Intab PC-logger 3150 Mode d'emploi

How to use

PC-logger 3150

Hardware

with

accessories

Interface-Teknik AB

Gjutarevägen 1

SE-443 61 STENKULLEN

Tel. +46(0)302-246 00

www.intab.se, [email protected]

Rev. E, January 2003

MANUALS

of the

PC-Logger 3150 System:

-"How to Use PC-Logger 3150 " How to connect sensors and transducers

correctly

-"EasyView - manual" A tutorial guide to a user-friendly expert

data analysis program

-"Command Manual" Describes the ASCII strings (used by

software) that make the PC-Logger 3150

tick

iii

CONTENTS

MAIN UNIT......................................................................1

1 AN OVERVIEW ..............................................................................................................................1

1.1 G

ENERAL

NFORMATION

................................................................................................................1

1.2 O

LINE

ECORDINGS

....................................................................................................................2

1.3 O

LINE

ECORDINGS

..................................................................................................................2

1.4 S

TORAGE

APACITY

.......................................................................................................................2

1.4.1 Storage capacity in Computer .............................................................................................3

1.4.2 Storage Capacity in the PC-Logger 3150............................................................................3

1.5 B

LOCK

IAGRAM

...........................................................................................................................4

1.6 D

ISPLAY AND

EYS

(

OPTION

).........................................................................................................5

1.6 P

OWER SUPPLY

...............................................................................................................................6

2 INPUTS/RANGES ...........................................................................................................................7

2.1 R

ANGES

OLTAGE AND

URRENT

.................................................................................................8

3 CONNECTIONS..............................................................................................................................9

3.1 P

OWER

...........................................................................................................................................9

3.2 C

OMPUTER

.....................................................................................................................................9

3.3 I

NPUTS

.........................................................................................................................................10

3.3.1 Differential Inputs..............................................................................................................11

3.3.2 Common Mode...................................................................................................................12

3.4 S

ENSOR

ONNECTION

XAMPLES

................................................................................................13

3.4.1 Connecting 20mA current loops ........................................................................................13

3.4.2 Connecting Voltage Signals...............................................................................................15

3.5 C

OMMON CONNECTION ERRORS

...................................................................................................16

4 STARTING RECORDINGS.........................................................................................................19

4.1 S

TART

RIG

..................................................................................................................................19

4.1.1 Start on key-stroke .............................................................................................................19

4.1.2 Start on digital input..........................................................................................................20

4.1.3 Start on Analog Level ........................................................................................................20

4.1.4 Digital and Level Start combined......................................................................................20

4.2 S

TOP

RIG

....................................................................................................................................20

4.2.1 Stop on key-stroke..............................................................................................................20

4.2.2 Stop on Digital Signal........................................................................................................21

4.2.3 Stop on Analog Level.........................................................................................................21

4.2.4 Stop when Memory Full.....................................................................................................21

4.3 T

RIG

INDOW

OST

RIG

ECORDING

...............................................................................22

4.4 Illustration: Start, Stop and Trig Sequences...........................................................................23

4.5 T

RIG

UTPUT

...............................................................................................................................24

5 MISCELLANEOUS.......................................................................................................................25

5.1 M

ASTER

ESET

............................................................................................................................25

5.2 C

ONTROL

ROGRAM

....................................................................................................................25

6 TECHNICAL SPECIFICATIONS...............................................................................................26

6.1 ANALOG

CIRCUITS.................................................................................................................26

6.2 A

UXILIARY VOLTAGE SOURCE

......................................................................................................27

6.3 T

RIGGER INPUT

OUTPUT

...............................................................................................................27

6.4 S

TORAGE MEMORY

(

OPTIONAL

)....................................................................................................28

6.5 C

OMPUTER COMMUNICATION

.......................................................................................................28

6.6 C

OMMANDS

..................................................................................................................................28

iv CONTENTS

6.7 P

OWER

.........................................................................................................................................29

6.8 M

ECHANICAL SPECIFICATIONS

.....................................................................................................29

OPTION: Digital I/O and Pulse Counters......................31

1 OVERVIEW...................................................................................................................................31

