David White DWT-10 Manuel utilisateur

DWT-10

Instruction Manual

For Customer Service

Call (781) 848-7702 or

Fax (781) 848-8022

Congratulations on your choice of this David White® Electronic Digital Transit. We

suggest that you read this instruction manual carefully before using the instrument. By

thoroughly familiarizing yourself with the instrument and its operation, you will be able

to obtain the full benefit of this superior precision instrument. Save this instruction

manual for future use.

CONTENTS

BEFORE YOU USE .................................................................................................... 1

WARRANTY INFORMATION .................................................................................... 2

1. NOMENCLATURE and FUNCTIONS. ..................................................................... 3

1.1 Nomenclature ......................................................................................................... 3

1.2 Part functions .........................................................................................................4

1) Display ................................................................................................................... 4

2) Operating keys .....................................................................................................5

3) Setting up your measuring Preferences ...................................................... 6

2. PREPARATIONS for MEASUREMENT .................................................................. 8

2.1 Mounting and leveling .......................................................................................... 8

2.2 Telescope eyepiece focus ..................................................................................... 9

2.3 Aiming at the target ............................................................................................ 10

3. MEASUREMENT ................................................................................................ 10

3.1 Power ..................................................................................................................... 10

3.2 Measuring horizontal angles ............................................................................. 11

3.3 Presetting horizontal angles ............................................................................. 11

3.4 Measuring vertical angles ................................................................................... 11

3.5 Measuring percent of grade .............................................................................. 11

3.6 Stadia measurement ........................................................................................... 12

3.7 Displayed Error Codes ......................................................................................... 12

4. HANDLING of POWER SUPPLY .......................................................................... 13

4.1 Removing battery compartment ...................................................................... 13

4.2 Replacing batteries .............................................................................................. 13

4.3 Mounting battery compartment ...................................................................... 13

5. CHECKS and ADJUSTMENTS ............................................................................. 14

5.1 Adjustment precautions ..................................................................................... 14

5.2 Checking and adjusting ...................................................................................... 14

1) The plate vial ...................................................................................................... 14

2) The circular vial ..................................................................................................14

3) The optical plummet ........................................................................................ 15

5.3 Setting the Vertical Zero Position ..................................................................... 15

6. TRIBRACH .......................................................................................................... 16

7. ACCESSORIES .................................................................................................... 16

8. HANDLING PRECAUTIONS ................................................................................. 16

9. SPECIFICATIONS ............................................................................................... 17

August 2002

Information contained in this publication is subject to change without notice.

This quality David White®instrument has been inspected twice for accuracy before

leaving the factory. The instrument has also been given the best protection possible

against damage during transportation. Even with these precautions, the instrument is

subject to rough handling during shipment. To protect yourself against the possibility

of using an instrument which is out of adjustment, we suggest that you have the

instrument checked by a competent person before using it.

Note: Please read the manual thoroughly before starting the following test.

The following test can be performed to check the instrument’s accuracy:

Set up the instrument in an area that is about 220 feet long and as level as possible.

Place two matching level rods (or drive two pieces of strapping into the ground) about

200 feet apart with the faces toward each other. Position and level the instrument so

that the distance from the instrument to each rod is the same

(measure; Fig. 1).

Take a reading on each rod with the instrument (or mark each piece of strapping where

the crosshair is sighted). Note the difference and record them. Next, move the

instrument to another point in line with the two level rods as shown in Fig. 2. Level the

instrument and take readings on the two level rods (or re-mark the two pieces of

strapping with the new crosshair sightings). The differences should be the same ( A - A'

should equal B - B'). The difference between A - A' and B - B' is the instrument error at

200 feet.

Correction of instrument error should be performed by a competent repair technician.

The instrument should be rechecked periodically to assure continued accuracy.

IMPORTANT!

READ THIS BEFORE USING YOUR INSTRUMENT

WARRANTY

David White®(Seller) warrants the equipment of its manufacture to be free of defects

in workmanship and material for a period of one year from date of purchase. If within

such one year period the original purchaser (Buyer) notifies Seller, in writing, that the

equipment purchased in not as warranted, and provides a bill of sale, receipt, or other

proof as to date of purchase, Seller will, at Seller's option, adjust, repair or replace the

whole or any part of the equipment which seller finds to be defective, provided:

A. The equipment is returned transportation prepaid to Seller or its designated

warranty service center.

B. The equipment is in original condition excepting only ordinary wear resulting from

normal usage.

C. The Seller has received prompt written notification and substantiation that the

equipment has been stored, installed, operated and maintained in accordance with

the recommendation of the manufacturer and has not been subjected to service by

other than Seller or an authorized service center.

Warranty service does not include cleaning, oiling, or adjustment of the equipment

unless required as a result of a workmanship or material defect in the equipment. If,

upon examination of the equipment, the Seller determines that such cleaning, oiling,

or adjusting is required other than by reason of the warranty claim, Seller shall notify

Buyer of the charges for same and after authorization is received from Buyer, Seller

shall perform such additional service(s) on behalf of the Buyer at its standard charges

then in effect and the Buyer shall be responsible for the payment of such charges in

addition to the other charges and expenses referred to above. In all cases, Buyer is

responsible for transportation charges for return of goods from Seller to Buyer.

