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CST/BERGER
DGT10 ELECTRONIC THEODOLITE
REPAIR MANUAL
DGT10 PAGE 1 REV.A
CONTENTS
1 NOMENCLATURE AND FUNCTIONS
1.1 NOMENCLATURE... EEE e nccoconreo nene RES 3
1.2 DISPLAY SYMBOLS AND KEY FUNCTIONS..…....rceseserssrsa cee 4
1.3 SETTING MEASURING PREFERENCES... coo, 5
2 CONFIGURATION AND OPERATING PRINCIPLES i
2.1 CONFIGURATION... errrsrerens are res se nan se nee sance eee re Fie res sn ee 6
22 OPERATING PRINCIPLES... sense nca crea cs ane Tennivecenareneac rece rare eee 6
2.3 BLOCK DIAGRAM.............eedevicicoriereriecerienerresereccereeve crecer re rerrn ec rcererr e eer re eee. 7
3 ELECTRONIC FUNCTIONS
3.1 TESTING THE DISPLAY oii eee eases 8
32 WIRE ROUTING DIAGRAM... eee eee 11
3.3 MAIN CIRCUIT BOARD DIAGRAM. Loc ere 12
34 SECONDARY CIRCUIT BOARD DIAGRAM... reee 13
3.5 SIGNALS AND VALUES... eee ene 13
3.5.1 CIRCUIT BOARD TEST POINTS... etter ear eee 13
3.5.2 SOCKET DESIGNATIONS... errs 13
3.5.3 DIAGRAM OF PCB2 OUTPUT SIGNAL .....coo EEK R ER ER KEN ER ER EEEEETG 14
3.5.4 SIGNAL REFERENCE VOLTAGES...............eeevenereerercrerrerrerieecnenercerere een enenene 14
3.5.5 VERTICAL OVER-ZERO SIGNAL DIAGRAM. .....ocoii K RER KK KK KR EEE EEE 14
3.6 INSPECTION AND REPAIR OF ELECTRONICS... coin ne sea a rene nca cas 15
3.6.1 ERROR CODES..................eemeneveeriercerecerererecereererereternecererercere nene nene.. re EEG 15
3.6.2 VERTICAL ZERO SET............rscrersense seras sse sea na rare se nee nee ne sers era rares nee eee eee 15
37 TROUBLE SHOOTING THE ELECTRONICS......rseererstassen ares rares rene en secs ses ere e casa ce 16
3.8 CLEANLINESS OF ENCODERS...…..….....ecsesesisssensensa eee 20
39 TESTING TOOLS 8% ENVIRONMENT................e.erereecerencererecreecene enereroorenerervenerecarereecen 20
310 ADJUSTMENT OF SIGNALS..…........sersscersensene rca sea nre nee sa rene a sac e nada na sen e seen senc Sec t ES 20
23.,10.1 ADJUSTMENT OF CENTRAL VOLTAGE...…rssiessrsernensen are sera ses ea cases rene cac see 20
3.10.2 ADJUSTMENT OF SIGNAL AMPLITUDE.....…...….….…..………es ES 21
3.10.3 ADJUSTMENT OF OVER-ZERO VOLTAGE.....cciciiiiiiii ee. 21
3.11 INSTALLATION AND ADJUSTMENT OF THE HORIZONTAL DETECTOR................—.... 22
4 STANDARDS AND SPECIFICATIONS
4.1 INSPECTION STANDARD SS. otras 23
4.2 SPECIFICATIONS.................eererereecerreroeeereccenerecaneecece recreo eeracerererenercenerencenerenerareere.. 24
5 MECHANICAL ADJUSTMENTS
5.1 PLATE VIA tite ee eee ee eee eee eae eee esas 25
5.2 CIRCULAR VIAL. titties eee reeset reteset teases eae 25
53 VERTICAL CROSSHAIR PLUMB... er er rr eee 25
54 — TELESCOPE AXIS PLUMB..............sercsssacses sea na area re nana nana eerste 26
5.5 LINE OF SIGHT CENTERING OVER VERTICAL AXIS... rene eee 26
56 CENTERING OPTICAL AXIS OVER VERTICAL AXIS.....coiiiiiiie EEK RER EE EEE 27
5.7 HORIZONTAL CIRCLE CONCENTRICITY oer 27
58 VERTICAL CIRCLE CONCENTRICITY oie 27
5.9 OPTICAL PLUMMET LINE OF SIGHT..........….scrrrssreseeseu se rene san e sara sera réa san e sance nca 28
5.10 OPTICAL PEEPSIGHT LINE OF SIGHT..........crrccsersreesre stars en seen case na cernes ane e een rase 28
6 MECHANICAL DISASSEMBLY AND REPAIR
6.1 HORIZONTAL AND VERTICAL TANGENT/CLAMP SCREW... 29
62 TELESCOPE... citi tiie tee esses 30
6.3 VERTICAL AXIS. oii eerie estes see 30
6.4 HORIZONTAL AXES. iii eee eee erect eae 32
DGT10 PAGE 2 REV.A
1 NOMENCLATURE AND FUNCTIONS
«1 NOMENCLATURE
CARRYING HANDLE BATTERY CASE
HANDLE SCREW FOCUSING KNOB
LL
|,” ÉVEPIECE
VERTICAL
CLAMP KNOB
PLATE VIAL
VERTICAL
TANGENT
TRIBRACH
CLAMP KNOB
TARGETING SIGHT
INSTRUMENT
OBJECTIVE LENS CENTER MARK
HORIZONTAL
CLAMP KNOB
HORIZONTAL
CLAMP SCREW
©
_ OPTICAL
DISPLAY WINDOW PLUMMET
DISPLAY WINDOW
DISPLAY WINDOW pe BASE
DGT10 PAGE 3 REV.A
1.2 DISPLAY
SYMBOLS
KEY FUNCTIONS
©
Ж re om (RL) es
ANHt-(86686888 - Ta
à 8 AVG pf , и
| Нк. - (66.6.6666, Ват
= Е
© ©)
DISPLAY MEANING
V Vertical angle display
HR Clockwise horizontal angle display
