David White DWT-10 Instruction Manual

®

DWT-10

Instruction Manual

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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

© David White 2002. All Rights Reserved
August 2002

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

1

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

2

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.

3

1. NOMENCLATURE AND FUNCTIONS

1.1 Nomenclature

4

1.2.1 Display

DISPLAY FUNCTION

V

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)

HR Horizontal angle counterclockwise symbol

H L

Horizontal angle clockwise symbol

Battery strength symbol

(See section 4, power)

Angular measurements are in gons

(See section 1.2.3, preference set up)

G

%

Vertical reading shown as percent of grade

(see section 1.2.3, preference set up)

1.2 Part Functions

R L V %

HOLD OSET

V

-8.8.8.8.8.8.8.

H

RL

8.8.8.8.8.8.8.

G

R L V %

HOLD OSET

V

H

R

0.0.0.0.0.0.0.