Pentax Switch ETH 302 User Manual

Total Construction Solutions  
Electronic  
Instruction manual  
Theodolites  
2 sec. Angle Accuracy  
ETH-302  
Detachable Tribrach  
5 sec. Angle Accuracy  
Detachable Tribrach  
ETH-305  
10 sec. Angle Accuracy  
Detachable Tribrach  
ETH-310  
20 sec. Angle Accuracy  
Detachable Tribrach  
ETH-320  
PENTAX Industrial Instruments Co., Ltd.  
2-5-2 Higashi-Oizumi / Nerima-ku,Tokyo 178-0063, Japan  
Tel. +81-3-5905-1222 / Fax +81-3-5905-1225  
E-mail: international@piic.pentax.co.jp  
 
Safety Precautions (must be followed)  
The following items are intended to prevent possible injury to the user or  
other people and/or damage to the instrument before it occurs.  
These safety precautions are important to the safe operation of this  
product and should be observed at all times.  
Distinctive Displays  
The following displays are used to distinguish precautions by the  
degree of injury of damage that may result if the precaution is ignored.  
WARNING  
Items indicated by this display are precautions which if ignored could  
result in death or serious injury.  
CAUTION  
Items indicated by this display are precautions which if ignored may  
result injury or material damage.  
Here ”injury” refers to injuries such as cuts, burns or electric shock  
the treatment of which will not likely require hospitalization or  
long-term attention.  
”Material damage” refers to the damage to facilities, buildings,  
acquired data, etc.  
WARNING  
Never look at the sun through the telescope as this may result in loss of  
sight.  
Do not use at a place near flammable materials as there will be a risk of  
fire or injury by explosion.  
3
 
CAUTION  
Secure the handle of main unit with the handle locking screws.  
Failure to properly secure the handle could result in the main unit  
detaching from the handle while being carried, causing injury.  
Do not use the carrying case as a footstool as it is slippery and  
unstable and may cause you to fall, resulting in possible injury.  
When mounting the instrument to the tripod, tighten the center  
screw securely. Failure to tighten the screw properly could result  
in the instrument falling off the tripod causing injury.  
Securely tighten the leg fixing screws of the tripod. A person  
could be injured by the tripod shoes on an extending leg due  
to a loose screw.  
Do not carry a tripod with the metal shoe pointing toward another  
person as the person may be injured if they strike them.  
Make sure that your hands and feet are not in the vicinity of  
the tripod legs when setting up the tripod, or a hand or foot stab  
would occur.  
Do not wield or throw the plumb bob. A person could be  
injured if struck.  
If a battery box or a battery is gets wet by water, wipe off the  
water and dry immediately.  
When a battery box is removed from the unit, power must be off.  
If the battery box is removed with power on, it will cause trouble.  
Electro-Magnetic Compatibility(EMC)  
This instrument complies with the protection requirement for  
residential and commercial areas.  
If this instrument is used close to industrial areas or transmitters,  
the equipment can be influenced by electromagnetic fields.  
4
 
CONTENTS  
• 1.  
1.1  
General  
Precautions  
7
1.2  
1.3  
1.4  
Standard equipment  
Names of Parts  
Preparation of power  
Key Operations and Display  
Display  
• 2.  
14  
2.1  
2.2  
2.3  
Keyboard  
Function of each key  
2.3.1 Power on-off key  
2.3.2 V/% key  
2.3.3 Hold key  
2.3.4 0 set key  
2.3.5 R/L key  
2.3.6 Illumination key  
2.4  
Other functions  
2.4.1 Remaining battery indicator  
• 3.  
Special Key Operations  
Setting of vertical angle  
Setting of 90°buzzer  
22  
28  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
Setting of correction of vertical angle  
Setting of angle measurement  
Setting of automatic power-off function  
Setting of Angle unit  
Preparation for Surveying  
Setting up the instrument  
Leveling with the circular vial  
Leveling with the plate vial  
Centering with the optical plummet  
Eyepiece adjustment  
• 4.  
4.1  
4.2  
4.3  
4.4  
4.5  
4.6  
Object sighting  
5
 