HL Counter-clockwise horizontal angle display
% Percent of grade (slope) display
G Angles displayed in gons
BAT Battery power remaining display
KEY FUNCTION
RIL To switch between clockwise and counter-clockwise
horizontal angle reading
\/®% То switch vertical readings between degrees (gons)
) and percent of grade (slope)
HOLD To lock and unlock the horizontal angle reading
OSET To zero the horizontal angle reading
To switch the illumination of the display and reticle
on/off
To switch the LCD display on/off
DGT10 PAGE 4 REV.A
1.3 SETTING MEASURING PREFERENCES
Turn on the power
© 5 @
To get into the measurement preferences
mode, press the "r/!" and "v%" keys at the 10 360
same time. A tone will be heard and the
display will look similar to that shown at = 8 uc ея?
right. = (2)
(© ©)
PRESS TO DISPLAY
| Change the readout of the horizontal and vertical x 360
angle display to show 5 second or 10 second
readout. (The accuracy of the instrument is 10 0 UC GA
seconds. Changing the display does not make ——
the instrument more accurate.)
AL
(0 360 K
Change between 360° angular readout
and 400 gons angular readout. BAT
|
- No auto power off
"30" - 30 minute
"10" - 20 minute auto power off
Change the time until automatic shutoff
of the display. The three modes are:
page.
Change the zero points and angle
readout pattern of the vertical circle. The
three modes shown are "Ua", "Ub" and
"Uc". See the diagrams on the next
10 360
DGT10 PAGE 5 REV.A
0° 90°
E
270% + H--90° 180°
180° 270°
he
lar
Ua MODE, ZENITH ANGLE Ub MODE, VERTICAL ANGLE
0° 0°
90°
UC MODE, HEIGHT ANGLE
Press "R/L" and "V%" at the same time to return to normal operating mode.
2 Configuration and operating principle
2.1 Configuration
Angular measurement on the DGT10 is
accomplished using optical encoders. The
optical encoders are made up of a stationary
glass disk and a rotating glass disk. The
stationary disk has a mash which covers most
~f the surface except for 4 small windows which
et light pass through. The rotating disk is
marked with light and dark lines placed radially
all around the disk.
Above this pair of disks is a set of photoelectric
sensors. Below the disks is an led and a set of
optics the collimate the light.
2.2 Operating principles
The led shines a light up onto the set of disks.
As the rotating disk turns, the light and dark
lines on the circle let through more or less light
from the led. The photoelectric sensors pick up
the light that is allowed to pass through the disks
and turn it into an electrical current. This signal is
in the form of two sine waves. The length of
each sine wave equals 80 arc seconds of
rotation. These sine waves, whose phase
PHOTOELECTRIC
RECEIVER
< «< Æ STATIONARY DISK
ROTATING DISK
- J > o |
e COLLIMATING
— - OPTICS
NL.ED.
difference is 90%, Are sent to the circuit board for amplification, rectification, counting
and division. The new signal now produces the angular reading seen on the display.
DGT10 PAGE 6 REV.A
ete ——— 60 АВС — — — >
SECONDS
bray,
2.3 BLOCK DIAGRAM
BATTERY
PRIMARY CIRCUIT
BOARD
|
| POWER
SWICH
| CONTROLLER
|
SECONDARY CIRCUIT
BOARD |
pe WE Geel BANA SSCS | WTA GRAMS SOS | DD Cos
| |
ENCODER + AMPLIFIER — RECTIFIER > es, EROM
|
|
|
|
—
CENTRAL
PROCESSOR
HORIZONTAL AMPLIFIER LL. Г. — — — —
ENCODER | | | SPEAKER
Lol Него к
|
ee ce ООО ООО amet ee — ——— — — — — ИНН
A A
ILLUMINATION DISPLAY KEY |
| _
DGT10 PAGE 7 REV.A
3
ELECTRONIC FUNCTIONS
3.1 TESTING THE DISPLAY
NO PROCEDURE KEY DISPLAY POSSIBLE | INSPECTION
ERROR POINT
1 Level the instrument
7 )
Ж REP € "ew
A|VH: - 10808898 “Ta
Turn on the power 50 8 AVG TILT eS
2 (All segment of the display À Ha -18884688, "sn:
should light for 1 second)
V SET
по
3 Initial display Hr 0 Vo 00 "вх
" IF THE
у 0 bo to VERTICAL CHECK POINTS
4 Turn the telescope to set the He 0 Vo 60 "ss; | | ANGLE DOES J3-3 ON THE
vertical angle NOT SET, SECONDARY
CHECK THE CIRCUIT BOARD
OVER-ZERO V.20.8V
VOLTAGE.
