Topcon GPT-3000 Series, Instruction Manual

Page: 20 / 180

1-9
1 NOMENCLATURE AND FUNCTIONS
●
Tilt correction
The tilt setting mode performed here will not be memorized after powering OFF. To set TILT
correction in the initialized setting (it is memorized after powering OFF), see Section 6.4.3 “Vertical
and Horizontal Angle Tilt correction ( Tilt ON/OFF)” .
●
Point guide
Fast and simple to use, the Point Guide feature is useful when doing stake out work. The LED’s for
the Point Guide System on the instrument telescope assist the rod person to get on-line. When
using the Point Guide System, the battery life will be approximately 8 hours at +20
°
C (+68
°
F).
Turning the Point Guide ON and Operation:
Once you have determined that both of the LED's are equally bright, you are on-line with the
instrument.
Turning the Point Guide OFF:
To turn OFF the Point Guide System, press the [F3] key again.
●
Set audio mode
The light acceptance quantity level (Signal level) is displayed in this mode.
When reflected light from the prism is received, a buzzer sounds. This function is good for easy
collimation when the target is difficult to find.
Press the [F4] key to view the set audio screen.
(1) To stop the buzzer, refer to Chapter 16 “ SELECTING MODE”.
(2) Also, it is possible to display the signal level in Distance Measuring Mode.
The temperature, pressure, PPM, PSM and NPM can be viewed in set audio mode.
Refer to Chapter 10 “SET AUDIO MODE”, Chapter 11 “SETTING THE PRISM / NON-PRISM
CONSTANT VALUE” and Chapter 12 “ SETTING ATMOSPHERIC CORRECTION”, for further
instructions.
Press the [F3] key to turn ON the Point Guide LEDs.
Looking at the objective lens of the telescope, the right
LED will blink and the left LED will stay lit.
The Point Guide should be used within a distance of 100
meters (328 feet). The quality of its results will depend on
the weather conditions and the user
’
s eyesight.
The goal of the rod person is to look at both LED
’
s on the
instrument and move the prism on-line until both LED
’
s
are equally bright.
5If the solid LED is brighter, move right.
If the blinking LED is brighter, move left.
Instrument
Illuminate
Blink
Prism