TD-4 shows unprecedented cost performance with high accuracy and high resolving power (0.01° as smallest unit of display).
With its built-in memory, a data collector is no longer necessary.
TD-4 is a digital balloon theodolite which traces a pilot balloon in the air, and through elevation and azimuth data informs the user the conditions in the upper atmosphere.
With a built-in memory function, the TD-4 can store up to 20,000 measurement data.
The traditional data collector is no longer necessary, and the user can check stored data on the display of TD-4. Also, with the optional printer, the user can print out data real time.
Or, the user can connect a computer to TD-4's RS-232C interface to analyze data from TD-4 with the computer.
Compact, lightweight(5.2kg), and with high accuracy (smallest unit of display is 0.01° for both azimuth and elevation), TD-4 is about half in weight and five times the accuracy compared to TD-3, our previous model.
| Main telescope | ||
| Diameter | 47mm |  |
| Magnification | 18X | |
| Image | Inverted | |
| Field of view | 2°30' | |
| Resolution | 3.5" | |
| Sub telescope | ||
| Diameter | 16mm | |
| Magnification | 4X | |
| Image |
Inverted | |
| Field of view | 11° | |
| Resolution | 12" | |
| Digital Angle Display | ||
| Azimuth | 0-360° | |
| Elevation | 0-360° | |
| Smallest unit | 0.01° (for both azimuth and elevation) |
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| Display |
LCD(16 digits, 2 lines) | |
| Functions | ||
| Clock function |
Built-in real-time clock Calendar function |
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| Timer | 1-99 seconds | |
| Command and alarm | Buzzing |
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| Input of measurement error | Push button | |
| Azimuth set function | Key input (dialogue) | |
| External input/output function | RS-232C | |
| Operating time | Approx. 20 hours continuous | |
| Level vial | ||
| Sensitivity | 90"/2mm | |
| Dimensions / weight | ||
| Body | 192(W)x240(D)x270(H)mm 5.2kg | |
| Case | 465(W)x220(D)x305(H)mm 4kg | |
| Tripod(metal) | 1700mm(when fully expanded) 1030mm(when fully contracted) 4kg |
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| Power | ||
| Main power | Lithium ion battery(rechargeable) | |
| Backup memory | Lithium battery | |
| Accessories | ||
| Hood | 1 piece | |
| Eyepiece filters | 1 piece(switch between colors by rotating) | |
| Tubular compass | 1 piece | |
| Level vial adjusting pin | 1 piece | |
| Earphone for buzzer | 1 piece | |
| Tripod | 1 piece | |
| Battery charger(100-240V) | 1 piece | |
| Carrying case | 1 piece | |
| Instruction manual | 1 piece | |
| Optional items | ||
| Printer | Thermal head, 16 digits 80(W)x120(D)x60(H)mm 500g comes with a connection cable |
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| Software for TD-4 | ||
| RS-232C cable | For PC | |
| Chart paper | 10 rolls per set | |
| With the optional printer, data can be printed out at real time. | |
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TD-4's Data-processing Software Using TD-4's data-processing software, the user can make graphs showing relationships between "altitude and wind direction" and "altitude and wind speed" as well as graphs showing the path of pilot balloon. |
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