CONTENTS  
• 5.  
5.1  
5.2  
5.3  
Measurement  
34  
37  
Horizontal angle measurement (right)  
Horizontal angle measurement (left)  
Vertical angle measurement  
• 6.  
Inspection and Adjustment  
6.1  
6.2  
6.3  
6.4  
6.5  
6.6  
6.7  
Instructions on inspection and adjustment  
Perpendicularity of plate vial to vertical axis  
Perpendicularity of circular vial to vertical axis  
Inclination of reticule graduations  
Perpendicularity of line of sight to horizontal axis  
Difference of the vertical angle  
Optical plummet  
• 7.  
7.1  
• 8.  
Optional Accessories  
Diagonal eyepiece  
Specifications  
44  
45  
6
 
1. General  
1.1 Precautions  
Storing and environmental conditions  
Do not use the instrument until it has adjusted to  
the ambient temperature.  
Avoid using at a high or low temperature.  
The instrument may not work normally at  
temperatures exceeding –10 or +50˚C.  
When the instrument gets wet,  
wipe off the water immediately and let it completely dry  
outside of the case. Store in the case after completely dried.  
Be sure to store instrument in the case. Avoid storing in a place that is  
subject to high temperature, high humidity, or dust.  
When not in use for extended periods, remove a battery from the  
battery box. Also remove the instrument from the case and expose  
to the air periodically.  
Battery  
Batteries can naturally discharge due to shipment time.  
Use new batteries for the first job.  
The four (4) batteries, in a battery box, should be of the same type.  
Do not use batteries, in a battery box, which have different remaining  
capacities.  
Do not touch the liquid of leaking batteries.  
7
 
Transportation  
Do not subject to impact or vibration during  
transportation.  
When transporting, handle the same as ”fragile” and  
pack the shipping case with cushioning materials.  
Inspection, Adjustment and Repair, Overhaul  
When not in use for extended periods of having been subjected to  
impact or vibration, be sure to check the instrument adjustments  
before using.  
If there is any problem in the instrument,  
do not attempt to repair or you may make  
the problem worse.  
Contact your local dealer for proper repair or instructions.  
8
 
Others  
When cleaning the case or the instrument, do not use any organic  
solvent. The surface of plastic parts may dissolve and deformation  
and discoloration can occur.  
Wipe off the dirt with a wet cloth of dilute household detergent  
Wipe off dirt on the optics with a cleaning cloth (or paper) specified  
for optical surfaces.  
To realize full capability of the instrument, adhere to  
cautions described in each chapter of this manual.  
1.2 Standard Equipment  
Body (with objective cap)  
Battery box (One battery box is installed in the instrument)  
Batteries* (Contained in the carrying case)  
A set of tools (Adjusting pin, driver)  
A plumb bob  
Rain cover  
Carrying case  
Instruction manual  
*
The standard equipment AA batteries can naturally discharge due to  
shipment time. Use new batteries for the first job.  
When disposing used batteries, please follow your municipal  
government rules.  
9
 
Unpacking and Storing  
Unpacking  
Gently set down the carrying case so that its cover is upward.  
Unlatch and open the case while pushing the latch lock.  
Take the instrument out of the case.  
Storing  
Set the telescope almost horizontal, and lightly tighten the telescope  
clamp screw.  
Align the containing marks*, and lightly tighten the horizontal clamp  
screw.  
Insert the instrument into the case with the containing marks*  
facing upward.  
Close the case lid and lock the latches.  
*
Containing mark = Yellow dot sticker  
10  
 
1.3 Names of Parts  
Handle  
Screw for handle  
Collimator  
Objective lens  
Instrument height mark  
(215mm)  
Optical plummet  
Leveling screw  
Bottom plate  
Tribrach locking lever  
11  
 
Eyepiece cap  
Eyepiece lens  
Battery box  
Telescope tangent screw  
Focusing knob  
Plate vial  
Telescope clamp screw  
Horizontal clamp screw  
Horizontal tangent screw  
Circular vial  
LCD panel  
Keyboard  
12  
 
1.4 Preparation of Power  
Remove battery box from the unit by pushing the release button on  
the top of the battery box. Remove the battery box cover.  
Insert four AA batteries into the battery box according to (+) and (-).  
Press the battery box to the leg by inserting the guide pin  
to the guide groove.  
Confirm the correct work by pressing the power switch.  
This instrument can operate using 1.2V AA rechargeable batteries.  
The four (4) batteries, in a battery box, should be of the same type.  
Do not use batteries, in a battery box, which have different remaining  
capacities.  
When a battery box or batteries are wet, wipe off the moisture  
immediately and dry completely.  
When a battery box is removed from the unit, power must be off.  
If the battery box is removed with power on, it will cause trouble.  
13  
 
