SHIMPO DT-315P - Manual (Page 4)

3. SETTER DIAL
The setter dial changes the flashing rate.
External dial ---- used for coarse adjustment:
clockwise for increasing rate.
counter-clockwise for decreasing rate.
The setter returns to mid-position.
Internal dial ---- used for fine tuning:
One turn of the dial will change 10 digits in the
display.
4. x2 SWITCH
In the internal mode, every time the x2 button is depressed, the
flashing rate is doubled.
5. ÷2 SWITCH
In the internal mode, every time the /2 button is depressed, the
flashing rate is decrease by half.
6. PLUS SHIFT SWITCH
When the object appears to be standing still, pressing this button will
give the illusion that the object is moving toward the rotating direction
at a speed of 1 rotation in 6 seconds.
7. MINUS SHIFT SWITCH
When the object appears to be standing still, pressing this button will
give the illusion that the object is moving in reverse of the rotating
direction at a speed of 1 rotation in 6 seconds.