Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 166)

APPENDIX A.

GLOSSARY

INTERMEDIATE

STORAGE:

That

portion

of

memory allocated

for

storing

the results of

intermediate

calculations

necessary for

operations, such

as averages

or standard

deviations. Intermediate

storage is not

accessible

to the

user.

LOW RESOLUTION:

This is

the default output

resolution. A low

resolution

data value has

4

significant

decimal

digits

and may

range

in magnitude

from

*0.001

to

*6999.

A

low

resolution data value requires

1

Final

Storage

location

(Section

2.2).

OUTPUT ARRAY:

A

string of

data

points

output

to Final

Storage.

Output

occurs only

when the Output

Flag is

set. The first

point

of

an

Output Array is

the Output

Array

lD,

which

gives

the

table and the Instruction

Location Number

of the instruction

which

sets the Output Flag.

The

data

points

which

complete the Array

are the result of

the

Output Processing

Instructions

which

are

executed

while

the Output Flag

is

set.

The

Array

ends when

the Output Flag is

reset at the end of

the table or when

another

instruction

acts upon the

Output

Flag. Output occurs

only when

the

Output

Flag

is

set.

OUTPUT INTERVAL:

The

time interval

between

initiation

of a

particular

Output

Array.

Output

occurs

only when

the

Output

Flag

is

set. The flag may

be set

at

fixed

intervals or in response

to certain

conditions

(Section

3.7).

OUTPUT PROCESSING

INSTRUCTIONS:

These instructions

process

data values and

generate

Output Arrays.

Examples

of

Output

Processing

Instructions

include

Totalize, Maximize,

Minimize,

Average, etc.

The data

sources for

these instructions are

values in Input

Storage.

The results of

intermediate

calculations

are stored in

Intermediate Storage.

The

destination of

data

generated

by Output

Processing

Instructions is Final

Storage.

The

transfer

of

processed

summaries

to Final

Storage

takes

place

when

the

Output Flag is set by

a

Program

Control Instruction.

PARAMETER: When

used in

conjunction with

21X instructions,

parameters

are numbers

or codes

which

are

entered when

programming

the 21X

to specify

exactly

what

the

instruction is

to do. Once the

instruction

number has been

entered in a

program

table, the

21X

will

prompt

for

the

parameters

by displaying

the

parameter

number in

the

lD Field

of the display.

PROCESSING INSTRUCTIONS:

These

instructions allow the user

to

further

process

input data

values

and return

the

result

to

Input Storage where it

can be

accessed

for

output

processing.

Arithmetic

and transcendental

functions

are included

in these instructions.

PROGRAM

CONTROL

INSTRUCTIONS:

These instructions are

used to modify the

sequence of execution of instructions

contained in

program

tables, and to set or

clear flags.

PROGRAM TABLE: That

portion

of

memory

allocated for

storing

programs

consisting of

a sequence

of user instructions which

control data

acquisition

and

processing.

Programming can be

separated into 2

tables,

each

having

its own execution

interval.

A third

table is

available for

subroutines which may be called

by

instructions

in

Tables 1

or 2.

The

*1

and

*2

Modes

are used

to access Tables

1 and 2.

The

*3

Mode

is

used to access

Subroutine

Table 3. The

length

of the

tables

is

constrained by

the total memory

available

for

programming

(Section

1.1). Table

1

execution has the

higher

priority;

it may

interrupt Table 2.

SAMPLE RATE:

The

rate at which

measurements

are

made.

The

measurement sample rate is

primarily

of

interest when considering

the effect of time

skew

(i.e.,

how close in

time are a series of

measurements). The maximum

sample

rates

are the

rates

at

which

measurements

are

made

when

initiated

by a single

instruction

with

multiple

repetitions.

A-2

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