2. Key Operations and Display  
2.1 Display  
Vertical angle  
V=Zenith 0°, V%=Slope(VH=Horizontal 0°, Vc=Compass)  
Horizontal angle Battery indicator:  
(HR=right rotation horizontal angle, HL=left rotation horizontal angle)  
2.2 Keyboard  
[V/%] key  
[R/L] key  
(Switches the display of vertical angle)  
(Set the horizontal angle right  
and left rotation alternately)  
[HOLD] key (Pressing twice holds the horizontal  
angle shown on the display)  
[0SET] key  
(Pressing twice resets the horizontal angle to 0°,00,00”)  
[
] Illumination key (Illuminate LCD panel and the telescope reticle)  
[ON/OFF] key (Turns the power on and off alternately)  
14  
 
2.3 Function of each key  
2.3.1 Power [ON/OFF] key  
1
<Power ON and set the vertical angle 0 point>  
Pressing the ON/OFF key turns on the power supply and the message  
”0 SET” is displayed. After the ”0 SET” of vertical angle is performed,  
the Horizontal and Vertical angle are displayed and the instrument  
enters into the angle measurement mode.  
2
<Setting vertical angle 0 point>  
Set the vertical angle 0 point by turning the telescope upward or  
downward when the instrument is at the ”normal” position  
(Vertical circle at left.)  
3
<Power OFF>  
To turn the power supply off, press the ON/OFF key for more than  
1 second (”OFF” will display) and then release it. Power turns OFF.  
15  
 
2.3.2 [V/%] key  
Pressing the V/% key will change the Vertical angle display to  
V%(slope). (At the shipping, it is set at Zenith 0°)  
By special key operation, horizontal 0° (VH) and Compass (Vc)  
can be set.  
(Factory default is Zenith 0°)  
(Refer to 3.1 Setting of vertical angle.)  
16  
 
The error ”OVER RANGE” is displayed when the telescope  
exceeds 45°(100%) in the V% display mode.  
17  
 
2.3.3 [HOLD] key  
1
Press the [HOLD] key twice in succession to hold the displayed  
horizontal angle and retain it. (Press once, the key buzzer will sound,  
then press again during the sound.)  
2
Press the key once more to release.  
To prevent operation error, the buzzer sounds for three seconds  
when the [HOLD] key is pressed.  
HOLD is not initiated unless the key is pressed during  
the buzzer sound.  
18  
 
2.3.4 [0SET] key  
1
Press the [0SET] key twice in succession to reset the displayed  
horizontal angle 0°,00,00. (Press once, the key buzzer will sound,  
then press again during the sound.)  
2
Press the key once more to release.  
To prevent operation error, the buzzer sounds for three seconds when  
the [OSET] key is pressed.  
[OSET] is not initiated unless the key is pressed during the buzzer  
sound.  
19  
 
2.3.5 [R/L] key  
Press the [R/L] key to change from clockwise to counterclockwise  
rotation. A clockwise or counterclockwise reading is alternately  
displayed each time the key is pressed.  
1
Clockwise horizontal angle  
Count horizontal angle in a right  
rotation direction (HR)  
2
Counterclockwise horizontal angle Count horizontal angle in a left  
rotation direction (HL)  
If the power turns off during the counterclockwise mode, the display  
returns to a clockwise horizontal angle display when power is turned on.  
2.3.6 [Illumination key  
]
Pressing the key, illuminates the LCD panel and telescope reticule.  
The illumination is automatically turned off after five minutes.  
Pressing the key, with illumination on, turns off the illumination.  
20  
 
2.4 Other Functions  
2.4.1 Remaining battery indicator  
The status of the remaining battery capacity is displayed with  
” symbolizing the battery capacity.  
Battery full - operating possible  
Operation possible  
Operation still possible  
Get the battery ready for a stand by  
Replace batteries  
Automatic Power-off function  
If there is no key operation for about 30 minutes, the power supply is  
turned off automatically.  
This function can be set to NIL by special key operation. (Refer to 3.5  
Setting of automatic power off function.)  
21  
 