IF THE DISPLAY
SKIPS DIGITS
AS IT'S CHECK POINTS
TURNED, 1 AND 2 ON
Change the horizontal reading RIL CHECK THE THE
| f “py «y ut CENTRAL SECONDARY
5 rom "Ha: to Hi”. Turn the VOLTAGE AND CIRCUIT
instrument horizontally and THE BOARD.
watch angular value. AMPLITUDE Ve=2.5V
SENT FROM +0.04V
THE
HORIZONTAL
DETECTOR.
IF THE DISPLAY
SKIPS DIGITS
AS IT'S CHECK POINTS
TURNED, 1 AND 2 ON
(RL) CHECK THE SECONDARY
: CENTRAL
6 Switoh the horizontal reading to VOLTAGE AND CIRCUIT
He" and repeat step 5. THE BOARD.
AMPLITUDE Ve=2.5V
SENT FROM +0.04V
THE
HORIZONTAL
DETECTOR.
DGT10 PAGE 8 REV.A
i POSSIBLE INSPEC
TION
NO PROCEDURE KEY DISPLAY ERROR POINT
OSET er
— V 0 b000 Horizontal
Aim at a vertical target >200 . , | al angle
7 (50m) and zero set the Hr 00060 Tex | | Will not reset to Replace
\ | zero. display
horizontal angle display. ; Keyboard error.
Horizontal angle
Turn the instrument 360° 0 vo do * does nol rem 1. Replace
Horizontally and re-aim at V Error in m ain main circuit
8 target again. The horizontal H. 0 00 60 "sa circuit board or board
angle should be zero again. horizontal 2. Center
centered to the
vertical axis.
While aiming at the target, V o 000” ne amore
zero the horizontal angle H 180 Y0 00 "ss greater the 10 Center the
9 reading. Turn the instrument и BAT seconds. The horizontal
180° and flop the telescope horizont al circle encoder
to re-aim at the target. is not centered.
If the display Check points
skips digits as its | 3 and 4 on
Lock the telescope in place un = 9 onecic se ne ary
10 and tit he telescope win the voltage and the | circuit board.
9 ; amplitude sent Ve=2.5V
from the vertical +0.04V
detector. .
Aim the telescope at a V 99 ‘п 1
11 horizontal target >200 ft. Hi 180 0000 "exi
(50m) away. Record the
vertical angle reading.
If the two vertical
v e6 105” readings do not
wo add up to 360° 1. Adjust the
а ho tel , Ho 1800000 "a || within <30', the reticle.
12 everse Pr ny Conor an reticle needs to | 2. Center the
re-sig e target. be adjusted or vertical
the vertical encoder.
encoder is not
centered.
DGT10 PAGE 9 REV.A
INSPECTION
| NO PROCEDURE KEY DISPLAY РОВ PECT!
If the angle does
Press the horizontal lock key. Vv 261 12 " not flash or does
HOLD
The horizontal angle should - и not hold when
13 blink. Turn the instrument He 180 9000 "xt | | the instrumentis | “eplace the
horizontally. The horizontal turned, the display
angle should not change. keyboard is
3 defective.
Press the horizontal lock key bl led
14 again. The horizontal angle Ho 180 0000 "as:
reading should return to
normal.
Turn the telescope and keep
the vertical angle betweenú yr М 126 % angle docs not
15 y The ea sono Hi 1/80 D000 "as change to Replace the
reading should appear with ee воре», display
the % sign. Above level, the detective
slope should be positive.
V- Hil %
116 Below level, the slope should Hi. (80 9000 "es:
be negative.
Any vertical angle greater у ea %
than +45* should be out of ho do "ss
17 the % slope range and be Ho (680 D000 GA
shown as
Press the illumination key. | (XP)
18 The displays and the
telescope reticie should be
illuminated
19 Press the illumination key
again to switch off.
20 Press the power key to shut
off the instrument
DGT10 PAGE 10 REV.A
bar, ,
3.2 WIRE ROUTING DIAGRAM
VERTICAL
SENSOR
HORIZONTAL
gl,
ON SECONDARY
CIRCUIT BOARD
PRIMARY CIRCUIT POWER
BOARD (PCB1) SUPPLY
DGT10 PAGE 11 REV.A
3.3 MAIN CIRCUIT BOARD (PCB1)
Ее
Ja
D2
"Di
D7
ze]
3
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Rid
ai
D3
(=)
[hs |
3 [R17] [R16]
Гы
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VC
oz [4]
