Campbell 21X Manuel de l'opérateur télécharger pdf (Page 27)

SECTION

1. FUNCTIONAL

MODES

1.1

TABLES

-*1,*2,

AND

*3

MODES

Data acqu

and

processing

functions are

controlled

b]l

instructions contained

in

program

tables.

can

be

separated

into

2

tables, each

having its own

programmable

execution

inlerval.

A third table

is available

for

programming

subroutines

which may be

called

interrupt.

access

T

*1

and

*2

Modes are

used to

'l

and

2.

The

"3

Mode

is used to

access

Table

3.

When

a

table

is first

entered,

the

display

the

table

number in the

lD

Field

and

00

in

Data Field.

Press A and the 21X

will to the execution

interval.

lf

there

is

an existing

instruction

in the

table, enter

an

number

prior

to

A and

the

21X

will

directly

to

the instruction

(e.9.,

5 will

to

the

fifth

instruction

in the

table).

INTERVAL

The

interval is entered

in units of

seconds

as

0.0125....

1 seconds,

in

multiples of 0.0125

0.1 .....655q

seconds,

in multiples

of 0.1

second

Intervals

leds than 0.1

second are

allowed in

Table 1 onlf. Execution

of the table

is

repeated

at the

rate

(etermined

by

this entry.

The

table

will

not

be

dxecuted

if 0

is entered.

Values less

than 0.1

ard

rounded to

the nearest

even

multiple

of

0.0125.

lf the

Interval

is 0.1 or

greater,

the

21X will not

allow

entry

of digits

beyond

0.1.

The

sample

rate for a

21X measurement

is the

rate

at

which the measurement

instruction

can

be executed

(i.e.,

the

measurement

made,

scaled

with the

instruction's

multiplier

and offset,

and the

resUlt

placed

in

lnput

Storage).

Additional

processing

requires extra

time.

The

throughput

fate

is the

rate at

which a

measurem{nt

can

be

made and

the

resulting

value stored

in

Final

Storage.

The maximum

throughput

]rate

for

fast single

ended

measurem$nts

(other

than

with

the burst

measurement)

is 256

measurements

per

second

(16

measurements

repeated 16 times

per

second).

lf

the

specified execution

interval for a

table is

less than

the time

required to

process

that table,

the

21X overruns

the

execution

interval,

finishes

processing

the table and

waits for

the next

occurrence

of the

execution

interval

before

again

initiating the table

(i.e.,

when the

execution

interval

is up and the

table

is

still

executing,

that execution

is skipped).

Since

no

advantage

is

gained

in the rate

of execution

with

this

situation,

it

should

be avoided

by

specifying

an execution

interval

adequate

for the table

processing

time.

NOTE: Whenever

an overrun

occurs, decimal

points

are

displayed

on

both

sides

of the

sixth digit

of the

21X display

(e.9.,

L O.G. in the

*0

Mode).

When the

Output Flag

is

set

high,

extra

time

is

consumed

by final output

processing.

The

execution

interval

may be exceeded

at this time

only,

which may

be acceptable.

For example,

suppose

it is

desired

to

measure every 0.1

seconds

and output

processed

data every ten

minutes.

The

processing

time

of the

table is

less than

0.1 seconds

except

when output

occurs

(every

10 minutes).

With

finaloutput

processing

the time

required

is 1 second.

With

the execution

interval set at 0.1

seconds,

and a

one second

lag between samples

once every

10

minutes,

10 measurements

out

of 6000

(.17o/o)

are

missed: an

acceptable statistical

error

for

most

populations.

1.1.2

SUBROUTINES

Table

3 is used to

enter subroutines

which may

be called

with Program

Control

Instructions

in

Tables

1 and 2 or

other subroutines.

The

group

of

instructions

which

form

a

subroutine starts

with lnstruction

85,

Label Subroutine,

and ends

with Instruction

95,

End.

(Section

12)

1.1.1

1-1

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