3. Special key operations  
Special key operation enables selection of angle unit and  
other such items.  
1
Press [HOLD] key and [0SET] key at the same time  
2
Press [ON/OFF] key  
3
Release [ON/OFF] key  
4
(No display or buzzer)  
Release [HOLD] key and [0SET] key,  
5
Following display appears:  
22  
 
Flow of setting display  
Setting of vertical angle  
Press [R/L] key  
Setting of 90°buzzer  
Press [R/L] key  
Setting of correction of vertical angle  
Press [R/L] key  
Setting of angle display  
Press [R/L] key  
Setting of automatic power off function  
Press [R/L] key  
Setting of Angle unit  
Previous items can be displayed by pressing the [HOLD] key.  
23  
 
3.1 Setting of Vertical Angle  
Vertical angle setting display by special key operation  
Zenith 0° (V)  
Setting is switched by pressing [0SET] key  
Horizontal angle 0°(VH)  
Compass (Vc)  
Store with [V/%] key when the setting is decided.  
24  
 
3.2 Setting of 90°buzzer  
90°buzzer setting display by special key operation  
No 90°buzzer  
Setting is switched by pressing [0SET] key  
With 90°buzzer  
Store with [V/%] key when the setting decided.  
3.3 Setting of correction of vertical angle  
Correction of vertical angle setting display by special key operation  
Setting is switched by pressing [0SET] key  
Store with [V/%] key when the setting decided.  
25  
 
3.4 Setting of angle measurement  
Angle setting display by special key operation  
1
For models ETH-302/305  
Setting is switched by pressing [0SET] key  
Store with [V/%] key when the setting decided.  
2
For models ETH-310  
Setting is switched by pressing [0SET] key  
Store with [V/%] key when the setting decided.  
3
For ETH-320  
Setting is switched by pressing [0SET] key  
Store with [V/%] key when the setting decided.  
26  
 
3.5 Setting of automatic power off function  
Automatic power off function setting display by special key operation  
Automatic power off active  
Setting is switched by pressing [0SET] key  
Automatic power off inactive  
Store with [V/%] key when the setting decided.  
3.6 Setting of Angle unit  
Setting is switched by pressing [0SET] key  
You can Select DEG or DEC or GRD or MIL as the unit for angle.  
Store with [V/%] key when the setting decide.  
27  
 
4. Preparation for Surveying  
4.1 Setting up the instrument  
1
Adjust the tripod legs so that a height suitable for surveying is  
obtained when the instrument is set on the tripod.  
2
A Set the tripod and fix the metal shoe firmly into the ground so that  
the tripod head is as level as possible and centered above the station  
point. If the tripod head is disturbed by the action of fixing the metal  
shoe into the ground, correct the level by extending or retracting each  
leg of the tripod.  
3
Set the instrument on the tripod head; insert the tripod center screw  
into the instrument bottom plate and tighten firmly.  
Bottom plate  
Tripod head  
Center screw  
Tripod  
28  
 
4.2 Leveling with the Circular level  
After [4.1 Setting up the instrument] is completed, instrument must be  
leveled using the circular vial.  
1
By rotating any two leveling screws, position the bubble in the center  
of the vial (See A.) (To adjust the screws at the same time, turn them in  
opposite directions.)  
2
Adjust the remaining leveling screw, and position the bubble in the  
center of the circle (See B)  
For the relation between the screw adjusting direction and bubble  
moving direction, refer to the arrows of the following figures. Bubble will  
move to the right in figure A, while in figure B it moves upward.  
(A)  
(B)  
29  
 
4.3 Leveling with the Plate level  
After [4.2 Leveling with the circular vial] is completed, instrument must be  
leveled with plate vial.  
1
Place the plate vial in parallel with a line joining any two of the leveling  
screws. By rotating two leveling screws in the opposite direction of  
each other, position the bubble in the center of the vial (See A)  
2
Rotate the plate vial through 90°, position the bubble in the center of  
the vial by operating the remaining one leveling screw (See B)  
3
Confirm if the bubble stays in the center by rotating the  
instrument 180°.  
1
2
If the bubble moves, repeat procedure  
and  
.
For the relationship between the screw adjusting direction and bubble  
moving direction, refer to the arrows of following figures. Bubble will  
move to the left in figure A, while in figure B moves upward.  
When the bubble is not positioned in the center by repeating procedure  
1
2
and  
in procedure 4.2 , adjustment is required.  
(Refer to [6.Inspection and Adjustment.])  
Plate vial  
(A)  
(B)  
30  
 
