Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 52)

OPERATING

TEMPERATURE

LIMITATIONS

The cassette recorder

is recommended

for

use

in an envirohmental

operating

temperature

range of 0'tro

+40"C.

Temperatures below 0"C

may cause

@pe

speed

variation

in

excess

of

that

which cfn be tolerated

during

playback.

Data Recorded

with the

RC35 outside

the

0'C

to

40'C

ranEe

may be

unreadable.

VOLUME CONTROL

When

recor{ing data, the

RC35's

volume

setting

does

not

m{tter.

The

recorder is equipped

with

an

automatit

gain

controlwhich

controls the

recorded

si$nal

level.

For

playback,

a mid

range

volume

settifrg

is normally

required.

CASSETTE

TAPES

Normal biaq,

high

quality

cassette

tapes

are

recommendEd for use

with the

recorder. The

more expensive

high

bias

chromium oxide

tapes

will

NOT

pefiorm

satisfactorily.

Although

the

use of

C-90

tapes

is

generally

successful,

Campbell Sfientific

recommends

the

use of C-

60

(30

minufles

per

side) cassettes.

TDK,

Maxell,

and equivalent

quality

cassette tapes

perform

well and are

readily

available. Bargain-

priced

tapeg

have often

performed

poorly

and

are

not

recommended.

New tapes

4re

often

tightly

wound,

creating

enough drag or

pressure

to cause the tape

recorder

to

fpop"

out

of the

record mode.

This

potential

loEs of data

may be

overcome by fast-

forward/rewinding

the entire

tape before

placing

it in

service.

4.3.2 CASSE1TE CONNECTOR

INTERFACE

CABLES ]

A Cassette

fnterface

Cable

is required

to

connect thelcassette

recorder to

the

21X.

Two

models are

lavailable.

The SC92A

is

a

WRITE

ONLY

inter{ace.

The SC93A

READ A/RITE

SECTION

4.

EXTERNAT

STORAGE

PERIPHERALS

interface is only

necessary

if the 21X has

special software

for transferring

programs

via

tape

(Appendix

B).

The SC92A

and

SC93A

have a combination

backshell

circuit

card

and 9-pin

connector which

attaches to the serial

l/O connector on

the 21X.

The SC92A has two

plugs

which

connect

to

the

POWER

and

MIC

jacks

on

the recorder.

The

SC93A has three

plugs

which connect to the

POWER, MIC

and

EAR

(or

MONITOR)

jacks

on

the

recorder.

Both

cables transform

12V from

the 21X

to

6V to

power

the

recorder

during

periods

of data transfer.

Additional

circuitry

shapes the data

signalwaveform.

4.3.3 TAPE FORMAT

Data tapes

generated

by the

21X

are read by

the

PC201

tape

read card

for the

IBM

PCD(T/AT

or by

the C20

Cassette

Interface. The C20

decodes

the

tape and transmits

the data

in

ASCII via a standard

RS232

interface.

TABLE 4.3-2. Format

2 Specifications

l

I

I

I

I

I

I

POWER

SUPPLY

I

The 21X's irjternal

power

supply

will

power

the

recorder

durf

ng

periods

of data transfer,

but will

NOT be avaflable to

play,

advance, or

back-up

tapes.

In

orfer

to

perform

these

functions

during

setup and check-out

operations, the

recorder reqpires

4 alkaline

AA batteries or the

120

VAC

adhpter.

Data

Low

Resolution

High Resolution

C-60 Capacity

(Lo

Res.)

Data

Transfer

Rate

(Lo

Res.)

Block

Size

locations

Binary

2 bytes/data

point

4

bytes/data

point

180,000

data

points

(1

side

only)

100 data

points/sec.

512

FinalStorage

4.3.4 CONNECTING

TAPE

RECORDER TO

21X

The

procedure

for setting

up the 21X and

cassette recorder

for transfer

to

tape

is as

follows:

1.

Load a cassette

in the

recorder

and

advance

the

tape forward

until

the

tape

leader

is

past

the

recording head.

(lnternal

batteries

or AC

power

required.)

2.

Connect the

SC92A or

SC93A to the 9-pin

serial

l/O

port.

4-5

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