Campbell 21X Instrukcja Operatora Pobierz pdf (Strona 96)

mentioned

correct this

391 B/392D

anywhere

one

second too short

to

almost twice

long.

Pulses

are

not lost during

so totalized

values

are correct

but

pulse information such as

wind speed

twice the correct

value.

The

can

be

discard

from excessive

intervals option

the

previous paragraph

does not

in 21Xs with

PROMs

earlier.

The

options

pf

discarding

counts

from

long

intervals,

pulpe

input

type, outputting

frequency,

and using a

$ixteen

bit counter

are selected by

the code

entbred

for the

fourth

parameter

(Table

9-2).

NOTE:

f,ll

pulse

count

instructions

must be

ikept

in

the

same table.

lf the

pulse

cofrnt instruction

is

contained

within a

bubroutine.

that subroutine

must beicalled

from

Table 2.

Codes

Configuration

High frequency

pulse

Low levelAC

Switch closure

High frequency

pulse,

sixteen bit

counter

Low levelAC,

sixteen bit

counter

Long

interval

data

discarded,

where X is configuration

code

Long

interval data discarded,

frequency

(Hz)

output

PARAM.

DATA

NUMBER irYPE

DESCRIPTION

Repetitions

Channel

number

for first

measurement

Configuration

code

(from

above

table)

Input location

for first

measurement

Multiplier

Otfset

SECTION

9.

INPUT/OUTPUT

INSTRUCTIONS

***

4 EXCITE,

DELAY, AND

MEASURE

***

FUNCTION

This

instruction is used

to apply an

excitation

voltage,

delay a specified

time, and

then make

a

single-ended

voltage

measurement.

A

1

before

the

excitation channel

number

(1X)

causes

the

channelto

be

incremented

with

each

repetition.

PARAM.

DATA

NUMBER

TYPE DESCRIPTION

2

Repetitions

2

Range code

2

lnput

channel

number for

first

measurement

2

Excitation channel

number

05:

4

Delay in hundredths

of a

second

06:

4 Excitation

voltage

(millivolts)

4

Input location

number for

first measurement

FP

Multiplier

FP Offset

Input

locations altered:

1

per

measurement

***

5

AC HALF BRIDGE

'**

FUNCTION

This

instruction is used

to

apply

an

excitation

voltage

to a half bridge

(Figure

13.5-1), make a

single-ended

voltage

measurement

of the bridge

output,

reverse the

excitation

voltage,

then

repeat the

measurement.

The result

of

lnstruction

5 is the

ratio of

the

measurement

to

the excitation

voltage.

A 1

before

the

excitation

channel

number

(1X)

causes the

channel to

be

incremented

with each

repetition.

The

excitation

"on

time"

for

each

polarity

is

exactly the

same to

insure

that

ionic sensors

do

not

polarize

with

repetitive measurements.

The

range

should be selected

to be a

fast

measurement

(range

11-15), limiting

the

excitation

on time

to 800 microseconds

at each

polarity.

A slow integration

time should

not be

used

with

ionic

sensors

because

of

polarization

error.

01:

o2:

03:

o4:

07:

08:

09:

Code

0

1

2

3

4

1X

2X

01:

Q2:

03:

04:

05:

06:

2

2

2

4

FP

FP

lnput locations altered:

1

per

measurement

9-3

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 190 191

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