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EXTECH

 

INSTRUMENTS

 

3

                                            

CTH10A

en

GB_V2.3

   

10/15

 

Operation

 

Getting

 

Started

 

Open

 

the

 

rear

 

battery

 

compartment,

 

insert

 

three

 

(3)

 

‘C’

 

type

 

batteries

 

observing

 

correct

 

polarity

 

and

 

then

 

close

 

and

 

secure

 

the

 

compartment

 

cover.

 

Press

 

the

 

Reset

 

button

 

(using

 

the

 

tip

 

of

 

a

 

paper

 

clip

 

or

 

pin)

 

in

 

order

 

to

 

initialize

 

the

 

meter.

  

Automatic

 

Time

 

Setting

 

 

After

 

inserting

 

the

 

batteries

 

and

 

resetting

 

the

 

unit

 

as

 

described

 

above,

 

the

 

clock

 

automatically

 

scans

 

for

 

the

 

WWVB

 

time

 

signal

 

and

 

the

 

icon

flashes

 

on

 

the

 

LCD.

 

 

flashes

 

Indicating

 

now

 

is

 

receiving

 

WWVB

 

signal

 

turns

 

on

 

Indicating

 

signal

 

received

 

successfully

 

 

disappears,

 

Indicating

 

signal

 

reception

 

failed

 

 

The

 

clock

 

automatically

 

synchronizes

 

with

 

the

 

WWVB

 

radio

 

signal

 

every

 

day

 

at

 

2am

 

to

 

maintain

 

accurate

 

time.

 

If

 

synchronization

 

with

 

the

 

signal

 

fails,

 

the

 

signal

 

icon

 

disappears;

 

the

 

clock

 

then

 

attempts

 

to

 

synchronize

 

with

 

the

 

WWVB

 

signal

 

at

 

3,

 

4,

 

and

 

5am.

  

 

The

 

clock

 

can

 

be

 

set

 

to

 

scan

 

the

 

time

 

signal

 

manually

 

by

 

holding

 

the

 

 

button

 

(B4)

 

for

 

3

 

seconds.

 

Note:

 

If

 

a

 

manual

 

scan

 

is

 

attempted

 

with

 

the

 

signal

 

icon

 

showing,

 

the

 

signal

 

icon

 

will

 

disappear

 

and

 

the

 

manual

 

scan

 

will

 

have

 

to

 

be

 

attempted

 

again.

 

Each

 

reception

 

takes

 

about

 

5

 

minutes.

 

If

 

reception

 

fails,

 

scanning

 

stops

 

and

 

the

 

signal

 

icon

 

disappears;

 

the

 

scan

 

then

 

repeats

 

on

 

the

 

next

 

full

 

hour

 

(e.g.

 

if

 

a

 

scan

 

failed

 

at

 

8:20am

 

a

 

scan

 

will

 

be

 

tried

 

again

 

at

 

9am).

 

 

Stop

 

scanning

 

by

 

holding

 

 

button

 

(B4)

 

for

 

3

 

seconds.

 

 

Note:

 

Buttons

 

will

 

not

 

function

 

while

 

scanning

 

for

 

the

 

WWVB

 

time

 

signal.

 

Manual

 

Time

 

Setting

 

 

In

 

the

 

time

 

display

 

mode,

 

hold

 

the

 

“MODE”

 

button

 

(B2)

 

for

 

3

 

seconds

 

to

 

enter

 

the

 

Clock/Calendar

 

setting

 

Mode.

 

 

Press

 

“+”

 

(B3)

 

or

 

 

(B4)

 

button

 

to

 

adjust

 

the

 

setting

 

and

 

press

 

the

 

“MODE”

 

button

 

(B2)

 

to

 

confirm

 

each

 

setting

 

and

 

move

 

to

 

the

 

next

 

setting.

 

 

The

 

setting

 

sequence

 

is

 

as

 

follows:

 

Hour,

 

Minute,

 

Second,

 

Year,

 

Month/Day

 

sequence,

 

Month,

 

Day,

 

DST.

 

Notes

:

  

1.

 

All

 

setting

 

modes

 

will

 

automatically

 

exit

 

after

 

15

 

seconds

 

of

 

inactivity.

 

2.

 

Press

 

and

 

hold

 

the

 

plus

 

or

 

minus

 

button

 

for

 

faster

 

scrolling

 

of

 

digits

 

while

 

editing.

 

3.

 

For

 

Time

 

Zones:

 

The

 

default

 

setting

 

is

 

zone

 

“P”.

 

Hold

 

“+”

 

(B2)

 

button

 

for

 

3

 

seconds

 

to

 

change

 

to

 

another

 

zone

 

“P”

 

“M”

 

“C”

 

or

 

“E”

 

Pacific,

 

Mountain,

 

Central,

 

and

 

Eastern.

 

4.

 

DST:

 

When

 

the

 

DST

 

function

 

is

 

activated

 

(Daylight

 

Saving

 

Mode)

 

“DST”

 

will

 

be

 

shown

 

on

 

the

 

LCD.

 

Set

 

‘DST’

 

as

 

described

 

in

 

the

 

Manual

 

Time

 

Setting

 

section

 

above.

 

 

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