 V

+ 5 V

+ O UT

- O U T

TRANSDUCE R P L UG (SOL DER SIDE)

G ND

Fig. 2—Wiring schematic for the 8-pin DIN connection.

Positioning the Output to Zero

Insert the transducer plug into the panel transducer input connector. Switch the

Gain Select switch for the channel being used to x10 and set the Bridge switch to

Dierential. Turn on the Power switch at the top of the panel. One or both of the

two red Oset Adjust indicator lamps will light if a transducer is plugged into the

appropriate connector on the front panel. Output coaxial connectors for all channels

are located on the rear panel of the instrument. If the – lamp is lit, the output voltage

level is minus. If the + lamp is lit, the output voltage level is positive. To bring the

output voltage level to nearly zero volts, adjust the Oset Adjust knob above the Gain

switch so that both lamps are lit together. A signicant increase in the sharpness or

resolution of the zero adjustment may be achieved by increasing the gain to x100.

Bridge Switch

Many transducers congured as Wheatstone bridges with four resistive elements will

directly access the dierential amplier, as represented in Fig. 2. When the Bridge

switch is in the Dierential position, both inputs of the dierential amplier, inverting

and non-inverting, are connected to the signal terminals of the transducer bridge. In

single-ended operation, the inverting input of the dierential amplier is connected

to a variable reference potential leaving the non-inverting input available to the signal

source. In the Gnd (ground) position both the inverting and the non-inverting inputs

are connected to ground.

+ out

- out

SHIELD

+5 v

-5 v

Fig. 3—This transducer is congured as a Wheatstone bridge with four resistive elements.

4 World Precision Instruments

Transducer Calibration

Bridge-8 provides xed and accurate decade amplication steps. Of most interest to

the user, however, may be the conversion factor from the physical variable—grams,

mm of Hg, mm of displacement—to output voltage. Since the transducer’s conversion

factor is often not exactly known and varies with the voltage applied to the sensor

(10 volts from Bridge-8), it is therefore necessary for the user to calibrate the system

using known forces, pressures or displacements to scale the output of Bridge-8

quantitatively with the original physical parameter being measured.

Example

A typical pressure transducer is nominally rated at 5 microvolts out per volt of

excitation per mm of Hg. To compute the approximate output from Bridge-8 for this

transducer:

5 µV/V • 10 V • Amplication = 0utput µV per mm Hg

Thus, if we had selected x100 Amplication, the output per mm Hg would be

approximately 5 mV per mm Hg. Since the nominal rating of 5 µV per volt is usually

not exact, the user must, in the end, calibrate the transducer with a known hydrostatic

pressure to obtain an accurate conversion factor. (WPl’s model PM015 Pressure

Monitor/Calibrator is a suitable hydrostatic pressure calibration device.)

General Amplication

For transducer types other than resistive bridges, such as active transistor circuits,

magnetic, photocell or piezoelectric devices, the instrument’s dierential amplier may

still be used for signal amplication in dierential and single-ended modes. Note that

pin 7, instrument ground, must be connected to the circuit ground of the input source

to achieve eective amplication. Careful shielding of signal generating devices will

result in lower noise “pickup” by the signal input wiring.

SHIE LD

7signal gnd

+ 5

-5

ext.

sig.

source

Specications

Voltage Amplication .....................................x1, x10, x50, x100, x500, x1000 & adjustable

Input Impedance .................................................................................................................> 1012Ω

Input Leakage Current ...............................................................................< 0.1pA at 25°C, typ.

Voltage Oset Adjustment ............................................................. ± 50mV (low oset range),

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World Precision Instruments 5

............................................................................................................. ± 100mV (high oset range)

Amplier Output Voltage ............................................................................± 5.0V (10mA, max.)

Transducer Excitation .....................................................................10V (± 5.0V) (100mA, max.)

Low Pass Filter Band (kHz) ...................................... 0.03, 0.1, 0.3, 1, 5, 10, and “wide band”

Enclosure Dimensions............................................................... 7 x 17 x 9.2˝ (18 x 43 x 23cm)

F-QC-006 Rev C

WORLD PRECISION INSTRUMENTS, LLC.

175 Sarasota Center Boulevard

Sarasota, FL 34240-9258 USA

Telephone: (941) 371-1003 Fax: (941) 377-5428

E-mail: [email protected]

DECLARATION OF CONFORMITY CE

We: World Precision Instruments

175 Sarasota Center Boulevard

Sarasota, FL 34240-9258 USA

As the manufacture/distributor of the apparatus listed, declare under sole responsibility

that the product(s):

WPI PN: ISDB SERIES

To which this declaration relates is/are in conformity with the following standards or

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