1.1 D

IGITAL

UTPUTS

........................................................................................................................31

1.2 D

IGITAL

NPUTS

...........................................................................................................................32

1.2.1 Opto isolated inputs........................................................................................................32

1.2.2 TTL-compatible inputs.................................................................................................... 32

2 COUNTERS ...................................................................................................................................33

2.1 R

ESET MODE

................................................................................................................................33

2.2 N

ORMAL MODE

............................................................................................................................33

3 CONNECTIONS............................................................................................................................34

3.1 D

IGITAL OUTPUTS

........................................................................................................................35

3.2 D

IGITAL INPUTS

...........................................................................................................................35

3.2.1 Opto Isolated ................................................................................................................... 36

3.2.2 TTL Compatible...............................................................................................................36

4 TECHNICAL DATA.....................................................................................................................37

4.1 D

IGITAL

UTPUTS

........................................................................................................................37

4.2 D

IGITAL

NPUTS

25C

+/-10C) ................................................................................................37

4.2.1 Opto Isolated Inputs........................................................................................................37

4.2.2 TTL-compatible inputs....................................................................................................37

4.3 A

UXILIARY

OWER

......................................................................................................................38

4.3.1 for Opto-Couplers ...........................................................................................................38

4.3.2 for TTL-Inputs.................................................................................................................. 38

INDEX........................................................................................39

MAIN UNIT

1 AN OVERVIEW

MAIN UNIT

1 AN OVERVIEW

1.1 General Information

The PC-Logger 3150 is a very versatile addition to our line of Analog to

ASCII Converters. It will cover the medium measuring rate range: up to a 1000

times per second.

Input ranges are +/-10V; +/-1000mV; +/-100mV; +/-50mV; 20mA.

Pulse counters are available as an optional add-on.

An PC-Logger 3150 together with software and a personal computer

constitutes a powerful data acquisition system.

The main use is off-line when an internal memory (optional) of the PC-Logger

3150 stores data for later transferral to computer.

On-line use is also possible but is limited by the performance of connected

computer. Max speed has to be determined by experiment.

Main features are :

•8 analog inputs

•Programmable ranges on all inputs

•12 bit ADC

•Off-line memory data storage (optional)

•Trigger input and output

•Auxiliary voltage output

•Programmable sampling interval: 1ms to 1000ms

•Fully compatible with all INTAB logger software

The scope of this manual is to enable the user to correctly connect sensors and

transducers and use the PC-Logger 3150 off-line.

How the PC-Logger 3150 is handled using our software and a PC is explained

in the program manual and by the program itself by its user-friendly and self-

explanatory menus.

For best use and best results it is ABSOLUTELY essential that this

manual is studied in its entirety. Special emphasis should be put on

studying chapter 3 which describes how to connect transducers and other

signal sources.

2 INTAB Interface-Teknik AB

1.2 On-line Recordings

On-line measurements are performed with the PC-Logger 3150 connected to

the computer's RS-232 port. Measurements can in this mode be monitored in

real-timeon the computer's display. The user must however be aware of the

speed-limitations set by the computer: don't expect it to handle more than eight

channels five times a second. If you are the fortunate owner of a faster

computer with a fast disk-drive you can probably go faster.

The user him/herself has to determine the maximum speed on his/her particular

computer.

1.3 Off-line Recordings

Off-line recordings are possible with loggers equipped with (optional) data

memory.

Off-line measurements should be preceded by the transferral of measurement

parameters from the computer to the PC-Logger 3150.

These parameters contain, among others (see program manual), information

about measurement interval and what channels that are to be active. They are

effective until a new set of parameters are downloaded. The PC-Logger 3150

can, after downloading of the parameters, be disconnected from the computer

and started with the help of the keys next to the LCD (see section 1.5). After

all measurements are completed (see stop : section 4.2) the PC-Logger 3150 is

again connected to a computer for transferral of collected data (X-fer).

1.4 Storage Capacity

The number of measurements that can be stored by the PC-Logger 3150 and/or

computer is dependent on the size and type of memory used.

The longest possible duration of a recording is a function of the number of

channels that are active, sampling rate and the size of the storage medium.