4.4 Centering with the optical plummet  
After [4.3 Leveling with the plate vials] is completed, the instrument must  
be centered above the station point.  
1
Focus the optical plummet reticule by rotating the optical plummet  
eyepiece knob.  
2
Focus the station point by rotating the optical plummet focusing knob.  
3
Loosen the tripod center screw. Look through the optical plummet  
eyepiece, and move the instrument bottom plate until the reticule  
center coincides with the station point. (Take care not to rotate  
the instrument)  
4
Tighten the tripod center screw. Ascertain that the bubble stays  
positioned in the center when rotating the plate vial position in steps  
of 90°. If the bubble is not positioned in the center, adjust with the  
leveling screws. (Refer to [4.3 Leveling with the plate vial]).  
4
Even if the bubble is shifted by one graduation in  
, deviation of  
centering is just 0.3mm, at the instrument height of 1.4m, giving little  
effect on the survey result.  
Center mark  
31  
 
4.5 Eyepiece adjustment  
After [4.4 Centering with the optical plummet] completed, focus the  
telescope eyepiece on the telescope reticule.  
1
Remove the telescope lens cap.  
2
Point the telescope at a bright object.  
3
Rotate the eyepiece completely counterclockwise.  
4
Look through the eyepiece, and rotate the eyepiece clockwise until the  
reticule appears at its maximum sharpness.  
Vertical graduation  
(single)  
Reticule pattern  
Optical axis  
Vertical graduation  
(double)  
Horizontal graduation  
(double)  
4
At procedure , keep your eye relaxed to prevent parallax and eye  
fatigue. Parallax causes problems with object sighting.  
(Refer to [4.6 Object sighting])  
32  
 
4.6 Object sighting  
After [4.5 Eyepiece adjustment] is completed, sight the object.  
1
Loosen the telescope clamp screw and horizontal clamp screw.  
2
Point the telescope at the object using the collimator sight.  
3
Tighten the telescope clamp screw and horizontal clamp screw.  
4
Focus on the object by rotating the focusing ring, while looking  
through the telescope.  
5
Accurately align the reticule with the object, using each tangent  
screw.  
Collimator  
Focusing ring  
object  
Telescope eyepiece  
Horizontal clamp screw  
Horizontal tangent screw  
4
In procedure , focus on the object correctly so that the reticule  
will not move in relationship to the object when you move your eye  
slightly left and right, while looking through the eyepiece.  
Turn the focusing ring clockwise to focus on a near object.  
Turn the focusing ring counterclockwise to focus on a far object.  
Two screws of the collimator are fixed and adjusted at the distributor  
or the manufacturer. Do not move them arbitrarily.  
33  
 
5. Measurement  
5.1 Horizontal angle measurement (right)  
1
Level the instrument, and after power on set the vertical angle 0 point.  
2
Sight the first object using the horizontal clamp and tangent screw as  
well as the telescope clamp and tangent screw.  
3
Press [0SET] twice to set the horizontal angle to 0°,00,00”  
4
Sight the second object using the horizontal clamp and tangent screw  
as well as the telescope clamp and tangent screw.  
5
Read the displayed value (α).  
First Object: Zero Setting (0 °00’ 00”)  
Second Object (34 °47’ 20”)  
Horizontal Angle (α) = 34 °47’ 20”  
First object  
Second object  
34  
 
5.2 Horizontal angle measurement (left)  
1
Level the instrument, and after the power on set  
the vertical angle 0 point.  
2
Sight the first object using the horizontal clamp and tangent screw as  
well as screw as well as the telescope clamp and tangent screw.  
3
Press the [R/L] key to switch the horizontal angle display to  
counterclockwise reading (HL).  
Subsequent operation will be done as in [5.1 Horizontal angle  
measurement (right), but the order of collimation is reversed.  
To switch the mode back to ”right, press the [R/L] key again.  
If the power turns off during the counterclockwise mode, the display  
returns to a clockwise horizontal angle display when power is  
turned on.  
35  
 
