dgt10 cover 2/02

dgt10 cover 2/02
®
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
© David White 2002. All Rights Reserved
August 2002
Information contained in this publication is subject to change without notice.
IMPORTANT!
READ THIS BEFORE USING YOUR INSTRUMENT
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.
1
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.
2
1. NOMENCLATURE AND FUNCTIONS
1.1 Nomenclature
3
1.2 Part Functions
V -8.8.8.8.8.8.8.G
HRL 8.8.8.8.8.8.8.
RL
V%
HOLD OSET
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.
V
RL
V
V%
HOLD OSET
HR 0.0.0.0.0.0.0.
(See section 1.2.3, preference set up)
HR
H
L
Horizontal angle counterclockwise symbol
Horizontal angle clockwise symbol
Battery strength symbol
(See section 4, power)
4
G
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)
1.2.2 Operating Keys
KEY SYMBOL
FUNCTION
OPERATION
Setting horizontal
angle rotational
direction
Used to switch horizontal angle
between clockwise rotation (HR) and
counterclockwise rotation (H L).
The direction changes each
time the button is pressed.
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.
Illuminating the
display and the
crosshairs
Used to light the display and
crosshairs. Press to light display and
crosshairs, press again to shut off the light.
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.
0SET
Zero the horizontal
angle reading
Used to zero the reading of the
horizontal angle display. Press to
zero the reading at any point.
Power ON/OFF
Used to turn the display on and off
R/L
HOLD
5
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.
20
360
0
UC
C) To specify your measurement preferences:
PRESS
R/L
V%
HOLD
0SET
TO
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.
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
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.
Change between hearing a tone or
not when the horizontal angle reads
0º, 90º, 180º, 270º
DISPLAY
10
b
0
10
b
b
0
UC
360
0
10
b
UC
360
10
UC
360
0
10
b
6
360
UC
360
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.
7
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
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.
4. Fine tune level the instrument with the plate level:
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”.
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.
8
5. Centering the instrument using the optical plummet
A) Adjust the eyepiece so the bull's-eye
reticle comes into sharp focus.
B) Adjust focus knob so ground target comes
into sharp focus.
C) Slightly loosen the tripod fastening
screw and move the instrument until the
ground target is centered in the optical plummet.
D) Tighten the tripod fastening
screw and recheck the level
vials by following steps 3 and 4 again.
2.2 Telescope Eyepiece Focus
Point the telescope toward a bright area and turn the telescope eyepiece until the
crosshairs come into sharp focus.
Avoid parallax, the shifting seen between the target and the crosshairs when your eye
moves while sighting through the telescope. Parallax will cause inaccurate measurements.
To avoid parallax, perform the following:
1. Focus the telescope on a target.
2. You should be able to move your eye up and down or left and right without
seeing the target shift with respect to the crosshairs.
3. If there is parallax, readjust the eyepiece.
Always remove any parallax before operation to assure accurate measurements.
9
2.3 Aiming At The Target
Loosen the clamps and point at
the target using the targeting
sights located above and below
the telescope.
Allow some space between your
eye and the targeting sight.
3. MEASUREMENT
3.1 Power
1. Turn the power on. All
segments of the display will
light for 2 seconds.
2. The vertical reading will then
be shown as
, which
stands for “SET”
3. Rotate the telescope to set
the vertical “0” point. This is
done to cause the zero pointer
to pass a sensor and start
vertical angle measurement.
4. Check battery power:
Full, partial and low power,
measurement is possible.
No power, no measurement
possible; replace the batteries.
V -8.8.8.8.8.8.8.G
HRL 8.8.8.8.8.8.8.
RL
HOLD OSET
RL
V
V%
V%
HOLD OSET
HR 0.0.0.0.0.0.0.
V
HR
Full
Power
900000 G
00000
Partial
Power
Low
Power
RL
V%
HOLD OSET
No
Power
Note: Battery operating time will vary depending on type and brand and operating
temperature. Be sure to keep an extra set of alkaline type AA batteries in the carrying
case. For any other questions about the batteries, see section 4.
10
3.2 Measuring Horizontal Angles
1. Aim at target “A”
2. Press “0SET” key to zero out
horizontal angle reading, HR 0°00'00".
3. Aim at second target, “B”, and
the angle between “A” and “B”
will be displayed, HR 30°15’00".
“HR” shown on the display means that the horizontal angle reading increases as you
turn the instrument clockwise.
“H L” shown on the display means that the horizontal angle reading increases as you
turn the instrument counterclockwise.