Seller's liability to Buyer (whether in contract or in tort) arising hereunder or as a result

of any claimed defect or for any other cause, is hereby expressly limited to correcting

the equipment upon the terms and conditions stated above. All liability hereunder shall

terminate upon expiration of the applicable warranty period. In no event shall Seller be

liable for any loss, expense, or damages direct, indirect, consequential, or special arising

from the sale or use of the equipment delivered hereunder.

The foregoing warranty states seller's full liability in connection with the purchase of

this equipment, accessories, and parts and is in lieu of and supersedes any and all other

warranties and representations, if any, express or implied, including merchantability or

fitness for purpose, and shall be void if repairs have been made or attempted by

persons other than seller's factory personnel or designated authorized service center.

This warranty is not transferrable.

1. NOMENCLATURE AND FUNCTIONS

1.1 Nomenclature

1.2.1 Display

DISPLAY FUNCTION

Vertical angle symbol

will be shown in place of the vertical reading until the telescope

has been turned past the zero point of the horizontal axis. This

sets the zero point.

(See section 1.2.3, preference set up)

HRHorizontal angle counterclockwise symbol

H LHorizontal angle clockwise symbol

Battery strength symbol

(See section 4, power)

Angular measurements are in gons

(See section 1.2.3, preference set up)

%Vertical reading shown as percent of grade

(see section 1.2.3, preference set up)

1.2 Part Functions

R L V %

HOLD OSET

-8.8.8.8.8.8.8.

RL8.8.8.8.8.8.8.

R L V %

HOLD OSET

0.0.0.0.0.0.0.

1.2.2 Operating Keys

KEY SYMBOL FUNCTION OPERATION

Setting horizontal

angle rotational

direction

R/L

Used to switch horizontal angle

between clockwise rotation (HR) and

counterclockwise rotation (H L).

The direction changes each

time the button is pressed.

HOLD Locking horizontal

angle reading

Used to lock current horizontal angle

into display. The horizontal angle

reading will flash when this button

is pressed. The instrument can be

turned without changing the

horizontal reading. Pressing the

button again will unlock the

horizontal angle display.

Used to light the display and

crosshairs. Press to light display and

crosshairs, press again to shut off the light.

Illuminating the

display and the

crosshairs

V% Vertical angle to

percent of grade

Used to switch the vertical angle

display between degrees/gons and percent

of grade. The “%” sign will be

shown on the display when percent

of grade is active.

Used to zero the reading of the

horizontal angle display. Press to

zero the reading at any point.

Zero the horizontal

angle reading

0SET

Power ON/OFF Used to turn the display on and off

0SET

Change the zero points and angle

pattern of the vertical circle. The

three modes are Ua, Ub and UC.

The following diagrams show the

different vertical measurement

modes.

10 360

b 0 UC

1.2.3 Setting Up Your Measurement Preferences

A) Turn the power on.

B) Press “R/L” and “V%” at the same time.

A tone will be heard and the display

should look similar to what’s shown at

right.

C) To specify your measurement preferences:

PRESS TO DISPLAY

R/L

Change the readout of the

horizontal and vertical angle

display to show 10 second or 20

second readings. (The accuracy of

this instrument is 20 seconds, not

10 seconds. Changing the

readout does not make the

instrument more accurate.)

Change between 360 degree

readout or 400 gon readout for

horizontal and vertical angle

measurement.

HOLD

Change the time of automatic

power shut off for the display.

The three modes are

“0”, no auto power off

“20”,20 minute auto power off

“30”,30 minute auto power off

20 360

0UC

10 360

b 0 UC

10 360

b 0 UC

10 360

b 0 UC

Change between hearing a tone or

not when the horizontal angle reads

0º, 90º, 180º, 270º 10 360

b 0 UC

1.2.3 Preferences continued

Once all preferences have been input, press the “H/R” and “V%” at the same time. A

long tone will be heard and the display will return to normal.

2. PREPARATION FOR MEASUREMENT

2.1 Mounting And Leveling

Mount and level the instrument carefully to get the best performance.

1. Place the tripod over the ground datum point and tighten the legs.

2. Attach the instrument to the tripod and tighten snugly

3. Roughly level the instrument with the circular vial

4. Fine tune level the instrument with the plate level:

C) Repeat steps A and B until the level stays centered in any direction. If the plate level

will not stay centered, see section 5.2 to adjust the vial.

A) Use level screws “A” and “B” to

move the air bubble in the circular

vial so it is centered left to right.

B) Use level screw “C” to move the air

bubble to the center of the vial.

A) Turn the instrument until the plate

level is in either one of the positions

shown. Then use the “A” and “B” level

screws to center the bubble in the

level.

B) Turn the instrument 90°(100 g)

and center the air bubble in the vial

using level screw “C”.

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