T
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Ro
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ces
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8 5
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—
a
C16 |
DGT10 PAGE 12 REV.A
3.4 SECONDARY CIRCUIT BOARD (PCB?)
7
wl 2] 50 |
J7
O LL] у
=
3.5 SIGNALS AND VALUES
3.5.1 CIRCUIT BOARD TEST POINTS
TEST POINTS:
POINT 1- CP1 HORIZONTAL
POINT 2- CP2 HORIZONTAL
POINT 3- CP1 VERTICAL
POINT 4- CP2 VERTICAL
J3-3
3.5.2 SOCKET DESIGNATIONS
SOCKETS:
J7
J8
JS
JO
J2,
J2
JS
J4
J3
- VERTICAL ZERO
VERTICAL DETECTOR
HORIZONTAL DETECTOR
DISPLAY
DISPLAY
TO PCB 1
DISPLAY
DISPLAY
POWER SOURCE (5+ 0.05V)
DGT10 PAGE 13 REV.A
3.5.3 DIAGRAM OF PCB2 OUTPUT SIGNAL
-— 28 — —»
CP1
li а a
CP2
|
AMPLITUDE
| OF s
CENTRAL
VOLTAGE
OV |
3.5.4 SIGNAL REFERENCE VALUES:
SIGNAL AMPLITUDE: СР1 11000mv +10%
CP2 1000mv +10%
PHASE DIFFERENCE BETWEEN CP1 AND CP2 SIGNALS: 90°x5% (a°+5%)
CENTRAL VOLTAGE: 2.5 +0.04V
Vs > 0.8V
Vn-Vs > 0.4V
3.5.5 DIAGRAM OF VERTICAL OVER-ZERO SIGNAL
DGT10 PAGE 14 REV.A
3.6 INSPECTION AND REPAIR OF ELECTRONICS
3.6.1 DISPLAYED ERROR CODES
PRESS TO
DISPLAY CAUSE CLEAR
ERROR
£01 Instrument spun around horizontally at too grat a speed for the
horizontal detector. ”
£02 Telescope spun around vertically at too great a speed for the vertical
detector.
£03 Error in the horizontal angle measurement system. Re-start the 2X
instrument
E04 Error in the vertical angle measurement system. Re-start the 2X
instrument |
EOS Read/write error of the inner memory of the instrument. N/A
E06 Error in the rectification of the vertical angle zero position signal. N/A
3.6.2 SETTING THE VERTICAL ZERO POSITION
PROCEDURE KEY DISPLAY
Accurately level the instrument N/A
Press and hold the V% key while pressing the | у SET
power key . |
You should enter the vertical zero adjustment BAT
mode.
, . у SP
Turn the telescope past the zero point. The display
will show "STEP 1", BAT
Sight the telescope at the front collimator level line. V% V Sie
Press "V%". This will store the data for the first ss
point. The display will show "STEP 2".
Reverse the telescope and re-sight the front
collimator level line. Press the "V%" key. This will V 25104"
store the data for the second point and establish a у
vertical zero point at level. Н. (eo dodo “ex
Once the key is pressed, the instrument will beep
and return to regular measurement mode.
DGT10 PAGE 15 REV.A
3.7 TROUBLESHOOTING THE ELECTRONICS
THE DISPLAY WILL NOT
LIGHT WHEN THE POWER
KEY IS PRESSED.
NO
Eras
IS THE VOLTAGE GREATER
THAN 5.5V (LOAD CURRENT
5.6mA)?
INSPECT THE
CONNECTIONS AT THE
POWER SUPPLY.
REMOVE THE PCB COVER PLATE
O TEST THE VOLTAGE AT J3 ON
PCB1. (SEE SECTION 3.3, LOWER,
RIGHT CORNER)
2
NO
IS THE VOLTAGE GREATER
THAN 5.5V?
INSPECT THE
CONNECTIONS AT PCB1.
REPLACE PCB1.
THE DISPLAY
CHARACTERS ARE
INCOMPLETE.
NO
1S ONLY ONE CHARACTER
LOST?
REPLACE THE
DISPLAY.
NO
IS THE DISPLAY NORMAL?
y
INSPECT THE CABLES
AND CONNECTIONS . IF
OK, REPLACE PCB1.
DGT10 PAGE 16 REV.A
THE VERTICAL ZERO
POINT WILL NOT SET.
TEST THE VOLTAGE AND
WAVEFORM OF POINT "ve"
ON PCB1 (SEE SECTION
3.10.2)
NO
ARE THE VOLTAGE AND
WAVEFORM NORMAL? y
INSPECT THE CONNECTIONS OF
THE VERTICAL. DETECTOR TO
PBC2 AND THE CONNECTIONS OF
PCB2 TO PCB1. ADJUST THE
POSITION OF THE VERTICAL
DETECTOR IF NECESSARY. (SEE
SECTION 3.11)
RE-ADJUST THE
VOLTAGE OF "Vz" ON
PCB1. (SEE SECTION
3.10.3)
IS THE VERTICAL ZERO NO
SET NORMAL? |
REPLACE PCB1.
THE KEYS ON THE
DISPLAY DO NOT WORK.
REPLACE THE
DISPLAY.
NO
IS THE DISPLAY NORMAL?
INSPECT THE CABLES
AND CONNECTIONS . IF
OK, REPLACE PCB1.
DGT10 PAGE 17 REV.A
EO1 =OVER-SPEED OF HORIZONTAL DETECTOR
E02 =OVER-SPEED ERROR OF VERTICAL DETECTOR
[ E01 OR E02 oar. |
WAS THE INSTRUMENT OR
TELESCOPE ROTATED TOO
NO
PRESS "OSET" KEY TO
CLEAR EO1 ERROR.
PRESS "V%' KEY TO
CLEAR EO2 ERROR.
