Campbell 21X Instrukcja Operatora Pobierz pdf (Strona 102)

***

22 EXCITATION

WITH DELAY

***

FUNCTON

I

This instruction

is used

in conjunction

with

others

for

mfasuring a

response

to

a timed

excitation

using the switched analog

outputs. lt

sets the

selQcted excitation output

to a specific

value,

waits

for

the

specified time,

then turns off

the

excitatioth and

waits an additional

specified

time before

oontinuing

on

to

the

next

instruction

in the

progrqm

table.

The excitation on

time

can

be set

to zerp and the

off time delay

can be

used

if the

oply requirement is the

delay of

program

ex{cution.

PARAM.

NUMBER

01:

02:

03:

o4;

Input locati

ATA

YPE

***

23

BURST

MEASUREMENT

***

FUNCTION

Instruction

2g

witt repeatedly make

a

voltage

measuremeht

on a series

of

single-ended

or

differential

dhannels,

applying excitation

if

desired.

Thb

measurement

units

are

millivolts

prior

to

scaling. The

measurements

saved can

be those

m4de immediately upon

execution of

the

instructiOn

or

grouped

around

a specified

trigger

condition.

The

results of the

measuremehts

may be stored

in Input

Storage

or the

raw

AUD

data

can be sent

out the

serial

port.

The

minimum

sample time

per

channel is

970ps

(i.e.,

one

channelcan

be

sampled at a

maximum

rdte of

1030 Hz).

MEASUREMENT

The

voltaqg measurement

must use

the fast

integration

of

250;rs. Differential

are

made with a single

integration.

ended

or a

integration

The noise

level on a

fast single-

DESCRIPTION

Excitation channel

number

4

Delay time

in hundredths

of a second

that

.excitation

is

on

4

Delay time

in hundredths

of

a

second

after

excitation

is turned off

FP

Excitation voltage

in

millivolts

s altered:

0

measurement

with 1

SECTION

9.

INPUT/OUTPUT INSTRUCTIONS

and

greater

voltage ranges

are

practical

(range

codes

13-15).

Excitation

is always

supplied

from excitation

channel

1. The

excitation

voltage in millivolts is

entered

in Parameter 9.

lf

excitation

is

not

needed,

enter

0

for Parameter 9.

TRIGGER

Measurements may

be triggered either

by the

value of the

measurement on

the

first

channel

being

measured

or

by an

externaldigitaltrigger.

Three

options are available. Only

one

trigger

can be

used.

Three options are

available

for

the

first digit in

Parameter

4.

0

-

Trigger

on

the first measurement

channel.

1

-

Digitaltrigger on single-ended'channel

one

(1H).

2

-

Trigger

on the

first measurement

channel, set

Digitalcontrol

port

high

when

trigger

is

met

and

low when

measurements

have

f inished.

When triggering on

options 0 or

2, the

measurement on the

first specified channel

(Parameter

3) is compared to the

limit

specified

in Parameter 8.

The user's

multiplier and offset

are

not

applied

before the comparison:

the limit

must be entered

in millivolts. lf a digital

trigger

(CMOS

levels, low

<

1.5V,

high

>

3.5V) is

used,

it must be input

into single-ended

Channel

1

(1H).

The digital trigger

condition

is checked

at the

start

of

each

scan.

Five trigger

options are available

and are

selected

by the number

entered as the

second

digit

in Parameter

4: 0

-

trigger

immediately,

start

saving

or

sending

data

with the

first

measurement made;

1

-

trigger

if

the

measurement

is

greater

than

the

limit

entered or

if

the

digital

trigger is high; 2

-

trigger

if the

measurement

is less than

the limit or

if the

digital

trigger

is low; 3

-

trigger on

rising

edge;

i.e., when

the measurement

goes

from below to

above

the

limit

or

when the digital

trigger

goes

from low

to high; 4

-

trigger on

falling

edge; i.e.,

3pV

RMS.

Thus, only

the 50mV

9-9

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 190 191

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