Campbell 21X Manual do Operador descarregar pdf (Página 94)

SECTION

9. INPUT/OUTPUT

INSTRUCTIONS

TABLE 9-1. Input

Voltage

Ranges

and

Codes

Range Code

Slow

Fast

16.67ms

250ps

Integ.

Integ.

FullScale Range

Resolution

1

2

3

4

11

12

13

14

t5

millivolts

+15

millivolts

t50

millivolts

t500

millivolts

t5000

millivolts

0.33

microvolts

1. microvolts

3.33

microvolts

33.3

microvolts

333.

microvolts

5t*

15*"

'

Differential measurement;

resolution for single-ended

measurement

is

twice

value shown.

**

The lhtegration times

for

ranges

5 and

15 are

1.67ms

and

251ts

respectively.

: When a

voltage

input

exceeds

the

range

programmed,

the

value which is

is set to the

maximum negative

number

and displayed

as

-99999

in high

or

-6999

in low

resolution.

01:

02:

03:

***

1 SINGLE.ENDED

VOLTS

**'

FUNCTION

This

instruction is used

to

measure

voltage

at

a

single-

endep

input with

respect to

ground.

Standard

O(ttput

(multiplier

=

1, offset

=

0)

is in

millivolts.

PARAM.

DATA

NUMBER WPE

DESCRIPTION

2 Repetitions

2 Range

code

2 Channel

number for first

measuremenl

4

Input

location

for first

measuremenl

FP Multiplier

FP

Offset

Input

locatidns altered:

1

per

measurement

***

2

DIFFERENTIAL

VOLTS

*'*

FUNCTION

This

instruclion

reads the

voltage

difference

between

thQ

high

and

low

inputs of

a

differential

channel.

T4ble 9-1 contains

allvalid voltage

ranges

and

ltheir

codes.

Both the

high

and

low

inputs

mustlbe within

tSV

of

the 21X's

ground

(see

Commpn

Mode Range

in

Section 13.2).

Pyranometer and thermopile

sensors

require a

jumper

between

LOW and GROUND

to

keep

them in Common

Mode Range. Standard

Output

(multiplier

=1,

offset

=0)

is

in millivolts.

PARAM.

DATA

NUMBER

TYPE

DESCRIPTION

Repetitions

Range code

Channel

number

lor

first

measurement

Input location

for first

measurement

Multiplier

Offset

Input

locations

altered:

1

per

measurernent

***

3 PULSE COUNT

*"*

There

are

three

pulse

input

types

which

may be

measured with the

Pulse

Count

Instruction.

HIGH FREQUENCY

PULSE

In this

configuration,

the minimum

detectable

pulse

width

is

2 microseconds

i.e. the

maximum

frequency is 250

kHz

with

a 5Oo/o

duty cycle.

The 8 bit counter

has a

maximum

input

frequency

of

2550

Hz and

the

16 bit option

a

maximum of 250

kHz.

2

2

2

4

FP

FP

01:

02:

03:

o4:

05:

06:

04..

05:

06:

9-1

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 190 191

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