BNC 1201 - 6 1/2 Digit Digital Multimeter User Manual
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line voltage setting. Configured for line voltages of 100/220V or
120/240V. (Depend on the power utility in your area.)
6. Option Slot: Designed for installing an optional multi-point scanner
card (Model: 1201-opt01).
7. Option GPIB/IEEE488 Connection: Connects a remote computer
with an IEEE488 cable for changing operation environment instead of
the front panel control (Model: 1201-opt04).