User`s guide

ARRICAM Accessories Quick Guide 01/2004, Page 8 of 24
Automatic versus manual speed ramps
An automatic speed ramp is a function where the start frame rate (FPS 1), duration of change (TIME) and end
frame rate (FPS 2) are preset. With the camera running, press the RAMP button to trigger the change from
FPS 1 to FPS 2, the duration of which is set by the TIME selectors. Press the RAMP button again at any time to
start the ramp back to FPS 1. Manual ramps can be performed by using the Speed Control Box together with
the Manual Control Box. During a manual ramp the camera speed or shutter angle is changed by with the
handwheel on the Manual Control Box.
Note: Holding the RAMP button depressed while the camera is in Standby will cause the FPS and SHUTTER
displays to alternately show the minimum ramp time (MinTime) achievable and screen time (ScrTime) of the
currently set automatic ramp. Screen time is calculated based on 24 fps playback speed.
Note: The Wireless Remote Control (WRC-1) can also be used to perform automatic or manual ramps.
Note: The MANUAL CONTROL switch on the MCB needs to be OFF for the automatic ramps described below to work.
Automatic speed/shutter ramps
When selecting shutter compensation, the camera will automatically pair the highest frame rate with a 180°
shutter angle, and calculate the required shutter angles to maintain constant film exposure.
• On the SCB set the SPEED CONTROL switch to ON.
• On the SCB set the COMPENSATION switch to SHUTTER.
• Enter the start frame rate with FPS 1, the duration with TIME and the ending frame rate with the FPS 2 selector switches.
• Once the RAMP LED is green, start the camera.
Note: If the FPS 1, TIME or FPS 2 LEDs flash red, the fps or time value set is too high or too low. If the COMPEN-
SATION LED glows red, the fps range is too wide for the shutter range of 11.2° to 180°. Reduce the fps range.
Automatic speed/iris ramps with LDS lenses
To compensate a speed ramp with the iris, these additional components are required: a Lens Data Box (LDB),
an LDS Lens and a CLM motor. In performing a speed ramp with iris compensation, the iris is controlled by the
OPEN/CLOSE buttons on the SCB – if the Wireless Focus Unit is used, its iris control is overridden.
• On the SCB, set the SPEED CONTROL switch to ON.
• Set the COMPENSATION switch to IRIS. The CAL LED on the SCB will flash yellow if the motor is not yet calibrated.
• Press the CAL button on the SCB to calibrate the lens motor if necessary.
• Enter the start frame rate of the ramp with the FPS 1, the duration with the TIME and the end frame rate with
the FPS 2 selector switches.
• Use the OPEN and CLOSE buttons to set the start T-stop (the iris you want for FPS 1). The camera will
automatically calculate the required iris opening to maintain constant film exposure while ramping.
• Once the RAMP LED is green, start the camera.
Note: If the FPS 1, TIME or FPS 2 LEDs flash red, the fps or time value set is too high or too low. If the
COMPENSATION LED glows red, the iris cannot compensate for the preset fps range. Either try changing the
current iris with the OPEN and CLOSE buttons, or try reducing the fps range.
Automatic speed/iris ramps with non-LDS lenses
Speed/iris ramps with non-LDS lenses can be achieved by means of the ARRI Iris Control Unit (ICU) and an
ARRICAM ICU Cable (KC 72-S (1m/3ft); yellow to CAC, white to ICU) in combination with a CLM-1 motor. If
using a CLM-2 motor, the Lens Data Box is also necessary.
Note: The COMPENSATION switch on the SCB must be set to OFF.
Instead of the SCB, the Wireless Remote Control (WRC-1) can be used. A CLM-1 or CLM-2 motor has to be
connected to the Lens Data Box. The WRC needs software V1.08 or later.
Speed Control Box - Ramps