5.3 Vertical angle measurement  
Level the instrument, turn the power on and set  
the vertical angle 0 point.  
Sight the object A using the horizontal clamp and tangent screws as well  
as the telescope clamp and tangent screws.  
Read the displayed value ( ).  
The vertical angle mode can be changed to slope percent display  
(V%) by pressing [V%] key.  
Also, horizontal 0°(VH) and compass (Vc) can be set using special  
key operation.  
(Factory setting is Zenith 0°)  
(Refer to 3.1 Setting of vertical angle)  
Vertical angle (θ) = 86 °24’ 40”  
Press the [V/%] key to view the Vv and V%.  
Vertical angle 0 point  
Object  
Horizontal angle  
36  
 
6. Inspection and Adjustment  
6.1 Instructions on inspection and adjustment  
Inspection and adjustment should be done after setting the  
instrument on a tripod or on an adjustment stand.  
Inspection should be done sequentially from [6.2 Plate vial] to  
[6.5 Perpendicularity of line of sight to horizontal axis]  
Adjustments should be finished with adjustment screws having been  
tightened and with firm torque. Do not finish by loosening an  
adjustment screw.  
Repeat inspection after adjustment and confirm if the adjustment is  
performed correctly.  
It is recommended that a trained professional perform adjustments,  
if possible.  
6.2 Perpendicularity of plate vial to vertical axis  
Inspection  
1
Perform [4.3 Leveling with the horizontal vial]  
2
Rotate the instrument through 90° and confirm if the bubble is  
always in the center.  
3
When the bubble is in the center, no adjustment is necessary.  
If the bubble moves from the center, following adjustment is required.  
Plate vial  
Leveling screw  
37  
 
Adjustment  
1
Center the plate vial bubble.  
2
Rotate the instrument 180°, move the bubble half way back to  
the center by operating a leveling screw which is located parallel  
with the plate vial.  
Rotate the vial adjusting screw with the adjusting pin and position  
3
the bubble in the center.  
4
Repeat procedure again to confirm.  
38  
 
6.3 Perpendicularity of circular vial to vertical axis  
Inspection  
1
Confirm if the bubble of the circular vial is in the center after  
the inspection and adjustment of [6.2 Plate vial].  
2
No adjustment is necessary if the bubble of the circular vial is  
in the center but if not, the following adjustment is required.  
Adjustment  
1
Move bubble to the center by rotating the bubble adjusting  
screws, using the adjusting pin.  
2
Inspect again.  
Circular vial  
Bubble adjusting screws  
39  
 
6.4 Inclination of reticule graduations  
Inspection  
1
Set an object point A on the line of sight through the telescope.  
2
Move point A to the edge of the field of view by adjusting the  
telescope tangent screw (point A’).  
3
No adjustment is necessary if point A moves along the vertical line of  
the reticule. If the point A does not move along the vertical line of the  
reticule, it needs adjustment - Consult with your dealer.  
Line of sight axis  
Vertical line  
A'  
40  
 
6.5 Perpendicularity of line of sight to horizontal axis  
Inspection  
1
Set an object (point A) at a distance of 30 to 50m away from the  
instrument and sight it through the telescope.  
2
Loosen the telescope clamp screw and reverse the telescope around  
the horizontal axis. Mark a point set on the line of sight at about the  
same distance to the object point A, and call it point B.  
3
Loosen the horizontal clamp screw, and rotate the instrument around  
the vertical axis. Sight point A again.  
4
Loosen the telescope clamp screw, and reverse the telescope around  
the horizontal axis. Mark a point on the line of sight at about the same  
distance as point B, and call it point C.  
5
No adjustment is necessary if point B and C coincide,  
but if it does not - Consult with your dealer.  
41  
 
6.6 Difference of the vertical angle  
Inspection  
1
Set the vertical angle in Zenith 0° mode  
2
Sight an object (Point P) with the telescope and read the vertical  
angle (V correct).  
3
Reverse the telescope and rotate the alidade.  
4
Sight point P again in the reverse position and  
read the vertical angle (V reverse).  
5
At this time, when (V correct + V reverse - 360°)/2 is less than 15,  
it is within tolerance. If it shows a larger value,  
it needs adjustment - Consult your dealer.  
42  
 