NO
IS THE ERROR CLEARED
FROM THE DISPLAY?
Y
REPLACE PCB1.
E03, EO4 =ERROR IN VERTICAL OR HORIZONTAL ANGLE MEASURING SYSTEM.
[ E03 OR E04 оо
TURN THE POWER OFF,
THEN TUEN IT BACK
NO
19 THE ERROR CLEARED
FROM THE DISPLAY?
REPLACE PCB1,
DGT10 PAGE 18 REV.A
E05 = MEMORY ERROR
С EQS DISPLAYED. )
TURN THE POWER OFF,
THEN TN IT BACK
NO
IS THE ERROR CLEARED
FROM THE DISPLAY?
'
REPLACE PCB1.
E06 =ERROR IN RECTIFICATION OF VERTICAL ANGLE ZERO SIGNAL.
[ EOS DISPLAYED. )
TURN THE POWER OFF,
THEN TN IT BACK
NO
iS THE ERROR CLEARED
FROM THE DISPLAY?
'
REPLACE PCB1.
DGT10 PAGE 19 REV.A
3.8 CLEANLINESS OF THE ENCODERS
When the displayed angular values start to skip digits, or accuracy suffers, or
measurements functions are not working correctly, it's time for a thorough inspection
and adjustment of the angular measuring system.
Before any work concerning the electronics is started, the horizontal and vertical
encoders should be checked.
1. Check the cleanliness of the encoder disks. If dirty, clean with
Alcohol or acetone.
2. Check the gap between the stationary and rotating disks of the
Encoder. The gap should be between .0008" and .0012" (.02/.03mm).
3.9 TESTING TOOLS & ENVIRONMENT
Tools Environment
1. Dual trace oscilloscope. (20mhz) 1. Temperature of work area 68-77 °F
2. Digital multimeter (20-250).
3. 0-9v voltage supply 2. Keep direct sunlight from the work
area.
3. Keep work area clean.
4. Use grouding devices (mats and wrist
straps) to protect delicate circuit boards.
3.10 ADJUSTMENT OF THE SIGNALS
3.10.1 ADJUSTMENT OF THE CENTRAL VOLTAGE, Vc
Ve of the wave form should be 2.5v +0.04v (See section 3.5.3). If the Central or Mean
Voltage is incorrect, the detector indicated below will need to be adjusted until
corrected.
Test point Detector to be adjusted
1or2 Horizontal!
3 or 4 Vertical
There are two potentiometers on each detector. One corresponds to test point 1 and the
other to test point 2 (on the horizontal detector). (Test points 3 and 4 on the vertical
detector.)(see section 3.10.1)
O O o
© O ’ | ® | X
VERTICAL. HORIZONTAL
POTENTIOMETERS POTENTIOMETERS
DGT10 PAGE 20 REV.A
While holding the shaft of the screwdriver, touch the potentiometer with the tip of the
screwdriver. If the waveform changes, you have found the correct potentiometer. While
slowly turning the axis of the instrument that you are working on, turn the adjusting
screw of the potentiometer until the Vc is 2.5V =0.04V.
3.10.2 ADJUSTMENT OF SIGNAL AMPLITUDE
Using a voltage supply of +5v +0.01v, connect to socket J4 on PCB2. Watch polarity.
Using an oscilloscope, test: Point 1, Point 2, Point 3 and Point 4.
On PCB2 while turning the telescope or instrument slowly, watch each wave form. They
should be in the shape of a sine wave.
The amplitude should be 0.8-1.2v. If the amplitude
is not correct, adjust the potentiometers Related to К J
the test points as shown on the table. . Ш
TEST POINT | POTENTIOMETER ROTATE
1 WR1 HORIZONTALLY
2 WR2 HORIZONTALLY —
3 WR3 VERTICALLY =
4 WR4 VERTICALLY
3.10.3 ADJUSTING OVER-ZERO VOLTAGE
Bring in the telescope so it is level and
lock the vertical lock screw. Using an
oscilloscope, test point Vc on PCB1 (See
section 3.3). Using the tangent screw, tilt
the telescope up and down slightly until
you find the minimum voltage, Vs. Re- |
measure Vs with the multimeter. vn
Vs
Next, measure the value of Vn using the y |
oscilloscope. Vn is the first dip in voltage
to either side of Vs as shown in the
figure at right. The over zero voltage, Vz, of PCB1 is determined using the following
formula:
Vz=0.2 * (Vn-Vs) + Vs
Adjust WR1 to make the value of Vz equal to the formula shown above within 0.01 V.
DGT10 PAGE 21 REV.A
3
ul
11 INSTALLATION AND ADJUSTMENT OF HORIZONTAL DETECTOR
(Adjustment of the vertical detector is done the same)
Center the encoder disc (rotating disc) as required to 1/3 of a division total error.
This should be done with a set of 100x magnification microscopes.
Adjust the distance between the stationary and rotating discs to 0.02/0.03mm
(.0008".0012%. A
Mount the horizontal detector and connect it to the power supply and testing
devices as shown below.
Horizontal Detector Plug
PIN NO. DEVICE
CP1 output
not used
+5.0vdc/ 390 ohm resistor
ground
390 ohm resistor
CP2 output
OO A D ND À
Turn the encoder. Two sine waves will be
generated on the oscilloscope. Adjust the Regulated
position of the detector until its sine wave pie
has an amplitude of 500-600mv with no ma
distortion of the wave.
