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Foreword
Thank you for purchasing the TOPCON Automatic Tracking Total Station, AP-L1A
series. For the best performance of the instruments, please carefully read these
instructions and keep them in a convenient location for future reference.
Prism constant value
Input the offset compensation value according to the prism constant value to be used.
Precaution is needed when using Pin-pole prism set L1 type, Pin-pole prism holder L1 type,
Prism unit A2 type, or a prism other than Topcon's. Each prism constant value is potentially
different.
Please refer to Chapter 10 "Setting the prism constant value".
On tripod
When mounting the instrument on the tripod, use a wooden tripod when possible. If you use a
metallic tripod, vibration may occur or measuring precision may be effected. Screws on each leg
of the tripod must be tightened firmly.
On tribrach
If tribrach is not installed correctly, measuring precision may be effected. Occasionally check
adjusting screws of the tribrach . Lock the base fixing lever, and tighten the Base Fixing Screw.
Guarding the instrument against shocks
When transporting the instrument, provide some protection to minimize risk of shocks. Heavy
shocks may cause the measurement to be faulty.
Carrying the instrument
When carrying the instrument at the site, always grip its handgrip.
Do not expose the instrument directly to the sunlight
Never leave the instrument in extreme heat (+122 degrees F) longer than necessary. It could
adversely affect its performance. Never expose the instrument's objective lens to direct sunlight
without a filter. It may damage the components inside the instrument.
Sudden changes of temperature
Any sudden change of temperature to the instrument or prism may result in a reduction of measuring
distance range, i.e when taking the instrument out from a heated vehicle. Let instrument acclimate
itself to ambient temperature.
General Handlin
Precautions
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