Campbell 21X Instrukcja Operatora Pobierz pdf (Strona 97)

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SECTION

9. INPUT/OUTPUT

INSTRUCTIONS

PARAM.

DATA

NUMBER TYPE

DESCRIPTION

Repetitions

Range

code

Input

channel number for

first measurement

Excitation

channel

number

Excitation

voltage

(millivolts)

Input

location number

for

first measurement

Multiplier

Offset

Input

locations altered: 1

per

measurement

***

6 FULL BRIDGE

***

FUNCTION

This

instruction is

used to apply

an excitation

voltage

to a

full

bridge

(Figure

13.5-1), make

a

differential voltage

measurement

of

the

bridge

output,

reverse the

excitation

voltage,

then

repeat

the

measurement. The

result is 1000

times

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.

PARAM. DATA

NUMBER

TYPE

DESCRIPTION

Repetitions

Range

code

Input channel number for

first measurement

Excitation

channel

number

Excitation

voltage

(millivolts)

Input location number

for

first measurement

Multiplier

Offset

Input

locations

altered:

1

per

measurement

***

7

THREE

WIRE HALF

BRIDGE

***

FUNCTION

This

instruction is

used to determine

the

ratio

of

the

sensor

resistance

to

a known

resistance

using

a separate voltage

sensing wire from

the

sensor

to

compensate

tor

lead

wire

resistance.

9-4

The measurement

sequence is

to

apply

an

excitation

voltage,

make two voltage

measurements

on

two

adjacent

single-ended

channels,

the first on the reference resistor

and

the

second on the voltage

sensing

wire

from

sensor

(Figure

13.5-1),

then reverse the

excitation voltage

and

repeat

the

measurements. The two measurements

are

used

to

calculate

the

resulting

value, which is

the ratio of the voltage across

the

sensor

to the

voltage

across the reference resistor. A 1

before

the

excitation channel number

(1X)

causes the channelto be incremented with

repetition.

PARAM.

DATA

NUMBER TYPE DESCRIPTION

2 Repetitions

2 Range

code

for

both

measurements

Input

channel number for

first measurement

2 Excitation

channel

4 Excitation

voltage

(millivolts)

Input location number

for

first measurement

FP Multiplier

FP

Otfset

Input locations altered: 1

per

measurement

***

8

DIFFERENTIAL VOLTAGE WITH

***

EXCITATION

AND DELAY

FUNCTION

This measurement

consists of applying

a

single

excitation voltage,

delaying a specified time,

making a differential voltage

measurement. lf a

0

delay

is specified, the inputs

are

not

switched

for

a second integration as is normally the

case

with

a differential measurement

(Section

13.2).

The

result stored is the

voltage

measured. W

a delay

of

0 lnstruction 8 does not have as

resolution

or common mode rejection as

the

ratiometric

bridge measurement instructions. lt

does

provide

a very rapid means

of

making

bridge measurements

as

well

as supplying

excitation to

ci

rcu itry requ i ri

n

g

d iff erential

measurements. This instruction

does

not

reverse excitation.

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