3.3 Presetting Horizontal Angles
1. Turn the instrument until the desired horizontal angle is shown on the display.
HR 60°00’00"
2. Press the “HOLD” button. HR 60°00'00" will blink on and off.
3. Aim the instrument at the target and press the “HOLD” button again. The horizontal
angle will be released from that point. HR 60°00'00" will be the start point for horizontal angle measurement.
3.4 Measuring Vertical Angles
There are three different vertical scales to choose from when measuring vertical
angles. See the three scales in section 1.2.3., performance setup. Choose the vertical
angle mode you wish to use from among the performance setup choices.
3.5 Measuring Percent Of Grade
By pressing the “V%” key, you
can switch from vertical angular
measurement shown in degrees
to percent of grade shown as 0
to 100% slope. The “%” symbol
will be seen on the display next
to the vertical reading when
in this mode.
V%, percent of grade:
Any vertical angle exceeding 100%
will be shown as "----" on the display.
11
3.6 Stadia Measurements
1. Distance measurement
can be done using the
stadia hairs of the reticle.
2. Read the length " l " of a
level rod shown between
the stadia hairs.
3. The distance to the target is 100
multiplied by " l ". The distance between
point A and point B is L.
L=100 x " l "
3.7 Displayed Error Codes
DISPLAY
E01
CAUSE
PRESS TO
CLEAR
ERROR
Instrument spun horizonitally at too
great a speed for the horizontal detector.
OSET
E02
Telescope spun vertically at too great a
speed for the vertical detector.
V%
E03
Error in the vertical angle measurement
system. Re-start the instrument.
2X
If error is still shown, return instrument for repair.
E04
Error in the horizontal angle measurement
system. Re-start the instrument
2X
If error is still shown, return instrument for repair.
E06
12
Error in the setting of the vertical zero point.
Return instrument for repair.
N/A
4. HANDLING OF POWER SUPPLY
4.1 Removing The Battery Compartment
Push down on the battery compartment latch
and pull the top of the battery compartment
away from the instrument.
4.2 Replacing Batteries
1. Push down on the hook to remove
the metal battery door.
2. Install batteries as shown.
3. Slip the projection
shown on the metal
battery door into the slot
shown and push down on
the door until the hook
locks the door in place.
4.3 Mounting Battery Compartment
1. Slip the projection on the bottom of the battery
compartment into the slot .
2. Push the top of the battery compartment
toward the housing until the battery compartment
latch clicks into place.
13
5. CHECKS AND ADJUSTMENTS
5.1 Adjustment Precautions
When attempting to check and adjust an instrument, corrections must be done in a
certain order or the adjustments will not be correct.
Order of adjustment:
1. Check and adjust the plate vial.
2. Check and adjust the circular vial.
3. Check and adjust the optical plummet.
Always recheck your adjustments. We recommend that
any adjustments, other than those shown, be done by a
qualified Instrument repair technician.
5.2 Checking And Adjusting
1. The plate vial
A) Place the plate vial parallel with the level
screws, A and B. Center the bubble using these
two level screws.
B) Turn the instrument 90° and center
the bubble using level screw C.
C) Return to the original position in step A. Recheck the bubble and center as necessary. Rotate the instrument 180° (200g). The bubble should still be centered in the vial.
If not, go to step D.
D) Using the adjusting pin provided in
the case, turn the screw until the
bubble moves halfway back to its
original position.
E) Return the instrument to its original
position follows steps A through C.
Repeat these steps until the bubble
stays centered in all positions.
2. The Circular Vial
Part 1, adjusting the plate vial, should have been done
prior to this step.
If the circular vial is centered after leveling the plate vial,
then no further adjustment is necessary. If not, proceed
with the following adjustment.
Using the adjusting pin provided in the case, turn the
adjusting screws until the bubble is centered in the vial.
DO NOT OVERTIGHTEN THE ADJUSTING SCREWS.
Loosen one screw 1/4 turn, then tighten one
screw 1/4 turn.
14
3. Optical Plummet
This adjustment is required to make the line
of sight of the optical plummet coincide with
the vertical axis.
A) Point the optical plummet at a ground target. This can be done by adjusting the
level screws or by loosening the instrument fastening screw and moving the instrument over the target.
B) Turn the instrument 180° (200g) around and re-sight
the target through the optical plummet. If the target is
still centered, no adjustment is necessary. If not, go to
step C.
C) Remove the adjusting screw cover from the
optical plummet. Unscrew in a counterclockwise
direction. This will expose four reticle adjusting screws.