6.7 Optical plummet  
Inspection  
1
Place a piece of white paper, with a cross drawn on it, directly under  
the instrument.  
2
Look through the optical plummet, and move the paper so that the  
intersecting point of the cross comes to the center of the field of view.  
3
Adjust the leveling screws so that the center mark of the optical  
plummet coincides with the intersection point of the cross.  
4
Rotate the instrument around the vertical axis. Look through the  
optical plummet each step of 90° rotation, and observe the center  
mark position against the intersection point of the cross.  
5
If the center mark always coincides with the intersection point, no  
adjustment is necessary. When it does not coincide, the following  
adjustments are required.  
Point  
Center mark  
Adjustment  
1
Remove the cover of the optical plummet.  
2
Mark the point set on the line of sight at each step of 90° on the  
white paper and call them A,B, C and D.  
3
Join the opposed points (A, C and B, D) with a straight line, and set  
intersecting point 0.  
4
Turn four optical plummet adjusting screws with the adjusting pin so  
that the center mark coincides with the intersection point 0.  
5
Repeat procedure again to confirm.  
Optical plummet adjusting screw  
Adjusting pin for the center mark  
Cap of optical plummet  
43  
 
7. Optional Accessories  
7.1 Diagonal Eyepiece (SB14)  
The Diagonal eyepiece can be attached to the telescope for convenience  
in observing the zenith or when in confined spaces.  
<Installation>  
1
Turn the telescope eyepiece ring counterclockwise to remove  
the eyepiece.  
Be sure to hold the eyepiece, securely, so that you do not drop it.  
Attach the diagonal eyepiece to the telescope by reversing  
the procedure.  
The diagonal eyepiece can be rotated through 360°.  
When sighting through the telescope with the diagonal eyepiece  
attached, the reticule may be seen deflected vertically or horizontally,  
but this has no influence upon accuracy.  
44  
 
8. Specifications  
Telescope  
Magnification  
Effective aperture  
Resolving power  
Field of view  
30 X  
45 mm  
3”  
1° 30’  
Minimum focus distance 1.35 m  
Stadia ratio  
Stadia constant  
100  
0
Angle Measurement  
Type  
Incremental rotary encoder  
Detection mode  
V. angle:  
H. angle:  
Single  
Dual  
Minimum Display (Selectable)  
ETH-302 1”/5”  
ETH-305 1”/5”  
ETH-310 5”/10”  
ETH-320 10”/20”  
Accuracy (DIN18723, Standard deviation)  
ETH-302 2”  
ETH-305 5”  
ETH-310 10”  
ETH-320 20”  
Vertical Angle Compensation  
Method  
Automatic compensation  
Stadia Ratio  
Stadia Constant  
100  
0
Display  
Type  
Display panel  
Dot matrix LCD/Two lines  
Dual display  
45  
 
Vertical axis  
Single  
Sensitivity of vials  
Plate vial  
ETH-302  
ETH-305  
ETH-310  
ETH-320  
30”/2 mm  
30”/2 mm  
40”/2 mm  
40”/2 mm  
Circular vial  
8’  
Tribrach type  
Detachable  
Optical plummet  
Magnification  
3 x  
Focusing range  
0.5 m to Infinity  
Power source  
Type  
Operation time (Alkaline)  
4 x AA dry battery  
25 to 28 hrs.  
(NiMH2300mAh) 25 to 28 hrs.  
Water resistant  
IP x4  
Ambient temperature  
- 10 °C to + 50 °C  
Height  
215 mm  
Dimensions  
Instrument (including batteries) W168 x H330 x L158mm/4.6kg  
46  
 
 
PENTAX Industrial Instruments Co., Ltd.  
2-5-2 Higashi-Oizumi  
Nerima-ku,Tokyo 178-0063, Japan  
Tel.: +81-3-5905-1222  
Fax: + 81-3-5905-1225  
E-mail: international@piic.pentax.co.jp  
certified  
The CE marking assures that  
this product complies with  
the requirements of the EC  
directive for safety.  
Member symbol of the Japan Surveying  
Instruments Manufacturers’ Association  
representing the high quality surveying  
products.  
 

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