Change the reading on the oscilloscope TA Sv0.1vde
to XY input mode. With CP1 connected 4
to X input and CP2 connected to Y input, + 6 4 e
fine adjust the position of the encoder
disc so there is a phase difference of less
than 10° on the Lissajou's figure 3900hm
displayed.
b,
X:1v/grid Y:1v/grid
DN AD ore
+ Y +
7 В N Incorrect
UY
DGT10 PAGE 22 REV.A
4 INSTRUMENT STANDARDS AND SPECIFICATIONS
4.1
INSPECTION STANDARDS
nspect each item in the order shown
alignment
MAXIMUM | ADJUSTMENT
ITEM PROCEDURE J ERROR SHOWN ON
ALLOWED PAGE
Level the instrument so that the air bubble is 4 /6 of a
Plate vial centered in the plate vial. Turn the instrument 180° division
and check the new position of the air bubble.
(Check after leveling the instrument to the plate 1/4 of a
Circular vial vial.) division
Sight into the collimator or a plumb line. Align the Thickness
Vertical crosshair | vertical hair of the instrument with the vertical hair of the
plumb of the collimator of plumb line. Check alignment at crosshair
the very top and bottom of the field of view.
Alight the vertical hair of the instrument with the
upper collimator reticle. Sight at the lower
collimator and record the reading seen on the я
Telescope plumb collimator reticle. Repeat with the instrument's 10
telescope in the inverted position. The difference
between the two readings is the plumb error x2.
Sight into the front collimator and align the vertical
Line of sight hair of the instrument. Flop the telescope to sight
centered to into the back collimator. Record the reading seen 5
vertical axis in the collimator. Turn the transit horizontally and
repeat the process. The error is 1/4 the difference
between the two readings.
optical axis Using the short distance sights of the collimators 20"
Vertical axis (approx 10/3m), repeat the test shown above.
Sight a vertical hair in the front collimator and zero
, . the horizontal angular reading. Reverse the
oncontrici telescope and re-sight the original target. The <20"
error is the difference between the final reading
and 180% 00' 00".
Vertical circle "
concentricity <20
Optical plummet u
line of sight 1/32" (Imm)
Optical peepsight 30
DGT10 PAGE 23 REV.A
4.2 SPECIFICATIONS
OPTICAL PLUMMET
LENGTH 155mm (6.1
OBJECTIVE APERTURE 45mm (1.77
MAGNIFICATION 30X
IMAGE ERECT
TELESCOPE FIELD OF VIEW 1°30
RESOLVING POWER 2.5"
MINIMUM FOCUS 1.3M (53)
STADIA RATIO 100 TO 1
STADIA CONSTANT 0
METHOD — GLASS ENCODER
ELECTRONIC LCD DOUBLE DISPLAY
ANGLE MINIMUM READING 5'/10" (1.5/3mog)
MEASUREMENT ACCURACY** 10" (3mog)
CIRCLE DIAMETER 82mm (3.22"
ILLUMINATION LCD AND RETICLE YES
MAGNIFICATION 3X
FIELD OF VIEW 5°
FOCUSING RANGE
0.5M(20"- INFINITY
60" PER 2mm DIVISION
CASE
LEVEL VIAL PLATE VIAL
SENSITIVITY CIRCULAR VIAL 8' PER 2mm
OPERATING VOLTAGE 4-6 VDC
BATTERIES (4) "AA" SIZE
DISPLAY OPERATING OPERATING TIME W/ 15 HRS CONTINUOUS
RANGE ALKALINE BATTERIES USE @ 20°C (68°F)
OPERATING -20°C TO +50°C
TEMPERATURE RANGE (-4°F TO +122°F)
SIZE 144 X 175 X 324 mm 5.7 X 6.9 X 12.8 INCHES
WEIGHT INSTRUMENT 4.4KG. INSTRUMENT 94 LBS
** STANDARD DEVIATION BASED ON DIN18723
DGT10 PAGE 24 REV.A
5 MECHANICAL ADJUSTMENTS
5.1 PLATE VIAL
|. Turn the instrument until the plate vial is in position "1" or
"2" as shown at right. Use the level screws marked "A" and
"B" to center the air bubble in the vial. 1-9
2. Turn the instrument 180°. If the bubble is not centered,
remove half the error with the vial adjusting screw. 3
|
Remove the other 1/2 of the error with level screws "A" and C12]
"3"
3.turn the instrument until the vial is a position "3"
and level the instrument using only level screw "C". ADJUSTING SCREW
4. Repeat steps 1,2 and 3 until the error is less the
1/6 of a division on the vial. |
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5.2 CIRCULAR VIAL
With the instrument leveled to the plate vial,
center the circular vial air bubble to within 1/4 of
a division using the adjusting screws.
5.3 VERTICAL CROSSHAIR PLUMB TO VERTICAL LINE OF SIGHT
Sight into the collimator and adjust the vertical hair of the
telescope to the vertical reference line in the collimator. Remove
the cover over the adjusting screws on the eye end of the
telescope. Then loosen the reticle adjusting screws very slightly
and tap the heads of the adjusting screws until the hair is plumb.
Re-tighten the adjusting screws and check the plumb again.