D) Using the adjusting pin provided in the case,
turn the reticle adjusting screws until half the
displacement has been removed. Loosen
one screw 1/4 turn, then tighten the
opposing screw 1/4 turn.
E) Repeat steps A through D until there
is no displacement of the target when
the instrument is turned about its vertical
axis
5.3 Setting The Vertical Zero Postion
PROCEDURE
KEY
Accurately level the instrument
N/A
Press and hold the V% key while pressing
the power key. The instrument display will
enter the vertical zero adjustment mode.
V%
Turn the telescope past the zero point.
The display will show "STEP 1".
Sight the telescope at a target that is level
with the instrument within 10 seconds.
Press "V%". This will store the data for the
first point. The display will show "SHOW --2".
Reverse the telescope and re-sight the
original target. Press the "V%" key. This will
store the data for the second point and
establish a vertical zero point at level. Once a
key is pressed, the instrument will beep and
return to regular measurement mode.
DISPLAY
L
V
O SE
V
9 5 L1 0 2 0
SE - - 1
HR
V%
V
HR
9 5 L1 0 2 0
SE - - 2
V%
V 26 1 1243
HR 1 8 0 0 0 0 0
15
6. TRIBRACH
Removal:
Turn the locking lever 180° counterclockwise.
The instrument can now be removed from
the tribrach.
Attachment:
Line up the tongue on the instrument
with the notch in the tribrach. Turn the
locking lever 180° clockwise.
7. ACCESSORIES
Standard Equipment: Carrying case, Sunshade, Tool kit, Rain cover, Drying cloth,
Plumb bob
Optional equipment: Rechargeable battery, Charger, Tripod, Diagonal eyepiece, Level
rod, Solar filter, Triangle tribrach, Solar reticle
8. HANDLING PRECAUTIONS
• Use care to avoid shock to the instrument. Always provide some cushioning to
minimize risk of shock during transportation. The instrument cannot be expected to
function properly if exposed to heavy shock.
• Check the battery indicator. Be sure to check the voltage level before using
the instrument.
• Carrying the instrument. Always remove the instrument from the tripod when
carrying at the job site. If the instrument must be carried on the tripod, hold the
instrument as vertically as possible and keep it in front of you. Never carry the
instrument horizontally over your shoulder. Any long distance transport should be
done with the instrument in the carrying case.
• Do not expose the instrument to direct sunlight for long periods. Never
leave the instrument exposed to extreme heat longer than necessary. It could affect
the instrument's performance.
• Store the instrument properly. The instrument should be stored in an area of
low humidity and where the temperature will not exceed 110° F (45° C). Always
remove the batteries before storing the instrument.
• Cleaning the instrument. Any dust on the lenses should be removed first with a
small brush, then use a lens tissue or soft clean cloth (use a light touch to avoid
scratching the lenses).
Dry the instrument after use in the rain. Do not use harsh chemicals to clean the
instrument or carrying case. A mild detergent or water dampened rag is all that is
necessary.
16
9. SPECIFICATIONS
Overall Length
155mm (6.1")
Objective aperture
45mm (1.77")
Magnification
TELESCOPE
Erect
Field of view
1° 30'
Resolving power
Minimum focus
Stadia Ratio
Stadia constant
ELECTRONIC
ANGLE
MEASUREMENT
30X
Image
Method
Minimum reading
Accuracy**
Diameter of circle
2.5"
1.3M (53")
100 to 1
0
Incremental
5"/10" (3/5 mog)
10" (6mog)
82mm (3.22")
Display & Reticle
ILLUMINATION
Magnification
OPTICAL PLUMMET Field of view
Focusing range
3X
5°
0.5 M to infinity
(20" to infinity)
LEVEL VIAL
Plate vial
SENSITIVITY
Circular vial
Operating voltage
required
DISPLAY
Operating time
OPERATING RANGE (Alkaline batteries)
Operating
Temperature range
SIZE
WEIGHT
30" per 2mm
8' per 2mm
4-6 VDC
(4) AA Batteries
15 hrs continuous use
@ 20°C (68°F)
-20° to +50°C
(-4° to +122°F)
145x200x300mm
4.4 Kg inst only
6.8 Kg w/case
** Standard deviation based on DIN18723.
17
®
P.O Box 359, Watseka, IL 60970 USA
(800) 435-1859 • (815) 432-5237
FAX (815) 432-5390
www.davidwhite.com
P/N DWT10MANL 08/02
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