Bio-Rad GS-800™ Calibrated Densitometer - Manual (Page 14)

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Calibration Tablet Areas/Calibration Windows
The GS-800 Densitometer is equipped with reflectance and transmission step wedges.
The transmission step wedge is located on the (right hand side of the image window). The
reflectance step wedge is internal. When you scan a transparent sample, place the sample
on the Densitometer's image window Do not cover the calibration windows (Figure 4.2) or
a calibration error will occur.
Validation and Documentation of the calibration performance can be accomplished by
using the following GS-800 IQ/OQ Protocols.
“1.2 Installation Qualification and Operational Qualification (IQ/OQ)
The calibration of the Model GS-800 Calibrated Imaging Densitometer can be validated by
following the GS-800 Calibrated Densitometer Installation Qualification and Operational
Qualification protocols. These protocols are available as an accessory to the GS-800
calibrated Imaging Densitometer ( Catalog number 170-7956) these straightforward and
simple to follow IQ/OQ protocols include instructions for the installation of the hardware
and software, and instructions for the verification of the reflectance and transmittance
calibration functions.
Following proper installation, a linear dynamic range of 3.0 OD for the
Transmissive scanning and 2.0 OD for Reflectance scanning can be confirmed with
greater than 95% confidence. For additional details, contact your local Bio-Rad
Representative.”
Bezel
The bezel (Figure 4.2) is the raised frame around the image window. It has marks in
inches and centimeters to help you correctly position the sample on the image window for
scanning.
Indicator Lights
The indicator lights (Figure 2.2) are located on the front left side of the Model GS-800
Calibrated Imaging Densitometer cabinet. This panel consists of two lights that indicate
the status of the unit.
Light Description
Power Indicator Is lit when the power switch is in the on position (green light).
Ready Indicator Flashes during self-test(start-up) and during scans (green light).
Calibration Strip Values
The OD values of the built in Calibration Strip can be found either on the decal posted on
the side of the GS-800 (see below) or on the enclosed OD value sheet .