A discussion of how the maximum length of a recording can be calculated

from known parameters follows below.

It is assumed that recordings are made using software supplied by INTAB.

MAIN UNIT

1 AN OVERVIEW

1.4.1 Storage capacity in Computer

Storage capacity in your computer can readily be calculated. The amount of

free space on the disk that will store your measurement data is the limiting

factor.

A 3½" disk will store more than 1,400,000 bytes. This is sufficient to store a

total of 700 000 values.

If we now consider a case where you sample and store 5 channels per second

the following formula applies:

Measuring time = 700 000/5 = 140 000 seconds or almost 40 hours. This time

is naturally multiplied by five if you only use one channel.

Another example: this storage space can be two measurement rounds, each of

two channels every other millisecond for a total duration of 700 seconds (or

nearly twelve minutes).

The formula you use is: interval*storage capacity divided by 2 and the number

of active channels : I*S/(2*C).

Apply this to a hard disk, and you will find that storage space will last a very

long time.

Remember that total storage time in a disk is the sum of all recordings. You

just have to allow for a header space of 16k bytes.

1.4.2 Storage Capacity in the PC-Logger 3150

Storage capacity in the PC-Logger 3150 itself is calculated almost in the same

way as it is calculated in the on-line case.

Three sizes of memory can be supplied: 64k, 64k+512k or 64k+1M.

Every value stored uses two bytes, so the formula in the previous section can

be used here too.

An example: having 64k memory, you want to measure four channels 10

times every second. The interval is 0.1 seconds.

The formula will then be: 0.1*64,000/(2*4)=800 seconds.

Note:

The internal memory of the PC-Logger 3150 will only store one recording at a

time. Starting a new recording will erase the previous one.

Recordings have to be transferred to your computer before loading new

parameters or starting new measurements.

4 INTAB Interface-Teknik AB

There is no limit to the number of times the same recording can be transferred

to the computer.

Measurement data will also not be lost if the internal batteries run down. A

back-up lithium battery will retain data for more than 10 years.

1.5 Block Diagram

This illustration shows a simplified block diagram of the PC-Logger 3150.

The expert notes that all amplification takes place before the multiplexer.

MAIN UNIT

1 AN OVERVIEW

1.6 Display and Keys (option)

The LCD (Liquid Crystal Display) with adjacent keys are supplied with all

PC-Logger 3150:s that are equipped with internal measurement data memory.

This display and key combination is indispensable when making off-line

recordings.

You indicate which function you want using the up/down arrows and then

confirm your choice with the OK-key.

The Multimeter is used to check transducer connections and function before

recording is started. You scroll up and down among the channels using the

up/down keys. Automatic scrolling is started with the key "hidden" under the

logo. A new channel is then shown every three seconds (try this feature by

pressing "PC-Logger 3100").

Record is selected when you intend to collect data. Verify your choice with

"OK". See illustration below and section 4 of this manual.

Starting a new recording will delete the previous one.

Don't forget to transfer data to the computer between recordings.

(*) See section 4 : TRIGGER.... for further information on starting and

stopping a recordings

6 INTAB Interface-Teknik AB

1.6 Power supply

The PC-Logger 3150 is normally powered by the supplied mains adaptor. It

has an output of 13.5V at a max of 500mA.

The PC-Logger 3150 is also fitted with internal rechargeable batteries. They

will give the user at least one hour of recording time without mains supply.

The batteries are trickle charged when the mains adaptor is connected. There is

no danger of overcharging the batteries, they should be left on charge to

prolong their life and keep them ready to use at all times.

Some applications require the PC-Logger 3150 to be powered by other

sources.

Use a cable fitted with a TA3F (Switchcraft) connector to connect to, for

example, a car battery.

Don't use sources supplying more than 16V as this is the maximum allowed.

The PC-Logger 3150 will "fall asleep", if it isn't powered by an outside source,

about two minutes after the last command or key-stroke has been entered. This

feature saves your rechargeable batteries for when they are needed.

Incoming serial (RS-232) commands or pressing the C-key will wake the PC-

Logger 3150.

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