Bio-Rad Gel Doc™ XR+ System - Manual (Page 34)

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The Hold key disables the automatic shut-off of the UV and White light transilluminators and the epi
illumination; the lights will remain active until the hold status is cancelled. When the Hold key is pressed,
the orange LED will light up, indicating that the Hold function is active.
If opening the door or drawer (activating the UV interlock, which turns off the UV), you will need to turn
off the Hold button before pressing any other switch. The control panel has a second section that includes
the buttons to run all the MZL functions (see the Lens Control Section below).
Lens Control
The membrane pad has a Fast and a Slow button to obtain rapid or fine adjustments of the lens. An image
can be optimized with the following lens adjustments:
Aperture
is adjusted using the Iris buttons on the membrane touch pad. The size of the aperture opening
allows the CCD sensor to take in more or less light. The Iris has two buttons. One button, Close (-), reduces
the size of the aperture and decreases the amount of light coming into the sensor, thereby making the image
darker. The other button, Open (+), opens the aperture and increases the amount of light coming into the
sensor, resulting in a brighter image.
Focus is adjusted using the Focus buttons on the keypad. Pushing the Near (+) button or the Far (-) button
changes the focal point of the lens and allows the user to focus on the sample.
Zoom is adjusted using the Zoom buttons on the keypad. These buttons allow you to change the size of the
image on the screen. Pushing the Wide (-) button zooms out (far field). Pushing the Tele (+) button zooms
in (close up).
Membrane touch pad – Lens control section