Bio-Rad Gel Doc™ XR+ System - Manual (Page 20)

Page 20 of 42
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).
Camera Lens and Filters
The MZL functions are operated from the membrane touch pad or through the acquisition
window in the software. To control the lens through the Quantity One
 acquisition window,
it is necessary to connect the Universal Hood II with a null modem cable (serial cable) from
the COM1 port on your computer to the serial port of the hood itself. A serial cable is
supplied with each instrument. If the only port present is the USB port then it is necessary to
use a USB To Serial converter (Part # 170-8009) for PC and for Mac (all Mac systems ship
with a converter).
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 decreasing the amount of light
coming into the sensor, thereby making the image darker. The other button, Open (+), opens
the aperture increasing 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. It allows 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