DayTronic 3000 series Manual de usuario

MODEL

3170

STRAIN GAGE CONDITIONER

SB.5.1

INSTRUCTION MANUAL

3000

Instrument Series

No part of this document may be reprinted, reproduced, or used in any form or by

any electronic, mechanical, or other means, including photocopying and recording,

or in any information storage and retrieval system, without permission in writing

from Daytronic Corporation. All specifications are subject to change without notice.

Correction

to Model 3170 Instruction Manual, v. SB.5.1

The I/O Wiring Data in Fig. 4 of this manual does not give the correct shield pairing of

cable wires, which is shown in the revised diagrams below and on the following page:

+EXC

–EXC

+SENSE

–SENSE

+SIG

–SIG

CAL SENSE

Extra Wire, paired

with CAL SENSE,

unconnected at

Connector A

SHIELD

Bendix PT02E-10-6S

Burndy BT06AC-10-6S

Daytronic 400 Series

Transducer Connections

+EXC

–EXC

+SENSE

–SENSE

+SIG

–SIG

CAL SENSE

Extra Wire, paired

with CAL SENSE,

unconnected at

Connector A

SHIELD

Amphenol 97-3106A-

14S-6S, AN3057-6

Daytronic 500 Series

Transducer Connections

(cont’d)

Correction

to Model 3170 Instruction Manual, v. SB.5.1 (cont’d)

+SENSE

–EXC

–SENSE

+SIG –SIG

CAL

SENSE

SHIELD

+EXC

Daytronic 3X70 Instrument to Generalized Strain Gage Transducer

4-Wire Configuration for Cables

Shorter Than 20 Feet

+SENSE

–EXC

–SENSE

+SIG –SIG

CAL

SENSE

SHIELD

Extra Wire, paired with CAL SENSE,

unconnected at Connector A

+EXC

6-Wire Configuration for Cables

Shorter Than 20 Feet

+SENSE

–EXC

+SIG –SIG

CAL

SENSE

SHIELD

Extra Wire, paired with CAL SENSE,

unconnected at Connector A

–SENSE

+EXC

8-Wire Configuration for Cables

Longer Than 20 Feet

MODEL

3170

STRAIN GAGE CONDITIONER

INSTRUCTION MANUAL

Model 3170 Instruction Manual, v. SB.5.1

Pub. No. 3170M.5.1, Issued 03/01

Part No. 91132

Daytronic Corporation

Dayton, OH • Tel (800) 668-4745

www.daytronic.com

Daytronic Corporation

TABLE OF CONTENTS

Section Page

Description ................................................. 1

Installation and Cabling ......................................

Calibration .................................................. 8

Block Diagram Description ................................... 12

Verification of Normal Operation ..............................

LIST OF ILLUSTRATIONS

Figure

Page

Model 3170 Strain Gage Conditioner...........................

Instrument Mounting Dimensions ............................. 4

Instrument Panel Mounting .................................. 5

I/O Wiring Data ............................................

Front-Panel Description ...................................... 11

Block Diagram .............................................. 15

Star-Bridge Construction ..................................... 17

LIST OF TABLES

Table

Page

PLEASE NOTE: Sections 6 and 7, Figures 8 and 9, and Table 2 have been

removed from this manual.

If you need information regarding specific 3170 components and circuitry,

please contact the Daytronic Service Department at (937) 293-2566.

1Specifications ............................................... 2

Daytronic Corporation

INSTRUCTION MANUAL

MODEL 3170 STRAIN GAGE CONDITIONER

1. DESCRIPTION

The Model 3170 conditioner-amplifier module for use with resistance strain

gage transducers. It supplies a regulated dc excitation voltage to the transducer

bridge, provides the necessary balancing and calibration controls, and amplifies the

resulting signal to a standard Five-Volt Data Signal Level which is the output analog

signal level of 3000 Series Modules. The

3170

has three separate analog outputs,

each having a different bandpass: (1) dc to 2

kHz,

(2) dc to 200 Hz, and (3) dc to 2

Hz. Active low-pass filters are used to achieve the 200 Hz and 2 Hz cutoff

frequen-

cies.