\ ADJUSTING SCREWS
DGT10 PAGE 25 REV.A
5.4 TELESCOPE AXIS PLUMB
Sight into the lower collimator and align the vertical telescope hair with the vertical
eference line in the collimator. Tilt the telescope up to sight into the upper collimator.
Record the reading from the scale. Invert the telescope and transverse the instrument
the re-sight the bottom collimator. Again, line up the telescope with the collimator, sight
the upper collimator and record the reading. The difference between the first and
second reading equals twice the error of the telescope plumb.
To adjust
1. Remove the battery pack and the rubber plug from the side
of the telescope. This will expose the axis bearing screws.
LOOSEN THESE 3 SCREWS
2. Loosen the three screws shown. Remove the /
adjusting screw covers. X SN
3. The adjusting screws work against each other to TE - ——7 |
. ‘ o ANNO UIT OT 1s
raise or lower the telescope axis. Loosen one rn
screw, then tighten the other until the error is less | AN
the 10".
LEAVE THIS SCREW TIGHT,
IT IS THE PIVOT POINT.
COVER ADJUSTING SCREWS
Y
5.5 LINE OF SIGHT CENTERED OVER VERTICAL AXIS
1. Line up the long focus vertical
crrosshair of the front collimator
(180m/ 600” with the vertical
crosshair of the telescope.
2. Invert the telescope to sight on
the back collimator and record the
reading. BACK COLLIMATOR TRANSIT FRONT COLLIMATOR
3. Turn the instrument 180” to re-
DGT10 PAGE 26 REV.A
sight the front collimator. Align the vertical crosshair of the telescope to the collimator.
4. Invert the telescope and record the reading found on the back
,ollimator. The error is 1/4 of the difference between the two
ecorder readings.
5. Adjust the left and right side reticle adjusting screws until the
two readings agree with 5 arc seconds or less.
ADJUSTING SCREWS
5.6 CENTER OPTICAL AXIS OVER VERTICAL AXIS
This test is the same as the previous test except you are sighting on the short distance
reticle targets in the collimators (3m/ 109).
If the error exceeds 120", return to Berger for adjustment or replacement.
5.7 HORIZONTAL CIRCLE CONCENTRICITY TO VERTICAL AXIS
1. Sight at the vertical hair of the long focus target in the collimator (180m/ 600). Align
the telescope vertical hair with the target.
2. Zero the horizontal angle reading.
3. Turn the instrument 180° and flop the telescope to re-sight the original target. The
error is the difference between 180° and the actual horizontal angle reading.
If the error is more than 20 arc seconds, return to Berger for adjustment.
5.8 VERTICAL CIRCLE CONCENTRICITY TO HORIZONTAL AXIS
1. Sight at the horizontal hair of the long focus target in the collimator (180m/ 600).
Align the telescope horizontal hair with the target.
2. If the vertical angle reading of the display is not set at 0° when aligned with the
horizontal hair of the collimator long focus target, set the vertical line of sight using the
DGT10 PAGE 27 REV.A
steps shown on page 16.
3. After initial alignment is complete, turn the instrument 180° and flop the telescope to
e-sight the original target. The error is the difference between 360° and the sum of the
irst and second actual vertical angle reading.
If the error is more than 20 arc seconds, return to Berger for adjustment.
5.9 OPTICAL PLUMMET LINE OF SIGHT
1. Sight the optical plummet telescope at the target 1-1.5m/ 3-5' away.
2. Center the target in the optical plummets reticle.
3. Rotate the instrument 180°. 1/2 the difference to the target is the error.
4. Remove the reticle adjusting screw cover from the optical plummet and remove 1/2
the error. Repeat steps 1-4 until error is less than imm/ 1/32".
5.10 OPTICAL PEEPSIGHT TO TELESCOPE LINE OF SIGHT
1. Sight the telescope on a target 10m/ 30' away and align the vertical crosshair to the
target.
2. Sight through the optical peepsight. If the error is greater than 30 arc minutes, loosen
the (2) screws that hold the peepsight to the telescope and align it.
DGT10 PAGE 28 REV.A
6 MECHANICAL REPAIR AND REPLACEMENT
6.1 HORIZONTAL OR VERTICAL TANGENT/CLAMP SCREW
~orizontal
1. Unscrew the four screws that hold the display in
place.
2. Remove display. Mark electrical connector position
for proper re-insertion.
3. Turn the horizontal tangent screw counter-
clockwise as far as possible to remove the tension on
the tangent spring.
4. Unscrew the tangent spring housing. The tangent
spring is under pressure. Keep the piston and spring
with the tangent spring housing when removing from
the instrument.
5. Loosen the two set screws under the tangent
screw assembly. |
6. Remove the tangent screw.
Vertical
1. Remove the battery pack.
2. Remove five screws from the side cover at remove it.
3. Mark the electrical connector position for proper re-
insertion.
4. Turn the vertical tangent screw counter-clockwise as far
as possible to remove the tension on the tangent spring.
5. Unscrew the tangent spring housing. The tangent spring
is under pressure. Keep the piston and spring with the
tangent spring housing when removing it from the
instrument.
6. Loosen the set screw next to tangent screw assembly.
Remove the tangent screw assembly.
set screw
Re-assembly is in the reverse order of assembly.
