Sokkia 30R Series Operator's Manual page 164

27. STANDARD EQUIPMENT AND OPTIONAL ACCESSORIES
External power supply equipment
• When using EDC14, EDC2A, or BDC12, mount the BDC46A in place to
maintain the balance of the instrument.
• Make sure that the car cigarette lighter is 12V DC and that its negative terminal
is grounded. Use it with the car engine running.
• The EDC14 has a breaker switch. Normally the red mark appears on the
breaker. If it cannot be seen, set the breaker so it is visible.
When using the car battery, the breaker will cut off if the poles are not correctly
connected.
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