The filtered outputs provide for averaging or smoothing signals containing

noise or other unwanted dynamic components which are periodic in nature. Filter-

ing removes these dynamic components so that stable digital indication and precise,

jitter-free control action can be obtained. The Model 3170 is shown in Figure 1 and

the specifications are given in Table 1.

Figure 1. Model 3170 Strain Gage Conditioner

Model 3170

Table

Specifications

Transducers: 4-arm bridges, 90

2000 ohms, nominally 1

mv/v,

full

scale (120 ohms or less requires use of 5-volt excitation).

Cables:

4-,

5-,

or 7-wire, depending on application; 1000

feet

maximum length.

Bridge Excitation: Regulated 5 volts or 10 volts dc, selected

with

I/O

connector wiring. Transducers

with

sensitivity from 4 to 8

mv/v

full

scale must use

5-volt

excitation.

Balance Adjustments:

10-turn

coarse and fine; will balance 1.5

mv/v

initial unbalance.

Span Adjustments:

10-turn

coarse and fine; 1to 8

mv/v,

full scale.

Analog Outputs: Three analog outputs available; 0 to ±5 volts with

50% overange,

milliamperes maximum.

Bandpass

is dc

2 kHz, dc

to 200 Hz, or dc to 2 Hz, depending on

output

used. Active low-pass

filters provide for rolloff of 60

per decade above cutoff frequency.

Full-scale slew

time

is 1.4/f seconds, where f is

the

cutoff frequency.

Common Mode Rejection: Greater

than

dB.

Output Ripple and Noise: 0.15% of full scale (rms) maximum for

2-kHz and 100-Hz outputs; 0.02% of full scale (rms) on 2-Hz output.

Accuracy: 0.05% of full scale.

Dimensions: 1.7 x 4.41 x 8.5 (HWD inches).

Operating Temperature Range: 0 to + 130 degrees F.

Power Requirements: 105 to 135 volts ac, 50 to 400 Hz at 5 watts

maximum.

Daytronic Corporation

Remote sensing techniques are used to regulate the excitation voltage at the

transducer. Either a 10-volt or a

5-volt

excitation voltage can be selected by

appropriate wiring at the module

I/O

connector. The excitation voltage is protected

against overloads and accidental short circuits.

The 3170 uses a CMOS chopper-stabilized differential signal amplifier which

has over

100-megohms

input impedance per input line. This circuit guarantees

negligible drift with temperature variations or component aging.

Calibration of the 3

170

is accomplished by the conventional shunt technique,

using an internally installed calibration resistor. A front-panel CAL button or

Remote

Cal

terminals on the module I/O connector can be used to initiate the

calibration procedure.

The 3

170

Strain Gage Conditioner is also available in two additional forms. The

Model 3270 includes the addition of a digital indicator to view the analog output of

the conditioner. The Model 3370 includes a Limit section (in addition to a digital

indicator) which provides high, low, and ok indications and outputs. The digital

indicator and limit options are standard to all 3000 Modules and are covered in

separate instruction manuals.

INSTALLATION AND CABLING

The following paragraphs provide the instructions for module installation and

cabling.

Module Mounting. The 3000 Series Modules can be operated as bench-top

instruments or they can be rack- or panel-mounted. Clearance dimensions for a

bench-mounted instrument are given in Figure 2. Panel cut-out dimensions for

panel mounting are also shown in Figure 2. Up to four 3000 Series instruments can

be mounted in a

19-inch

rack using the

1.75

-inch high Model 3004 Rack Adaptor.

Rack-mounting dimensions are also given in Figure 2. To panel mount an instru-

ment, proceed as follows. Refer 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 (f).

(a)

Remove the front panel by removing the two 2-56 x

3/8

flat-head screws.

Model 3170

Figure 2. Instrument Mounting Dimensions

C. Panel Mounting

B. Rack Mounting

A. Bench Mounting

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