DGT10 PAGE 29 REV.A
6.2 TELESCOPE DISASSEMBLY
1. Remove the diaphragm cover (1).
2. Remove the screw (2) from the eyepiece
assembly (3). Place the eyepiece in a clean
location.
3. Remove four screws (4) and take off the
diaphragm assembly and holder (5). Place the
diaphragm in a clean location.
4. Remove three screws (6) and pull off the
prism assembly (7). Place in a clean location.
5. Unscrew the focus sleeve (8).
6. Remove the focusing screw (9) and pull out
the focus slide (10). Place in a clean location.
7. To remove the objective lens (11), loosen the
set screws (12). The objective assembly will now
unscrew from the telescope tube (13).
6.3 VERTICAL AXIS REMOVAL AND REPLACEMENT
1. Remove five screws (1) and remove the left side cover (2).
2. Remove four screws (3) and remove the
primary circuit board (4). Mark the position
and location of all connection while
dismantling. Place in a static-free location.
3. Remove four screws (5) from the
secondary circuit board (6) and remove it.
Mark the position and location of all
connections while dismantling. Place in a
static-free location.
4. Remove four screws (7) from each of the
displays (8) and remove. Mark the position
and location of all connections while
dismantling. Place in a static-free location.
5. Remove the horizontal tangent/clamp
screw (9) as shown in section 6.1.
6. Remove two screws (10) from the center
cover (11) and remove.
7. Remove three screws (12) from the center
spindle (not shown) and carefully pull the
upper section of the instrument away from
the base. Watch that all the wire connections
are free when disassembling.
DGT10 PAGE 30 REV.A
Note: Once exposed, the encoder disks and detector are easily damaged. Take great
cautions in protecting these parts.
8. Remove three screws (16) from the window |
assembly (15) and remove. 23 24 22 21
9. Unscrew the center nut and remove the
washers (18,19,20) from the bottom.
10. Mark the position of the detector (21) on the
encoder disk. This will help later when checking
the signal. Only a small amount of positional
adjustment may be necessary. Remove the two
screws (22) from the encoder disk and remove the
detector assembly (21).
11. Use extreme care when performing this step.
The spacing between the two glass discs is very
small. Do not force any parts during removal. Do
not turn the vertical spindle (23) if the glass discs
are touching each other. This will scratch the , — 17
discs. SZ — 45
Remove the vertical spindle (23), upper (24) and
lower encoder disk (25) from the level base. Catch 16
the twenty-three bearing balls (27) as they fall
through the leve! base.
Re-assembly notes
Basically, assembly is the reverse order of disassembly, but with the following points of
caution.
1. Make sure that the glass disks are clean before assembly.
2. After lightly oiling the vertical spindle (23), slide the spindle into the level base, turning
as you go, about half way down. Do not force the parts together.
3. Insert the bearing balls between the center and base and slowly let the vertical center
spindle slide all the way into the base. Make sure that the two glass disks do not touch
when the center spindle is fully seated in the base. Carefully turn the center spindle to
assure that there is a gap between the two disks. The space between the disks should
be .0008-.0012" (.02/.03mm).
4. When mounting the detector, its exact position must be determined using the
oscilloscope. For now, line up the detector as close to its original position as possible.
5. Once assembled, the electronic system should be tested completely.
DGT10 PAGE 31 REV.A
6.4 HORIZONTAL AXIS REMOVAL AND REPLACEMENT
1. Remove five screws (1) and remove the left
side cover (2).
2. Remove four screws (3) and remove the
primary circuit board (4). Mark the position and : e
location of all connection while dismantling.
Place in a static-free location. >
3. Remove four screws (5) from the secondary я
circuit board (6) and remove it. Mark the ' ©
position and location of all connections while
dismantling. Place in a static-free location.
DC
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— | — 6
4. Remove the battery pack.
5. Remove five screws from the side cover at
remove it. |
6. Mark the electrical connector position for proper
re-insertion.
7. Turn the vertical tangent screw counter-
clockwise as far as possible to remove the tension
on the tangent spring.
8. Unscrew the tangent spring housing. The
tangent spring is under pressure. Keep the piston
and spring with the tangent spring housing when
removing from the instrument.
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DGT10 PAGE 32 REV.A
9. Remove three screws and washers
(1) from the rotating vertical circle. Mark
the circles position relative to the
telescope.
0. There is a hole in the outer circle.
Gently rotate the circle until you see the
screws underneath. remove the four
screws (2) with the smaller heads only.
Remove them one at a time to prevent
the outer circle from binding against the
previously loosened screws.
11. Remove the four screws (3) holding
the vertical detector assembly. Very
gently pull out on the entire assembly
while turning the telescope.
12. Remove the telescope clamp
retainer ring (4) and telescope clamp
(5). Keep the three wedge pieces in
order and with the clamp.
13. Loosen the two plumb adjusting
screws slightly. Remove the four
screws (7) holding the plumb adjusting
plate (6) in place and remove the plate.
14. Remove the two side plate screws
(8) and remove the side plate (9).
Carefully tilt the telescope sideways,
small axis bearing up, and remove the
telescope from the alidade.
15. Refer to section 6.2 for instructions
on disassembly of the telescope.
DGT10 PAGE 33 REV.A
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